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<h3>
Ömer Sinan Ağacan pushed to branch wip/T16992
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b8dc36653878de5556e368bd3e93abf66f839e9">8b8dc366</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-11-25T14:37:38+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove prefix arrow support for GADTs (#17211)
This reverts the change in #9096.
The specialcasing done for prefix (->) is brittle and
does not support VTA, type families, type synonyms etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a08f7d405bbedfdc20c07f64726899f594e9d07">5a08f7d4</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-27T00:14:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make warnings for TH splices opt-in
In #17270 we have the pattern-match checker emit incorrect warnings. The
reason for that behavior is ultimately an inconsistency in whether we
treat TH splices as written by the user (`FromSource :: Origin`) or as
generated code (`Generated`). This was first reported in #14838.
The current solution is to TH splices as `Generated` by default and only
treat them as `FromSource` when the user requests so
(-fenable-th-splice-warnings). There are multiple reasons for opt-in
rather than opt-out:
* It's not clear that the user that compiles a splice is the author of the code
that produces the warning. Think of the situation where she just splices in
code from a third-party library that produces incomplete pattern matches.
In this scenario, the user isn't even able to fix that warning.
* Gathering information for producing the warnings (pattern-match check
warnings in particular) is costly. There's no point in doing so if the user
is not interested in those warnings.
Fixes #17270, but not #14838, because the proper solution needs a GHC
proposal extending the TH AST syntax.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8168b42a95ddf37c56958955eef065eb8747470f">8168b42a</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-27T11:32:18+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Whitespace-sensitive bang patterns (#1087, #17162)
This patch implements a part of GHC Proposal #229 that covers five
operators:
* the bang operator (!)
* the tilde operator (~)
* the at operator (@)
* the dollar operator ($)
* the double dollar operator ($$)
Based on surrounding whitespace, these operators are disambiguated into
bang patterns, lazy patterns, strictness annotations, type
applications, splices, and typed splices.
This patch doesn't cover the (-) operator or the -Woperator-whitespace
warning, which are left as future work.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e5477c46bbcd3beadd1a67a294056628e394945">9e5477c4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-27T20:01:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix @since annotations for isResourceVanishedError and friends (#17488)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e122ba33e8426a7b7f18216c451f6288e90c966e">e122ba33</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-11-27T20:02:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitmodules: tweak 'exception' URL to avoid redirection warnings
Avoid initial close warning of form:
```
Cloning into 'exceptions'...
warning: redirecting to https://gitlab.haskell.org/ghc/packages/exceptions.git/
```
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f84b52a9c439ae2739bf1899a2adbae9c6d4f67">5f84b52a</a></strong>
<div>
<span>by Philipp Krüger</span>
<i>at 2019-11-28T02:54:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reduce boolean blindness in OccInfo(OneOcc) #17482
* Transformed the type aliases `InterestingCxt`, `InsideLam` and `OneBranch`
into data types.
* Added Semigroup and Monoid instances for use in orOccInfo in OccurAnal.hs
* Simplified some usage sites by using pattern matching instead of boolean algebra.
Metric Increase:
T12150
This increase was on a Mac-build of exactly 1%. This commit does *not* re-intruduce
the asymptotic memory usage described in T12150.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3748ba3a01f81078025b86023833784055d1af57">3748ba3a</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-28T02:54:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos, using Wikipedia list of common typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c59cc71dc20f26d5a6650b16a82faeae72f2065">6c59cc71</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-28T02:55:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix endian handling of LLVM backend
Get rid of CPP macro WORDS_BIGENDIAN which is not defined anymore, and
replace it by DynFlag. This fixes partially #17337.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6985e0fc4f6fb30c1effd356d87c1a0629aa9cd0">6985e0fc</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-28T15:47:53+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out HsSCC/HsCoreAnn/HsTickPragma into HsPragE
This is a refactoring with no user-visible changes (except for GHC API
users). Consider the HsExpr constructors that correspond to user-written
pragmas:
HsSCC representing {-# SCC ... #-}
HsCoreAnn representing {-# CORE ... #-}
HsTickPragma representing {-# GENERATED ... #-}
We can factor them out into a separate datatype, HsPragE. It makes the
code a bit tidier, especially in the parser.
Before this patch:
hpc_annot :: { Located ( (([AddAnn],SourceText),(StringLiteral,(Int,Int),(Int,Int))),
((SourceText,SourceText),(SourceText,SourceText))
) }
After this patch:
prag_hpc :: { Located ([AddAnn], HsPragE GhcPs) }
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f695a20f5f9fe4952ca8cde45d73f3604a7cc29">7f695a20</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-29T08:25:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass ModDetails with (partial) ModIface in HscStatus
(Partial) ModIface and ModDetails are generated at the same time, but
they're passed differently: ModIface is passed in HscStatus consturctors
while ModDetails is returned in a tuple. This refactors ModDetails
passing so that it's passed around with ModIface in HscStatus
constructors. This makes the code more consistent and hopefully easier
to understand: ModIface and ModDetails are really very closely related.
It makes sense to treat them the same way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e921c90fec6754414e97bfabaeeb4eaf0241472d">e921c90f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-29T08:26:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve few Foreign.Marshal.Utils docs
In copyBytes and moveBytes mention which argument is source and which is
destination.
Also fixes some of the crazy indentation in the module and cleans
trailing whitespace.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/316f24319e151446c83cbb0f2997a73e19fe4aa3">316f2431</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-30T02:57:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian docs: Rename the second "validate" entry to "slow-validate" [ci skip]
That would be in line with the implementation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aba5d3218330f8ce127aa7767efcbb6f63a2db1">5aba5d32</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-30T02:58:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove HasSrcSpan (#17494)
Metric Decrease:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1de5c227160f555ea6d5679791388a980910c88">d1de5c22</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-11-30T02:59:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Hadrian by default in validate script (#17527)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a96a0b6db6a32457ae2f91bb711c2481c767656">3a96a0b6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-30T02:59:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simpler Semigroup instance for InsideLam and InterestingCtxt
This mirrors the definition of `(&&)` and `(||)` now, relieving the
Simplifier of a marginal amount of pressure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8cfe81aed556d00eac58e3ad0f5e27c503b636a">f8cfe81a</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-11-30T20:33:49+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve tests for #17171
While backporting MR !1806 to 8.8.2 (!1885) I learnt the following:
* Tests with `expect_fail` do not compare `*.stderr` output files. So a test using `expect_fail` will not detect future regressions on the `stderr` output.
* To compare the `*.stderr` output files, I have to use the `exit_code(n)` function.
* When a release is made, tests with `makefile_test` are converted to use `run_command`.
* For the test `T17171a` the return code is `1` when running `makefile_test`, however it's `2` when running `run_command`.
Therefore I decided:
* To improve my tests for #17171
* To change test T17171a from `expect_fail` to `exit_code(2)`
* To change both tests from `makefile_test` to `run_command`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b113fc957a3fb6eafd10ad41a7caf11009ef4eb">2b113fc9</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-01T08:17:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update DisambECP-related comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beed7c3e7c0703089a9ba4321bd3a2e442213fad">beed7c3e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T03:41:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix location of typing_stubs module
This should fix the build on Debian 8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53251413348186c8fbe2bbe9c2702d274e469324">53251413</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T03:42:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't override LD_LIBRARY_PATH, only prepend
NixOS development environments often require that LD_LIBRARY_PATH
be set in order to find system libraries. T1407 was overriding
LD_LIBRARY_PATH, dropping these directories. Now it merely prepends,
its directory.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65400314244b2486dc4740a4aadd4e1225d38e3c">65400314</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-02T03:42:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Convert warnings into assertions
Since the invariants always hold in the testsuite, we can convert
them to asserts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18baed641fccc7fd91988334544d47505b577810">18baed64</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2019-12-02T03:43:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">API Annotations: Unicode '->' on HsForallTy
The code fragment
type family Proxy2' ∷ ∀ k → k → Type where
Proxy2' = Proxy'
Generates AnnRarrow instead of AnnRarrowU for the first →.
Fixes #17519
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/717f323609857a40fdbefe7a5ba426747512414a">717f3236</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-12-02T03:44:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix more typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bde48f8e5bad1427a530610796d85d299997f80c">bde48f8e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:55:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More Haddock syntax in GHC.Hs.Utils
As suggested by RyanGlScott in !2163.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/038bedbc8daa842a4cd91a0da780d09c78c4984f">038bedbc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify: Fix pretty-printing of strictness
A colleague recently hit the panic in Simplify.addEvals and I noticed
that the message is quite unreadable due to incorrect pretty-printing.
Fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c500f652470d012fa432632ab122a12674bd9788">c500f652</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix changelog linting logic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ead967d48b48020f6ce621f9b27363aca45c363">8ead967d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">win32-init: Drop workaround for #17480
The `process` changes have now been merged into `hsc2hs`.
(cherry picked from commit fa029f53132ad59f847ed012d3b835452cf16615)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d402209ace97212b59ad6f9d7cdd1e1bb15fc425">d402209a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable Sphinx build on Debian 8
The docutils version available appears to be too old to support the
`table` directive's `:widths:` options.
(cherry picked from commit 75764487a96a7a026948b5af5022781872d12baa)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1f688244d7a766a2b71fbe172c86e3cb4c87539">f1f68824</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix <unistd.h> #include
Previously we were including <sys/unistd.h> which is available on glibc
but not musl.
(cherry picked from commit e44b695ca7cb5f3f99eecfba05c9672c6a22205e)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37eb94b3b060ef83685127ec10d14a9675cf508a">37eb94b3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Docker images
Installs pxz on Centos7
(cherry picked from commit 86960e691f7a600be247c32a7cf795bf9abf7cc4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aec98a79a7cc04c3fa8d0f5dfd6cb462daa4e612">aec98a79</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: pxz is unavailable on CentOS 7
Fall back to xz
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6708b8e5b814bf9797e1bbac82622d815e7669b1">6708b8e5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Set LANG on CentOS 7
It otherwise seems to default to ascii
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/470ef0e7d0d6c07b17252a660d72691dd02a1dad">470ef0e7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Consolidate release build configuration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/38338757e0854a0fc6c3a99d1c35392227623887">38338757</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add Debian 10 builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/012f13b5051ff4385542f90c9692ef4ba6450db9">012f13b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix Windows bindist collection
Apparently variable interpolation in the `artifacts.paths` key of
`gitlab-ci.yml` doesn't work on Windows as it does on WIndows.
(cherry picked from commit 100cc756faa4468ed6950116bae30609c1c3468b)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0f09e23dd19f0cf223034f9b787a4f038cd995d">a0f09e23</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Simplify Python <3.5 fallback for TextIO
(cherry picked from commit d092d8598694c23bc07cdcc504dff52fa5f33be1)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b2370ec82294c527f9fbe2d1d66daff9816f837">2b2370ec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add release-x86_64-linux-deb9 job
(cherry picked from commit cbedb3c4a90649f474cb716842ba53afc5a642ca)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1c206fd58a8ff365d4b28dff41fec343884972b">b1c206fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always build source tarball
(cherry picked from commit 67b5de88ef923971f1980335137e3c7193213abd)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4cbd5b47a00a29b7835710f1b91bb93ac8e3f790">4cbd5b47</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-12-02T11:57:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure.ac: make cross-compiler detection stricter
Be more precise at detecting cross-compilation case.
Before the change configuration
$ ./configure --host=x86_64-pc-linux-gnu --target=x86_64-gentoo-linux-musl
was not considered a cross-target. Even though libcs are different (`glibc` vs. `musl`).
Without this patch build fails as:
```
"inplace/bin/ghc-cabal" check libraries/integer-gmp
"inplace/bin/ghc-cabal" configure libraries/integer-gmp dist-install \
--with-ghc="/home/slyfox/dev/git/ghc/inplace/bin/ghc-stage1" \
--with-ghc-pkg="/home/slyfox/dev/git/ghc/inplace/bin/ghc-pkg" \
--disable-library-for-ghci --enable-library-vanilla --enable-library-for-ghci \
--enable-library-profiling --enable-shared --with-hscolour="/usr/bin/HsColour" \
--configure-option=CFLAGS="-Wall \
-Werror=unused-but-set-variable -Wno-error=inline \
-iquote /home/slyfox/dev/git/ghc/libraries/integer-gmp" \
--configure-option=LDFLAGS=" " --configure-option=CPPFLAGS=" \
" --gcc-options="-Wall -Werror=unused-but-set-variable -Wno-error=inline -iquote /home/slyfox/dev/git/ghc/libraries/integer-gmp \
" --with-gcc="x86_64-gentoo-linux-musl-gcc" --with-ld="x86_64-gentoo-linux-musl-ld.gold" --with-ar="x86_64-gentoo-linux-musl-ar" \
--with-alex="/usr/bin/alex" --with-happy="/usr/bin/happy"
Configuring integer-gmp-1.0.2.0...
configure: WARNING: unrecognized options: --with-compiler
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for gcc... /usr/lib/ccache/bin/x86_64-gentoo-linux-musl-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... configure: error: in `/home/slyfox/dev/git/ghc/libraries/integer-gmp/dist-install/build':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details
make[1]: *** [libraries/integer-gmp/ghc.mk:5: libraries/integer-gmp/dist-install/package-data.mk] Error 1
make: *** [Makefile:126: all] Error 2
```
Note: here `ghc-stage1` is assumed to target `musl` target but is passed
`glibc` toolchain. It happens because initial ./configure phase did not
detect host/target as different.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f7cb423d7703788014b675af0cbbd611d19310b">5f7cb423</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-02T23:59:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `timesInt2#` primop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbbe18a274cd094a0582396e83619378a7071386">fbbe18a2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-02T23:59:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use the new timesInt2# primop in integer-gmp (#9431)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a4b8d0cf2ff83d1a04826b9624fffec7b9a5683">5a4b8d0c</a></strong>
<div>
<span>by Athas</span>
<i>at 2019-12-03T00:00:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document RTS behaviour upon encountering '--'.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/705a16df02411ec2445c9a254396a93cabe559ef">705a16df</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T07:11:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make BCO# lifted
In #17424 Simon PJ noted that there is a potentially unsafe occurrence
of unsafeCoerce#, coercing from an unlifted to lifted type. However,
nowhere in the compiler do we assume that a BCO# is not a thunk.
Moreover, in the case of a CAF the result returned by `createBCO` *will*
be a thunk (as noted in [Updatable CAF BCOs]). Consequently it seems
better to rather make BCO# a lifted type and rename it to BCO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35afe4f3b1591740ab8454ebe4c0ec206d2b7e14">35afe4f3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-03T07:12:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Int# primops in `Bits Int{8,16,32,64}` instances
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a51b587ad6a154f89542641593c2b5b2c3f3dde">7a51b587</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-03T07:12:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add constant folding rule (#16402)
narrowN (x .&. m)
m .&. (2^N-1) = 2^N-1
==> narrowN x
e.g. narrow16 (x .&. 0x12FFFF) ==> narrow16 x
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10caee7fd3f048ead668e8bc70d855d9a55f89a5">10caee7f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add 8.12.1 release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25019d18109cd620a2cf6ab0e7d417d14935e8a5">25019d18</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop Uniquable constraint for AnnTarget
This relied on deriveUnique, which was far too subtle to be safely
applied. Thankfully the instance doesn't appear to be used so let's just
drop it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78b67ad0e891fc3b66df72643fb173dc985e8306">78b67ad0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify uniqAway
This does two things:
* Eliminate all uses of Unique.deriveUnique, which was quite easy to
mis-use and extremely subtle.
* Rename the previous "derived unique" notion to "local unique". This
is possible because the only places where `uniqAway` can be safely
used are those where local uniqueness (with respect to some
InScopeSet) is sufficient.
* Rework the implementation of VarEnv.uniqAway, as discussed in #17462.
This should make the operation significantly more efficient than its
previous iterative implementation..
Metric Decrease:
T9872c
T12227
T9233
T14683
T5030
T12545
hie002
Metric Increase:
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f03a41d4bf9418ee028ecb51654c928b2da74edd">f03a41d4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:05:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Elf: Fix link info note generation
Previously we would use the `.int` assembler directive to generate
32-bit words in the note section. However, `.int` is note guaranteed to
produce 4-bytes; in fact, on some platforms (e.g. AArch64) it produces
8-bytes. Use the `.4bytes` directive to avoid this.
Moreover, we used the `.align` directive, which is quite platform
dependent. On AArch64 it appears to not even be idempotent (despite what
the documentation claims). `.balign` is consequentially preferred as it
offers consistent behavior across platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84585e5e7c5d729ce38fa47ebaa7518acd14c2f1">84585e5e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Meaning-preserving SCC annotations (#15730)
This patch implements GHC Proposal #176:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0176-scc-parsing.rst
Before the change:
1 / 2 / 2 = 0.25
1 / {-# SCC "name" #-} 2 / 2 = 1.0
After the change:
1 / 2 / 2 = 0.25
1 / {-# SCC "name" #-} 2 / 2 = parse error
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e49e54705dee111b64c061a01b1e193d89cf84ed">e49e5470</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error messages for SCC pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2b535d9ef8864b2d314c739a0e788a6df911aaf">a2b535d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Try to silence underfull \hbox warnings
We use two tricks, as suggested here [1]:
* Use microtype to try to reduce the incidence of underfull boxes
* Bump up \hbadness to eliminate the warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e47217f85b2006f03e72d0a550fe2cca26cfd93">4e47217f</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2019-12-05T16:07:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sameNat and sameSymbol proxy-polymorphic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8324f0b7357c428f505dccbc84bb7dde897b509c">8324f0b7</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2019-12-05T16:07:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test proxy-polymorphic sameNat and sameSymbol
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69001f54279a55bc4e5e5883c675e5ba6fe49a22">69001f54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Clear segment bitmaps during sweep
Previously we would clear the bitmaps of segments which we are going to
sweep during the preparatory pause. However, this is unnecessary: the
existence of the mark epoch ensures that the sweep will correctly
identify non-reachable objects, even if we do not clear the bitmap.
We now defer clearing the bitmap to sweep, which happens concurrently
with mutation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a9c4295b9f457ca465415b7017f8e343d54339">58a9c429</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable divByZero on non-NCG targets
The LLVM backend does not guarantee any particular semantics for
division by zero, making this test unreliable across platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8280bd8ab7a20a0a78ca53a06279cf8f07864eb5">8280bd8a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Factor out terminal coloring
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92a52aaaf48420335c4beda45cf40388d305c3f2">92a52aaa</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make performance metric summary more readable
Along with some refactoring.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4ca29c796fa86ad9d5cd4dfa1a5cdd4e0565fb0">c4ca29c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Use colors more consistently
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3354c68ec6c90bbccc0f361aa7973eeb75ea229c">3354c68e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pretty-printing of the * kind
Before this patch, GHC always printed the * kind unparenthesized.
This led to two issues:
1. Sometimes GHC printed invalid or incorrect code.
For example, GHC would print: type F @* x = x
when it meant to print: type F @(*) x = x
In the former case, instead of a kind application we were getting a
type operator (@*).
2. Sometimes GHC printed kinds that were correct but hard to read.
Should Either * Int be read as Either (*) Int
or as (*) Either Int ?
This depends on whether -XStarIsType is enabled, but it would be
easier if we didn't have to check for the flag when reading the code.
We can solve both problems by assigning (*) a different precedence. Note
that Haskell98 kinds are not affected:
((* -> *) -> *) -> * does NOT become (((*) -> (*)) -> (*)) -> (*)
The parentheses are added when (*) is used in a function argument
position:
F * * * becomes F (*) (*) (*)
F A * B becomes F A (*) B
Proxy * becomes Proxy (*)
a * -> * becomes a (*) -> *
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70dd0e4b7051e674479729916285b12fc14c696f">70dd0e4b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parenthesize the * kind in TH.Ppr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7a4efbff1badf7daa41256cb506915e4fddee5c">a7a4efbf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/NonMovingSweep: Fix locking of new mutable list allocation
Previously we used allocBlockOnNode_sync in nonmovingSweepMutLists
despite the fact that we aren't in the GC and therefore the allocation
spinlock isn't in use. This meant that sweep would end up spinning until
the next minor GC, when the SM lock was moved away from the SM_MUTEX to
the spinlock. This isn't a correctness issue but it sure isn't good for
performance.
Found thanks for Ward.
Fixes #17539.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f171b3582d44746bf8b08897a3b23bc97e5dbdda">f171b358</a></strong>
<div>
<span>by Matthias Braun</span>
<i>at 2019-12-05T16:07:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in documentation of Base.hs.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9897e8c8ef0b19a9571ef97a1d9bb050c1ee9121">9897e8c8</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-06T21:20:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement pointer tagging for big families (#14373)
Formerly we punted on these and evaluated constructors always got a tag
of 1.
We now cascade switches because we have to check the tag first and when
it is MAX_PTR_TAG then get the precise tag from the info table and
switch on that. The only technically tricky part is that the default
case needs (logical) duplication. To do this we emit an extra label for
it and branch to that from the second switch. This avoids duplicated
codegen.
Here's a simple example of the new code gen:
data D = D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8
On a 64-bit system previously all constructors would be tagged 1. With
the new code gen D7 and D8 are tagged 7:
[Lib.D7_con_entry() {
...
{offset
c1eu: // global
R1 = R1 + 7;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
}
}]
[Lib.D8_con_entry() {
...
{offset
c1ez: // global
R1 = R1 + 7;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
}
}]
When switching we now look at the info table only when the tag is 7. For
example, if we derive Enum for the type above, the Cmm looks like this:
c2Le:
_s2Js::P64 = R1;
_c2Lq::P64 = _s2Js::P64 & 7;
switch [1 .. 7] _c2Lq::P64 {
case 1 : goto c2Lk;
case 2 : goto c2Ll;
case 3 : goto c2Lm;
case 4 : goto c2Ln;
case 5 : goto c2Lo;
case 6 : goto c2Lp;
case 7 : goto c2Lj;
}
// Read info table for tag
c2Lj:
_c2Lv::I64 = %MO_UU_Conv_W32_W64(I32[I64[_s2Js::P64 & (-8)] - 4]);
if (_c2Lv::I64 != 6) goto c2Lu; else goto c2Lt;
Generated Cmm sizes do not change too much, but binaries are very
slightly larger, due to the fact that the new instructions are longer in
encoded form. E.g. previously entry code for D8 above would be
00000000000001c0 <Lib_D8_con_info>:
1c0: 48 ff c3 inc %rbx
1c3: ff 65 00 jmpq *0x0(%rbp)
With this patch
00000000000001d0 <Lib_D8_con_info>:
1d0: 48 83 c3 07 add $0x7,%rbx
1d4: ff 65 00 jmpq *0x0(%rbp)
This is one byte longer.
Secondly, reading info table directly and then switching is shorter
_c1co:
movq -1(%rbx),%rax
movl -4(%rax),%eax
// Switch on info table tag
jmp *_n1d5(,%rax,8)
than doing the same switch, and then for the tag 7 doing another switch:
// When tag is 7
_c1ct:
andq $-8,%rbx
movq (%rbx),%rax
movl -4(%rax),%eax
// Switch on info table tag
...
Some changes of binary sizes in actual programs:
- In NoFib the worst case is 0.1% increase in benchmark "parser" (see
NoFib results below). All programs get slightly larger.
- Stage 2 compiler size does not change.
- In "containers" (the library) size of all object files increases
0.0005%. Size of the test program "bitqueue-properties" increases
0.03%.
nofib benchmarks kindly provided by Ömer (@osa1):
NoFib Results
=============
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS +0.0% 0.0% -0.0% -0.0% -0.0%
CSD +0.0% 0.0% 0.0% +0.0% +0.0%
FS +0.0% 0.0% 0.0% +0.0% 0.0%
S +0.0% 0.0% -0.0% 0.0% 0.0%
VS +0.0% 0.0% -0.0% +0.0% +0.0%
VSD +0.0% 0.0% -0.0% +0.0% -0.0%
VSM +0.0% 0.0% 0.0% 0.0% 0.0%
anna +0.0% 0.0% +0.1% -0.9% -0.0%
ansi +0.0% 0.0% -0.0% +0.0% +0.0%
atom +0.0% 0.0% 0.0% 0.0% 0.0%
awards +0.0% 0.0% -0.0% +0.0% 0.0%
banner +0.0% 0.0% -0.0% +0.0% 0.0%
bernouilli +0.0% 0.0% +0.0% +0.0% +0.0%
binary-trees +0.0% 0.0% -0.0% -0.0% -0.0%
boyer +0.0% 0.0% +0.0% 0.0% -0.0%
boyer2 +0.0% 0.0% +0.0% 0.0% -0.0%
bspt +0.0% 0.0% +0.0% +0.0% 0.0%
cacheprof +0.0% 0.0% +0.1% -0.8% 0.0%
calendar +0.0% 0.0% -0.0% +0.0% -0.0%
cichelli +0.0% 0.0% +0.0% 0.0% 0.0%
circsim +0.0% 0.0% -0.0% -0.1% -0.0%
clausify +0.0% 0.0% +0.0% +0.0% 0.0%
comp_lab_zift +0.0% 0.0% +0.0% 0.0% -0.0%
compress +0.0% 0.0% +0.0% +0.0% 0.0%
compress2 +0.0% 0.0% 0.0% 0.0% 0.0%
constraints +0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 +0.0% 0.0% +0.0% 0.0% 0.0%
cryptarithm2 +0.0% 0.0% +0.0% -0.0% 0.0%
cse +0.0% 0.0% +0.0% +0.0% 0.0%
digits-of-e1 +0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 +0.0% 0.0% +0.0% -0.0% -0.0%
dom-lt +0.0% 0.0% +0.0% +0.0% 0.0%
eliza +0.0% 0.0% -0.0% +0.0% 0.0%
event +0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals +0.0% 0.0% +0.0% +0.0% +0.0%
exp3_8 +0.0% 0.0% -0.0% -0.0% -0.0%
expert +0.0% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux +0.0% 0.0% +0.0% 0.0% 0.0%
fasta +0.0% 0.0% -0.0% -0.0% -0.0%
fem +0.0% 0.0% +0.0% +0.0% +0.0%
fft +0.0% 0.0% +0.0% -0.0% -0.0%
fft2 +0.0% 0.0% +0.0% +0.0% +0.0%
fibheaps +0.0% 0.0% +0.0% +0.0% 0.0%
fish +0.0% 0.0% +0.0% +0.0% 0.0%
fluid +0.0% 0.0% +0.0% +0.0% +0.0%
fulsom +0.0% 0.0% +0.0% -0.0% +0.0%
gamteb +0.0% 0.0% +0.0% -0.0% -0.0%
gcd +0.0% 0.0% +0.0% +0.0% 0.0%
gen_regexps +0.0% 0.0% +0.0% -0.0% -0.0%
genfft +0.0% 0.0% -0.0% -0.0% -0.0%
gg +0.0% 0.0% 0.0% -0.0% 0.0%
grep +0.0% 0.0% +0.0% +0.0% +0.0%
hidden +0.0% 0.0% +0.0% -0.0% -0.0%
hpg +0.0% 0.0% +0.0% -0.1% -0.0%
ida +0.0% 0.0% +0.0% -0.0% -0.0%
infer +0.0% 0.0% -0.0% -0.0% -0.0%
integer +0.0% 0.0% -0.0% -0.0% -0.0%
integrate +0.0% 0.0% 0.0% +0.0% 0.0%
k-nucleotide +0.0% 0.0% -0.0% -0.0% -0.0%
kahan +0.0% 0.0% -0.0% -0.0% -0.0%
knights +0.0% 0.0% +0.0% -0.0% -0.0%
lambda +0.0% 0.0% +1.2% -6.1% -0.0%
last-piece +0.0% 0.0% +0.0% -0.0% -0.0%
lcss +0.0% 0.0% +0.0% -0.0% -0.0%
life +0.0% 0.0% +0.0% -0.0% -0.0%
lift +0.0% 0.0% +0.0% +0.0% 0.0%
linear +0.0% 0.0% +0.0% +0.0% +0.0%
listcompr +0.0% 0.0% -0.0% -0.0% -0.0%
listcopy +0.0% 0.0% -0.0% -0.0% -0.0%
maillist +0.0% 0.0% +0.0% -0.0% -0.0%
mandel +0.0% 0.0% +0.0% +0.0% +0.0%
mandel2 +0.0% 0.0% +0.0% +0.0% -0.0%
mate +0.0% 0.0% +0.0% +0.0% +0.0%
minimax +0.0% 0.0% -0.0% +0.0% -0.0%
mkhprog +0.0% 0.0% +0.0% +0.0% +0.0%
multiplier +0.0% 0.0% 0.0% +0.0% -0.0%
n-body +0.0% 0.0% +0.0% -0.0% -0.0%
nucleic2 +0.0% 0.0% +0.0% +0.0% -0.0%
para +0.0% 0.0% +0.0% +0.0% +0.0%
paraffins +0.0% 0.0% +0.0% +0.0% +0.0%
parser +0.1% 0.0% +0.4% -1.7% -0.0%
parstof +0.0% 0.0% -0.0% -0.0% -0.0%
pic +0.0% 0.0% +0.0% 0.0% -0.0%
pidigits +0.0% 0.0% -0.0% -0.0% -0.0%
power +0.0% 0.0% +0.0% -0.0% -0.0%
pretty +0.0% 0.0% +0.0% +0.0% +0.0%
primes +0.0% 0.0% +0.0% 0.0% 0.0%
primetest +0.0% 0.0% +0.0% +0.0% +0.0%
prolog +0.0% 0.0% +0.0% +0.0% +0.0%
puzzle +0.0% 0.0% +0.0% +0.0% +0.0%
queens +0.0% 0.0% 0.0% +0.0% +0.0%
reptile +0.0% 0.0% +0.0% +0.0% 0.0%
reverse-complem +0.0% 0.0% -0.0% -0.0% -0.0%
rewrite +0.0% 0.0% +0.0% 0.0% -0.0%
rfib +0.0% 0.0% +0.0% +0.0% +0.0%
rsa +0.0% 0.0% +0.0% +0.0% +0.0%
scc +0.0% 0.0% +0.0% +0.0% +0.0%
sched +0.0% 0.0% +0.0% +0.0% +0.0%
scs +0.0% 0.0% +0.0% +0.0% 0.0%
simple +0.0% 0.0% +0.0% +0.0% +0.0%
solid +0.0% 0.0% +0.0% +0.0% 0.0%
sorting +0.0% 0.0% +0.0% -0.0% 0.0%
spectral-norm +0.0% 0.0% -0.0% -0.0% -0.0%
sphere +0.0% 0.0% +0.0% -1.0% 0.0%
symalg +0.0% 0.0% +0.0% +0.0% +0.0%
tak +0.0% 0.0% +0.0% +0.0% +0.0%
transform +0.0% 0.0% +0.4% -1.3% +0.0%
treejoin +0.0% 0.0% +0.0% -0.0% 0.0%
typecheck +0.0% 0.0% -0.0% +0.0% 0.0%
veritas +0.0% 0.0% +0.0% -0.1% +0.0%
wang +0.0% 0.0% +0.0% +0.0% +0.0%
wave4main +0.0% 0.0% +0.0% 0.0% -0.0%
wheel-sieve1 +0.0% 0.0% +0.0% +0.0% +0.0%
wheel-sieve2 +0.0% 0.0% +0.0% +0.0% 0.0%
x2n1 +0.0% 0.0% +0.0% +0.0% 0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -6.1% -0.0%
Max +0.1% 0.0% +1.2% +0.0% +0.0%
Geometric Mean +0.0% -0.0% +0.0% -0.1% -0.0%
NoFib GC Results
================
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim +0.0% 0.0% -0.0% -0.0% -0.0%
constraints +0.0% 0.0% -0.0% 0.0% -0.0%
fibheaps +0.0% 0.0% 0.0% -0.0% -0.0%
fulsom +0.0% 0.0% 0.0% -0.6% -0.0%
gc_bench +0.0% 0.0% 0.0% 0.0% -0.0%
hash +0.0% 0.0% -0.0% -0.0% -0.0%
lcss +0.0% 0.0% 0.0% -0.0% 0.0%
mutstore1 +0.0% 0.0% 0.0% -0.0% -0.0%
mutstore2 +0.0% 0.0% +0.0% -0.0% -0.0%
power +0.0% 0.0% -0.0% 0.0% -0.0%
spellcheck +0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -0.6% -0.0%
Max +0.0% 0.0% +0.0% 0.0% 0.0%
Geometric Mean +0.0% +0.0% +0.0% -0.1% +0.0%
Fixes #14373
These performance regressions appear to be a fluke in CI. See the
discussion in !1742 for details.
Metric Increase:
T6048
T12234
T12425
Naperian
T12150
T5837
T13035
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee07421fcf99189de6506cf8d17185ed540ea2b3">ee07421f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-12-06T21:21:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Work in progress on coercionLKind, coercionRKind
This is a preliminary patch for #17515
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a4ca9eb152c6bfbc3aad71c180a38bbfeca5bfb">0a4ca9eb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-12-06T21:21:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split up coercionKind
This patch implements the idea in #17515, splitting `coercionKind` into:
* `coercion{Left,Right}Kind`, which computes the left/right side of the
pair
* `coercionKind`, which computes the pair of coercible types
This is reduces allocation since we frequently only need only one side
of the pair. Specifically, we see the following improvements on x86-64
Debian 9:
| test | new | old | relative chg. |
| :------- | ---------: | ------------: | ------------: |
| T5030 | 695537752 | 747641152.0 | -6.97% |
| T5321Fun | 449315744 | 474009040.0 | -5.21% |
| T9872a | 2611071400 | 2645040952.0 | -1.28% |
| T9872c | 2957097904 | 2994260264.0 | -1.24% |
| T12227 | 773435072 | 812367768.0 | -4.79% |
| T12545 | 3142687224 | 3215714752.0 | -2.27% |
| T14683 | 9392407664 | 9824775000.0 | -4.40% |
Metric Decrease:
T12545
T9872a
T14683
T5030
T12227
T9872c
T5321Fun
T9872b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d46a72e19e1b508358827e7270139f3273915697">d46a72e1</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-09T12:05:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix comment typos
The below is only necessary to fix the CI perf fluke that
happened in 9897e8c8ef0b19a9571ef97a1d9bb050c1ee9121:
-------------------------
Metric Decrease:
T5837
T6048
T9020
T12425
T12234
T13035
T12150
Naperian
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3bba7e4b221139090edf54a18c7e0e1ec3f9be8">e3bba7e4</a></strong>
<div>
<span>by Micha Wiedenmann</span>
<i>at 2019-12-10T19:52:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Motivation of DefaultSignatures
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/843ceb3892432b28628e4b4bad2c712ca371d02b">843ceb38</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:53:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add a long form flag to enable the non-moving GC
The old flag, `-xn`, was quite cryptic. Here we add `--nonmoving-gc` in
addition.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/921d32381a0bdd693935aa2bada3cd76870bf2f9">921d3238</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-10T19:54:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ignore unary constraint tuples during typechecking (#17511)
We deliberately avoid defining a magical `Unit%` class, for reasons
that I have expounded upon in the newly added
`Note [Ignore unary constraint tuples]` in `TcHsType`. However, a
sneaky user could try to insert `Unit%` into their program by way of
Template Haskell, leading to the interface-file error observed
in #17511. To avoid this, any time we encounter a unary constraint
tuple during typechecking, we drop the surrounding constraint tuple
application. This is safe to do since `Unit% a` and `a` would be
semantically equivalent (unlike other forms of unary tuples).
Fixes #17511.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/436ec9f3b31f9bc7ccf8c685afcda9fc424e45e9">436ec9f3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:55:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move changelog linting logic to shell script
Allowing it to be easily used locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f6b434fc96b1f48315e103f4a77fecc2da89471">2f6b434f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:55:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move changelog linting logic to shell script
Allowing it to be easily used locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a5a6e0718144786c4e0eb7395ede271e57ff4b7">7a5a6e07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:56:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix incorrect @since in GHC.Natural
Fixes #17547.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bbfaf8abac0854a5b7f5485aa830fec669fa602">2bbfaf8a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:57:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: AArch64 supports the GHCi interpreter and SMP
I'm not sure how this was omitted from the list of supported
architectures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f1ceb67331cfbe075c484c8d1d6b6c9f6fc1e92">8f1ceb67</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-10T19:57:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Int# section of primops.txt.pp
This matches the organization of the fixed-sized ones, and keeps each
Int* next to its corresponding Word*.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a823b0ffcbd5b5c4c03334e72c8a36460b62ff7">7a823b0f</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-10T19:57:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Int64# and Word64# sections of primops.txt.pp
This way it is next to the other fixed-sized ones.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd9929ad29fd200405d068463af64dafff6b402">8dd9929a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:58:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add (broken) test for #17510
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e47a76a3d0a7b3d424442914478de579a49363c">6e47a76a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:58:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-layout validate script
This script was previously a whitespace nightmare.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f80c4a66ae219afa7bd4172441f4e94ba649c9d9">f80c4a66</a></strong>
<div>
<span>by Crazycolorz5</span>
<i>at 2019-12-11T14:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Specialize hashing at call site rather than in struct.
Separate word and string hash tables on the type level, and do not store
the hashing function. Thus when a different hash function is desire it
is provided upon accessing the table. This is worst case the same as
before the change, and in the majority of cases is better. Also mark the
functions for aggressive inlining to improve performance. {F1686506}
Reviewers: bgamari, erikd, simonmar
Subscribers: rwbarton, thomie, carter
GHC Trac Issues: #13165
Differential Revision: https://phabricator.haskell.org/D4889
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d1b9619e56e1a83fba9a630e7735adb8ac7c16a">2d1b9619</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-12-11T14:12:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn on inferred polymorphic recursion
Silly users sometimes try to use visible dependent quantification
and polymorphic recursion without a CUSK or SAK. This causes
unexpected errors. So we now adjust expectations with a bit
of helpful messaging.
Closes #17541 and closes #17131.
test cases: dependent/should_fail/T{17541{,b},17131}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4dde485eddacc7a38c47ff1054234e2896c214d8">4dde485e</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-12T02:24:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add --show-unit-ids flag to ghc-pkg
I only added it into --simple-output and ghc-pkg check output;
there are probably other places where it can be adopted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6e1ec08e79950c8cadd1f7a2e01292d6142fbfc">e6e1ec08</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:25:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Simplify and clarify performance test baseline search
The previous implementation was extremely complicated, seemingly to
allow the local and CI namespaces to be searched incrementally. However,
it's quite unclear why this is needed and moreover the implementation
seems to have had quadratic runtime cost in the search depth(!).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29c4609c58005aa4dad887b7396f0e95dfe0c68d">29c4609c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:26:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17549
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f0ee2534fcfd95b0870d09718ac3c31704f5753">9f0ee253</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:26:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move -dwarf and -debug jobs to full-build stage
This sacrifices some precision in favor of improving parallelism.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7179b968c709eb0f5413c8e3847a8a593c596185">7179b968</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:27:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "rts: Drop redundant flags for libffi"
This seems to have regressed builds using `--with-system-libffi`
(#17520).
This reverts commit 3ce18700f80a12c48a029b49c6201ad2410071bb.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc7d56506cb0ab49c385498a2139954397e3c782">cc7d5650</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-16T10:20:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Having no shake upper bound is irresposible
Given that shake is far from "done" API wise,
and is central component to the build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9431f905a1eabcb823b65460560558c08fb55cd9">9431f905</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-16T10:55:50+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add index-state to hadrian/cabal.project
Then one is freer to omit upper bounds, as we won't pick
any new entries on Hackage while building hadrian itself.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e17a866fecebc5f80b4e7da93a73803b86499ca">3e17a866</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-16T19:31:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dataConSig
As suggested in #17291
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75355fdef61da44a395ee9bfa2b9dca0eecea58a">75355fde</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-16T19:31:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use "OrCoVar" functions less
As described in #17291, we'd like to separate coercions and expressions
in a more robust fashion.
This is a small step in this direction.
- `mkLocalId` now panicks on a covar.
Calls where this was not the case were changed to `mkLocalIdOrCoVar`.
- Don't use "OrCoVar" functions in places where we know the type is
not a coercion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9686e132a7fe5bbe517a4748fef6094fe74d43d">f9686e13</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-12-16T19:32:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do more validity checks for quantified constraints
Close #17583.
Test case: typecheck/should_fail/T17563
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af7637651bbc55db81e8cef387faf93951d831c2">af763765</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix Windows artifact collection
Variable interpolation in gitlab-ci.yml apparently doesn't work. Sigh.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6d4b902fe2072c4cf75cfc2ec3d9f595938b3a1">e6d4b902</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use xz --threads on Debian 10
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ba650e9f50724d5bbec6cdd7e1d462cf8b7895a">8ba650e9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow debian 8 build to fail
The python release shipped with deb8 (3.3) is too old for our testsuite
driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac25a3f637d894e9b972600e8942a91570e2dcd0">ac25a3f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use xz --threads on Alpine
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc6280885f15c00703c4fc8305f6d47747910fc2">cc628088</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Another approach for xz detection
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37d788ab42703682ed22642d1a9f97351a12c7cd">37d788ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Re-add release-x86_64-deb9 job
Also eliminate some redundancy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82791382806dcaa0ea2241d97b17e1d3369c0b6">f8279138</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop redundant release-x86_64-linux-deb9 job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8148ff06d13edc99e6b00c45554f61279cfdee2d">8148ff06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as broken on ARMv7
Due to #17554. It's very surprising that this only occurs on ARMv7 but
this is the only place I've seen this failure thusfar.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e5696d1e244a88053675280c9c28669246983f">85e5696d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark prog001 as fragile on ARMv7
Due to #17555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5f0aab05866ff178952cf023e7b0e18b5db9562">a5f0aab0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T10272 as broken on ARMv7
Due to #17556.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e6827c6e4e083eafccabb7a90a38d9d1262bbed">1e6827c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13825-debugger as broken on ARMv7
Due to #17557.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cef0b7d707c0b242ee788919f76a73d1a3d2c96">7cef0b7d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14028 as broken on ARMv7
Due to #17558.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ea4eb4babf090e447277a3e4b0dea31d79e9acf">6ea4eb4b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make ghc_built_by_llvm check more precise
Previously it would hackily look at the flavour name to determine
whether LLVM was used to build stage2 ghc. However, this didn't work at
all with Hadrian and would miss cases like ARM where we use the LLVM
backend by default.
See #16087 for the motivation for why ghc_built_by_llvm is needed at
all. This should catch one of the ARMv7 failures described in #17555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3e82bf7d74b96f2efc10a2a83c52395aaee400d">c3e82bf7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T5435_* tests as broken on ARM
`T5435_v_asm_a`, `T5435_v_asm_b`, and `T5435_v_gcc` all fail on ARMv7.
See #17559.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb2aa851bc22f5445963b909b2105009a7abb949">eb2aa851</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't allow armv7 jobs to fail
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/efc92216f0f961dd86f1fcbc20fd79b4af41e95b">efc92216</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "testsuite: Mark cgrun057 as broken on ARMv7"
This reverts commit 6cfc47ec8a478e1751cb3e7338954da1853c3996.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d2bb9eb828f8daac552a9494746b6d6af60b515">1d2bb9eb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark print002 as fragile on ARM
Due to #17557.
Also accepting spurious performance change.
Metric Decrease:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41f4e4fbe637d22bfded6f1597af57337ae5cf15">41f4e4fb</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ambiguous occurence error when building Hadrian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4374983a60d533768d7cc8a3b29a6e9a2e6babdb">4374983a</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename SphinxMode constructors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8f7ecd54821493dc061c55ceebb7e271b17056e">a8f7ecd5</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use *Mode suffix instead of *M
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58655b9da7599135395417a042f53cfa13b2151d">58655b9d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-18T13:43:37+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add GHC-API logging hooks
* Add 'dumpAction' hook to DynFlags.
It allows GHC API users to catch dumped intermediate codes and
information. The format of the dump (Core, Stg, raw text, etc.) is now
reported allowing easier automatic handling.
* Add 'traceAction' hook to DynFlags.
Some dumps go through the trace mechanism (for instance unfoldings that
have been considered for inlining). This is problematic because:
1) dumps aren't written into files even with -ddump-to-file on
2) dumps are written on stdout even with GHC API
3) in this specific case, dumping depends on unsafe globally stored
DynFlags which is bad for GHC API users
We introduce 'traceAction' hook which allows GHC API to catch those
traces and to avoid using globally stored DynFlags.
* Avoid dumping empty logs via dumpAction/traceAction (but still write
empty files to keep the existing behavior)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fad866e028e577b55510a3f9a2faf26d6fdd7bce">fad866e0</a></strong>
<div>
<span>by Moritz Kiefer</span>
<i>at 2019-12-19T11:15:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid race condition in hDuplicateTo
In our codebase we have some code along the lines of
```
newStdout <- hDuplicate stdout
stderr `hDuplicateTo` stdout
```
to avoid stray `putStrLn`s from corrupting a protocol (LSP) that is
run over stdout.
On CI we have seen a bunch of issues where `dup2` returned `EBUSY` so
this fails with `ResourceExhausted` in Haskell.
I’ve spent some time looking at the docs for `dup2` and the code in
`base` and afaict the following race condition is being triggered
here:
1. The user calls `hDuplicateTo stderr stdout`.
2. `hDuplicateTo` calls `hClose_help stdout_`, this closes the file
handle for stdout.
3. The file handle for stdout is now free, so another thread
allocating a file might get stdout.
4. If `dup2` is called while `stdout` (now pointing to something
else) is half-open, it returns EBUSY.
I think there might actually be an even worse case where `dup2` is run
after FD 1 is fully open again. In that case, you will end up not just
redirecting the original stdout to stderr but also the whatever
resulted in that file handle being allocated.
As far as I can tell, `dup2` takes care of closing the file handle
itself so there is no reason to do this in `hDuplicateTo`. So this PR
replaces the call to `hClose_help` by the only part of `hClose_help`
that we actually care about, namely, `flushWriteBuffer`.
I tested this on our codebase fairly extensively and haven’t been able
to reproduce the issue with this patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c114c6599c1df93b208c5f2b1754523858d80ee">0c114c65</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-19T11:16:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle large ARR_WORDS in heap census (fix #17572)
We can do a heap census with a non-profiling RTS. With a non-profiling
RTS we don't zero superfluous bytes of shrunk arrays hence a need to
handle the case specifically to avoid a crash.
Revert part of a586b33f8e8ad60b5c5ef3501c89e9b71794bbed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a0d1a6583cc39a31d6947eda1d4998c4fb53c4f">1a0d1a65</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-20T10:50:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deduplicate copied monad failure handler code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70e56b272492b65e41a149ec39a939e794fea66b">70e56b27</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-20T10:50:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">lookupBindGroupOcc: recommend names in the same namespace (#17593)
Previously, `lookupBindGroupOcc`'s error message would recommend all
similar names in scope, regardless of whether they were type
constructors, data constructors, or functions, leading to the
confusion witnessed in #17593. This is easily fixed by only
recommending names in the same namespace, using the
`nameSpacesRelated` function.
Fixes #17593.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c12355ece0fa14e534c71a9f7327eda9773fad9">3c12355e</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-12-24T01:03:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix endian handling w.r.t. CPP macro WORDS_BIGENDIAN
Include header file `ghcautoconf.h` where the CPP macro
`WORDS_BIGENDIAN` is defined. This finally fixes #17337 (in conjunction
with commit 6c59cc71dc).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11f8eef5a9625c77f78a829406c446b615ed6168">11f8eef5</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-12-24T01:03:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fixup! Fix endian handling w.r.t. CPP macro WORDS_BIGENDIAN
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40327b037f7115f7b05cc0265acb787671bea294">40327b03</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-24T01:04:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove outdated comment
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aeea92ef6ffa514793b1d37b38aaed3616c5c24a">aeea92ef</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-25T19:23:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch to ReadTheDocs theme for the user-guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26493eab8c64776b3133a3c0b3bac33fbd28546c">26493eab</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-25T19:24:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix copy-paste error in comment</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/776df719905b2d39845268a87026bfec90b2795f">776df719</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-25T19:24:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix comment about minimal gcc version
to be consistent what FP_GCC_VERSION requires</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b17114dc360689651f2005126f5dc25510a7263">3b17114d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-12-26T14:09:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactor in ghc.cabal.in:
- Remove outdated comments
- Move cutils.c from parser to cbits
- Remove unused cutils.h
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/334290b6681796dd141c964b88c541da13ce03c7">334290b6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-26T14:09:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace panic/notHandled with noExtCon in DsMeta
There are many spots in `DsMeta` where `panic` or `notHandled` is
used after pattern-matching on a TTG extension constructor. This is
overkill, however, as using `noExtCon` would work just as well. This
patch switches out these panics for `noExtCon`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68252aa3eb833c9747c59de3a7655a1def1b7a76">68252aa3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-27T15:11:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T17499 when built against integer-simple
Since it routinely times out in CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c51aeebc79edd9b317109019522b5ee557c92df">0c51aeeb</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">suppress popup dialog about missing Xcode at configure
tested with `bash` and `zsh`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d76bcc2c0111fdd5ee0ed3e60cdce91ca2172c5">8d76bcc2</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">while at it rename XCode to the official Xcode
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47a68205d5781a65504b255f1e8e08b162f0c6eb">47a68205</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-27T15:12:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as fragile on ARM
As reported in #17554. Only marking on ARM for now although there is
evidence to suggest that the issue may occur on other platforms as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d03dec8ff7681423b9cafa2ce1b5b5f624e664c7">d03dec8f</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:13:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">use shell variable CcLlvmBackend for test
Previously we used `AC_DEFINE`d variable `CC_LLVM_BACKEND` which has an empty shell expansion.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2528e6847d6ab11b452998e5511d60b26453f022">2528e684</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:51:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">driver: Include debug level in the recompilation check hash
Fixes #17586.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f14bb50b76a60253a090797c652a9d29120bf875">f14bb50b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Ensure that nonmoving gc isn't used with profiling
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b426de376e278af5fb7a8ce0ef7b1e245847c662">b426de37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Ensure that entry labels don't have predecessors
The LLVM IR forbids the entry label of a procedure from having any
predecessors. In the case of a simple looping function the LLVM code
generator broke this invariant, as noted in #17589. Fix this by
moving the function prologue to its own basic block, as suggested by
@kavon in #11649.
Fixes #11649 and #17589.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/613f7265c7985b779877e6897118c53d5a333f10">613f7265</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Drop old fix for #11649
This was a hack which is no longer necessary now since we introduce a
dedicated entry block for each procedure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdeffa5e56abccc64df750ba67a39b4af99adac5">fdeffa5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:53:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Error on invalid --numa flags
Previously things like `+RTS --numa-debug` would enable NUMA support,
despite being an invalid flag.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ce3ba68ad30d2173983be309ecfc08737e1dc38">9ce3ba68</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:53:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix --debug-numa mode under Docker
As noted in #17606, Docker disallows the get_mempolicy syscall by
default. This caused numerous tests to fail under CI in the `debug_numa`
way. Avoid this by disabling the NUMA probing logic when --debug-numa is
in use, instead setting n_numa_nodes in RtsFlags.c.
Fixes #17606.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5baa2a4326700c3044904ca0535d45d373ef3b89">5baa2a43</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:54:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable derefnull when built with LLVM
LLVM does not guarantee any particular semantics when dereferencing null
pointers. Consequently, this test actually passes when built with the
LLVM backend.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd544d3df7ebe6326e38d532ddc4a3756c8fe029">bd544d3d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:54:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Track hash of Cabal Setup builder arguments
Lest we fail to rebuild when they change. Fixes #17611.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2c495e3c600710bb6fc07dfb3cf0af41b362da">6e2c495e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TcIface: Fix inverted logic in typechecking of source ticks
Previously we would throw away source ticks when the debug level was
non-zero. This is precisely the opposite of what was intended.
Fixes #17616.
Metric Decrease:
T13056
T9020
T9961
T12425
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7fad387d4c2ab8031eb28cf6b02b4e35f7143374">7fad387d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">perf_notes: Add --zero-y argument
This makes it easier to see the true magnitude of fluctuations.
Also do some house-keeping in the argument parsing department.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d42b287c3fe2510433a7fb744531a0765ad8ac8">0d42b287</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Enlarge acceptance window for T1969
As noted in #17624, it's quite unstable, especially, for some reason, on
i386 and armv7 (something about 32-bit platforms perhaps?).
Metric Increase:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb6082358cdb5f271a8e4c74044a12f97352c52f">eb608235</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-31T14:22:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy (#13009): Stg
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d710fd666a70ae100120042c8549634537001609">d710fd66</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-31T14:23:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: update some Haddock tests
Fixed tests:
* haddockA039: added to all.T
* haddockE004: replaced with T17561 (marked as expect_broken)
New tests:
* haddockA040: deriving clause for a data instance
* haddockA041: haddock and CPP #include
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/859ebdd446eda446d38708a587503c255b58c4c6">859ebdd4</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add "-Iw" RTS flag for minimum wait between idle GCs (#11134)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd4b65519f99e85a7e8f5c2dcb654a8d463c8858">dd4b6551</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional Note explaining the -Iw flag
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4279ff18070c398b5ddc677f9c5a915de68dafc">c4279ff1</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix some sloppy indentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b84c09d533faf576c406ce9f7163efecf3037787">b84c09d5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-12-31T23:45:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak Cmm dumps to avoid generating sections for empty groups
When dumping Cmm groups check if the group is empty, to avoid generating
empty sections in dump files like
==================== Output Cmm ====================
[]
Also fixes a few bad indentation in the code around changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2e0323f318959c879629ef277f6433b44473c4b">b2e0323f</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-01-03T21:22:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify mrStr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c9dc06ba2034e867c9169e60e854539875654fd">3c9dc06b</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2020-01-04T15:55:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos, via a Levenshtein-style corrector
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d561c8f6244f8280a2483e8753c38e39d34c1f01">d561c8f6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-04T15:55:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Cmm related hooks
* stgToCmm hook
* cmmToRawCmm hook
These hooks are used by Asterius and could be useful to other clients of
the GHC API.
It increases the Parser dependencies (test CountParserDeps) to 184. It's
still less than 200 which was the initial request (cf
https://mail.haskell.org/pipermail/ghc-devs/2019-September/018122.html)
so I think it's ok to merge this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae6b62765b12b44163612488a94a9ac270b4dcc5">ae6b6276</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-01-04T15:56:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update to Cabal submodule to v3.2.0.0-alpha3
Metric Increase:
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/073f7cfdf374846e287f826cf6a83e7b3fec55a6">073f7cfd</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-01-04T15:56:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add lexerDbg to dump the tokens fed to the parser
This a small utility function that comes in handy when debugging the
lexer and the parser.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558d4d4a2b5927875dceb42e120026e75e313f33">558d4d4a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-04T15:57:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split integerGmpInternals test in several parts
This is to prepare for ghc-bignum which implements some but not all of
gmp functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4056b9666a0fc5865a82fbba03e8312d7900ac5b">4056b966</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-04T15:58:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as fragile on all platforms
I have seen this fail both on x86-64/Debian 9 and armv7/Debian 9
See #17554.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ffea0c6c6a2670fd6819540f3ea61ce6620caaa">5ffea0c6</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-01-06T18:38:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix overflow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99a9f51bf8207c79241fc0b685fadeb222a61292">99a9f51b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-06T18:39:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Iface (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7aa4a0615629f36e520c11c7e40db7b1475b6402">7aa4a061</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:11:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Only check GCC version if CC is GCC
Also refactor FP_GCC_EXTRA_FLAGS in a few ways:
* We no longer support compilers which lack support for -fno-builtin
and -fwrapv so remove the condition on GccVersion
* These flags are only necessary when using the via-C backend
so make them conditional on Unregisterised.
Fixes #15742.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0805ed7ef32891685109b6cf3461f8adb4ca6981">0805ed7e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-07T13:12:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use non-empty lists to remove partiality in matching code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7844f3a84fca2a79910f164f5a9d2d44b589bb44">7844f3a8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T17073 as broken on Windows
Due to #17607.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acf40cae24dab7be7c719dba191daa5cf9f7e676">acf40cae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disallow Windows from failing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34bc02c7bc8b7e8c267e6da9a8c35a6c25f1b72e">34bc02c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Find Python3 for testsuite
In addition, we prefer the Mingw64 Python distribution on Windows due
to #17483.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e35fe8d58f18bd179efdc848c617dc9eddf4478b">e35fe8d5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix Windows platform test
Previously we used platform.system() and while this worked fine (e.g.
returned `Windows`, as expected) locally under both msys and MingW64
Python distributions, it inexplicably returned `MINGW64_NT-10.0`
under MingW64 Python on CI. It seems os.name is more reliable so we now
use that instead..
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48ef62175d4e65d3248f2e743750ec2f4d421f3a">48ef6217</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rename push-test-metrics.sh to test-metrics.sh
Refactoring to follow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2234fa9252b5da2e4423d1ec52c9830130ecfe35">2234fa92</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Pull test metrics before running testsuite
Otherwise the testsuite driver may not have an up-to-date
baseline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1ca9adbc88903afe49de0d063ccd35daf43f7d9e">1ca9adbc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-07T13:14:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove `parallel` check from configure.ac
`parallel` is no longer a submodule since 3cb063c805ec841ca33b8371ef8aba9329221b6c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b69a3460d11cba49e861f708100801c8e25efa3e">b69a3460</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-07T13:14:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Monomorphize HsModule to GhcPs (#17642)
Analyzing the call sites for `HsModule` reveals that it is only ever
used with parsed code (i.e., `GhcPs`). This simplifies `HsModule` by
concretizing its `pass` parameter to always be `GhcPs`.
Fixes #17642.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d491a6795d507eabe35d8aec63c534d29f2d305b">d491a679</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-08T06:16:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Renamer (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d589410f6bf394c8aca53f18848bbe4dfca92f23">d589410f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-08T06:17:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haskeline submodule to 0.8.0.1
(cherry picked from commit feb3b955402d53c3875dd7a9a39f322827e5bd69)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/923a127205dd60147453f4420614efd1be29f070">923a1272</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-08T06:17:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print Core type applications with no whitespace after @ (#17643)
This brings the pretty-printer for Core in line with how visible
type applications are normally printed: namely, with no whitespace
after the `@` character (i.e., `f @a` instead of `f @ a`). While I'm
in town, I also give the same treatment to type abstractions (i.e.,
`\(@a)` instead of `\(@ a)`) and coercion applications (i.e.,
`f @~x` instead of `f @~ x`).
Fixes #17643.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49f83a0de12a7c02f4a6e99d26eaa362a373afa5">49f83a0d</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-01-12T21:28:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">improve docs for HeaderInfo.getImports
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9129210f7e9937c1065330295f06524661575839">9129210f</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-01-12T21:28:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Overloaded Quotation Brackets (#246)
This patch implements overloaded quotation brackets which generalise the
desugaring of all quotation forms in terms of a new minimal interface.
The main change is that a quotation, for example, [e| 5 |], will now
have type `Quote m => m Exp` rather than `Q Exp`. The `Quote` typeclass
contains a single method for generating new names which is used when
desugaring binding structures.
The return type of functions from the `Lift` type class, `lift` and `liftTyped` have
been restricted to `forall m . Quote m => m Exp` rather than returning a
result in a Q monad.
More details about the feature can be read in the GHC proposal.
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0246-overloaded-bracket.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/350e2b78788d47255d27489dfc62d664498b5de4">350e2b78</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-01-12T21:29:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't zap to Any; error instead
This changes GHC's treatment of so-called Naughty Quantification
Candidates to issue errors, instead of zapping to Any.
Close #16775.
No new test cases, because existing ones cover this well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b5ddc7f2c10ee84631dd6cb5f6368afbc389449">0b5ddc7f</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2020-01-12T21:30:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix more typos, via an improved Levenshtein-style corrector
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f732dbec2159e314619d372aa9cc34d6ab8fadf5">f732dbec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-12T21:30:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Retain bindists used by head.hackage for longer
Previously we would keep them for two weeks. However, on the stable
branches two weeks can easily elapse with no pushes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8636da51449ab13399cb029e3e55d7a246ac5a6">c8636da5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-12T21:31:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix LANG=C for readelf invocation in T14999
The test fails when used with LANG=fr_FR.UTF-8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/077a88de5c0981badbb61b06f32073d7f3a49b08">077a88de</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-01-12T21:32:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide/debug-info: typo “behivior”</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61916c5d038c3b0e87148d3b46149a32f7379ea9">61916c5d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add comments about TH levels
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1fd766ca7ac1feea1e9c752f8ce438fab8e01d35">1fd766ca</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments about constraint floating
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de01427e6b1d45122c84eaf03122fda26c4dc688">de01427e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactor around quantified constraints
This patch clarifies a dark corner of quantified
constraints.
* See Note [Yukky eq_sel for a HoleDest] in TcSMonad
* Minor refactor, breaking out new function
TcInteract.doTopReactEqPred
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30be3bf13a6e72247ff561df1f291370dad79ef9">30be3bf1</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments in TcHsType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5977d4dacc43e76438acb316d12575e0ead18e2">c5977d4d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-16T05:58:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better documentation for mkEtaWW [skip ci]
So that hopefully I understand it faster next time. Also got rid of the
confusing `orig_expr`, which makes the call site in `etaExpand` look out
of sync with the passed `n` (which is not the original `n`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22c0bdc3f3a4e3b787b64ec0f3adba5c7c5b5d04">22c0bdc3</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T05:59:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle TagToEnum in the same big case as the other primops
Before, it was a panic because it was handled above. But there must have
been an error in my reasoning (another caller?) because #17442 reported
the panic was hit.
But, rather than figuring out what happened, I can just make it
impossible by construction. By adding just a bit more bureaucracy in the
return types, I can handle TagToEnum in the same case as all the others,
so the big case is is now total, and the panic is removed.
Fixes #17442
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee5d63f40c2f507d09a16377a5b35c4c8669a028">ee5d63f4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T05:59:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get rid of OpDest
`OpDest` was basically a defunctionalization. Just turn the code that
cased on it into those functions, and call them directly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1ff552265bbbcc0dba272d4742e8be79baad2c51">1ff55226</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T06:00:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove special case case of bool during STG -> C--
Allow removing the no longer needed cgPrimOp, getting rid of a small a
small layer violation too.
Change which made the special case no longer needed was #6135 /
6579a6c73082387f82b994305011f011d9d8382b, which dates back to 2013,
making me feel better.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f416fe6432c0f2f2237f096a9fb0e58e897b4ba5">f416fe64</a></strong>
<div>
<span>by Adam Wespiser</span>
<i>at 2020-01-16T06:00:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">replace dead html link (fixes #17661)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6bf2ce88a13bab21ac6da289f3d32dd8f811048">f6bf2ce8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-16T06:01:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "`exprOkForSpeculation` for Note [IO hack in the demand analyser]"
This reverts commit ce64b397777408731c6dd3f5c55ea8415f9f565b on the
grounds of the regression it would introduce in a couple of packages.
Fixes #17653.
Also undoes a slight metric increase in #13701 introduced by that commit
that we didn't see prior to !1983.
Metric Decrease:
T13701
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a71323ffebf7663c50025d2731bf9de2d04f82c3">a71323ff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-17T08:43:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't FORCE_SYMLINKS on Windows
Not all runners have symlink permissions enabled.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0499e3bcd0ea04b7371cee56a8aea1781e9e371f">0499e3bc</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:31:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix +RTS -Z flag documentation
Stack squeezing is done on context switch, not on GC or stack overflow.
Fix the documentation.
Fixes #17685
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a661df91da5d867ab3e6a912e03a9e1756e59cb6">a661df91</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:32:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document Stg.FVs module
Fixes #17662
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db24e4803fe9fb13b85fc83193ff4afc407702f6">db24e480</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Don't trash STG registers
Fixes #13904.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3d7fdb3437a6161cf7ff1f30cd0a6563bf07db0">f3d7fdb3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Fix typo in readnone attribute
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/442751c605d8a9792014a9e3e694db5b312e80c3">442751c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Add lower-expect to the -O0 optimisation set
@kavon says that this will improve block layout for stack checks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e90ecc932c4857c774405dc398c940290f70f371">e90ecc93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Fix #14251
Fixes the calling convention for functions passing raw SSE-register
values by adding padding as needed to get the values in the right
registers. This problem cropped up when some args were unused an dropped
from the live list.
This folds together 2e23e1c7de01c92b038e55ce53d11bf9db993dd4 and
73273be476a8cc6c13368660b042b3b0614fd928 previously from @kavon.
Metric Increase:
T12707
ManyConstructors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66e511a416b80585995d2b4a669eb037471cb57d">66e511a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:33:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Preserve more information in framework failures
Namely print the entire exception in hopes that this will help track
down #17649.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b62b8cea0e19073133bf3b6757500d1723d02159">b62b8cea</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:34:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove deprecated -smp flag
It was deprecated in 2012 with 46258b40
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c04a86af8bc04ee6f966a17381b88a297a54836">0c04a86a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:34:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Reenable submodule linter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bfabd2282e9ced19a273aa94b5d8dd1a27d6bfa">2bfabd22</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:34:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow submodule cleaning to fail on Windows
Currently CI is inexplicably failing with
```
$ git submodule foreach git clean -xdf
fatal: not a git repository: libffi-tarballs/../.git/modules/libffi-tarballs
```
I have no idea how this working tree got into such a state but we do
need to fail more gracefully when it happens. Consequently, we allow the
cleaning step to fail.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/14bced999dc8c826a9a10dfd922dadf2d681ffe3">14bced99</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-20T15:35:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put the docs for :instances in alphabetical position
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e0bb82b5e267596c18e1086afd6007a00d2c072">7e0bb82b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:35:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing Note [Improvement from Ground Wanteds]
Closes #17659.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17e43a7cd48d862f38d3944d44024646f2e97b87">17e43a7c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:36:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">unregisterised: Fix declaration for stg_NO_FINALIZER
Previously it had a redundant _entry suffix. We never noticed this
previously presumably because we never generated references to it
(however hard to believe this may be). However, it did start failing in
!1304.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dae006fc424e768bb43fc73851a08fefcb732a5">3dae006f</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-01-20T15:37:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid ./configure failure on NetBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/738e2912bfa2122074630d38693a260e4b58aeaf">738e2912</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-24T13:42:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen acceptance window of T1969
I have seen >20% fluctuations in this number, leading to spurious
failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad4eb7a76f6f1fb18e3ea47665feb3a9893427de">ad4eb7a7</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-01-25T05:19:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the fact, that openFileBlocking can consume an OS thread indefinitely.
Also state that a deadlock can happen with the non-threaded runtime.
[ci skip]</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be910728d78fdf2ee800828ecdc8a11bd64fdad0">be910728</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:19:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`-ddump-str-signatures` dumps Text, not STG [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e57d8a106a61cac11bacb43633b8b4af12d7fdb">0e57d8a1</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-25T05:20:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix chaining tagged and untagged ptrs in compacting GC
Currently compacting GC has the invariant that in a chain all fields are tagged
the same. However this does not really hold: root pointers are not tagged, so
when we thread a root we initialize a chain without a tag. When the pointed
objects is evaluated and we have more pointers to it from the heap, we then add
*tagged* fields to the chain (because pointers to it from the heap are tagged),
ending up chaining fields with different tags (pointers from roots are NOT
tagged, pointers from heap are). This breaks the invariant and as a result
compacting GC turns tagged pointers into non-tagged.
This later causes problem in the generated code where we do reads assuming that
the pointer is aligned, e.g.
0x7(%rax) -- assumes that pointer is tagged 1
which causes misaligned reads. This caused #17088.
We fix this using the "pointer tagging for large families" patch (#14373,
!1742):
- With the pointer tagging patch the GC can know what the tagged pointer to a
CONSTR should be (previously we'd need to know the family size -- large
families are always tagged 1, small families are tagged depending on the
constructor).
- Since we now know what the tags should be we no longer need to store the
pointer tag in the info table pointers when forming chains in the compacting
GC.
As a result we no longer need to tag pointers in chains with 1/2 depending on
whether the field points to an info table pointer, or to another field: an info
table pointer is always tagged 0, everything else in the chain is tagged 1. The
lost tags in pointers can be retrieved by looking at the info table.
Finally, instead of using tag 1 for fields and tag 0 for info table pointers, we
use two different tags for fields:
- 1 for fields that have untagged pointers
- 2 for fields that have tagged pointers
When unchaining we then look at the pointer to a field, and depending on its tag
we either leave a tagged pointer or an untagged pointer in the field.
This allows chaining untagged and tagged fields together in compacting GC.
Fixes #17088
Nofib results
-------------
Binaries are smaller because of smaller `Compact.c` code.
make mode=fast EXTRA_RUNTEST_OPTS="-cachegrind" EXTRA_HC_OPTS="-with-rtsopts=-c" NoFibRuns=1
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.3% 0.0% +0.0% +0.0% +0.0%
CSD -0.3% 0.0% +0.0% +0.0% +0.0%
FS -0.3% 0.0% +0.0% -0.0% -0.0%
S -0.3% 0.0% +5.4% +0.8% +3.9%
VS -0.3% 0.0% +0.0% -0.0% -0.0%
VSD -0.3% 0.0% -0.0% -0.0% -0.2%
VSM -0.3% 0.0% +0.0% +0.0% +0.0%
anna -0.1% 0.0% +0.0% +0.0% +0.0%
ansi -0.3% 0.0% +0.1% +0.0% +0.0%
atom -0.2% 0.0% +0.0% +0.0% +0.0%
awards -0.2% 0.0% +0.0% 0.0% -0.0%
banner -0.3% 0.0% +0.0% +0.0% +0.0%
bernouilli -0.3% 0.0% +0.1% +0.0% +0.0%
binary-trees -0.2% 0.0% +0.0% 0.0% +0.0%
boyer -0.3% 0.0% +0.2% +0.0% +0.0%
boyer2 -0.2% 0.0% +0.2% +0.1% +0.0%
bspt -0.2% 0.0% +0.0% +0.0% +0.0%
cacheprof -0.2% 0.0% +0.0% +0.0% +0.0%
calendar -0.3% 0.0% +0.0% +0.0% +0.0%
cichelli -0.3% 0.0% +1.1% +0.2% +0.5%
circsim -0.2% 0.0% +0.0% -0.0% -0.0%
clausify -0.3% 0.0% +0.0% -0.0% -0.0%
comp_lab_zift -0.2% 0.0% +0.0% +0.0% +0.0%
compress -0.3% 0.0% +0.0% +0.0% +0.0%
compress2 -0.3% 0.0% +0.0% -0.0% -0.0%
constraints -0.3% 0.0% +0.2% +0.1% +0.1%
cryptarithm1 -0.3% 0.0% +0.0% -0.0% 0.0%
cryptarithm2 -0.3% 0.0% +0.0% +0.0% +0.0%
cse -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e1 -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e2 -0.3% 0.0% +0.0% +0.0% -0.0%
dom-lt -0.2% 0.0% +0.0% +0.0% +0.0%
eliza -0.2% 0.0% +0.0% +0.0% +0.0%
event -0.3% 0.0% +0.1% +0.0% -0.0%
exact-reals -0.2% 0.0% +0.0% +0.0% +0.0%
exp3_8 -0.3% 0.0% +0.0% +0.0% +0.0%
expert -0.2% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux -0.3% 0.0% -0.0% -0.0% -0.0%
fasta -0.3% 0.0% +0.0% +0.0% +0.0%
fem -0.2% 0.0% +0.1% +0.0% +0.0%
fft -0.2% 0.0% +0.0% -0.0% -0.0%
fft2 -0.2% 0.0% +0.0% -0.0% +0.0%
fibheaps -0.3% 0.0% +0.0% -0.0% -0.0%
fish -0.3% 0.0% +0.0% +0.0% +0.0%
fluid -0.2% 0.0% +0.4% +0.1% +0.1%
fulsom -0.2% 0.0% +0.0% +0.0% +0.0%
gamteb -0.2% 0.0% +0.1% +0.0% +0.0%
gcd -0.3% 0.0% +0.0% +0.0% +0.0%
gen_regexps -0.3% 0.0% +0.0% -0.0% -0.0%
genfft -0.3% 0.0% +0.0% +0.0% +0.0%
gg -0.2% 0.0% +0.7% +0.3% +0.2%
grep -0.2% 0.0% +0.0% +0.0% +0.0%
hidden -0.2% 0.0% +0.0% +0.0% +0.0%
hpg -0.2% 0.0% +0.1% +0.0% +0.0%
ida -0.3% 0.0% +0.0% +0.0% +0.0%
infer -0.2% 0.0% +0.0% -0.0% -0.0%
integer -0.3% 0.0% +0.0% +0.0% +0.0%
integrate -0.2% 0.0% +0.0% +0.0% +0.0%
k-nucleotide -0.2% 0.0% +0.0% +0.0% -0.0%
kahan -0.3% 0.0% -0.0% -0.0% -0.0%
knights -0.3% 0.0% +0.0% -0.0% -0.0%
lambda -0.3% 0.0% +0.0% -0.0% -0.0%
last-piece -0.3% 0.0% +0.0% +0.0% +0.0%
lcss -0.3% 0.0% +0.0% +0.0% 0.0%
life -0.3% 0.0% +0.0% -0.0% -0.0%
lift -0.2% 0.0% +0.0% +0.0% +0.0%
linear -0.2% 0.0% +0.0% +0.0% +0.0%
listcompr -0.3% 0.0% +0.0% +0.0% +0.0%
listcopy -0.3% 0.0% +0.0% +0.0% +0.0%
maillist -0.3% 0.0% +0.0% -0.0% -0.0%
mandel -0.2% 0.0% +0.0% +0.0% +0.0%
mandel2 -0.3% 0.0% +0.0% +0.0% +0.0%
mate -0.2% 0.0% +0.0% +0.0% +0.0%
minimax -0.3% 0.0% +0.0% +0.0% +0.0%
mkhprog -0.2% 0.0% +0.0% +0.0% +0.0%
multiplier -0.3% 0.0% +0.0% -0.0% -0.0%
n-body -0.2% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.2% 0.0% +0.0% +0.0% +0.0%
para -0.2% 0.0% +0.0% -0.0% -0.0%
paraffins -0.3% 0.0% +0.0% -0.0% -0.0%
parser -0.2% 0.0% +0.0% +0.0% +0.0%
parstof -0.2% 0.0% +0.8% +0.2% +0.2%
pic -0.2% 0.0% +0.1% -0.1% -0.1%
pidigits -0.3% 0.0% +0.0% +0.0% +0.0%
power -0.2% 0.0% +0.0% -0.0% -0.0%
pretty -0.3% 0.0% -0.0% -0.0% -0.1%
primes -0.3% 0.0% +0.0% +0.0% -0.0%
primetest -0.2% 0.0% +0.0% -0.0% -0.0%
prolog -0.3% 0.0% +0.0% -0.0% -0.0%
puzzle -0.3% 0.0% +0.0% +0.0% +0.0%
queens -0.3% 0.0% +0.0% +0.0% +0.0%
reptile -0.2% 0.0% +0.2% +0.1% +0.0%
reverse-complem -0.3% 0.0% +0.0% +0.0% +0.0%
rewrite -0.3% 0.0% +0.0% -0.0% -0.0%
rfib -0.2% 0.0% +0.0% +0.0% -0.0%
rsa -0.2% 0.0% +0.0% +0.0% +0.0%
scc -0.3% 0.0% -0.0% -0.0% -0.1%
sched -0.3% 0.0% +0.0% +0.0% +0.0%
scs -0.2% 0.0% +0.1% +0.0% +0.0%
simple -0.2% 0.0% +3.4% +1.0% +1.8%
solid -0.2% 0.0% +0.0% +0.0% +0.0%
sorting -0.3% 0.0% +0.0% +0.0% +0.0%
spectral-norm -0.2% 0.0% -0.0% -0.0% -0.0%
sphere -0.2% 0.0% +0.0% +0.0% +0.0%
symalg -0.2% 0.0% +0.0% +0.0% +0.0%
tak -0.3% 0.0% +0.0% +0.0% -0.0%
transform -0.2% 0.0% +0.2% +0.1% +0.1%
treejoin -0.3% 0.0% +0.2% -0.0% -0.1%
typecheck -0.3% 0.0% +0.0% +0.0% +0.0%
veritas -0.1% 0.0% +0.0% +0.0% +0.0%
wang -0.2% 0.0% +0.0% -0.0% -0.0%
wave4main -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve1 -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve2 -0.3% 0.0% +0.0% -0.0% -0.0%
x2n1 -0.3% 0.0% +0.0% +0.0% +0.0%
--------------------------------------------------------------------------------
Min -0.3% 0.0% -0.0% -0.1% -0.2%
Max -0.1% 0.0% +5.4% +1.0% +3.9%
Geometric Mean -0.3% -0.0% +0.1% +0.0% +0.1%
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim -0.2% 0.0% +1.6% +0.4% +0.7%
constraints -0.3% 0.0% +4.3% +1.5% +2.3%
fibheaps -0.3% 0.0% +3.5% +1.2% +1.3%
fulsom -0.2% 0.0% +3.6% +1.2% +1.8%
gc_bench -0.3% 0.0% +4.1% +1.3% +2.3%
hash -0.3% 0.0% +6.6% +2.2% +3.6%
lcss -0.3% 0.0% +0.7% +0.2% +0.7%
mutstore1 -0.3% 0.0% +4.8% +1.4% +2.8%
mutstore2 -0.3% 0.0% +3.4% +1.0% +1.7%
power -0.2% 0.0% +2.7% +0.6% +1.9%
spellcheck -0.3% 0.0% +1.1% +0.4% +0.4%
--------------------------------------------------------------------------------
Min -0.3% 0.0% +0.7% +0.2% +0.4%
Max -0.2% 0.0% +6.6% +2.2% +3.6%
Geometric Mean -0.3% +0.0% +3.3% +1.0% +1.8%
Metric changes
--------------
While it sounds ridiculous, this change causes increased allocations in
the following tests. We concluded that this change can't cause a
difference in allocations and decided to land this patch. Fluctuations
in "bytes allocated" metric is tracked in #17686.
Metric Increase:
Naperian
T10547
T12150
T12234
T12425
T13035
T5837
T6048
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8038cbd96f444fdba18e8c9fb292c565738b774d">8038cbd9</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:21:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Formulate as translation between Clause Trees
We used to check `GrdVec`s arising from multiple clauses and guards in
isolation. That resulted in a split between `pmCheck` and
`pmCheckGuards`, the implementations of which were similar, but subtly
different in detail. Also the throttling mechanism described in
`Note [Countering exponential blowup]` ultimately got quite complicated
because it had to cater for both checking functions.
This patch realises that pattern match checking doesn't just consider
single guarded RHSs, but that it's always a whole set of clauses, each
of which can have multiple guarded RHSs in turn. We do so by
translating a list of `Match`es to a `GrdTree`:
```haskell
data GrdTree
= Rhs !RhsInfo
| Guard !PmGrd !GrdTree -- captures lef-to-right match semantics
| Sequence !GrdTree !GrdTree -- captures top-to-bottom match semantics
| Empty -- For -XEmptyCase, neutral element of Sequence
```
Then we have a function `checkGrdTree` that matches a given `GrdTree`
against an incoming set of values, represented by `Deltas`:
```haskell
checkGrdTree :: GrdTree -> Deltas -> CheckResult
...
```
Throttling is isolated to the `Sequence` case and becomes as easy as one
would expect: When the union of uncovered values becomes too big, just
return the original incoming `Deltas` instead (which is always a
superset of the union, thus a sound approximation).
The returned `CheckResult` contains two things:
1. The set of values that were not covered by any of the clauses, for
exhaustivity warnings.
2. The `AnnotatedTree` that enriches the syntactic structure of the
input program with divergence and inaccessibility information.
This is `AnnotatedTree`:
```haskell
data AnnotatedTree
= AccessibleRhs !RhsInfo
| InaccessibleRhs !RhsInfo
| MayDiverge !AnnotatedTree
| SequenceAnn !AnnotatedTree !AnnotatedTree
| EmptyAnn
```
Crucially, `MayDiverge` asserts that the tree may force diverging
values, so not all of its wrapped clauses can be redundant.
While the set of uncovered values can be used to generate the missing
equations for warning messages, redundant and proper inaccessible
equations can be extracted from `AnnotatedTree` by
`redundantAndInaccessibleRhss`.
For this to work properly, the interface to the Oracle had to change.
There's only `addPmCts` now, which takes a bag of `PmCt`s. There's a
whole bunch of `PmCt` variants to replace the different oracle functions
from before.
The new `AnnotatedTree` structure allows for more accurate warning
reporting (as evidenced by a number of changes spread throughout GHC's
code base), thus we fix #17465.
Fixes #17646 on the go.
Metric Decrease:
T11822
T9233
PmSeriesS
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86966d48954db4a8bd40046af259ed60aed535eb">86966d48</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:21:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Properly handle constructor-bound type variables
In https://gitlab.haskell.org/ghc/ghc/merge_requests/2192#note_246551
Simon convinced me that ignoring type variables existentially bound by
data constructors have to be the same way as value binders.
Sadly I couldn't think of a regression test, but I'm confident that this
change strictly improves on the status quo.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3fde723633d1788e4ded8c6f59eb7cef1ae95fd">c3fde723</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-25T05:21:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle local fixity declarations in DsMeta properly
`DsMeta.rep_sig` used to skip over `FixSig` entirely, which had the
effect of causing local fixity declarations to be dropped when quoted
in Template Haskell. But there is no good reason for this state of
affairs, as the code in `DsMeta.repFixD` (which handles top-level
fixity declarations) handles local fixity declarations just fine.
This patch factors out the necessary parts of `repFixD` so that they
can be used in `rep_sig` as well.
There was one minor complication: the fixity signatures for class
methods in each `HsGroup` were stored both in `FixSig`s _and_ the
list of `LFixitySig`s for top-level fixity signatures, so I needed
to take action to prevent fixity signatures for class methods being
converted to `Dec`s twice. I tweaked `RnSource.add` to avoid putting
these fixity signatures in two places and added
`Note [Top-level fixity signatures in an HsGroup]` in `GHC.Hs.Decls`
to explain the new design.
Fixes #17608. Bumps the Haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2d9ee25bce06ae51d2f1cf8df4f7422106a383">6e2d9ee2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-25T05:22:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Cmm (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b726534fa4764ad423eff9bdfb04305f330a00f">8b726534</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-01-25T05:23:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix rts allocateExec() on NetBSD
Similar to SELinux, NetBSD "PaX mprotect" prohibits marking a page
mapping both writable and executable at the same time. Use libffi
which knows how to work around it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6eb566a0cf43aefaf451f5885ca9b56686840a23">6eb566a0</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-25T05:23:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ghc-in-ghci for stack based builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1a32170a1b8e7a31c2dd28eb1b02f1375ea3998">b1a32170</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-25T05:23:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create ghci.cabal.sh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a5e4f5f7d6cef16b6b11ac8d3a269b92016ed5d">0a5e4f5f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-25T05:24:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split glasgow_exts into several files (#17316)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3e5c678851ed73897b0eb337e656ff377d242c9">b3e5c678</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-25T05:24:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Throw error on duplicate-named flavours
Throw an error if the user requests a flavour for which there is more
than one match.
Fixes #17156.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0940b59accb6926aaede045bcd5f5bdc77c7075d">0940b59a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-25T08:15:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not bring visible foralls into scope in hsScopedTvs
Previously, `hsScopedTvs` (and its cousin `hsWcScopedTvs`) pretended
that visible dependent quantification could not possibly happen at
the term level, and cemented that assumption with an `ASSERT`:
```hs
hsScopedTvs (HsForAllTy { hst_fvf = vis_flag, ... }) =
ASSERT( vis_flag == ForallInvis )
...
```
It turns out that this assumption is wrong. You can end up tripping
this `ASSERT` if you stick it to the man and write a type for a term
that uses visible dependent quantification anyway, like in this
example:
```hs
{-# LANGUAGE ScopedTypeVariables #-}
x :: forall a -> a -> a
x = x
```
That won't typecheck, but that's not the point. Before the
typechecker has a chance to reject this, the renamer will try
to use `hsScopedTvs` to bring `a` into scope over the body of `x`,
since `a` is quantified by a `forall`. This, in turn, causes the
`ASSERT` to fail. Bummer.
Instead of walking on this dangerous ground, this patch makes GHC
adopt a more hardline stance by pattern-matching directly on
`ForallInvis` in `hsScopedTvs`:
```hs
hsScopedTvs (HsForAllTy { hst_fvf = ForallInvis, ... }) = ...
```
Now `a` will not be brought over the body of `x` at all (which is how
it should be), there's no chance of the `ASSERT` failing anymore (as
it's gone), and best of all, the behavior of `hsScopedTvs` does not
change. Everyone wins!
Fixes #17687.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1132602f764ef4694b52abeaeeaa8da544915134">1132602f</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-27T10:03:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use splitLHs{ForAll,Sigma}TyInvis throughout the codebase
Richard points out in #17688 that we use `splitLHsForAllTy` and
`splitLHsSigmaTy` in places that we ought to be using the
corresponding `-Invis` variants instead, identifying two bugs
that are caused by this oversight:
* Certain TH-quoted type signatures, such as those that appear in
quoted `SPECIALISE` pragmas, silently turn visible `forall`s into
invisible `forall`s.
* When quoted, the type `forall a -> (a ~ a) => a` will turn into
`forall a -> a` due to a bug in `DsMeta.repForall` that drops
contexts that follow visible `forall`s.
These are both ultimately caused by the fact that `splitLHsForAllTy`
and `splitLHsSigmaTy` split apart visible `forall`s in addition to
invisible ones. This patch cleans things up:
* We now use `splitLHsForAllTyInvis` and `splitLHsSigmaTyInvis`
throughout the codebase. Relatedly, the `splitLHsForAllTy` and
`splitLHsSigmaTy` have been removed, as they are easy to misuse.
* `DsMeta.repForall` now only handles invisible `forall`s to reduce
the chance for confusion with visible `forall`s, which need to be
handled differently. I also renamed it from `repForall` to
`repForallT` to emphasize that its distinguishing characteristic
is the fact that it desugars down to `L.H.TH.Syntax.ForallT`.
Fixes #17688.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d0b0a367e4c6a52a17c3299439ac7de129da24">97d0b0a3</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-01-27T10:04:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Block.h compile with c++ compilers
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bada77d5882974514d85d4bd0fd4e1801dad755">4bada77d</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable two warnings for files that trigger them
incomplete-uni-patterns and incomplete-record-updates will be in -Wall at a
future date, so prepare for that by disabling those warnings on files that
trigger them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0188404ab096747f41fdf6c92fd1e312e5575dc6">0188404a</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two warnings to stage 2 build
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acae02c1ae8fe5fdb9966abc019ae98a3b2e51c3">acae02c1</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two warnings to Hadrian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf38a20eefcaaaac404a1818c3eff8273dc67dd9">bf38a20e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-31T02:46:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Call `interpretPackageEnv` from `setSessionDynFlags`
interpretPackageEnv modifies the flags by reading the dreaded package
environments. It is much less surprising to call it from
`setSessionDynFlags` instead of reading package environments as a
side-effect of `initPackages`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29c701c154cafa4844cf3c1bd4a93cacfa6b1ee1">29c701c1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-31T02:46:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor package related code
The package terminology is a bit of a mess. Cabal packages contain
components. Instances of these components when built with some
flags/options/dependencies are called units. Units are registered into
package databases and their metadata are called PackageConfig.
GHC only knows about package databases containing units. It is a sad
mismatch not fixed by this patch (we would have to rename parameters
such as `package-id <unit-id>` which would affect users).
This patch however fixes the following internal names:
- Renames PackageConfig into UnitInfo.
- Rename systemPackageConfig into globalPackageDatabase[Path]
- Rename PkgConfXX into PkgDbXX
- Rename pkgIdMap into unitIdMap
- Rename ModuleToPkgDbAll into ModuleNameProvidersMap
- Rename lookupPackage into lookupUnit
- Add comments on DynFlags package related fields
It also introduces a new `PackageDatabase` datatype instead of
explicitly passing the following tuple: `(FilePath,[PackageConfig])`.
The `pkgDatabase` field in `DynFlags` now contains the unit info for
each unit of each package database exactly as they have been read from
disk. Previously the command-line flag `-distrust-all-packages` would
modify these unit info. Now this flag only affects the "dynamic"
consolidated package state found in `pkgState` field. It makes sense
because `initPackages` could be called first with this
`distrust-all-packages` flag set and then again (using ghc-api) without
and it should work (package databases are not read again from disk when
`initPackages` is called the second time).
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/942c714830c73ac40e1c02bff37e2850c6794081">942c7148</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:46:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rename: Eliminate usage of mkVarOccUnique
Replacing it with `newSysName`. Fixes #17061.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41117d71bb58e001f6a2b6a11c9314d5b70b9182">41117d71</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:47:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Use one-shot kqueue on macOS
The underlying reason requiring that one-shot usage be disabled (#13903)
has been fixed.
Closes #15768.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01b15b835a7555c501df862b4dc8cc8eaff86afc">01b15b83</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:48:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't crash on encoding failure in print
If the user doesn't use a Unicode locale then the testsuite driver would
previously throw framework failures due to encoding failures. We now
rather use the `replace` error-handling strategy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c846618ae0f8601515683a4c7677c20c3272a50f">c846618a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-31T12:21:10+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do CafInfo/SRT analysis in Cmm
This patch removes all CafInfo predictions and various hacks to preserve
predicted CafInfos from the compiler and assigns final CafInfos to
interface Ids after code generation. SRT analysis is extended to support
static data, and Cmm generator is modified to allow generating
static_link fields after SRT analysis.
This also fixes `-fcatch-bottoms`, which introduces error calls in case
expressions in CorePrep, which runs *after* CoreTidy (which is where we
decide on CafInfos) and turns previously non-CAFFY things into CAFFY.
Fixes #17648
Fixes #9718
Evaluation
==========
NoFib
-----
Boot with: `make boot mode=fast`
Run: `make mode=fast EXTRA_RUNTEST_OPTS="-cachegrind" NoFibRuns=1`
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.0% 0.0% -0.0% -0.0% -0.0%
CSD -0.0% 0.0% -0.0% -0.0% -0.0%
FS -0.0% 0.0% -0.0% -0.0% -0.0%
S -0.0% 0.0% -0.0% -0.0% -0.0%
VS -0.0% 0.0% -0.0% -0.0% -0.0%
VSD -0.0% 0.0% -0.0% -0.0% -0.5%
VSM -0.0% 0.0% -0.0% -0.0% -0.0%
anna -0.1% 0.0% -0.0% -0.0% -0.0%
ansi -0.0% 0.0% -0.0% -0.0% -0.0%
atom -0.0% 0.0% -0.0% -0.0% -0.0%
awards -0.0% 0.0% -0.0% -0.0% -0.0%
banner -0.0% 0.0% -0.0% -0.0% -0.0%
bernouilli -0.0% 0.0% -0.0% -0.0% -0.0%
binary-trees -0.0% 0.0% -0.0% -0.0% -0.0%
boyer -0.0% 0.0% -0.0% -0.0% -0.0%
boyer2 -0.0% 0.0% -0.0% -0.0% -0.0%
bspt -0.0% 0.0% -0.0% -0.0% -0.0%
cacheprof -0.0% 0.0% -0.0% -0.0% -0.0%
calendar -0.0% 0.0% -0.0% -0.0% -0.0%
cichelli -0.0% 0.0% -0.0% -0.0% -0.0%
circsim -0.0% 0.0% -0.0% -0.0% -0.0%
clausify -0.0% 0.0% -0.0% -0.0% -0.0%
comp_lab_zift -0.0% 0.0% -0.0% -0.0% -0.0%
compress -0.0% 0.0% -0.0% -0.0% -0.0%
compress2 -0.0% 0.0% -0.0% -0.0% -0.0%
constraints -0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 -0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm2 -0.0% 0.0% -0.0% -0.0% -0.0%
cse -0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e1 -0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 -0.0% 0.0% -0.0% -0.0% -0.0%
dom-lt -0.0% 0.0% -0.0% -0.0% -0.0%
eliza -0.0% 0.0% -0.0% -0.0% -0.0%
event -0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals -0.0% 0.0% -0.0% -0.0% -0.0%
exp3_8 -0.0% 0.0% -0.0% -0.0% -0.0%
expert -0.0% 0.0% -0.0% -0.0% -0.0%
fannkuch-redux -0.0% 0.0% -0.0% -0.0% -0.0%
fasta -0.0% 0.0% -0.0% -0.0% -0.0%
fem -0.0% 0.0% -0.0% -0.0% -0.0%
fft -0.0% 0.0% -0.0% -0.0% -0.0%
fft2 -0.0% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.0% 0.0% -0.0% -0.0% -0.0%
fish -0.0% 0.0% -0.0% -0.0% -0.0%
fluid -0.1% 0.0% -0.0% -0.0% -0.0%
fulsom -0.0% 0.0% -0.0% -0.0% -0.0%
gamteb -0.0% 0.0% -0.0% -0.0% -0.0%
gcd -0.0% 0.0% -0.0% -0.0% -0.0%
gen_regexps -0.0% 0.0% -0.0% -0.0% -0.0%
genfft -0.0% 0.0% -0.0% -0.0% -0.0%
gg -0.0% 0.0% -0.0% -0.0% -0.0%
grep -0.0% 0.0% -0.0% -0.0% -0.0%
hidden -0.0% 0.0% -0.0% -0.0% -0.0%
hpg -0.1% 0.0% -0.0% -0.0% -0.0%
ida -0.0% 0.0% -0.0% -0.0% -0.0%
infer -0.0% 0.0% -0.0% -0.0% -0.0%
integer -0.0% 0.0% -0.0% -0.0% -0.0%
integrate -0.0% 0.0% -0.0% -0.0% -0.0%
k-nucleotide -0.0% 0.0% -0.0% -0.0% -0.0%
kahan -0.0% 0.0% -0.0% -0.0% -0.0%
knights -0.0% 0.0% -0.0% -0.0% -0.0%
lambda -0.0% 0.0% -0.0% -0.0% -0.0%
last-piece -0.0% 0.0% -0.0% -0.0% -0.0%
lcss -0.0% 0.0% -0.0% -0.0% -0.0%
life -0.0% 0.0% -0.0% -0.0% -0.0%
lift -0.0% 0.0% -0.0% -0.0% -0.0%
linear -0.1% 0.0% -0.0% -0.0% -0.0%
listcompr -0.0% 0.0% -0.0% -0.0% -0.0%
listcopy -0.0% 0.0% -0.0% -0.0% -0.0%
maillist -0.0% 0.0% -0.0% -0.0% -0.0%
mandel -0.0% 0.0% -0.0% -0.0% -0.0%
mandel2 -0.0% 0.0% -0.0% -0.0% -0.0%
mate -0.0% 0.0% -0.0% -0.0% -0.0%
minimax -0.0% 0.0% -0.0% -0.0% -0.0%
mkhprog -0.0% 0.0% -0.0% -0.0% -0.0%
multiplier -0.0% 0.0% -0.0% -0.0% -0.0%
n-body -0.0% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.0% 0.0% -0.0% -0.0% -0.0%
para -0.0% 0.0% -0.0% -0.0% -0.0%
paraffins -0.0% 0.0% -0.0% -0.0% -0.0%
parser -0.1% 0.0% -0.0% -0.0% -0.0%
parstof -0.1% 0.0% -0.0% -0.0% -0.0%
pic -0.0% 0.0% -0.0% -0.0% -0.0%
pidigits -0.0% 0.0% -0.0% -0.0% -0.0%
power -0.0% 0.0% -0.0% -0.0% -0.0%
pretty -0.0% 0.0% -0.3% -0.4% -0.4%
primes -0.0% 0.0% -0.0% -0.0% -0.0%
primetest -0.0% 0.0% -0.0% -0.0% -0.0%
prolog -0.0% 0.0% -0.0% -0.0% -0.0%
puzzle -0.0% 0.0% -0.0% -0.0% -0.0%
queens -0.0% 0.0% -0.0% -0.0% -0.0%
reptile -0.0% 0.0% -0.0% -0.0% -0.0%
reverse-complem -0.0% 0.0% -0.0% -0.0% -0.0%
rewrite -0.0% 0.0% -0.0% -0.0% -0.0%
rfib -0.0% 0.0% -0.0% -0.0% -0.0%
rsa -0.0% 0.0% -0.0% -0.0% -0.0%
scc -0.0% 0.0% -0.3% -0.5% -0.4%
sched -0.0% 0.0% -0.0% -0.0% -0.0%
scs -0.0% 0.0% -0.0% -0.0% -0.0%
simple -0.1% 0.0% -0.0% -0.0% -0.0%
solid -0.0% 0.0% -0.0% -0.0% -0.0%
sorting -0.0% 0.0% -0.0% -0.0% -0.0%
spectral-norm -0.0% 0.0% -0.0% -0.0% -0.0%
sphere -0.0% 0.0% -0.0% -0.0% -0.0%
symalg -0.0% 0.0% -0.0% -0.0% -0.0%
tak -0.0% 0.0% -0.0% -0.0% -0.0%
transform -0.0% 0.0% -0.0% -0.0% -0.0%
treejoin -0.0% 0.0% -0.0% -0.0% -0.0%
typecheck -0.0% 0.0% -0.0% -0.0% -0.0%
veritas -0.0% 0.0% -0.0% -0.0% -0.0%
wang -0.0% 0.0% -0.0% -0.0% -0.0%
wave4main -0.0% 0.0% -0.0% -0.0% -0.0%
wheel-sieve1 -0.0% 0.0% -0.0% -0.0% -0.0%
wheel-sieve2 -0.0% 0.0% -0.0% -0.0% -0.0%
x2n1 -0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.3% -0.5% -0.5%
Max -0.0% 0.0% -0.0% -0.0% -0.0%
Geometric Mean -0.0% -0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim -0.1% 0.0% -0.0% -0.0% -0.0%
constraints -0.0% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.0% 0.0% -0.0% -0.0% -0.0%
gc_bench -0.0% 0.0% -0.0% -0.0% -0.0%
hash -0.0% 0.0% -0.0% -0.0% -0.0%
lcss -0.0% 0.0% -0.0% -0.0% -0.0%
power -0.0% 0.0% -0.0% -0.0% -0.0%
spellcheck -0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.0% -0.0% -0.0%
Max -0.0% 0.0% -0.0% -0.0% -0.0%
Geometric Mean -0.0% +0.0% -0.0% -0.0% -0.0%
Manual inspection of programs in testsuite/tests/programs
---------------------------------------------------------
I built these programs with a bunch of dump flags and `-O` and compared
STG, Cmm, and Asm dumps and file sizes.
(Below the numbers in parenthesis show number of modules in the program)
These programs have identical compiler (same .hi and .o sizes, STG, and
Cmm and Asm dumps):
- Queens (1), andre_monad (1), cholewo-eval (2), cvh_unboxing (3),
andy_cherry (7), fun_insts (1), hs-boot (4), fast2haskell (2),
jl_defaults (1), jq_readsPrec (1), jules_xref (1), jtod_circint (4),
jules_xref2 (1), lennart_range (1), lex (1), life_space_leak (1),
bargon-mangler-bug (7), record_upd (1), rittri (1), sanders_array (1),
strict_anns (1), thurston-module-arith (2), okeefe_neural (1),
joao-circular (6), 10queens (1)
Programs with different compiler outputs:
- jl_defaults (1): For some reason GHC HEAD marks a lot of top-level
`[Int]` closures as CAFFY for no reason. With this patch we no longer
make them CAFFY and generate less SRT entries. For some reason Main.o
is slightly larger with this patch (1.3%) and the executable sizes are
the same. (I'd expect both to be smaller)
- launchbury (1): Same as jl_defaults: top-level `[Int]` closures marked
as CAFFY for no reason. Similarly `Main.o` is 1.4% larger but the
executable sizes are the same.
- galois_raytrace (13): Differences are in the Parse module. There are a
lot, but some of the changes are caused by the fact that for some
reason (I think a bug) GHC HEAD marks the dictionary for `Functor
Identity` as CAFFY. Parse.o is 0.4% larger, the executable size is the
same.
- north_array: We now generate less SRT entries because some of array
primops used in this program like `NewArrayOp` get eliminated during
Stg-to-Cmm and turn some CAFFY things into non-CAFFY. Main.o gets 24%
larger (9224 bytes from 9000 bytes), executable sizes are the same.
- seward-space-leak: Difference in this program is better shown by this
smaller example:
module Lib where
data CDS
= Case [CDS] [(Int, CDS)]
| Call CDS CDS
instance Eq CDS where
Case sels1 rets1 == Case sels2 rets2 =
sels1 == sels2 && rets1 == rets2
Call a1 b1 == Call a2 b2 =
a1 == a2 && b1 == b2
_ == _ =
False
In this program GHC HEAD builds a new SRT for the recursive group of
`(==)`, `(/=)` and the dictionary closure. Then `/=` points to `==`
in its SRT field, and `==` uses the SRT object as its SRT. With this
patch we use the closure for `/=` as the SRT and add `==` there. Then
`/=` gets an empty SRT field and `==` points to `/=` in its SRT
field.
This change looks fine to me.
Main.o gets 0.07% larger, executable sizes are identical.
head.hackage
------------
head.hackage's CI script builds 428 packages from Hackage using this
patch with no failures.
Compiler performance
--------------------
The compiler perf tests report that the compiler allocates slightly more
(worst case observed so far is 4%). However most programs in the test
suite are small, single file programs. To benchmark compiler performance
on something more realistic I build Cabal (the library, 236 modules)
with different optimisation levels. For the "max residency" row I run
GHC with `+RTS -s -A100k -i0 -h` for more accurate numbers. Other rows
are generated with just `-s`. (This is because `-i0` causes running GC
much more frequently and as a result "bytes copied" gets inflated by
more than 25x in some cases)
* -O0
| | GHC HEAD | This MR | Diff |
| --------------- | -------------- | -------------- | ------ |
| Bytes allocated | 54,413,350,872 | 54,701,099,464 | +0.52% |
| Bytes copied | 4,926,037,184 | 4,990,638,760 | +1.31% |
| Max residency | 421,225,624 | 424,324,264 | +0.73% |
* -O1
| | GHC HEAD | This MR | Diff |
| --------------- | --------------- | --------------- | ------ |
| Bytes allocated | 245,849,209,992 | 246,562,088,672 | +0.28% |
| Bytes copied | 26,943,452,560 | 27,089,972,296 | +0.54% |
| Max residency | 982,643,440 | 991,663,432 | +0.91% |
* -O2
| | GHC HEAD | This MR | Diff |
| --------------- | --------------- | --------------- | ------ |
| Bytes allocated | 291,044,511,408 | 291,863,910,912 | +0.28% |
| Bytes copied | 37,044,237,616 | 36,121,690,472 | -2.49% |
| Max residency | 1,071,600,328 | 1,086,396,256 | +1.38% |
Extra compiler allocations
--------------------------
Runtime allocations of programs are as reported above (NoFib section).
The compiler now allocates more than before. Main source of allocation
in this patch compared to base commit is the new SRT algorithm
(GHC.Cmm.Info.Build). Below is some of the extra work we do with this
patch, numbers generated by profiled stage 2 compiler when building a
pathological case (the test 'ManyConstructors') with '-O2':
- We now sort the final STG for a module, which means traversing the
entire program, generating free variable set for each top-level
binding, doing SCC analysis, and re-ordering the program. In
ManyConstructors this step allocates 97,889,952 bytes.
- We now do SRT analysis on static data, which in a program like
ManyConstructors causes analysing 10,000 bindings that we would
previously just skip. This step allocates 70,898,352 bytes.
- We now maintain an SRT map for the entire module as we compile Cmm
groups:
data ModuleSRTInfo = ModuleSRTInfo
{ ...
, moduleSRTMap :: SRTMap
}
(SRTMap is just a strict Map from the 'containers' library)
This map gets an entry for most bindings in a module (exceptions are
THUNKs and CAFFY static functions). For ManyConstructors this map
gets 50015 entries.
- Once we're done with code generation we generate a NameSet from SRTMap
for the non-CAFFY names in the current module. This set gets the same
number of entries as the SRTMap.
- Finally we update CafInfos in ModDetails for the non-CAFFY Ids, using
the NameSet generated in the previous step. This usually does the
least amount of allocation among the work listed here.
Only place with this patch where we do less work in the CAF analysis in
the tidying pass (CoreTidy). However that doesn't save us much, as the
pass still needs to traverse the whole program and update IdInfos for
other reasons. Only thing we don't here do is the `hasCafRefs` pass over
the RHS of bindings, which is a stateless pass that returns a boolean
value, so it doesn't allocate much.
(Metric changes blow are all increased allocations)
Metric changes
--------------
Metric Increase:
ManyAlternatives
ManyConstructors
T13035
T14683
T1969
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a87a565365d1724a83cd0d5c5fc3b696210c4f2">2a87a565</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-01-31T12:21:10+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A few optimizations in STG and Cmm parts:
(Guided by the profiler output)
- Add a few bang patterns, INLINABLE annotations, and a seqList in a few
places in Cmm and STG parts.
- Do not add external variables as dependencies in STG dependency
analysis (GHC.Stg.DepAnal).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bef704b6263f49c96af4553407259d36494be3f0">bef704b6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve skolemisation
This patch avoids skolemiseUnboundMetaTyVar making
up a fresh Name when it doesn't need to.
See Note [Skolemising and identity]
Improves error messsages for partial type signatures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd11042337a829da1dfbd19ca1a46feabdd23147">cd110423</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve pretty-printing for TyConBinders
In particular, show their kinds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/913287a0fa5370a2488ce560f2dfba61db51055d">913287a0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix scoping of TyCon binders in TcTyClsDecls
This patch fixes #17566 by refactoring the way we decide the final
identity of the tyvars in the TyCons of a possibly-recursive nest
of type and class decls, possibly with associated types.
It's all laid out in
Note [Swizzling the tyvars before generaliseTcTyCon]
Main changes:
* We have to generalise each decl (with its associated types)
all at once: TcTyClsDecls.generaliseTyClDecl
* The main new work is done in TcTyClsDecls.swizzleTcTyConBndrs
* The mysterious TcHsSyn.zonkRecTyVarBndrs dies altogether
Other smaller things:
* A little refactoring, moving bindTyClTyVars from tcTyClDecl1
to tcDataDefn, tcSynRhs, etc. Clearer, reduces the number of
parameters
* Reduce the amount of swizzling required.
Specifically, bindExplicitTKBndrs_Q_Tv doesn't need
to clone a new Name for the TyVarTv, and not
cloning means that in the vasly common case,
swizzleTyConBndrs is a no-op
In detail:
Rename newTyVarTyVar --> cloneTyVarTyVar
Add newTyVarTyTyVar that doesn't clone
Use the non-cloning newTyVarTyVar in
bindExplicitTKBndrs_Q_Tv
Rename newFlexiKindedTyVarTyVar
--> cloneFlexiKindedTyVarTyVar
* Define new utility function and use it
HsDecls.familyDeclName ::
FamilyDecl (GhcPass p) -> IdP (GhcPass p)
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ed6c4a0999c0025b1b024bc26171fa6d6773b3">58ed6c4a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-01T02:29:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/M32Alloc: Don't attempt to unmap non-existent pages
The m32 allocator's `pages` list may contain NULLs in the case that the
page was flushed. Some `munmap` implementations (e.g. FreeBSD's) don't
like it if we pass them NULL. Don't do that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/859db7d639da08622a76a94b85bc9b2b27b8aabc">859db7d6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-01T14:18:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve/fix -fcatch-bottoms documentation
Old documentation suggests that -fcatch-bottoms only adds a default
alternative to bottoming case expression, but that's not true. We use a
very simplistic "is exhaustive" check and add default alternatives to
any case expression that does not cover all constructors of the type. In
case of GADTs this simple check assumes all constructors should be
covered, even the ones ruled out by the type of the scrutinee.
Update the documentation to reflect this.
(Originally noticed in #17648)
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dfa94a36a564e5d092aa566d4670c7e008f152">54dfa94a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:14:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix docs for FrontendResult
Other variant was removed in ac1a379363618a6f2f17fff65ce9129164b6ef30
but docs were no changed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e63d9c07c0585b85c8fa340d30aeff0130af3f4">5e63d9c0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:15:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor HscMain.finish
I found the old control flow a bit hard to follow; I rewrote it to first
decide whether to desugar, and then use that choice when computing
whether to simplify / what sort of interface file to write.
I hope eventually we will always write post-tc interface files, which
will make the logic of this function even simpler, and continue the
thrust of this refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e580e5b8d08b02c39ca49e387882196931163bcf">e580e5b8</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not build StgCRunAsm.S for unregisterised builds
For unregisterised builds StgRun/StgReturn are implemented via a mini
interpreter in StgCRun.c and therefore would collide with the
implementations in StgCRunAsm.S.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3b0bd97cb92706b3cee38b2ec13349ca22ecf7d">e3b0bd97</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fixup! fixup! Do not build StgCRunAsm.S for unregisterised builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb629fab96fbff43f79190767731501d8642f524">eb629fab</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-04T09:29:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete some superfluous helper functions in HscMain
The driver code is some of the nastiest in GHC, and I am worried about
being able to untangle all the tech debt. In `HscMain` we have a number
of helpers which are either not-used or little used. I delete them so we
can reduce cognative load, distilling the essential complexity away from
the cruft.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c90eca550ccf89c8eb880e4428a43a9d0e8203f0">c90eca55</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-05T09:21:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Record type constraints arising from existentials in `PmCoreCt`s
In #17703 (a follow-up of !2192), we established that contrary to my
belief, type constraints arising from existentials in code like
```hs
data Ex where Ex :: a -> Ex
f _ | let x = Ex @Int 15 = case x of Ex -> ...
```
are in fact useful.
This commit makes a number of refactorings and improvements to comments,
but fundamentally changes `addCoreCt.core_expr` to record the type
constraint `a ~ Int` in addition to `x ~ Ex @a y` and `y ~ 15`.
Fixes #17703.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d3b5d5706a8fcfe724ee0a042d5f7c18880ccba">6d3b5d57</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testlib: Extend existing *_opts in extra_*_opts
Previously we'd override the existing {run,hc} opts in
extra_{run,hc}_opts, which caused flakiness in T1969, see #17712.
extra_{run,hc}_opts now extends {run,hc} opts, instead of overriding.
Also we shrank the allocation area for T1969 in order to increase
residency sampling frequency.
Fixes #17712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c89a48dd88b566a23b670ce707208e8c4cf28c1">9c89a48d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove CafInfo-related code from STG lambda lift pass
After c846618ae0 we don't have accurate CafInfos for Ids in the current
module and we're free to introduce new CAFFY or non-CAFFY bindings or
change CafInfos of existing binders; so no we no longer need to
maintain CafInfos in Core or STG passes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70ddb8bf3066a2e70cffb49b100b640830bec7e1">70ddb8bf</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-05T09:23:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17773
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8004e5d1e993363a89b0107380604c5bc02be6b">e8004e5d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-05T13:55:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows builds to fail again
Due to T7702 and the process issues described in #17777.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29b72c00a692b442605b022fcc15c4454ed1c3de">29b72c00</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">VarSet: Introduce nonDetFoldVarSet
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4e6b35daef9336ea6b0922bab595cb02ac742b5">c4e6b35d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move closeOverKinds and friends to TyCoFVs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed2f0e5c38f1dfc9cf049ae63c56117cda99116e">ed2f0e5c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reform the free variable finders for types
This patch delivers on (much of) #17509.
* Introduces the shallow vs deep free variable distinction
* Introduce TyCoRep.foldType,
foldType :: Monoid a => TyCoFolder env a
-> env -> Type -> a
and use it in the free variable finders.
* Substitution in TyCoSubst
* ASSERTs are on for checkValidSubst
* checkValidSubst uses shallowTyCoVarsOfTypes etc
Quite a few things still to do
* We could use foldType in lots of other places
* We could use mapType for substitution. (Check that we get
good code!)
* Some (but not yet all) clients of substitution can now
save time by using shallowTyCoVarsOfTypes
* All calls to tyCoVarsOfTypes should be inspected; most of
them should be shallow. Maybe.
* Currently shallowTyCoVarsOfTypes still returns
unification variables, but not CoVarHoles.
Reason: we need to return unification variables
in some of the calls in TcSimplify, eg when promoting.
* We should do the same thing for tyCoFVsOfTypes, which is
currently unchanged.
* tyCoFVsOfTypes returns CoVarHoles, because of the
use in TcSimplify.mkResidualConstraints. See
Note [Emitting the residual implication in simplifyInfer]
* #17509 talks about "relevant" variables too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01a1f4fbb1bb62ed621421622f6a15d30c91b3c3">01a1f4fb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for noFreeVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e59afd66788fc704999d1987cd351fa165d3c46">0e59afd6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify closeOverKinds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ca5c88e6370c2cafed6b63fe217f70e87d7fcea">9ca5c88e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for coVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5541b87c498cdd320e9a18d2134e571d713536e1">5541b87c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for exactTyCoVarsOfType
This entailed
* Adding a tcf_view field to TyCoFolder
* Moving exactTyCoVarsOtType to TcType. It properly belongs
there, since only the typechecker calls this function. But
it also means that we can "see" and inline tcView.
Metric Decrease:
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c1228511f2dd4d262c04edb8539174a7de810b2">7c122851</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:56:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/588acb99bc3cb377ceb76447dd60656b4a11de5a">588acb99</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-08T10:15:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">slightly better named cost-centres for simple pattern bindings #17006
```
main = do
print $ g [1..100] a
where g xs x = map (`mod` x) xs
a :: Int = 324
```
The above program previously attributed the cost of computing 324 to a cost
centre named `(...)`, with this change the cost is attributed to `a` instead.
This change only affects simple pattern bindings (decorated variables: type
signatures, parens, ~ annotations and ! annotations).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/309f8cfdad9cf81f5ee6003821810ea1205ae1d5">309f8cfd</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unnecessary parentheses
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7755ffc2920facb7ed74efe379ad825feeaf1024">7755ffc2</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce IsPass; refactor wrappers.
There are two main payloads of this patch:
1. This introduces IsPass, which allows e.g. printing
code to ask what pass it is running in (Renamed vs
Typechecked) and thus print extension fields. See
Note [IsPass] in Hs.Extension
2. This moves the HsWrap constructor into an extension
field, where it rightly belongs. This is done for
HsExpr and HsCmd, but not for HsPat, which is left
as an exercise for the reader.
There is also some refactoring around SyntaxExprs, but this
is really just incidental.
This patch subsumes !1721 (sorry @chreekat).
Along the way, there is a bit of refactoring in GHC.Hs.Extension,
including the removal of NameOrRdrName in favor of NoGhcTc.
This meant that we had no real need for GHC.Hs.PlaceHolder, so
I got rid of it.
Updates haddock submodule.
-------------------------
Metric Decrease:
haddock.compiler
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d452be454857549679b93a0682a3f6fedf5d7c1">7d452be4</a></strong>
<div>
<span>by Dylan Yudaken</span>
<i>at 2020-02-08T10:17:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix hs_try_putmvar losing track of running cap
If hs_try_putmvar was called through an unsafe import, it would lose track of the running cap causing a deadlock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2e301aeeae353a64be43e5fa9e7d464797d5648">c2e301ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Qualify imports of Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aede171a59f9b7b8022548c385a1cb8c4589f905">aede171a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix -Wcompat-unqualified-imports issues
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4435a8e0b74337fe5faddb9c46691f0f5bf9e653">4435a8e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce -Wcompat-unqualified-imports
This implements the warning proposed in option (B) of the
Data.List.singleton CLC [discussion][].
This warning, which is included in `-Wcompat` is intended to help users
identify imports of modules that will change incompatibly in future GHC
releases. This currently only includes `Data.List` due to the expected
specialisation and addition of `Data.List.singleton`.
Fixes #17244.
[discussion]: https://groups.google.com/d/msg/haskell-core-libraries/q3zHLmzBa5E/PmlAs_kYAQAJ
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28b5349a1ae88872e343c58c270fe90329f14d87">28b5349a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump stm and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d04b9f298c9cc0ff291e0717826743f488670bb">7d04b9f2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:18:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow override of Cabal configuration in hadrian.settings
Fixes #17612 by adding a `cabal.configure.opts` key for
`hadrian.settings`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88bf81aaaf67e9c9bb5b12088ab33accd4a55fb3">88bf81aa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:19:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize unpackCString# to allocate less.
unpackCString# is a recursive function which for each iteration
returns a Cons cell containing the current Char, and a thunk for
unpacking the rest of the string.
In this patch we change from storing addr + offset inside this thunk
to storing only the addr, simply incrementing the address on each
iteration.
This saves one word of allocation per unpacked character.
For a program like "main = print "<largishString>" this amounts
to 2-3% fewer % in bytes allocated.
I also removed the now redundant local unpack definitions.
This removes one call per unpack operation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bec76733b818b0489ffea0834ab6b1560207577c">bec76733</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:19:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GhcThreaded setting
This adopts a patch from NetBSD's packaging fixing the `GhcThreaded`
option of the make build system. In addition we introduce a `ghcThreaded`
option in hadrian's `Flavour` type.
Also fix Hadrian's treatment of the `Use Threaded` entry in `settings`.
Previously it would incorrectly claim `Use Threaded = True` if we were
building the `threaded` runtime way. However, this is inconsistent with
the `make` build system, which defines it to be whether the `ghc`
executable is linked against the threaded runtime.
Fixes #17692.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/545cf1e184a37295245086040750d77a809db16e">545cf1e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:20:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Depend upon libray dependencies when configuring packages
This will hopefully fix #17631.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/047d3d75b2861e6dd3c0ba21daf50b012e5a7fd3">047d3d75</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:21:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #15316
This is the full testcase for T15316.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/768e58664ffd408e5c4e3bea8f00a650cd0c6501">768e5866</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(Data.List): Add some examples to Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3900cb83fb10b0209fb5fb1d713bf3aaf3ee42b8">3900cb83</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/GHC/List.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd6667665f160f07550b25e9c80fbc197ae2f642">bd666766</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify that bundled patsyns were introduced in GHC 8.0
Closes #17094.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95741ea1f93c6d9bac055eb620c8bcda0ec5c72d">95741ea1</a></strong>
<div>
<span>by Pepe Iborra</span>
<i>at 2020-02-08T10:23:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update to hie-bios 0.3.2 style program cradle
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5c19122ea59d1c6758762cb47e1a451bc3b9bf">fb5c1912</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-08T10:24:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant case
This alternative is redundant and triggers no warning when building with 8.6.5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d83d9489f383cc940ce123d9385c5cad1af517d">5d83d948</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-08T10:24:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add mkHieFileWithSource which doesn't read the source file from disk
cc/ @pepeiborra
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dfdae56d2ea9b9841e747c36cdff63a826045805">dfdae56d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:25:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghcAssert to stgAssert in hp2ps/Main.h.
This fixes #17763</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/658f7ac67472a880e19397773edd35a6214ed995">658f7ac6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:26:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">includes: Avoid using single-line comments in HsFFI.h
While single-line comments are supported by C99, dtrace on SmartOS
apparently doesn't support them yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c95920a6371768276e439811e99f4822571ff4df">c95920a6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:26:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Import qualified Prelude in parser
This is in preparation of backwards-incompatible changes in happy.
See https://github.com/simonmar/happy/issues/166
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6dc319a2d83a8a8c426d0ad6f46d0b8fad41253">b6dc319a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:27:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12760
The bug seems to be fixed in the meantime, make sure it stays fixed.
Closes #12760
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3857b62cb74ef50cbe88ab898aae946ca933365">b3857b62</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:28:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Drop out-of-date comment
The comment in GHC.Base claimed that ($) couldn't be used in that module
as it was wired-in. However, this is no longer true; ($) is merely known
key and is defined in Haskell (with a RuntimeRep-polymorphic type) in
GHC.Base.
The one piece of magic that ($) retains is that it a special typing
rule to allow type inference with higher-rank types
(e.g. `runST $ blah`; see Note [Typing rule for ($)] in TcExpr).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1183ae94a256b30bfe12ddc5e1c29d6f46abd79d">1183ae94</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix Arena blocks accounting for MBlock sized allocations
When requesting more than BLOCKS_PER_MBLOCK blocks allocGroup can return a
different number of blocks than requested. Here we use the number of
requested blocks, however arenaFree will subtract the actual number of
blocks we got from arena_blocks (possibly) resulting in a negative value
and triggering ASSERT(arena_blocks >= 0).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d59db55e3b32861d91783c36d56e5c93f2cd19">97d59db5</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix need_prealloc being reset when retainer profiling is on
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f630025d457807c4a9da513e4a0823e4643b2a6">1f630025</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-09T02:52:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #15712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ac784ab381aae936ee3be7c8685e0203ee4dbf6">2ac784ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --test-metrics argument
Allowing the test metric output to be captured to a file, a la
the METRIC_FILE environment variable of the make build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f432d8c64058d3d00d917f0bc65feb1bf9f7aecb">f432d8c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix --test-summary argument
This appears to be a cut-and-paste error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a906595f060b9c038332f16adaf664eeb1d50f2e">a906595f</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2020-02-09T02:53:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an outdated note link
This link appears to have been forgotten in
0dad81ca5fd1f63bf8a3b6ad09787559e8bd05c0 .
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ae83da13f03d22a4d810b5d9c0f37f818cb6a00">3ae83da1</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-09T02:54:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Windows fixes (bindists, CI)
This commit implements a few Windows-specific fixes which get us from a CI
job that can't even get as far as starting the testsuite driver, to a state
where we can run the entire testssuite (but have test failures to fix).
- Don't forget about a potential extension for the haddock program, when
preparing the bindist.
- Build the timeout program, used by the testsuite driver on Windows in place
of the Python script used elsewhere, using the boot compiler. We could
alternatively build it with the compiler that we're going to test but this
would be a lot more tedious to write.
- Implement a wrapper-script less installation procedure for Windows, in
`hadrian/bindist/Makefile.
- Make dependencies a bit more accurate in the aforementioned Makefile.
- Update Windows/Hadrian CI job accordingly.
This patch fixes #17486.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82f9be8c6aafb70f612e72bef517c76437726c78">82f9be8c</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-09T02:55:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #14628: Panic (No skolem Info) in GHCi
This patch implements the [sugggestion from Simon (PJ)](https://gitlab.haskell.org/ghc/ghc/issues/14628#note_146559):
- Make `TcErrors.getSkolemInfo` return a `SkolemInfo` rather than an `Implication`.
- If `getSkolemInfo` gets `RuntimeUnk`s, just return a new data constructor in `SkolemInfo`, called `RuntimeUnkSkol`.
- In `TcErrors.pprSkols` print something sensible for a `RuntimeUnkSkol`.
The `getSkolemInfo` function paniced while formating suggestions to add type annotations (subfunction `suggestAddSig`)
to a *"Couldn't match type ‘x’ with ‘y’"* error message.
The `getSkolemInfo` function didn't find any Implication value and paniced.
With this patch the `getSkolemInfo` function does no longer panic, if it finds `RuntimeUnkSkol`s.
As the panic occured while processing an error message, we don't need to implement any new error message!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2e18e26c34424ab814453a73404429cdf1a4d4a">b2e18e26</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-09T02:55:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -ddump-stg-final.
Once again make sure this dumps the STG used for codegen.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/414e2f626321f8eba8b2d5cc38dcc1a528351d83">414e2f62</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-09T02:56:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Force -fPIC for intree GMP (fix #17799)
Configure intree GMP with `--with-pic` instead of patching it. Moreover
the correct patching was only done for x86_64/darwin (see #17799).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0fd72ee042aa011af7d870febcfead01a424370">f0fd72ee</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-09T17:22:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for improvements to the pattern-match checker [skip ci]
A little late to the game, but better late than never.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00dc0f7e66a18ab50931325cb6333a2bfd2a6650">00dc0f7e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-09T17:23:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #13142
Closes #13142
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3e737bbcae7290856450ff9c8b0c7e31fca0c10">f3e737bb</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-10T20:04:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix long distance info for record updates
For record updates where the `record_expr` is a variable, as in #17783:
```hs
data PartialRec = No
| Yes { a :: Int, b :: Bool }
update No = No
update r@(Yes {}) = r { b = False }
```
We should make use of long distance info in
`-Wincomplete-record-updates` checking. But the call to `matchWrapper`
in the `RecUpd` case didn't specify a scrutinee expression, which would
correspond to the `record_expr` `r` here. That is fixed now.
Fixes #17783.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5670881d7779ecd7eee8c969dab66ee343298532">5670881d</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-10T20:05:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fs: Fix UNC remapping code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/375b3c45be0e5de673d03097ebbad442c85c89eb">375b3c45</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-11T05:07:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to Data.OldList
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de32beffde82eec954691703541a2d4081799453">de32beff</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-11T05:08:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not create nested quantified constraints
Previously, we would accidentally make constraints like
forall a. C a => forall b. D b => E a b c as we traversed
superclasses. No longer!
This patch also expands Note [Eagerly expand given superclasses]
to work over quantified constraints; necessary for T16502b.
Close #17202 and #16502.
test cases: typecheck/should_compile/T{17202,16502{,b}}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e319570ec141e0f63d82d23b88a40f96fc0b7105">e319570e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use nanosleep instead of usleep
usleep was removed in POSIX.1-2008.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b75e7486de73868e6821a9f680e9e13794dff15c">b75e7486</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:09:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove incorrect assertions around MSG_THROWTO messages
Previously we would assert that threads which are sending a
`MSG_THROWTO` message must have their blocking status be blocked on the
message. In the usual case of a thread throwing to another thread this
is guaranteed by `stg_killThreadzh`. However, `throwToSelf`, used by
the GC to kill threads which ran out of heap, failed to guarantee this.
Noted while debugging #17785.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aba51b65863db5f2687f29d10ba24ffa49dabd3b">aba51b65</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-11T05:10:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add arithmetic exception primops (#14664)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b157399f987c31574968719a52a5b00f2acfb36a">b157399f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:10:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Don't assume Gnu linker on Solaris
Compl Yue noticed that the linker was dumping the link map on SmartOS. This is
because Smartos uses the Solaris linker, which uses the `-64` flag, not
`-m64` like Gnu ld, to indicate that it should link for 64-bits. Fix the
configure script to handle the Solaris linker correctly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8d73d779e615ae352934864a347222f175ca277">d8d73d77</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-11T05:11:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Notes only: telescopes
This documentation-only patch fixes #17793
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a4ddeff7730d160dd66f19c288f8b5b27679e3">58a4ddef</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-11T05:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build (and ship) iserv on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82023524ff050f26bf00be3432a97f1e537caf41">82023524</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-11T18:04:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TemplateHaskellQuotes: Allow nested splices
There is no issue with nested splices as they do not require any compile
time code execution. All execution is delayed until the top-level
splice.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50e24eddbac3d3b34003ad985fe6126aa0f83e0f">50e24edd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-11T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Hadrian's copy of (Data.Functor.<&>)
The function was added to base with base-4.11 (GHC 8.4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82a2f90ceda5c2bc74088fa7f6a7c8cb9c9756f">f82a2f90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:56:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document GMP build [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da7f74797e8c322006eba385c9cbdce346dd1d43">da7f7479</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:57:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: ByteCode and Runtime (cf #13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04f51297e3d7bcf7be0dc7db4673cc3e6f9156ea">04f51297</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix naming of tests for #12923
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31fc332191a6298e2643261482e9b43a4b38241b">31fc3321</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12926
Closes #12926
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0c0ee7d9a942a19361e72553cd08f42cc12b04a">f0c0ee7d</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T01:58:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix order of arguments in specializer (#17801)
See https://gitlab.haskell.org/ghc/ghc/issues/17801#note_253330
No regression test, as it's hard to trigger.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/059c3c9d7c84fc37c69e9f414ff736d47081e72c">059c3c9d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-12T11:00:58+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Separate CPR analysis from the Demand analyser
The reasons for that can be found in the wiki:
https://gitlab.haskell.org/ghc/ghc/wikis/nested-cpr/split-off-cpr
We now run CPR after demand analysis (except for after the final demand
analysis run just before code gen). CPR got its own dump flags
(`-ddump-cpr-anal`, `-ddump-cpr-signatures`), but not its own flag to
activate/deactivate. It will run with `-fstrictness`/`-fworker-wrapper`.
As explained on the wiki page, this step is necessary for a sane Nested
CPR analysis. And it has quite positive impact on compiler performance:
Metric Decrease:
T9233
T9675
T9961
T15263
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5ffd8d9ec776db708e690c4fdbf671afa8df48f">f5ffd8d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Expose GHC.Unicode.unicodeVersion
This exposes a Data.Version.Version representing the version of the
Unicode database used by `base`. This should clear up some confusion I
have seen in tickets regarding with which Unicode versions a given GHC
can be expected to work.
While in town I also regenerated (but did not update) the Unicode
database with database 12.0.0. Strangely, the file cited in the README
no longer existed. Consequently, I used
https://www.unicode.org/Public/12.0.0/ucd/UnicodeData.txt and was
slightly surprised to find that there were a few changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c2585e0816cb49487fa6a2be5b8e3f191cf3438">6c2585e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Update Unicode database to 12.1.0
Using `curl https://www.unicode.org/Public/12.1.0/ucd/UnicodeData.txt |
libraries/base/cbits/ubconfc 12.1.0`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df08468113ab46832b7ac0a7311b608d1b418c4d">df084681</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T23:58:52+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always display inferred variables using braces
We now always show "forall {a}. T" for inferred variables,
previously this was controlled by -fprint-explicit-foralls.
This implements part 1 of https://github.com/ghc-proposals/ghc-proposals/pull/179.
Part of GHC ticket #16320.
Furthermore, when printing a levity restriction error, we now display
the HsWrap of the expression. This lets users see the full elaboration with
-fprint-typechecker-elaboration (see also #17670)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/16d643cfe661716c7a6cb3ce04893a732c5a42af">16d643cf</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -ddump-srts flag
This flag is deemed not useful.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa28ae95e4c1ff5b70bf3f8dc6e54fb994bbfa51">fa28ae95</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix flag documentation (#17826)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bfd825943f6077836361ddc788fb40f2421e283">1bfd8259</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ensure that Hadrian is built correctly before using it
When Hadrian failed to build, the script would pick a previously built
Hadrian (if available) instead of failing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd6e786a28cc6688b45c8868a3e8a338b081ba01">cd6e786a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-14T05:29:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17648
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f2c3677b3a08d8ea6c0d1f5fd51e43b7fcfe75b">9f2c3677</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:30:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GMP expects the Target platform as --host parameter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa6086fdf53aef690369771def6cf1c31faa38e8">aa6086fd</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-14T05:31:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add explicit LANGUAGE Safe to template-haskell
(cherry picked from commit a5e0f376821ca882880b03b07b451aa574e289ec)</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af6a0c36431639655762440ec8d652796b86fe58">af6a0c36</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T05:31:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add execution and target architecture to stage-compilation figure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf739945b8b28ff463dc44925348f20b3c1f22cb">cf739945</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:32:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: HsToCore (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/719db3180e3fb0fa95fcfc90feb51ffbb2a2096d">719db318</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-14T05:33:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">De-duplicate overlapping Notes
Documentation only. Fixes #17827
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7550417ac866e562bb015149d8f9a6b8c97b5f84">7550417a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:33:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: drop Sphinx flag checking for PDF documentation (#17825)
It seems that Sphinx produces the ghc-flags.txt in
doc/users_guide/_build rather than pdfRoot. We could copy ghc-flags.txt
into pdfRoot (like happens naturally in the HTML case) but the benefit
is pretty small. Let's just only check the HTML case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/813842f42023457ccb4d93b5906e0f492e4721b2">813842f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Be more selective in building windows-extra-src tarball
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0725f4bbc7f59282ee5fe41619099957030d85ff">0725f4bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rework handling of win32 toolchain tarballs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/565ce7aee5db966070f9d0267f99a13532d5caf0">565ce7ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Consolidate CI logic
This moves nearly all of the CI logic to .gitlab/ci.sh. This improves
things in a number of ways:
* it's harder for inconsistencies to arise between architectures
* it's easier to share logic between architectures
* on Windows, it's easier to ensure that all CI steps are executed from
within a properly initialized mingw session.
While in town I also add a FreeBSD build job and update the Windows job
to use the gitlab-runner PowerShell executor, since cmd.exe will be
deprecated soon (fixing #17699).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9cbace74dadf6fe64267f0b68635402f5c848b72">9cbace74</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Deduplicate nightly job configuration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e8371442dc6130a03e648a0e1bc0f1bdfdbfe91">6e837144</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Fix unused command-line argument
-L is only needed during linking.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5ee07ab565c1bf7a33d3bd4bcd3fb6c7b100d1c">e5ee07ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't ask sed to operate in-place on symlinks
Some sed implementations (e.g. FreeBSD) refuse to operate in-place on
symlinks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71e5e68fd3794cc63f513d30d467e43761a8ce62">71e5e68f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable tests that assume name of libstdc++ on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2da0f429f45ad2d945b4b041e1d58477ce7567">7b2da0f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T6132 as broken on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ef7a15a0c59b4ceff7f6343cabca8497c0eef50">8ef7a15a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/T16930: Don't rely on gnu grep specific --include
In BSD grep this flag only affects directory recursion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6060003e4f95101adaef0b2c7f26154c59f2e83a">6060003e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass -Wno-unused-command-line-arguments during link on FreeBSD
FreeBSD cc throws a warning if we pass -pthread without actually using
any pthread symbols.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97497baeb70c443030e9e0c59abf4930679b4f82">97497bae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Always clamp reads/writes to 2GB in length
Previously we did this only on Darwin due to #17414. However, even on
other platforms >2GB writes are on shaky ground. POSIX explicitly says
that the result is implementation-specified and Linux will write at most
0x7ffff000, even on 64-bit platforms. Moreover, getting the sign
of the syscall result correct is tricky, as demonstrated by the fact
that T17414 currently fails on FreeBSD.
For simplicity we now just uniformly clamp to 0x7ffff000 on all
platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49be2a3fc5e9f6ca71717cde6889c49dbba816da">49be2a3f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix sphinx version test
The check for the "v" prefix is redundant.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7f7a556f9b89303da4e1c3475e618653d830cc4">f7f7a556</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix unknown link targets
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a204102c634743faac8af345ad8bfec6317e7024">a204102c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/compare-flags: Don't use python f-strings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92e15a379a675f14667d7b80db608c84e58aa0a8">92e15a37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix various shellcheck warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459f7c6e29eed46f8a5be8fac02c45450080a67c">459f7c6e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop empty arguments from target list
Fixes #17748.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c06df28dd490d0309e0b1885a6121b45f74edf3c">c06df28d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix "invalid file" failure
I have no idea how this worked previously. Different Python version?
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3fe8444f7e3904be14956f3fe68583da8b730ab4">3fe8444f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T7702 as fragile on Windows
Due to #16799. There was previously an attempt to mark it as broken but
the `opsys` name was incorrect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe02f78172f06fd3e83ba00246d9ed741474e653">fe02f781</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Assert the opsys names are known
Previously opsys would take any string. This meant it was very easy for
a typo to silently render the predicate ineffective. Fix this by
checking the given operating system name against a list of known values.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/149e2a3a85d92b4afea1643e7e6ed7861d620be2">149e2a3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Don't rely on encoding flag of subprocess.check_output
Apparently it isn't supported by some slightly older Python versions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/798d59f6a2b517db50ec2536a8331d610a2b379c">798d59f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add more debug output to failed path in onIOComplete
This will help track down #17035.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e35f3f98b085a6bd925bef1b97f81a3117358e8c">e35f3f98</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow i386 Windows builds to fail again
Due to the resistance of #17736 to resolution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/261a3cf83b757f6422acafa6e436ea7bb05ff532">261a3cf8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Build integer-simple job in the validate flavour
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b613a961be70e75747816be4d7642b6378a84c3f">b613a961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always use mingw64 python on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bc8c8cd02726c5151afdb02a019aec724be8bec">1bc8c8cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows build to fail due to #17777
The fact that `exec` isn't POSIX compliant means that things can break
in arbitrarily bad ways. Sometimes things happen to work correctly but
sadly this isn't always the case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac63020d3c9960d12efef54003dd088f8ec0413b">ac63020d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop unnecessary GHC_VERSION check
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6926f369b8740c1c8095eb0786010d9da9c5fcfd">6926f369</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Folds in the second part of Phyx's Windows process exit fixes [1],
hopefully finally resolving issue #17480.
[1] https://github.com/haskell/process/pull/160
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/584eee71f803ebf59f12758755151110a6e8636f">584eee71</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Use "process job" when spawning processes on Windows
GHC should make calls using process jobs when calling out to GCC and LD.
The reason is these use the exec () family of posix functions. Window's
process model doesn't allow replacement of processes so this is emulated
by creating a new process and immediately exiting the old one. Because
of this when using normal Windows wait functions you would return even
without the child process having finished. In this case if you are
depending on data from the child you will enter a race condition.
The usual fix for this is to use process jobs and wait for the
termination of all children that have ever been spawn by the process you
called. But also waiting for the freeing of all resources.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecabfa28518947d752403bc1b59ee716652687da">ecabfa28</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "compiler: Disable atomic renaming on Windows"
The original reason this was disabled should be fixed by the previous
commit.
This reverts commit 1c1b63d63efe8b0f789aa7d5b87cfac3edd213eb.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06d60c66d6355e895c7e46275f295b721d63fa92">06d60c66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cabb384775adacf8326f7dd2cf99291da8dddbb">8cabb384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Fix output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cf646d36b02b8ea1c289cb52781c9171853b514">8cf646d3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document -ddump-srts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932307a5486e63335f9ee6dc183ff39f6dfc5857">932307a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix broken reference
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e77818de9cc9b2bc4b19dba4bc479f14078760b7">e77818de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:26:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept performance changes
These manifested in the integer-simple job.
Metric Decrease:
T12227
T5549
T14936
T4830
Conversions
T5237
T8766
T4801
T10359
Metric Increase:
T12234
T6048
T3294
T14683
T3064
T9872b
T9872c
T783
T5837
T10678
T14697
T5631
T9203
T13719
T12707
T13056
T9630
T10547
T9872d
T1969
WWRec
T10370
T5321FD
haddock.Cabal
T5642
T9872a
T15263
T12425
MultiLayerModules
T5205
T9233
T13379
haddock.base
T9020
T13035
T12150
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/785008c1235bd77ddb4d13f57f92b249752d8ea5">785008c1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:30:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Sort test names in expected change output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e851472e59950c9d7ada3224a5bf317c0a9dc1a">9e851472</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-16T10:38:41+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "users-guide: Document -ddump-srts"
This reverts commit 8cf646d36b02b8ea1c289cb52781c9171853b514.
The flag was removed by 16d643cf.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9792c81663d8bef3abfe22cf45405d8d282afe08">9792c816</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-16T09:47:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Probe whether symlinks are usable on Windows
Closes #17706.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee1e5342f612c8b06ac910cd698558ade7a1a887">ee1e5342</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-16T09:47:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the "unused terminals: 2" warning in Parser.y
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4a8ce525fce56eca18358820c0ec35fec8982de">b4a8ce52</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-18T20:14:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">If a :reload finds syntax errors in the module graph, remove the loaded modules. (Fixes #17549)
The processing in `compiler/main/GhcMake.hs` computes the ModuleGraph. If it finds errors
in the module header or in the import specifications, then the new module graph is
incomplete and should not be used.
The code before #17549 just reported the errors and left the old ModuleGraph in place.
The new code of this MR replaces the old ModuleGraph with an empty one.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7029cc09edc052c2f97effe33233c53340fcce0">d7029cc0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:15:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: refactor GMP in-tree build support (#17756)
* Hadrian doesn't use integer-gmp/config.mk file anymore to determine if
building GMP in-tree is required.
"config.mk" is created by Cabal when the integer-gmp package is
configured and this file is still untracked by Hadrian. This led to a
tricky configure "race" because "config.mk" is built by the
"setup-config" rule, but this rule is also used to find dependencies,
in particular the "ghc-gmp.h" header, but the creation of this file
was depending (without being tracked) on "config.mk".
Now Hadrian only builds in-tree GMP if `--with-intree-gmp` is passed
to the top-level configure script.
* in-tree GMP isn't built once for all in a fixed stage (Stage1)
anymore. It is built per stage which is required if we build a
cross-compiler
* switching between in-tree and external GMP is now supported without
having to clean the build directory first.
* "wrappers.c" now includes "ghc-gmp.h" instead of "ghc.h". It
helps ensuring that the build system generates "ghc-gmp.h".
* build in-tree GMP in "<root>/stageN/gmp/gmpbuild" and produce useful
artefacts (libgmp.a, gmp.h, objs/*.o) in "<root>/stageN/gmp"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40d917fb3b99bdb63e7e39d517225d441aaf722d">40d917fb</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:16:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the MonadFail P instance
There were two issues with this instance:
* its existence meant that a pattern match failure in the P monad would
produce a user-visible parse error, but the error message would not be
helpful to the user
* due to the MFP migration strategy, we had to use CPP in Lexer.x,
and that created issues for #17750
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a1ce45d6cf03802caf15548210bb9924468c437">5a1ce45d</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-02-18T20:16:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix unboxed tuple size limit (#17837)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/192caf58ca1fc42806166872260d30bdb34dbace">192caf58</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:17:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite driver output (#17847)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1500f0898e85316c7c97a2f759d83278a072ab0e">1500f089</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:18:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Llvm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d53e81c02c64e72ccb55bf73f0881c5c80fa50ef">d53e81c0</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:36:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for atomic .o writes [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19680ee533bb95c0c5c42aca5c81197e4b233979">19680ee5</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:37:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for --disable-delayed-os-memory-return [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74ad75e87317196c600dfabc61aee1b87d95c214">74ad75e8</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-20T21:17:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-implement unsafe coercions in terms of unsafe equality proofs
(Commit message written by Omer, most of the code is written by Simon
and Richard)
See Note [Implementing unsafeCoerce] for how unsafe equality proofs and
the new unsafeCoerce# are implemented.
New notes added:
- [Checking for levity polymorphism] in CoreLint.hs
- [Implementing unsafeCoerce] in base/Unsafe/Coerce.hs
- [Patching magic definitions] in Desugar.hs
- [Wiring in unsafeCoerce#] in Desugar.hs
Only breaking change in this patch is unsafeCoerce# is not exported from
GHC.Exts, instead of GHC.Prim.
Fixes #17443
Fixes #16893
NoFib
-----
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.1% 0.0% -0.0% -0.0% -0.0%
CSD -0.1% 0.0% -0.0% -0.0% -0.0%
FS -0.1% 0.0% -0.0% -0.0% -0.0%
S -0.1% 0.0% -0.0% -0.0% -0.0%
VS -0.1% 0.0% -0.0% -0.0% -0.0%
VSD -0.1% 0.0% -0.0% -0.0% -0.1%
VSM -0.1% 0.0% -0.0% -0.0% -0.0%
anna -0.0% 0.0% -0.0% -0.0% -0.0%
ansi -0.1% 0.0% -0.0% -0.0% -0.0%
atom -0.1% 0.0% -0.0% -0.0% -0.0%
awards -0.1% 0.0% -0.0% -0.0% -0.0%
banner -0.1% 0.0% -0.0% -0.0% -0.0%
bernouilli -0.1% 0.0% -0.0% -0.0% -0.0%
binary-trees -0.1% 0.0% -0.0% -0.0% -0.0%
boyer -0.1% 0.0% -0.0% -0.0% -0.0%
boyer2 -0.1% 0.0% -0.0% -0.0% -0.0%
bspt -0.1% 0.0% -0.0% -0.0% -0.0%
cacheprof -0.1% 0.0% -0.0% -0.0% -0.0%
calendar -0.1% 0.0% -0.0% -0.0% -0.0%
cichelli -0.1% 0.0% -0.0% -0.0% -0.0%
circsim -0.1% 0.0% -0.0% -0.0% -0.0%
clausify -0.1% 0.0% -0.0% -0.0% -0.0%
comp_lab_zift -0.1% 0.0% -0.0% -0.0% -0.0%
compress -0.1% 0.0% -0.0% -0.0% -0.0%
compress2 -0.1% 0.0% -0.0% -0.0% -0.0%
constraints -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm2 -0.1% 0.0% -0.0% -0.0% -0.0%
cse -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e1 -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 -0.1% 0.0% -0.0% -0.0% -0.0%
dom-lt -0.1% 0.0% -0.0% -0.0% -0.0%
eliza -0.1% 0.0% -0.0% -0.0% -0.0%
event -0.1% 0.0% -0.0% -0.0% -0.0%
exact-reals -0.1% 0.0% -0.0% -0.0% -0.0%
exp3_8 -0.1% 0.0% -0.0% -0.0% -0.0%
expert -0.1% 0.0% -0.0% -0.0% -0.0%
fannkuch-redux -0.1% 0.0% -0.0% -0.0% -0.0%
fasta -0.1% 0.0% -0.5% -0.3% -0.4%
fem -0.1% 0.0% -0.0% -0.0% -0.0%
fft -0.1% 0.0% -0.0% -0.0% -0.0%
fft2 -0.1% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.1% 0.0% -0.0% -0.0% -0.0%
fish -0.1% 0.0% -0.0% -0.0% -0.0%
fluid -0.1% 0.0% -0.0% -0.0% -0.0%
fulsom -0.1% 0.0% +0.0% +0.0% +0.0%
gamteb -0.1% 0.0% -0.0% -0.0% -0.0%
gcd -0.1% 0.0% -0.0% -0.0% -0.0%
gen_regexps -0.1% 0.0% -0.0% -0.0% -0.0%
genfft -0.1% 0.0% -0.0% -0.0% -0.0%
gg -0.1% 0.0% -0.0% -0.0% -0.0%
grep -0.1% 0.0% -0.0% -0.0% -0.0%
hidden -0.1% 0.0% -0.0% -0.0% -0.0%
hpg -0.1% 0.0% -0.0% -0.0% -0.0%
ida -0.1% 0.0% -0.0% -0.0% -0.0%
infer -0.1% 0.0% -0.0% -0.0% -0.0%
integer -0.1% 0.0% -0.0% -0.0% -0.0%
integrate -0.1% 0.0% -0.0% -0.0% -0.0%
k-nucleotide -0.1% 0.0% -0.0% -0.0% -0.0%
kahan -0.1% 0.0% -0.0% -0.0% -0.0%
knights -0.1% 0.0% -0.0% -0.0% -0.0%
lambda -0.1% 0.0% -0.0% -0.0% -0.0%
last-piece -0.1% 0.0% -0.0% -0.0% -0.0%
lcss -0.1% 0.0% -0.0% -0.0% -0.0%
life -0.1% 0.0% -0.0% -0.0% -0.0%
lift -0.1% 0.0% -0.0% -0.0% -0.0%
linear -0.1% 0.0% -0.0% -0.0% -0.0%
listcompr -0.1% 0.0% -0.0% -0.0% -0.0%
listcopy -0.1% 0.0% -0.0% -0.0% -0.0%
maillist -0.1% 0.0% -0.0% -0.0% -0.0%
mandel -0.1% 0.0% -0.0% -0.0% -0.0%
mandel2 -0.1% 0.0% -0.0% -0.0% -0.0%
mate -0.1% 0.0% -0.0% -0.0% -0.0%
minimax -0.1% 0.0% -0.0% -0.0% -0.0%
mkhprog -0.1% 0.0% -0.0% -0.0% -0.0%
multiplier -0.1% 0.0% -0.0% -0.0% -0.0%
n-body -0.1% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.1% 0.0% -0.0% -0.0% -0.0%
para -0.1% 0.0% -0.0% -0.0% -0.0%
paraffins -0.1% 0.0% -0.0% -0.0% -0.0%
parser -0.1% 0.0% -0.0% -0.0% -0.0%
parstof -0.1% 0.0% -0.0% -0.0% -0.0%
pic -0.1% 0.0% -0.0% -0.0% -0.0%
pidigits -0.1% 0.0% -0.0% -0.0% -0.0%
power -0.1% 0.0% -0.0% -0.0% -0.0%
pretty -0.1% 0.0% -0.1% -0.1% -0.1%
primes -0.1% 0.0% -0.0% -0.0% -0.0%
primetest -0.1% 0.0% -0.0% -0.0% -0.0%
prolog -0.1% 0.0% -0.0% -0.0% -0.0%
puzzle -0.1% 0.0% -0.0% -0.0% -0.0%
queens -0.1% 0.0% -0.0% -0.0% -0.0%
reptile -0.1% 0.0% -0.0% -0.0% -0.0%
reverse-complem -0.1% 0.0% -0.0% -0.0% -0.0%
rewrite -0.1% 0.0% -0.0% -0.0% -0.0%
rfib -0.1% 0.0% -0.0% -0.0% -0.0%
rsa -0.1% 0.0% -0.0% -0.0% -0.0%
scc -0.1% 0.0% -0.1% -0.1% -0.1%
sched -0.1% 0.0% -0.0% -0.0% -0.0%
scs -0.1% 0.0% -0.0% -0.0% -0.0%
simple -0.1% 0.0% -0.0% -0.0% -0.0%
solid -0.1% 0.0% -0.0% -0.0% -0.0%
sorting -0.1% 0.0% -0.0% -0.0% -0.0%
spectral-norm -0.1% 0.0% -0.0% -0.0% -0.0%
sphere -0.1% 0.0% -0.0% -0.0% -0.0%
symalg -0.1% 0.0% -0.0% -0.0% -0.0%
tak -0.1% 0.0% -0.0% -0.0% -0.0%
transform -0.1% 0.0% -0.0% -0.0% -0.0%
treejoin -0.1% 0.0% -0.0% -0.0% -0.0%
typecheck -0.1% 0.0% -0.0% -0.0% -0.0%
veritas -0.0% 0.0% -0.0% -0.0% -0.0%
wang -0.1% 0.0% -0.0% -0.0% -0.0%
wave4main -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve1 -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve2 -0.1% 0.0% -0.0% -0.0% -0.0%
x2n1 -0.1% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.5% -0.3% -0.4%
Max -0.0% 0.0% +0.0% +0.0% +0.0%
Geometric Mean -0.1% -0.0% -0.0% -0.0% -0.0%
Test changes
------------
- break006 is marked as broken, see #17833
- The compiler allocates less when building T14683 (an unsafeCoerce#-
heavy happy-generated code) on 64-platforms. Allocates more on 32-bit
platforms.
- Rest of the increases are tiny amounts (still enough to pass the
threshold) in micro-benchmarks. I briefly looked at each one in a
profiling build: most of the increased allocations seem to be because
of random changes in the generated code.
Metric Decrease:
T14683
Metric Increase:
T12150
T12234
T12425
T13035
T14683
T5837
T6048
Co-Authored-By: Richard Eisenberg <rae@cs.brynmawr.edu>
Co-Authored-By: Ömer Sinan Ağacan <omeragacan@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6880d6aa1e6e96579bbff89712efd813489cc828">6880d6aa</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:18:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disentangle DynFlags and SDoc
Remove several uses of `sdocWithDynFlags`. The remaining ones are mostly
CodeGen related (e.g. depend on target platform constants) and will be
fixed separately.
Metric Decrease:
T12425
T9961
WWRec
T1969
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70a901105044c85c756fd93899387f0215f7b1de">70a90110</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-20T21:19:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(List): Add examples to GHC.List
* Add examples
* Cleanup documentation
* Clarify merge process and Marge bot
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8439fc789ff00cfdd453d2425d2146df69e0729">c8439fc7</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-02-20T21:20:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite on powerpc64le
Remove expect broken on recomp tests, #11260 was closed
by !2264 and #11323 most likely by !2264 as well.
GHCi scripts tests work on GHCi but not the external interpreter,
adjust test configuration accordingly. Fixes unexpected passes.
Mark test requiring DWARF expect fail on powerpc64[le] for #11261.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b7256a88ae2bd878da5d026e4183cba6f6eedf">65b7256a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-20T21:20:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use concatMap(M) instead of `concat . map` and the monadic variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b76d4574d703ee66f346775d408220fdddb8155">8b76d457</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-20T21:21:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17832: Weird handling of exports named main in 8.10-rc1
Switching from `lookupGlobalOccRn_maybe` to `lookupInfoOccRn`
to check whether a `main` function is in scope. Unfortunately
`lookupGlobalOccRn_maybe` complains if there are multiple `main`
functions in scope.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/466e1ad5d54cb2e8a3b6f16904b873cad882a736">466e1ad5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-20T21:22:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use TTG for HsSplicedT constructor
The constructor HsSplicedT occurs only in the GhcTc pass.
This enforces this fact statically via TTG.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e622fcabb30ab7f3836bfc5739747b5608bef43">4e622fca</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-20T21:22:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Normalize types when dropping absent arguments from workers
fixes #17852
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a533e54722ec2ec22ef598e07dcfe6c9e84d2602">a533e547</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-20T21:23:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention users guide and release notes in merge request template</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05251b175b3745ed96c9f672115c78c527b63b9e">05251b17</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix typo in BIN_DIST_PREP_TAR_COMP variable name</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44c7e6723498c5dde0cd78e4af26142a14d98f4">f44c7e67</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Avoid duplicating ~/.cabal contents with every build
Previously our attempt to cache the cabal store would
`cp cabal-cache ~/.cabal`. However, if the latter already
existed this meant that we would end up with
~/.cabal/cabal-cache. Not only would this not help caching
but it would exponentially grow the size of ~/.cabal. Not
good!</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5ec996583373025488c090fb2c89f7bda38c1cb">c5ec9965</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Extension: Use Type instead of *
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89cb4cc4cc76f834b0bcc53fb551db706ef143b7">89cb4cc4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Type instead of * in GHC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04eb0d6c4de23a4cfe3953e7496f5bc4b5b1d53c">04eb0d6c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable -Wstar-is-type in -Wall
As noted in [proposal 0143][proposal] this is supposed to happen in
8.12.
Also fix an incorrect claim in the users guide that -Wstar-is-type is
enabled by default.
[proposal]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0143-remove-star-kind.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6de966f1369740d00193e64ec82d11e934256616">6de966f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17724 by having occAnal preserve used bindings.
It sometimes happened that occAnal would remove bindings
as dead code by relying on bindings to be in dependency
order. The fix was contributed by SPJ.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abd7f962a9a9207c07cb864921941750818f61a4">abd7f962</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Mention dependency on `exceptions` in release notes
Fixes #17845.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/581753790da8d094ce05b3fc5f5360f5fbf6a7da">58175379</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: minor GMP refactoring
Somehow I forgot to totally remove `gmpContext` in
d7029cc09edc052c2f97effe33233c53340fcce0. This patch fixes it and adds
some additional comments.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33fa8d9433d82b03f3209698bf27420a32302321">33fa8d94</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-20T21:56:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize liftData to work over any Quote (#17857)
The Overloaded Quotations proposal generalized the type of `lift`
to work over any `Quote`, but not the type of `liftData`, leading
to #17857. Thankfully, generalizing `liftData` is extremely
straightforward.
Fixes #17857.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cea67955a5ae7d3de7aa9dcfdabaf6ee3681ffc">3cea6795</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: fix sdist target (#17848)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2cce997320652031e0c6cc62db5e35deff43a79">e2cce997</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix source-dist target (#17849)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a4c89b208c59ddf79c55ee446fcad5a012bb1bc">0a4c89b2</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:44:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `mkTyConApp liftedTypeKind []`
We really need to make sure that these are shared because otherwise GHC
will allocate thousands of identical `TyConApp` nodes.
See #17292
-------------------------
Metric Decrease:
haddock.Cabal
T14683
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0482f58ab0490b2394ad60946dde3214a0ca1810">0482f58a</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:45:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: wrapGenSyns, don't split the element type too much
The invariant which allowed the pervious method of splitting the type of
the body to find the type of the elements didn't work in the new
overloaded quotation world as the type can be something like
`WriterT () m a` rather than `Q a` like before.
Fixes #17839
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be7068a6130f394dcefbcb5d09c2944deca2270d">be7068a6</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-21T20:45:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser API annotations: RealSrcLoc
During parsing, GHC collects lexical information about AST nodes and
stores it in a map. It is needed to faithfully restore original source
code, e.g. compare these expressions:
a = b
a = b
The position of the equality sign is not recorded in the AST, so it must
be stored elsewhere.
This system is described in Note [Api annotations].
Before this patch, the mapping was represented by:
Map (SrcSpan, AnnKeywordId) SrcSpan
After this patch, the mapping is represented by:
Map (RealSrcSpan, AnnKeywordId) RealSrcSpan
The motivation behind this change is to avoid using the Ord SrcSpan
instance (required by Map here), as it interferes with #17632 (see the
discussion there).
SrcSpan is isomorphic to Either String RealSrcSpan, but we shouldn't
use those strings as Map keys. Those strings are intended as hints to
the user, e.g. "<interactive>" or "<compiler-generated code>", so they
are not a valid way to identify nodes in the source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/240f5bf6f53515535be5bf3ef7632aa69ae21e3e">240f5bf6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:46:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Driver (#13009)
submodule updates: nofib, haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d09411122b9b534b96e988b6d3f6d7eb04b8f66">9d094111</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:47:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: `docs` rule needs `configure` (#17840)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1674353a1ab40fde183f22bef9eb019d8150dc5a">1674353a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-23T17:31:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs: Port fixes from ghc-jailbreak repository
* Override rename, unlink, and remove
* Factor out wchar conversion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/853210f20699b54dee4f85a15b70b3f02a1b68b7">853210f2</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">show gcc linker options in configure summary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2831544aaab15ab17d66e7af42f890d92d47407a">2831544a</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: docs depend on stage1 ghc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d9df9e00b021724d570a12d8c6d7870bdc054ca">1d9df9e0</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:33:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: after 5ce63d52fed the linux bindist for doc-tarball has changed name
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26e8fff33b1b46ba559538b4519730c60c0d45e5">26e8fff3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-24T02:05:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Ord SrcLoc, Ord SrcSpan
Before this patch, GHC relied on Ord SrcSpan to identify source elements, by
using SrcSpan as Map keys:
blackList :: Map SrcSpan () -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map SrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
Firstly, this design is not valid in presence of UnhelpfulSpan, as it
distinguishes between UnhelpfulSpan "X" and UnhelpfulSpan "Y", but those
strings are messages for the user, unfit to serve as identifiers for source
elements.
Secondly, this design made it hard to extend SrcSpan with additional data.
Recall that the definition of SrcSpan is:
data SrcSpan =
RealSrcSpan !RealSrcSpan
| UnhelpfulSpan !FastString
Say we want to extend the RealSrcSpan constructor with additional information:
data SrcSpan =
RealSrcSpan !RealSrcSpan !AdditionalInformation
| UnhelpfulSpan !FastString
getAdditionalInformation :: SrcSpan -> AdditionalInformation
getAdditionalInformation (RealSrcSpan _ a) = a
Now, in order for Map SrcSpan to keep working correctly, we must *ignore* additional
information when comparing SrcSpan values:
instance Ord SrcSpan where
compare (RealSrcSpan r1 _) (RealSrcSpan r2 _) = compare r1 r2
...
However, this would violate an important law:
a == b therefore f a == f b
Ignoring AdditionalInformation in comparisons would mean that with
f=getAdditionalInformation, the law above does not hold.
A more robust design is to avoid Ord SrcSpan altogether, which is what this patch implements.
The mappings are changed to use RealSrcSpan instead:
blackList :: Set RealSrcSpan -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map RealSrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
All SrcSpan comparisons are now done with explicit comparison strategies:
SrcLoc.leftmost_smallest
SrcLoc.leftmost_largest
SrcLoc.rightmost_smallest
These strategies are not subject to the law mentioned above and can easily
discard both the string stored in UnhelpfulSpan and AdditionalInformation.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aa6c18866cf4071246891da3b0f7651b5d28d0f">5aa6c188</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Shuffle text
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3f1741356491332613aacf66c96991682b84603">e3f17413</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Drop old release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84dd96105faff71cb17d1c1d069d724d014847dc">84dd9610</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump directory submodule to 1.3.6.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e295a02440db8b1d96cebad22c5ee48774774681">e295a024</a></strong>
<div>
<span>by Stefan Pavikevik</span>
<i>at 2020-02-24T20:53:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">check for safe arguments, raising error when invalid (fix #17720)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/354e2787be08fb6d973de1a39e58080ff8e107f8">354e2787</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-24T20:54:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments, small refactor
* Remove outdated Note [HsForAllTy tyvar binders] and [Context quantification].
Since the wildcard refactor 1e041b7382, HsForAllTy no longer has an flag
controlling explicity. The field `hsq_implicit` is gone too.
The current situation is covered by Note [HsType binders] which is already
linked from LHsQTyVars.
* Small refactor in CoreLint, extracting common code to a function
* Remove "not so sure about WpFun" in TcEvidence, per Richard's comment
https://gitlab.haskell.org/ghc/ghc/merge_requests/852#note_223226
* Use mkIfThenElse in Foreign/Call, as it does exactly what we need.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b1067d14b656bbbfa7c47f156ec2700c9751549">1b1067d1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-24T20:55:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: CmmToAsm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/621468f680a111c20366a9445a3b225cbc34ffbf">621468f6</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-26T15:08:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Treat coercions as arguments for floating and inlining
This reverts commit 8924224ecfa065ebc67b96a90d01cf9d2edd0e77
and fixes #17787.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/def486c90ef6f37d81d0d9c6df754431ff94c6a4">def486c9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow libnuma library path to be specified
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed03d4e76ead6384e38bb742fee73905d92d1545">ed03d4e7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Refactor gmp arguments
Move the gmp configuration to its own binding.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09b8838422d5dde32af7b09c8adcb4dff4cd00fb">09b88384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Tell Cabal about integer-gmp library location
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/161e08c5d85d7ee7f731db31481cd818480f07a7">161e08c5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-26T15:09:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* FailablePattern can no longer be created since ab51bee40c82
Therefore, Opt_WarnMissingMonadFailInstances has no effect anymore.
* XWrap is no longer used, it was moved to an extension field
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0d09db377bcb3d4caef2abe9db0cac36811d740">e0d09db3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use 8.8.3 to bootstrap on Windows
This should fix #17861.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/972bcf3a1971691ec809452322404ce8f65ad721">972bcf3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix symlink test
Needs to `write` bytes, not str.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/273e60dee183707315415799ae3ed08079ab9ee9">273e60de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add shell subcommand for debugging within CI environment
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43b13ed33f50274383a8dce11cbd7c77b8e851d5">43b13ed3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix colors on Darwin
Darwin sh doesn't support \e.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/217546a798e1eb5a931a677771bbd54bb0e4b5ee">217546a7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Flush stdout buffers in InitEventLogging
Otherwise we are sensitive to libc's buffering strategy.
Similar to the issue fixed in 543dfaab166c81f46ac4af76918ce32190aaab22.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7d4fa55d19f7ac72f3071f9d19e03443c9b538c">c7d4fa55</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add run_hadrian subcommand
I've ruined two trees already by failing to pass --flavour to hadrian.
Let's factor this out so it can be reused during troubleshooting.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7dc54873c0768ad3234c40300ae20e4f1e847bdd">7dc54873</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Allow tests to be marked as broken on the command line
This allows us to work-around distribution-specific breakage easily.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25e2458ee9e8007687c165fe6b27adf91f405ed0">25e2458e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --broken-test flag
This exposes the flag of the same name supported by the testsuite
driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/557699967f9438d3bf2936cbc6edce55b11622e0">55769996</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Mark some tests as broken on Alpine
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ee7f87dbea786259d12fb9177fd2759d4fad3bb">9ee7f87d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Don't use process jobs if they are broken
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfaa39618a25ae642221a478889b9667281b52e8">bfaa3961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
Fixes name of C compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2b49a0aad353201678970c76d8305a5dcb1bfab">b2b49a0a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make hasMetricsFile RHS more descriptive
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/817f93eac4d13f680e8e3e7a25eb403b1864f82e">817f93ea</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-26T15:10:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74311e10bbb6ced9cd3093c8949f2535a715d8f6">74311e10</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-27T16:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Implement Long-distance information with Covered sets
Consider
```hs
data T = A | B | C
f :: T -> Int
f A = 1
f x = case x of
A -> 2
B -> 3
C -> 4
```
Clearly, the RHS returning 2 is redundant. But we don't currently see
that, because our approximation to the covered set of the inner case
expression just picks up the positive information from surrounding
pattern matches. It lacks the context sensivity that `x` can't be `A`
anymore!
Therefore, we adopt the conceptually and practically superior approach
of reusing the covered set of a particular GRHS from an outer pattern
match. In this case, we begin checking the `case` expression with the
covered set of `f`s second clause, which encodes the information that
`x` can't be `A` anymore. After this MR, we will successfully warn about
the RHS returning 2 being redundant.
Perhaps surprisingly, this was a great simplification to the code of
both the coverage checker and the desugarer.
Found a redundant case alternative in `unix` submodule, so we have to
bump it with a fix.
Metric Decrease:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59c023ba5ccb10fff62810591f20608bd73c97af">59c023ba</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-27T16:23:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: correctly generate LIBRARY_template_haskell_VERSION
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9be82389a702c09d03975e7a0c17e5866dc17ffc">9be82389</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-28T02:35:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">boot: Remove remote origin check
Previously, we used relative paths in submodules. When cloning from
GitHub, they had to be manually tweaked.
Since a76b233d we use absolute paths, so this workaround can be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4b6b594fae6b257e997ade3fae67b3378e54a22">f4b6b594</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-28T02:36:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix marking in compact regions
Previously we were tracing the object we were asked to mark, even if it
lives in a compact region. However, there is no need to do this; we need
only to mark the region itself as live.
I have seen a segfault due to this due to the concurrent mark seeing a
an object in the process of being compacted by the mutator.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f97d1fb614ff7638d13eb7c552d2a72fce4c613a">f97d1fb6</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-28T02:36:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: use an explicit import list in System.Environment.ExecutablePath
This was making -Werror builds fail on Windows (at least with Hadrian).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66f5d6d634698ce054a9b9ce0c53ce9682f6f042">66f5d6d6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-28T22:03:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error handling for VTA + deferred type errors
This fixes #17792
See Note [VTA for out-of-scope functions] in TcExpr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37f126033f1e5bf0331143f005ef90ba6e2e02cd">37f12603</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-02-28T22:04:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add arm-unknown-linux-gnueabi
Add arm-unknown-linux-gnueabi, which is used by Debian's ARM EABI port
(armel), as an LLVM target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/327b29e1a05d9f1ea04465c9b23aed92473dd453">327b29e1</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-29T05:06:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Monotonic locations (#17632)
When GHC is parsing a file generated by a tool, e.g. by the C preprocessor, the
tool may insert #line pragmas to adjust the locations reported to the user.
As the result, the locations recorded in RealSrcLoc are not monotonic. Elements
that appear later in the StringBuffer are not guaranteed to have a higher
line/column number.
In fact, there are no guarantees whatsoever, as #line pragmas can arbitrarily
modify locations. This lack of guarantees makes ideas such as #17544
infeasible.
This patch adds an additional bit of information to every SrcLoc:
newtype BufPos = BufPos { bufPos :: Int }
A BufPos represents the location in the StringBuffer, unaffected by any
pragmas.
Updates haddock submodule.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
MultiLayerModules
Naperian
parsing001
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99d2de860ff82e3f626c8b3d47d355ab16d18fd1">99d2de86</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-29T05:07:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">plugins: Ensure that loadInterface plugins can see annotations
loadInterface replaces the `mi_decls`, `mi_insts`, `mi_fam_insts`,
`mi_rules`, `mi_anns` fields of ModIface with `undefined` before
inserting the interface into the EPS. However, we still want to give
loadInterface plugins access to these fields. Consequently, we want to
pass the unmodified `ModIface` the plugin.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a999ee96a22650b59855609f84e2808b4133e9e0">a999ee96</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-02-29T05:07:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghci.sh and build.sh to ghci and build respectively
Convert hadrian buildscripts to unsuffixed, dashed form
final cleanups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5fb58fd1a4a24b9273d9d2de65b6347e1654e98">b5fb58fd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:08:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document and refactor a few things around bitmap scavenging
- Added a few comments in StgPAP
- Added a few comments and assertions in scavenge_small_bitmap and
walk_large_bitmap
- Did tiny refactor in GHC.Data.Bitmap: added some comments, deleted
dead code, used PlatformWordSize type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18757cab04c5c5c48eaceea19469d4811c5d0371">18757cab</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:09:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor runtime interpreter code
In #14335 we want to be able to use both the internal interpreter (for
the plugins) and the external interpreter (for TH and GHCi) at the same
time.
This patch performs some preliminary refactoring: the `hsc_interp` field
of HscEnv replaces `hsc_iserv` and is now used to indicate which
interpreter (internal, external) to use to execute TH and GHCi.
Opt_ExternalInterpreter flag and iserv options in DynFlags are now
queried only when we set the session DynFlags. It should help making GHC
multi-target in the future by selecting an interpreter according to the
selected target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b86a639504e1de79c861a2c11b897089cc63ae5f">b86a6395</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct relative links to haddocks from users guide (fixes #17866)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f55df7f197b7e30d7c6e39d80deb36b7dc86fb5">0f55df7f</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct link to th haddocks from users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/252e51179bd179f52e25dea762ef7b95bc56ce0a">252e5117</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-02-29T05:10:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: enforce POSIX numeric locale for heap profiles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34c7d23074f47c720b5722ca14d78a34213eabb6">34c7d230</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:11:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Hadrian's ``--configure`` (fix #17883)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04d30137771a6cf8a18fda1ced25f78d0b2eb204">04d30137</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:12:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify IfaceIdInfo type
IfaceIdInfo type is confusing: there's practically no difference between
`NoInfo` and `HasInfo []`. The comments say NoInfo is used when
-fomit-interface-pragmas is enabled, but we don't need to distinguish
`NoInfo` from `HasInfo []` in when reading the interface so the
distinction is not important.
This patch simplifies the type by removing NoInfo. When we have no info
we use an empty list.
With this change we no longer read the info list lazily when reading an
IfaceInfoItem, but when reading an IfaceId the ifIdInfo field is
read lazily, so I doubt this is going to be a problem.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3979485bd97771373214c44d14b7830ba447ad23">3979485b</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-29T17:36:59+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Show breakpoint locations of breakpoints which were ignored during :force (#2950)
GHCi is split up into 2 major parts: The user-interface (UI)
and the byte-code interpreter. With `-fexternal-interpreter`
they even run in different processes. Communication between
the UI and the Interpreter (called `iserv`) is done using
messages over a pipe. This is called `Remote GHCI` and
explained in the Note [Remote GHCi] in `compiler/ghci/GHCi.hs`.
To process a `:force` command the UI sends a `Seq` message
to the `iserv` process. Then `iserv` does the effective
evaluation of the value. When during this process a breakpoint
is hit, the `iserv` process has no additional information to
enhance the `Ignoring breakpoint` output with the breakpoint
location.
To be able to print additional breakpoint information,
there are 2 possible implementation choices:
1. Store the needed information in the `iserv` process.
2. Print the `Ignoring breakpoint` from the UI process.
For option 1 we need to store the breakpoint info redundantely
in 2 places and this is bad. Therfore option 2 was implemented
in this MR:
- The user enters a `force` command
- The UI sends a `Seq` message to the `iserv` process.
- If processing of the `Seq` message hits a breakpoint,
the `iserv` process returns control to the UI process.
- The UI looks up the source location of the breakpoint,
and prints the enhanced `Ignoring breakpoint` output.
- The UI sends a `ResumeSeq` message to the `iserv` process,
to continue forcing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cf7303bf39bca734bd87f0f42872f1a4025fa34">3cf7303b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-02T01:18:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* The names in PrelName and THNames are no longer used
since TH merged types and kinds, Typeable is kind-polymorphic,
.net support was removed
* unqualQuasiQuote no longer used since 6f8ff0bbad3b9fa3
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbea7e9d4d4a8812f3dbeed720fb6aa97e16f896">dbea7e9d</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-03-02T01:19:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not define hs_atomic{read,write}64() on non-64bit
Do not define hs_atomicread64() and hs_atomicwrite64() on machines where
WORD_SIZE_IN_BITS is less than 64, just like we do with the rest of the atomic
functions which work on 64-bit values.
Without this, compilation fails on MIPSel and PowerPC with the following error:
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicread64':
atomic.c:(.text.hs_atomicread64+0x8): undefined reference to `__sync_add_and_fetch_8'
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicwrite64':
atomic.c:(.text.hs_atomicwrite64+0x38): undefined reference to `__sync_bool_compare_and_swap_8'
Fixes #17886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c0c76fb1a11532076a0342655a9c889a2a12768">7c0c76fb</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-02T17:13:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set `ImpredicativeTypes` during :print command. (#14828)
If ImpredicativeTypes is not enabled, then `:print <term>` will fail if the
type of <term> has nested `forall`s or `=>`s.
This is because the GHCi debugger's internals will attempt to unify a
metavariable with the type of <term> and then display the result, but if the
type has nested `forall`s or `=>`s, then unification will fail.
As a result, `:print` will bail out and the unhelpful result will be
`<term> = (_t1::t1)` (where `t1` is a metavariable).
Beware: <term> can have nested `forall`s even if its definition doesn't use
RankNTypes! Here is an example from #14828:
class Functor f where
fmap :: (a -> b) -> f a -> f b
Somewhat surprisingly, `:print fmap` considers the type of fmap to have
nested foralls. This is because the GHCi debugger sees the type
`fmap :: forall f. Functor f => forall a b. (a -> b) -> f a -> f b`.
We could envision deeply instantiating this type to get the type
`forall f a b. Functor f => (a -> b) -> f a -> f b`,
but this trick wouldn't work for higher-rank types.
Instead, we adopt a simpler fix: enable `ImpredicativeTypes` when using
`:print` and friends in the GHCi debugger. This is allows metavariables
to unify with types that have nested (or higher-rank) `forall`s/`=>`s,
which makes `:print fmap` display as
`fmap = (_t1::forall a b. Functor f => (a -> b) -> f a -> f b)`, as expected.
Although ImpredicativeTypes is a somewhat unpredictable from a type inference
perspective, there is no danger in using it in the GHCi debugger, since all
of the terms that the GHCi debugger deals with have already been typechecked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a2f51d79f145e015cc089d97cf71c19dd27bee4">2a2f51d7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-02T17:14:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use configure script to detect that we should use in-tree GMP on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c663c2c2ff0d79b2c7cfadb0ce961339f1e7e4c">8c663c2c</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-04T16:12:14+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Be explicit about how stack usage of mvar primops are covered.
This fixes #17893
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cedd6f3041de6abe64dfa3257bec7730a9dced9f">cedd6f30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add getCurrentThreadCPUTime helper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ace618cd2294989e783bd453cee88e0e1c0dad77">ace618cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving-gc: Track time usage of nonmoving marking
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/022b5ad5775ecf6652e663cddb2773d7230385f2">022b5ad5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stats: Add sync pauses to +RTS -S output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/067632342cf2f063b0f23c255740e2717e5e14c7">06763234</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Report nonmoving collector statistics in machine-readable output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70d2b9956d1ecc9d40d1e2d4920983af00ea846d">70d2b995</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:10:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix collection of sparks
Previously sparks living in the non-moving heap would be promptly GC'd
by the minor collector since pruneSparkQueue uses the BF_EVACUATED flag,
which non-moving heap blocks do not have set.
Fix this by implementing proper support in pruneSparkQueue for
determining reachability in the non-moving heap. The story is told in
Note [Spark management in the nonmoving heap].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9668781a36941e7552fcec38f6d4e1d5ec3ef6d1">9668781a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:11:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable Sphinx documentation in Alpine build</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8eb2c2639494bed3326163df52fa13de941cd047">8eb2c263</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Windows breakage by not touching locales on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8dab057f0730a324b7cb7b74a11152f6b96a889">b8dab057</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ensure C numerics in heap profiles using Windows locales if needed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d95260f0b9a91186eb6a99d6235151a22b2c5ae">7d95260f</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: refactor and comment profile locales
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b62781336aff0007aa5fde261c3028a82543a09">5b627813</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-09T16:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use InstanceSigs in GND/DerivingVia-generated code (#17899)
Aside from making the generated code easier to read when
`-ddump-deriv` is enabled, this makes the error message in `T15073`
substantially simpler (see the updated `T15073` expected stderr).
Fixes #17899.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70b5077820a0859d22edd29885b62eef3c363058">70b50778</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Ensure that error parser can handle absolute paths on Windows
This fixes #17786, where the error parser fails to correctly handle the
drive name in absolute Windows paths.
Unfortunately I couldn't find a satisfactory way to test this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85b861d822251486fdf900ee951c275ebd8dfcb3">85b861d8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17786
This isn't pretty but it's perhaps better than nothing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee2c50cbeead0d865a02a963f3f3c72e298398d7">ee2c50cb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-10T02:06:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: track missing configure results
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca8f51d475a69583a228f118e6b9dac98ba483d3">ca8f51d4</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-10T02:07:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for T17904
Closes #17904
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5fa9cb82223de1c1c2684aa6917bf85a2e3c6469">5fa9cb82</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-10T12:29:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">anyRewritableTyVar now looks in RuntimeReps
Previously, anyRewritableTyVar looked only at the arg and res
of `arg -> res`, but their RuntimeReps are also subject to
rewriting. Easy to fix.
Test case: typecheck/should_compile/T17024
Fixes #17024.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ba01d83a2078acce789a9d5f111efa4d4ffc616">5ba01d83</a></strong>
<div>
<span>by Ben Price</span>
<i>at 2020-03-10T12:30:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify a Lint message
When developing a plugin I had a shadowing problem, where I generated
code
app = \f{v r7B} x{v r7B} -> f{v r7B} x{v r7B}
This is obviously wrong, since the occurrence of `f` to the right of the
arrow refers to the `x` binder (they share a Unique). However, it is
rather confusing when Lint reports
Mismatch in type between binder and occurrence
Var: x{v rB7}
since it is printing the binder, rather than the occurrence.
It is rather easy to read this as claiming there is something wrong with
the `x` occurrence!
We change the report to explicitly print both the binder and the
occurrence variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2c827b7b68f0ade7f4ae66e7033fdb84d75a5f">7b2c827b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-10T12:31:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
Clarify code added in #17852 and MR !2724
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3300eeacbbf7a3d1f961f809be5d236c48827b28">3300eeac</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T12:31:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Misc cleanup
- Remove Note [Existentials in shift_con_pat].
The function shift_con_pat has been removed 15 years ago in 23f40f0e9be6d4.
- Remove kcLookupTcTyCon - it's the same as tcLookupTcTyCon
- Remove ASSERT in tyConAppArgN. It's already done by getNth,
and it's the only reason getNth exists.
- Remove unused function nextRole
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abf5736bcad2d740b5854e2e4a9b3547b9b06639">abf5736b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T18:05:01+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typos in comments [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb586f894532baf1bcb822afd0df7f9fea198671">bb586f89</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T00:14:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Prefer darwin-specific getCurrentThreadCPUTime
macOS Catalina now supports a non-POSIX-compliant version of clock_gettime
which cannot use the clock_gettime codepath.
Fixes #17906.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20800b9a9e88a8784a3ee8720544f504aba7b4f7">20800b9a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T08:17:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split GHC.Iface.Utils module
* GHC.Iface.Recomp: recompilation avoidance stuff
* GHC.Iface.Make: mkIface*
Moved `writeIfaceFile` into GHC.Iface.Load alongside `readIface` and
renamed it `writeIface` for consistency.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1daa20298880487b2a351c88f7ade840eb4632c6">1daa2029</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-03-11T08:17:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixed a minor typo in codegen.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bc23338b02ffd624247ace409ab690b2b4a6186">0bc23338</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T08:18:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-quantify when generalising over rewrite rule types
Previously, `tcRules` would check for naughty quantification
candidates (see `Note [Naughty quantification candidates]` in
`TcMType`) when generalising over the type of a rewrite rule. This
caused sensible-looking rewrite rules (like those in #17710) to be
rejected. A more permissing (and easier-to-implement) approach is to
do what is described in `Note [Generalising in tcTyFamInstEqnGuts]`
in `TcTyClsDecls`: just re-quantify all the type variable binders,
regardless of the order in which the user specified them. After all,
the notion of type variable specificity has no real meaning in
rewrite rules, since one cannot "visibly apply" a rewrite rule.
I have written up this wisdom in
`Note [Re-quantify type variables in rules]` in `TcRules`.
As a result of this patch, compiling the `ExplicitForAllRules1` test
case now generates one fewer warning than it used to. As far as I can
tell, this is benign, since the thing that the disappearing warning
talked about was also mentioned in an entirely separate warning.
Fixes #17710.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/336eac7ef049ba9feab5a948120f0f732e26f773">336eac7e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T08:19:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci056 and ghcilink004 as fragile in unreg
As noted in #17018.
Also fix fragile declaration of T13786, which only runs in the normal
way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c61b9b02925acf248cde1ec0f67730c1a6f6c6e5">c61b9b02</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-11T08:19:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deepen call stack for isIn
I see quite a few warnings like:
WARNING: file compiler/utils/Util.hs, line 593
Over-long elem in unionLists
But the call stack is uninformative. Better to add HasDebugCallStack
to isIn. Ditto isn'tIn.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3aa9b35fcc417ab39d8da633482fe64dc9f898b1">3aa9b35f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-11T08:20:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Zero any slop after compaction in compacting GC
In copying GC, with the relevant debug flags enabled, we release the old
blocks after a GC, and the block allocator zeroes the space before
releasing a block. This effectively zeros the old heap.
In compacting GC we reuse the blocks and previously we didn't zero the
unused space in a compacting generation after compaction. With this
patch we zero the slop between the free pointer and the end of the block
when we're done with compaction and when switching to a new block
(because the current block doesn't have enough space for the next object
we're shifting).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e6febcee4b91a88a5027baac4bee5a8847fe79b">8e6febce</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor GHC.Driver.Session (Ways and Flags)
* extract flags and ways into their own modules (with some renaming)
* remove one SOURCE import of GHC.Driver.Session from GHC.Driver.Phases
* when GHC uses dynamic linking (WayDyn), `interpWays` was only
reporting WayDyn even if the host was profiled (WayProf). Now it
returns both as expected (might fix #16803).
* `mkBuildTag :: [Way] -> String` wasn't reporting a canonical tag for
differently ordered lists. Now we sort and nub the list to fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc41e47123b205a45385a3aa69de97ce22686423">bc41e471</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor interpreterDynamic and interpreterProfiled
* `interpreterDynamic` and `interpreterProfiled` now take `Interp`
parameters instead of DynFlags
* slight refactoring of `ExternalInterp` so that we can read the iserv
configuration (which is pure) without reading an MVar.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a6989971379c26d8c288551d536149675e009e34">a6989971</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a Set to represent Ways
Should make `member` queries faster and avoid messing up with missing
`nubSort`.
Metric Increase:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb93a1a4405b448e83cad973f93dab3f7f050736">cb93a1a4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T20:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DeriveFunctor-generated code require fewer beta reductions
Issue #17880 demonstrates that `DeriveFunctor`-generated code is
surprisingly fragile when rank-_n_ types are involved. The culprit is
that `$fmap` (the algorithm used to generate `fmap` implementations)
was too keen on applying arguments with rank-_n_ types to lambdas,
which fail to typecheck more often than not.
In this patch, I change `$fmap` (both the specification and the
implementation) to produce code that avoids creating as many lambdas,
avoiding problems when rank-_n_ field types arise.
See the comments titled "Functor instances" in `TcGenFunctor` for a
more detailed description. Not only does this fix #17880, but it also
ensures that the code that `DeriveFunctor` generates will continue
to work after simplified subsumption is implemented (see #17775).
What is truly amazing is that #17880 is actually a regression
(introduced in GHC 7.6.3) caused by commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e, the fix #7436. Prior to
that commit, the version of `$fmap` that was used was almost
identical to the one used in this patch! Why did that commit change
`$fmap` then? It was to avoid severe performance issues that would
arise for recursive `fmap` implementations, such as in the example
below:
```hs
data List a = Nil | Cons a (List a) deriving Functor
-- ===>
instance Functor List where
fmap f Nil = Nil
fmap f (Cons x xs) = Cons (f x) (fmap (\y -> f y) xs)
```
The fact that `\y -> f y` was eta expanded caused significant
performance overheads. Commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e fixed this performance
issue, but it went too far. As a result, this patch partially
reverts 49ca2a37bef18aa57235ff1dbbf1cc0434979b1e.
To ensure that the performance issues pre-#7436 do not resurface,
I have taken some precautionary measures:
* I have added a special case to `$fmap` for situations where the
last type variable in an application of some type occurs directly.
If this special case fires, we avoid creating a lambda expression.
This ensures that we generate
`fmap f (Cons x xs) = Cons (f x) (fmap f xs)` in the derived
`Functor List` instance above. For more details, see
`Note [Avoid unnecessary eta expansion in derived fmap implementations]`
in `TcGenFunctor`.
* I have added a `T7436b` test case to ensure that the performance
of this derived `Functor List`-style code does not regress.
When implementing this, I discovered that `$replace`, the algorithm
which generates implementations of `(<$)`, has a special case that is
very similar to the `$fmap` special case described above. `$replace`
marked this special case with a custom `Replacer` data type, which
was a bit overkill. In order to use the same machinery for both
`Functor` methods, I ripped out `Replacer` and instead implemented
a simple way to detect the special case. See the updated commentary
in `Note [Deriving <$]` for more details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f9db3e79bd0d70e5a1491174d540717f3bce2bf">1f9db3e7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Properly parenthesise LastStmt
After ApplicatveDo strips the last `return` during renaming, the pretty
printer has to restore it. However, if the return was followed by `$`,
the dollar was stripped too and not restored.
For example, the last stamement in:
```
foo = do
x <- ...
...
return $ f x
```
would be printed as:
```
return f x
```
This commit preserved the dolar, so it becomes:
```
return $ f x
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cb93af73499f9cee4a17427629840feb26171e5">5cb93af7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Do not print ApplicativeDo join
* Do not print `join` in ApplictiveStmt, unless ppr-debug
* Print parens around multiple parallel binds
When ApplicativeDo is enabled, the renamer analyses the statements of a
`do` block and in certain cases marks them as needing to be rewritten
using `join`.
For example, if you have:
```
foo = do
a <- e1
b <- e2
doSomething a b
```
it will be desugared into:
```
foo = join (doSomething <$> e1 <*> e2)
```
After renaming but before desugaring the expression is stored
essentially as:
```
foo = do
[will need join] (a <- e1 | b <- e2)
[no return] doSomething a b
```
Before this change, the pretty printer would print a call to `join`,
even though it is not needed at this stage at all. The expression will be
actually rewritten into one using join only at desugaring, at which
point a literal call to join will be inserted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a259092a02e84d6b45da6b232cfc022898451a0">3a259092</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-12T09:46:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose compulsory unfoldings always
The unsafeCoerce# patch requires that unsafeCoerce# has
a compulsory unfolding that is always available. So we have
to be careful to expose compulsory unfoldings unconditionally
and consistently.
We didn't get this quite right: #17871. This patch fixes
it. No real surprises here.
See Note [Always expose compulsory unfoldings] in GHC.Iface.Tidy
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a65b8c2f5b4bc7abdb0ca3b5876df694acb8194">6a65b8c2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-03-13T02:29:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: improve dependency tracking for the check-* programs
The code in Rules.Register responsible for finding all the build artifacts
that Cabal installs when registering a library (static/shared libs, .hi files,
...) was looking in the wrong place. This patch fixes that logic and makes sure
we gather all those artifacts in a list to declare that the rule for a given
`.conf` file, our proxy for "Hadrian, please install this package in the package
db for this stage", also produces those artifacts under the said package
database.
We also were completely missing some logic to declare that the check-* programs
have dependencies besides their source code, at least when testing an in-tree
compiler.
Finally, this patch also removes redundant packages from 'testsuitePackages',
since they should already be covered by the stage<N>Packages lists from
Settings.Default.
With this patch, after a complete build and freezing stage 1, a change to
`compiler/parser/Parser.y` results in rebuilding the ghc lib, reinstalling it,
and rebuilding the few programs that depend on it, _including_ `check-ppr` and
`check-api-annotations` (therefore fixing #17273).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44fad4a925c06fa2b14611ea08acea9210ee4e00">44fad4a9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-13T02:30:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename isDllName
I wanted to fix the dangling comment in `isDllName` ("This is the cause
of #", #8696 is already mentioned earlier). I took the opportunity to
change the function name to better reflect what it does.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f292db8f10134919c420b71b8a5eccd379212ad">2f292db8</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-13T02:31:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update documentation for closureSize
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f124ff0dfccced755ee97ecac027119269996f8f">f124ff0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T02:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rework triggering of release builds
Use a push option instead of tagging.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f25557a6f240943ebe3eb3b3c7178e76a3e93e1">7f25557a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T10:38:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Distinguish integer-simple test envs
Previously two integer-simple jobs declared the same test environment. One (the nightly job) was built in the perf way, the other in the validate way. Consequently they had appreciably different performance characteristics, causing in the nightly job to spuriously fail with performance changes.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c12a2ec5fe4e7f94d565c0e6398d1d79854db146">c12a2ec5</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:25:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Lint
Ticket #17590 pointed out a bug in the way the linter dealt with
type lets, exposed by the new uniqAway story.
The fix is described in Note [Linting type lets]. I ended up
putting the in-scope Ids in a different env field, le_ids,
rather than (as before) sneaking them into the TCvSubst.
Surprisingly tiresome, but done.
Metric Decrease:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b989845e378081f0932a7fec528e68daeeaa14fb">b989845e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix absolute buildroot support (#17822)
Shake's "**" wildcard doesn't match absolute root. We must use "//" instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f117135673b36816c343bc11efcbb8396160c75">4f117135</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: refactor GMP rules
Document and use simpler rules for the ghc-gmp.h header.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7432b327a3c43c4e2e7c777b41a8e17899b8d0d1">7432b327</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:27:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use correct option name (-opti) (fix #17314)
s/pgmo/opti
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f7dd5710b80906ea7a3e15b7bb56a883a49fed8">8f7dd571</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow overriding LD_STAGE0 and AR_STAGE0 in the configure script.
Previously it was possible to override the stage0 C compiler via `CC_STAGE0`,
but you couldn't override `ld` or `ar` in stage0. This change allows overriding them
by setting `LD_STAGE0` or `AR_STAGE0`, respectively.
Our team uses this feature internally to take more control of our GHC build
and make it run more hermetically.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c3e39a9a7ccb3b6c2953b0397a0d315dc0ec7d5">7c3e39a9</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use AC_ARG_VAR for LD_STAGE0 and AR_STAGE0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20d4d676964382b313b9e44062e45a7c38621999">20d4d676</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:28:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't traverse filled segment list in pause
The non-moving collector would previously walk the entire filled segment
list during the preparatory pause. However, this is far more work than
is strictly necessary. We can rather get away with merely collecting the
allocators' filled segment list heads and process the lists themselves
during the concurrent phase. This can significantly reduce the maximum
gen1 GC pause time in programs with high rates of long-lived allocations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdfa2d0121ca8cc22479dd17a74afa58fc2b39f5">fdfa2d01</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:29:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Remove redundant bitmap clearing
nonmovingSweep already clears the bitmap in the sweep loop. There is no
reason to do so a second time.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f8c77673f1faf0d8fed6df2bdd1ca15d696a010">2f8c7767</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple refactor of cheapEqExpr
No change in functionality. Just seems tidier (and signficantly more
efficient) to deal with ticks directly than to call stripTicksTopE.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f7a76208b0fcf41ca0e16d18a71523f0601ee5">88f7a762</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve CSE.combineAlts
This patch improves the way that CSE combines identical
alternatives. See #17901.
I'm still not happy about the duplication between CSE.combineAlts
and GHC.Core.Utils.combineIdenticalAlts; see the Notes with those
functions. But this patch is a step forward.
Metric Decrease:
T12425
T5642
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b95ddd3f20a67acf5251347d80f9cab191bdfc4">8b95ddd3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:30:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add integer-simple release build for Windows
Closes #16144.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3c374cc5bd7eb49649b9f507f9f7740697e3f70">e3c374cc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wrap an implication around class-sig kind errors
Ticket #17841 showed that we can get a kind error
in a class signature, but lack an enclosing implication
that binds its skolems.
This patch
* Adds the wrapping implication: the new call to
checkTvConstraints in tcClassDecl1
* Simplifies the API to checkTvConstraints, which
was not otherwise called at all.
* Simplifies TcErrors.report_unsolved by *not*
initialising the TidyEnv from the typechecker lexical
envt. It's enough to do so from the free vars of the
unsolved constraints; and we get silly renamings if
we add variables twice: once from the lexical scope
and once from the implication constraint.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73133a3b601b76c46098fb8ad3c76de5fe04c9b2">73133a3b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring in TcSMonad
This patch is just refactoring: no change in
behaviour.
I removed the rather complicated
checkConstraintsTcS
checkTvConstraintsTcS
in favour of simpler functions
emitImplicationTcS
emitTvImplicationTcS
pushLevelNoWorkList
The last of these is a little strange, but overall
it's much better I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93c88c266eacd80a7f2a1754778167390c287b18">93c88c26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:31:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Make `open` calls interruptible
As noted in #17912, `open` system calls were `safe` rather than
`interruptible`. Consequently, the program could not be interrupted with
SIGINT if stuck in a slow open operation. Fix this by marking
`c_safe_open` as interruptible.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bee4cdad4ce68a5bbe6af493d99f0197a34eef5c">bee4cdad</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-03-14T05:32:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove second tcLookupTcTyCon in tcDataDefn
Before this patch, tcDataDefn used to call tcLookupTcTyCon twice in a row:
1. in bindTyClTyVars itself
2. in the continuation passed to it
Now bindTyClTyVars passes the TcTyCon to the continuation, making
the second lookup unnecessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f116d35a5b028ae2bb22da5063900d2f3d0b476">3f116d35</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-03-14T19:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable stage1 build of haddock
The submodule has already been bumped to contain the fix.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49e9d7395a13584f15798bce1601b8d3a6633f11">49e9d739</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-14T19:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix printClosure when printing fwd ptrs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1de3ab4a147eeb0b34b24a3c0e91f174e6e5cb79">1de3ab4a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-14T19:36:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused field var_inline (#17915)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d30aeb4b38381758025bc1002eb2135ad6bc58b8">d30aeb4b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-15T03:57:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document restriction on SCC pragma syntax
Currently, the names of cost centres must be quoted or
be lowercase identifiers.
Fixes #17916.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4774598e6bd060b1b4230b11b734ca40022980d">b4774598</a></strong>
<div>
<span>by Brian Foley</span>
<i>at 2020-03-15T03:58:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove some dead code
>From the notes.ghc.drop list found using weeder in #17713
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd6ffe6be742cf3ec98406704fef53ad86cc1560">dd6ffe6b</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-03-15T03:58:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Note platform-specific Foreign.C.Types in context
Also fix the markup in the general note at the top of the module. Haddock
(usability trade-off), does not support multi-line emphasised text.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e82465fff5851f00449131fdc8bacd3ca95f90f">2e82465f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-15T10:57:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmToAsm (disentangle DynFlags)
This patch disentangles a bit more DynFlags from the native code
generator (CmmToAsm).
In more details:
- add a new NCGConfig datatype in GHC.CmmToAsm.Config which contains the
configuration of a native code generation session
- explicitly pass NCGConfig/Platform arguments when necessary
- as a consequence `sdocWithPlatform` is gone and there are only a few
`sdocWithDynFlags` left
- remove the use of `unsafeGlobalDynFlags` from GHC.CmmToAsm.CFG
- remove `sdocDebugLevel` (now we pass the debug level via NCGConfig)
There are still some places where DynFlags is used, especially because
of pretty-printing (CLabel), because of Cmm helpers (such as
`cmmExprType`) and because of `Outputable` instance for the
instructions. These are left for future refactoring as this patch is
already big.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c35c545d3f32f092c52052349f741739a844ec0f">c35c545d</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-15T10:57:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a -no-haddock flag.
This flag undoes the effect of a previous "-haddock" flag. Having both flags makes it easier
for build systems to enable Haddock parsing in a set of global flags, but then disable it locally for
specific targets (e.g., third-party packages whose comments don't pass the validation in the latest GHC).
I added the flag to expected-undocumented-flags.txt since `-haddock` was alreadyin that list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfcc3c9a1f2e4e33bed4c40767f8e7971e331c15">cfcc3c9a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-15T10:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix global_link of TSOs for threads reachable via dead weaks
Fixes #17785
Here's how the problem occurs:
- In generation 0 we have a TSO that is finished (i.e. it has no more
work to do or it is killed).
- The TSO only becomes reachable after collectDeadWeakPtrs().
- After collectDeadWeakPtrs() we switch to WeakDone phase where we don't
move TSOs to different lists anymore (like the next gen's thread list
or the resurrected_threads list).
- So the TSO will never be moved to a generation's thread list, but it
will be promoted to generation 1.
- Generation 1 collected via mark-compact, and because the TSO is
reachable it is marked, and its `global_link` field, which is bogus at
this point (because the TSO is not in a list), will be threaded.
- Chaos ensues.
In other words, when these conditions hold:
- A TSO is reachable only after collectDeadWeakPtrs()
- It's finished (what_next is ThreadComplete or ThreadKilled)
- It's retained by mark-compact collector (moving collector doesn't
evacuate the global_list field)
We end up doing random mutations on the heap because the TSO's
global_list field is not valid, but it still looks like a heap pointer
so we thread it during compacting GC.
The fix is simple: when we traverse old_threads lists to resurrect
unreachable threads the threads that won't be resurrected currently
stays on the old_threads lists. Those threads will never be visited
again by MarkWeak so we now reset the global_list fields. This way
compacting GC does not thread pointers to nowhere.
Testing
-------
The reproducer in #17785 is quite large and hard to build, because of
the dependencies, so I'm not adding a regression test.
In my testing the reproducer would take a less than 5 seconds to run,
and once in every ~5 runs would fail with a segfault or an assertion
error. In other cases it also fails with a test failure. Because the
tests never fail with the bug fix, assuming the code is correct, this
also means that this bug can sometimes lead to incorrect runtime
results.
After the fix I was able to run the reproducer repeatedly for about an
hour, with no runtime crashes or test failures.
To run the reproducer clone the git repo:
$ git clone https://github.com/osa1/streamly --branch ghc-segfault
Then clone primitive and atomic-primops from their git repos and point
to the clones in cabal.project.local. The project should then be
buildable using GHC HEAD. Run the executable `properties` with `+RTS -c
-DZ`.
In addition to the reproducer above I run the test suite using:
$ make slowtest EXTRA_HC_OPTS="-debug -with-rtsopts=-DS \
-with-rtsopts=-c +RTS -c -RTS" SKIPWAY='nonmoving nonmoving_thr'
This enables compacting GC always in both GHC when building the test
programs and when running the test programs, and also enables sanity
checking when running the test programs. These set of flags are not
compatible for all tests so there are some failures, but I got the same
set of failures with this patch compared to GHC HEAD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/818b3c38e7548f4720815f76969238d82c9650f7">818b3c38</a></strong>
<div>
<span>by Lysxia</span>
<i>at 2020-03-16T23:52:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: add strict IO functions: readFile', getContents', hGetContents'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18a346a4b5a02b8c62e8eedb91b35c2d8e754b96">18a346a4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-16T23:53:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update submodule: haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92327e3afd9d2650c9cc9610297d40c2712da085">92327e3a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-16T23:54:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update sanity checking for TSOs:
- Remove an invalid assumption about GC checking what_next field. The GC
doesn't care about what_next at all, if a TSO is reachable then all
its pointers are followed (other than global_tso, which is only
followed by compacting GC).
- Remove checkSTACK in checkTSO: TSO stacks will be visited in
checkHeapChain, or checkLargeObjects etc.
- Add an assertion in checkTSO to check that the global_link field is
sane.
- Did some refactor to remove forward decls in checkGlobalTSOList and
added braces around single-statement if statements.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1aa40525ddac370766907a49682976e2ea78422">e1aa4052</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-03-17T07:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use non-portable operator "==" in configure.ac
The test operator "==" is a Bash extension and produces a wrong result
if /bin/sh is not Bash.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89f034ddeb4ad7d93c877d5bdbcf2cca7a44f79c">89f034dd</a></strong>
<div>
<span>by Maximilian Tagher</span>
<i>at 2020-03-17T07:36:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the units of -ddump-timings
Right now, in the output of -ddump-timings to a file, you can't tell what the units are:
```
CodeGen [TemplateTestImports]: alloc=22454880 time=14.597
```
I believe bytes/milliseconds are the correct units, but confirmation would be appreciated. I'm basing it off of this snippet from `withTiming'`:
```
when (verbosity dflags >= 2 && prtimings == PrintTimings)
$ liftIO $ logInfo dflags (defaultUserStyle dflags)
(text "!!!" <+> what <> colon <+> text "finished in"
<+> doublePrec 2 time
<+> text "milliseconds"
<> comma
<+> text "allocated"
<+> doublePrec 3 (realToFrac alloc / 1024 / 1024)
<+> text "megabytes")
```
which implies time is in milliseconds, and allocations in bytes (which divided by 1024 would be KB, and again would be MB)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beffa14771ebd6ba24b20337f29045364621c5fa">beffa147</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-17T07:37:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement mapTyCo like foldTyCo
This patch makes mapType use the successful idiom described
in TyCoRep
Note [Specialising foldType]
I have not yet changed any functions to use mapType, though there
may be some suitable candidates.
This patch should be a no-op in terms of functionality but,
because it inlines the mapper itself, I'm hoping that there may
be some modest perf improvements.
Metric Decrease:
T5631
T5642
T3064
T9020
T14683
hie002
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5800ebfeb2fe3e3ed985cdf08a66defea73db71d">5800ebfe</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-17T07:38:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't update ModDetails with CafInfos when opts are disabled
This is consistent with the interface file behavior where we omit
HsNoCafRefs annotations with -fomit-interface-pragmas (implied by -O0).
ModDetails and ModIface are just different representations of the same
thing, so they really need to be in sync. This patch does the right
thing and does not need too much explanation, but here's an example of a
problem not doing this causes in !2842:
-- MyInteger.hs
module MyInteger
( MyInteger (MyInteger)
, ToMyInteger (toMyInteger)
) where
newtype MyInteger = MyInteger Integer
class ToMyInteger a where
toMyInteger :: a -> MyInteger
instance ToMyInteger Integer where
toMyInteger = MyInteger {- . succ -}
-- Main.hs
module Main
( main
) where
import MyInteger (MyInteger (MyInteger), toMyInteger)
main :: IO ()
main = do
let (MyInteger i) = (id . toMyInteger) (41 :: Integer)
print i
If I build this with -O0, without this fix, we generate a ModDetails with
accurate LFInfo for toMyInteger (MyInteger.$fToMyIntegerInteger) which says that
it's a LFReEntrant with arity 1. This means in the use site (Main) we tag the
value:
R3 = MyInteger.$fToMyIntegerInteger_closure + 1;
R2 = GHC.Base.id_closure;
R1 = GHC.Base.._closure;
Sp = Sp - 16;
call stg_ap_ppp_fast(R4, R3, R2, R1) args: 24, res: 0, upd: 24;
Now we change the definition by uncommenting the `succ` part and it becomes a thunk:
MyInteger.$fToMyIntegerInteger [InlPrag=INLINE (sat-args=0)]
:: MyInteger.ToMyInteger GHC.Integer.Type.Integer
[GblId[DFunId(nt)]] =
{} \u [] $ctoMyInteger_rEA;
and its LFInfo is now LFThunk. This change in LFInfo makes a difference in the
use site: we can no longer tag it.
But becuase the interface fingerprint does not change (because ModIface does not
change) we don't rebuild Main and tag the thunk.
(1.2% increase in allocations when building T12545 on armv7 because we
generate more code without CafInfos)
Metric Increase:
T12545
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b632dad2e1d373606fe29f7eee0daf15641560f">5b632dad</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example for Data.Semigroup.diff
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d85d68b004a3d577c0e27d9e6fdddd118e8a9f3">4d85d68b</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75168d07c9c30289709423fc184bbab8dcad0f4e">75168d07</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make example collapsible
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ff2cd0c49735e8f709ac8a5ceab68483eb89df">53ff2cd0</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-17T13:46:57+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17021 by checking more return kinds
All the details are in new Note [Datatype return kinds] in
TcTyClsDecls.
Test case: typecheck/should_fail/T17021{,b}
typecheck/should_compile/T17021a
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/528df8ecb4e2f9c78b1ae4ab7ff8230644e9b643">528df8ec</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-18T10:06:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core operations (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e8a71c1138b587dfbab8a1823b3f7fa6f0166bd">4e8a71c1</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-18T10:07:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release note about fix to #16502.
We thought we needed to update the manual, but the fix for #16502
actually brings the implementation in line with the manual. So we
just alert users of how to update their code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cbf9934c59f7726781cc4cccf4748a5c09c4997">5cbf9934</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-19T00:39:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update "GHC differences to the FFI Chapter" in user guide.
The old entry had a heavy focus on how things had been. Which is
not what I generally look for in a user guide.
I also added a small section on behaviour of nested safe ffi calls.
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b03fd3bcd4ff14aed2942275c3b0db5392dc913c">b03fd3bc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-19T00:40:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Use ConLikeSet to model negative info
In #17911, Simon recognised many warnings stemming from over-long list
unions while coverage checking Cabal's `LicenseId` module.
This patch introduces a new `PmAltConSet` type which uses a `UniqDSet`
instead of an association list for `ConLike`s. For `PmLit`s, it will
still use an assocation list, though, because a similar map data
structure would entail a lot of busy work.
Fixes #17911.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64f207566931469648e791df4f0f0384d45cddd0">64f20756</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-19T12:16:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring: use Platform instead of DynFlags when possible
Metric Decrease:
ManyConstructors
T12707
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb1785d9f839e34a3a4892f354f0c51cc6553c0e">cb1785d9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-19T12:16:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FastString: fix eager reading of string ptr in hashStr
This read causes NULL dereferencing when len is 0.
Fixes #17909
In the reproducer in #17909 this bug is triggered as follows:
- SimplOpt.dealWithStringLiteral is called with a single-char string
("=" in #17909)
- tailFS gets called on the FastString of the single-char string.
- tailFS checks the length of the string, which is 1, and calls
mkFastStringByteString on the tail of the ByteString, which is an
empty ByteString as the original ByteString has only one char.
- ByteString's unsafeUseAsCStringLen returns (NULL, 0) for the empty
ByteString, which is passed to mkFastStringWith.
- mkFastStringWith gets hash of the NULL pointer via hashStr, which
fails on empty strings because of this bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73a7383ebc17f495d7acd04007c8c56b46532cb6">73a7383e</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:42:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify treatment of heterogeneous equality
Previously, if we had a [W] (a :: k1) ~ (rhs :: k2), we would
spit out a [D] k1 ~ k2 and part the W as irreducible, hoping for
a unification. But we needn't do this. Instead, we now spit out
a [W] co :: k2 ~ k1 and then use co to cast the rhs of the original
Wanted. This means that we retain the connection between the
spat-out constraint and the original.
The problem with this new approach is that we cannot use the
casted equality for substitution; it's too like wanteds-rewriting-
wanteds. So, we forbid CTyEqCans that mention coercion holes.
All the details are in Note [Equalities with incompatible kinds]
in TcCanonical.
There are a few knock-on effects, documented where they occur.
While debugging an error in this patch, Simon and I ran into
infelicities in how patterns and matches are printed; we made
small improvements.
This patch includes mitigations for #17828, which causes spurious
pattern-match warnings. When #17828 is fixed, these lines should
be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/faa36e5b3674a7b2cfc6b931eec27b3558fad33b">faa36e5b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-20T20:43:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: ignore in-tree GMP objects with ``--lint``
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a96ff6b1c19c9d0af9c9a39fb2c086f311c7239">9a96ff6b</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update core spec to reflect changes to Core.
Key changes:
* Adds a new rule for forall-coercions over coercion variables, which
was implemented but conspicuously missing from the spec.
* Adds treatment for FunCo.
* Adds treatment for ForAllTy over coercion variables.
* Improves commentary (including restoring a Note lost in
03d4852658e1b7407abb4da84b1b03bfa6f6db3b) in the source.
No changes to running code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e0451c6ce78b08b5f7564aa03a9a86051b35163">7e0451c6</a></strong>
<div>
<span>by Sergej Jaskiewicz</span>
<i>at 2020-03-20T20:44:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix event message in withTiming'
This typo caused generating 'end' events without the corresponding 'begin' events.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1542a626a3649e5fc1becec1eff2715a6108d144">1542a626</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs.h: Add missing declarations on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bcf2ccdd0bdd3cf176943ddb946e4fcef2ac7c1">3bcf2ccd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Avoids redundant case alternative warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b363ef9405c52369b63fc167ded8a533c6a5079">3b363ef9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Normalize slashes in ghc-api annotations output
Enable `normalise_slashes` on `annotations`, `listcomps`, and
`parseTree` to fix Windows failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fc94295c68620c6928751aaadc46b11a185f0c">25fc9429</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f58ec6d94f49cf5713757710c6b80a682ee066b">7f58ec6d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix TOP of T17786
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aadcd909563d5ddf7b2fc469ee3c09c301b1a813">aadcd909</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc1eb10dae03f3fe5f11de845c6772c229684c28">dc1eb10d</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix executable extension passed to testsuite driver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58f62e2caa19e13082807da1d49f94e9cf869322">58f62e2c</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Require that Windows-hadrian job passes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd2415dd2f423688f33a8fb267857e3ff39754d">8dd2415d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Eliminate redundant .exe from GHC path
Previously we were invoking:
bash -c
"c:/GitLabRunner/builds/eEQrxK4p/0/ghc/ghc/toolchain/bin/ghc.exe.exe
testsuite/mk/ghc-config.hs -o _build/test/bin/ghc-config.exe"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/373621f61f812accdeba39c745eb7d015430ff8e">373621f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abc02b4036c2d8efe50b720d8c8103c4f1b8899a">abc02b40</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-03-22T22:38:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Annotate the non-total function in Data.Foldable as such
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19f125578247dfe8036b5793cb3f6b684474f9c7">19f12557</a></strong>
<div>
<span>by Josef Svenningsson</span>
<i>at 2020-03-23T14:05:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ApplicativeDo regression #17835
A previous fix for #15344 made sure that monadic 'fail' is used properly
when translating ApplicativeDo. However, it didn't properly account
for when a 'fail' will be inserted which resulted in some programs
failing with a type error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2643ba465cd2a133b6f495f34fc59cd1a6d23525">2643ba46</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-24T08:31:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example and doc for Arg (Fixes #17153)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/703221f408b023a1b3433938572e7b5c24b4af60">703221f4</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-25T14:45:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use export list of Main module in function TcRnDriver.hs:check_main (Fix #16453)
- Provide the export list of the `Main` module as parameter to the
`compiler/typecheck/TcRnDriver.hs:check_main` function.
- Instead of `lookupOccRn_maybe` call the function `lookupInfoOccRn`.
It returns the list `mains_all` of all the main functions in scope.
- Select from this list `mains_all` all `main` functions that are in
the export list of the `Main` module.
- If this new list contains exactly one single `main` function, then
typechecking continues.
- Otherwise issue an appropriate error message.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e27205a66b06a4501d87eb31e285eadbc693eb7">3e27205a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-25T14:45:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -fkill-absence and -fkill-one-shot flags
They seem to be a benchmarking vestige of the Cardinality paper and
probably shouldn't have been merged to HEAD in the first place.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/262e42aa34c4d5705c8d011907c351497dd4e862">262e42aa</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-03-25T22:41:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not panic on linker errors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0de03cd78729dc58a846c64b645e71057ec5d24e">0de03cd7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-25T22:42:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags refactoring III
Use Platform instead of DynFlags when possible:
* `tARGET_MIN_INT` et al. replaced with `platformMinInt` et al.
* no more DynFlags in PreRules: added a new `RuleOpts` datatype
* don't use `wORD_SIZE` in the compiler
* make `wordAlignment` use `Platform`
* make `dOUBLE_SIZE` a constant
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a04920b23376b2759b5049820400ddd40f7b89e">7a04920b</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: fix a typo in liftA doc
This change removes an extra '|' that should not be rendered in
the liftA documentation.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c5a15f7d257d0a2ded4850e38b6174965a7735b">1c5a15f7</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add Control.Applicative optional example
This change adds an optional example.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d172e63f3dd3590b0a57371efb8f924f1fcdf05">6d172e63</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add markup around Except
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb2162c81964b3a1057c21c73574cc2b542d863a">eb2162c8</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-03-26T12:37:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `ghciTablesNextToCode` from compiler proper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f51efc4bf5f20d1df3d11a2bb4c147f416367ae4">f51efc4b</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Prepare to use run-time tablesNextToCode in compiler exclusively
Factor out CPP as much as possible to prepare for runtime
determinattion.
Progress towards #15548
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c446220250dcada51d4bb33a0cc7d8ce572e8b6">1c446220</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use run-time tablesNextToCode in compiler exclusively (#15548)
Summary:
- There is no more use of the TABLES_NEXT_TO_CODE CPP macro in
`compiler/`. GHCI_TABLES_NEXT_TO_CODE is also removed entirely.
The field within `PlatformMisc` within `DynFlags` is used instead.
- The field is still not exposed as a CLI flag. We might consider some
way to ensure the right RTS / libraries are used before doing that.
Original reviewers:
Original subscribers: TerrorJack, rwbarton, carter
Original Differential Revision: https://phabricator.haskell.org/D5082
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1941ef4f050c0dfcb68229641fcbbde3a10f1072">1941ef4f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Types (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c7c6f1afc8e7f7ba5d256780bc9d5bb5f3e7601">1c7c6f1a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GHC.Types.Unique.Map module
This module isn't used anywhere in GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1a6c73d01912b389e012a0af81a5c2002e82636">f1a6c73d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge GHC.Types.CostCentre.Init into GHC.Driver.CodeOutput
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54250f2d8de910b094070c1b48f086030df634b1">54250f2d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-29T17:29:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand analysis: simplify the demand for a RHS
Ticket #17932 showed that we were using a stupid demand for the RHS
of a let-binding, when the result is a product. This was the result
of a "fix" in 2013, which (happily) turns out to no longer be
necessary.
So I just deleted the code, which simplifies the demand analyser,
and fixes #17932. That in turn uncovered that the anticipation
of worker/wrapper in CPR analysis was inaccurate, hence the logic
that decides whether to unbox an argument in WW was extracted into
a function `wantToUnbox`, now consulted by CPR analysis.
I tried nofib, and got 0.0% perf changes.
All this came up when messing about with !2873 (ticket #17917),
but is idependent of it.
Unfortunately, this patch regresses #4267 and realised that it is now
blocked on #16335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03060b2f963436dd22582f3a1c218b7a74d302ec">03060b2f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786 on Windows
Fixes line ending normalization issue.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f7995baaaf4dcba9b3abaddcd571ac66675ab19">1f7995ba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786
Fix missing quoting and expected exit code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef9c608eba417c59fe45c9edd6a946c59f50b5d2">ef9c608e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T12971 as broken on Windows
Due to #17945.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e54500c12de051cb9695728d27c812e5160593ee">e54500c1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:30:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Store ComponentId details
As far as GHC is concerned, installed package components ("units") are
identified by an opaque ComponentId string provided by Cabal. But we
don't want to display it to users (as it contains a hash) so GHC queries
the database to retrieve some infos about the original source package
(name, version, component name).
This patch caches these infos in the ComponentId itself so that we don't
need to provide DynFlags (which contains installed package informations)
to print a ComponentId.
In the future we want GHC to support several independent package states
(e.g. for plugins and for target code), hence we need to avoid
implicitly querying a single global package state.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e7cb714173652165b8372c3450f4ccd6a377497">7e7cb714</a></strong>
<div>
<span>by Marius Bakke</span>
<i>at 2020-03-29T17:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Remove test that dlopens a PIE object.
glibc 2.30 disallowed dlopening PIE objects, so just remove the test.
Fixes #17952.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c8f80d8876965539571d37d3c7f0fee43c300d2">6c8f80d8</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct haddocks for testBit in Data.Bits
It conflated the nth bit with the bit at offset n.
Now we instead give the definition in terms of `bit and `.&.`
on top of clearer phrasing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c916f190b455d9c43459f81c7ee06d06ab3db957">c916f190</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Bits.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64bf7f51064dad9c63728ac8bccdb9cf00bdb420">64bf7f51</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:32:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add FreeBSD release job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0d8e92e9c9b67426aa139d6bc46363d8940f992">a0d8e92e</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-29T17:33:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Run checkNewDataCon before constraint-solving newtype constructors
Within `checkValidDataCon`, we used to run `checkValidType` on the
argument types of a newtype constructor before running
`checkNewDataCon`, which ensures that the user does not attempt
non-sensical things such as newtypes with multiple arguments or
constraints. This works out in most situations, but this falls over
on a corner case revealed in #17955:
```hs
newtype T = Coercible () T => T ()
```
`checkValidType`, among other things, peforms an ambiguity check on
the context of a data constructor, and that it turn invokes the
constraint solver. It turns out that there is a special case in the
constraint solver for representational equalities (read: `Coercible`
constraints) that causes newtypes to be unwrapped (see
`Note [Unwrap newtypes first]` in `TcCanonical`). This special case
does not know how to cope with an ill formed newtype like `T`, so
it ends up panicking.
The solution is surprisingly simple: just invoke `checkNewDataCon`
before `checkValidType` to ensure that the illicit newtype
constructor context is detected before the constraint solver can
run amok with it.
Fixes #17955.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45eb9d8cad254440eaea25676d6788ca13baa2fb">45eb9d8c</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-29T17:33:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor cleanup
- Simplify mkBuildExpr, the function newTyVars was called
only on a one-element list.
- TTG: use noExtCon in more places. This is more future-proof.
- In zonkExpr, panic instead of printing a warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f024b6e385bd1448968b7bf20de05f655c815bae">f024b6e3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-30T12:48:39+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expect T4267 to pass
Since 54250f2d8de910b094070c1b48f086030df634b1 we expected T4267 to
fail, but it passes on CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57b888c0e90be7189285a6b078c30b26d0923809">57b888c0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require GHC 8.8 as the minimum compiler for bootstrapping
This allows us to remove several bits of CPP that are either always
true or no longer reachable. As an added bonus, we no longer need to
worry about importing `Control.Monad.Fail.fail` qualified to avoid
clashing with `Control.Monad.fail`, since the latter is now the same
as the former.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61">33f09551</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17963
The panic in #17963 happened to be fixed by commit
e3c374cc5bd7eb49649b9f507f9f7740697e3f70. This patch adds a
regression test to ensure that it remains fixed.
Fixes #17963.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09a36e80ecaefcfb60eccda98bd06461d0aeca70">09a36e80</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-31T10:55:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify stderrSupportsAnsiColors
The combinator andM is used only once, and the code is shorter and
simpler if you inline it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95bccdd034ce4dd2d1bc36db9f1ba5e172550249">95bccdd0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:56:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Ensure that encoding global variables aren't inlined
As noted in #17970, these (e.g. `getFileSystemEncoding` and
`setFileSystemEncoding`) previously had unfoldings, which would
break their global-ness.
While not strictly necessary, I also add a NOINLINE on
`initLocaleEncoding` since it is used in `System.IO`, ensuring that we
only system's query the locale encoding once.
Fixes #17970.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/982aaa837aed564ae9b418cda8e97d4facff8fb8">982aaa83</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-31T10:56:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update hadrian index revision.
Required in order to build hadrian using ghc-8.10
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9c586472bf99425f7bbcf346472d7c54f05028">4b9c5864</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:57:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Bump version and add changelog entry
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b39f2e6f63ae50cedd96eaf49146de8ed00fbc8">9b39f2e6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up "Eta reduction for data families" Notes
Before, there were two distinct Notes named
"Eta reduction for data families". This renames one of them to
"Implementing eta reduction for data families" to disambiguate the
two and fixes references in other parts of the codebase to ensure
that they are pointing to the right place.
Fixes #17313.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7627eab5dd882eb6f1567e3ae95c6c770830a5eb">7627eab5</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the changelog/@since information for hGetContents'/getContents'/readFile'
Fixes #17979.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0002db1bf436cbd32f97b659a52b1eee4e8b21db">0002db1b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-01T01:21:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill wORDS_BIGENDIAN and replace it with platformByteOrder (#17957)
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613">7b217179</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-01T15:03:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Adjust recursion depth for inhabitation test
In #17977, we ran into the reduction depth limit of the typechecker.
That was only a symptom of a much broader issue: The recursion depth
of the coverage checker for trying to instantiate strict fields in the
`nonVoid` test was far too high (100, the `defaultMaxTcBound`).
As a result, we were performing quite poorly on `T17977`.
Short of a proper termination analysis to prove emptyness of a type,
we just arbitrarily default to a much lower recursion limit of 3.
Fixes #17977.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c09f636a459f50119bfbb5bf798b9a9e19eb464">3c09f636</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-01T15:03:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make hadrian pass on the no-colour setting to GHC.
Fixes #17983.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b943b25d0786da64031ac63ddf9b4574182057bb">b943b25d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-02T01:45:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-engineer the binder-swap transformation
The binder-swap transformation is implemented by the occurrence
analyser -- see Note [Binder swap] in OccurAnal. However it had
a very nasty corner in it, for the case where the case scrutinee
was a GlobalId. This led to trouble and hacks, and ultimately
to #16296.
This patch re-engineers how the occurrence analyser implements
the binder-swap, by actually carrying out a substitution rather
than by adding a let-binding. It's all described in
Note [The binder-swap substitution].
I did a few other things along the way
* Fix a bug in StgCse, which could allow a loop breaker to be CSE'd
away. See Note [Care with loop breakers] in StgCse. I think it can
only show up if occurrence analyser sets up bad loop breakers, but
still.
* Better commenting in SimplUtils.prepareAlts
* A little refactoring in CoreUnfold; nothing significant
e.g. rename CoreUnfold.mkTopUnfolding to mkFinalUnfolding
* Renamed CoreSyn.isFragileUnfolding to hasCoreUnfolding
* Move mkRuleInfo to CoreFVs
We observed respectively 4.6% and 5.9% allocation decreases for the following
tests:
Metric Decrease:
T9961
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42d68364f66846969edf029f878875c10cdfe0b2">42d68364</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-02T01:46:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve precise exceptions in strictness analysis
Fix #13380 and #17676 by
1. Changing `raiseIO#` to have `topDiv` instead of `botDiv`
2. Give it special treatment in `Simplifier.Util.mkArgInfo`, treating it
as if it still had `botDiv`, to recover dead code elimination.
This is the first commit of the plan outlined in
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/2525#note_260886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a88dd11594b8d8fd20500d026e657a5f99dfdd2">0a88dd11</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:47:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a pointer format string in RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5beac042b995b055a66bc16be536d9e920f6864d">5beac042</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:48:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused closure stg_IND_direct
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f38b03025386f0f1e8f5861eed67d80495168a">88f38b03</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-02T01:48:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Session: Memoize stderrSupportsAnsiColors
Not only is this a reasonable efficiency measure but it avoids making
reentrant calls into ncurses, which is not thread-safe. See #17922.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27740f24cb70fc14b00c1212c06642a144a6117d">27740f24</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:49:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Hadrian build with Cabal-3.2
GHC 8.10 ships with `Cabal-3.2.0.0`, so it would be convenient to
make Hadrian supporting building against 3.2.* instead of having to
rebuild the entirety of `Cabal-3.0.0.0`. There is one API change in
`Cabal-3.2.*` that affects Hadrian: the `synopsis` and `description`
functions now return `ShortText` instead of `String`. Since Hadrian
manipulates these `String`s in various places, I found that the
simplest fix was to use CPP to convert `ShortText` to `String`s
where appropriate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4980200255dabf59ae537f10c55d19ef1a00bbdd">49802002</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-02T01:50:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Stack resolver for hadrian/build-stack
Broken by 57b888c0e90be7189285a6b078c30b26d0923809
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d">30a63e79</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:50:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two ASSERT buglets in reifyDataCon
Two `ASSERT`s in `reifyDataCon` were always using `arg_tys`, but
`arg_tys` is not meaningful for GADT constructors. In fact, it's
worse than non-meaningful, since using `arg_tys` when reifying a
GADT constructor can lead to failed `ASSERT`ions, as #17305
demonstrates.
This patch applies the simplest possible fix to the immediate
problem. The `ASSERT`s now use `r_arg_tys` instead of `arg_tys`, as
the former makes sure to give something meaningful for GADT
constructors. This makes the panic go away at the very least. There
is still an underlying issue with the way the internals of
`reifyDataCon` work, as described in
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227023, but we
leave that as future work, since fixing the underlying issue is
much trickier (see
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227087).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef7576c40f8de391ed8b1c81c38156202e6d17cf">ef7576c4</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-04-03T06:24:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add outputable instances for the types in GHC.Iface.Ext.Types, add -ddump-hie
flag to dump pretty printed contents of the .hie file
Metric Increase:
hie002
Because of the regression on i386:
compile_time/bytes allocated increased from i386-linux-deb9 baseline @ HEAD~10:
Expected hie002 (normal) compile_time/bytes allocated: 583014888.0 +/-10%
Lower bound hie002 (normal) compile_time/bytes allocated: 524713399
Upper bound hie002 (normal) compile_time/bytes allocated: 641316377
Actual hie002 (normal) compile_time/bytes allocated: 877986292
Deviation hie002 (normal) compile_time/bytes allocated: 50.6 %
*** unexpected stat test failure for hie002(normal)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9462452a4843a2c42fe055a0a7e274d5164d1dc0">9462452a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve and refactor StgToCmm codegen for DataCons.
We now differentiate three cases of constructor bindings:
1)Bindings which we can "replace" with a reference to
an existing closure. Reference the replacement closure
when accessing the binding.
2)Bindings which we can "replace" as above. But we still
generate a closure which will be referenced by modules
importing this binding.
3)For any other binding generate a closure. Then reference
it.
Before this patch 1) did only apply to local bindings and we
didn't do 2) at all.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a214d2142c1bafa71fe52cb3823351ff9322d336">a214d214</a></strong>
<div>
<span>by Moritz Bruder</span>
<i>at 2020-04-03T06:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to NonEmpty in libraries/base
This adds a definition to construct a singleton non-empty list
(Data.List.NonEmpty) according to issue #17851.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7597aa0c028ced898ac97e344754dd961b70c57">f7597aa0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: measure compiler stats for T16190
We were mistakenly measuring program stats
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a485c3c4049fff09e989bfd7d2ba47035c92a69b">a485c3c4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move blob handling into StgToCmm
Move handling of big literal strings from CmmToAsm to StgToCmm. It
avoids the use of `sdocWithDynFlags` (cf #10143). We might need to move
this handling even higher in the pipeline in the future (cf #17960):
this patch will make it easier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc2918a0407e1581e824ebd90a1fcbb0637d5744">cc2918a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmStatics
In !2959 we noticed that there was some redundant code (in GHC.Cmm.Utils
and GHC.Cmm.StgToCmm.Utils) used to deal with `CmmStatics` datatype
(before SRT generation) and `RawCmmStatics` datatype (after SRT
generation).
This patch removes this redundant code by using a single GADT for
(Raw)CmmStatics.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e60273db47364fc08aeb5a389caf67559e0d353">9e60273d</a></strong>
<div>
<span>by Maxim Koltsov</span>
<i>at 2020-04-03T06:27:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix haddock formatting in Control.Monad.ST.Lazy.Imp.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b7e8a94cb3334fc0e513dec2db323f32c3a0713">1b7e8a94</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:28:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn newlines into spaces for hadrian/ghci.
The newlines break the command on windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4291bddaea3148908c55f235ee8978e1d9aa6f20">4291bdda</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-03T06:28:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Major improvements to the specialiser
This patch is joint work of Alexis King and Simon PJ. It does some
significant refactoring of the type-class specialiser. Main highlights:
* We can specialise functions with types like
f :: Eq a => a -> Ord b => b => blah
where the classes aren't all at the front (#16473). Here we can
correctly specialise 'f' based on a call like
f @Int @Bool dEqInt x dOrdBool
This change really happened in an earlier patch
commit 2d0cf6252957b8980d89481ecd0b79891da4b14b
Author: Sandy Maguire <sandy@sandymaguire.me>
Date: Thu May 16 12:12:10 2019 -0400
work that this new patch builds directly on that work, and refactors
it a bit.
* We can specialise functions with implicit parameters (#17930)
g :: (?foo :: Bool, Show a) => a -> String
Previously we could not, but now they behave just like a non-class
argument as in 'f' above.
* We can specialise under-saturated calls, where some (but not all of
the dictionary arguments are provided (#17966). For example, we can
specialise the above 'f' based on a call
map (f @Int dEqInt) xs
even though we don't (and can't) give Ord dictionary.
This may sound exotic, but #17966 is a program from the wild, and
showed significant perf loss for functions like f, if you need
saturation of all dictionaries.
* We fix a buglet in which a floated dictionary had a bogus demand
(#17810), by using zapIdDemandInfo in the NonRec case of specBind.
* A tiny side benefit: we can drop dead arguments to specialised
functions; see Note [Drop dead args from specialisations]
* Fixed a bug in deciding what dictionaries are "interesting"; see
Note [Keep the old dictionaries interesting]
This is all achieved by by building on Sandy Macguire's work in
defining SpecArg, which mkCallUDs uses to describe the arguments of
the call. Main changes:
* Main work is in specHeader, which marched down the [InBndr] from the
function definition and the [SpecArg] from the call site, together.
* specCalls no longer has an arity check; the entire mechanism now
handles unders-saturated calls fine.
* mkCallUDs decides on an argument-by-argument basis whether to
specialise a particular dictionary argument; this is new.
See mk_spec_arg in mkCallUDs.
It looks as if there are many more lines of code, but I think that
all the extra lines are comments!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40a85563a46c682eaab5fdf970f7c46afca78cb3">40a85563</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-03T18:26:19+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert accidental change in 9462452
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd75e5da0f1f05f107325733b570bf28b379d2f2">bd75e5da</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-04T07:07:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable ImpredicativeTypes internally when typechecking selector bindings
This is necessary for certain record selectors with higher-rank
types, such as the examples in #18005. See
`Note [Impredicative record selectors]` in `TcTyDecls`.
Fixes #18005.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcfe29c8520244764146c7a5f336be1f9700db6c">dcfe29c8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-06T13:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't override proc CafInfos in ticky builds
Fixes #17947
When we have a ticky label for a proc, IdLabels for the ticky counter
and proc entry share the same Name. This caused overriding proc CafInfos
with the ticky CafInfos (i.e. NoCafRefs) during SRT analysis.
We now ignore the ticky labels when building SRTMaps. This makes sense
because:
- When building the current module they don't need to be in SRTMaps as
they're initialized as non-CAFFY (see mkRednCountsLabel), so they
don't take part in the dependency analysis and they're never added to
SRTs.
(Reminder: a "dependency" in the SRT analysis is a CAFFY dependency,
non-CAFFY uses are not considered as dependencies for the algorithm)
- They don't appear in the interfaces as they're not exported, so it
doesn't matter for cross-module concerns whether they're in the SRTMap
or not.
See also the new Note [Ticky labels in SRT analysis].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cec2c71fe91c88649628c6e83416533b816b86a5">cec2c71f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an tricky specialiser loop
Issue #17151 was a very tricky example of a bug in which the
specialiser accidentally constructs a recurive dictionary,
so that everything turns into bottom.
I have fixed variants of this bug at least twice before:
see Note [Avoiding loops]. It was a bit of a struggle
to isolate the problem, greatly aided by the work that
Alexey Kuleshevich did in distilling a test case.
Once I'd understood the problem, it was not difficult to fix,
though it did lead me a bit of refactoring in specImports.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e850d14ffbeea39ad386b1e888cd97375758d6d6">e850d14f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring only
This refactors DictBinds into a data type rather than a pair.
No change in behaviour, just better code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f38e8d61f066c3064c600c352eebcd87f28d989a">f38e8d61</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-07T02:00:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ProfHeap: Fix memory leak when not compiled with profiling
If we're doing heap profiling on an unprofiled executable we keep
allocating new space in initEra via nextEra on each profiler run but we
don't have a corresponding freeEra call.
We do free the last era in endHeapProfiling but previous eras will have
been overwritten by initEra and will never get free()ed.
Metric Decrease:
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcd668593e1c9e00c5d9c72960b4833dd526cb9a">bcd66859</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-07T02:00:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-export GHC.Magic.noinline from base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d2991f8b4c1b686323b2c9452ce845a60b8d94c">3d2991f8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-07T18:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplifier: Kill off ufKeenessFactor
We used to have another factor, ufKeenessFactor, which would scale the
discounts before they were subtracted from the size. This was justified
with the following comment:
-- We multiple the raw discounts (args_discount and result_discount)
-- ty opt_UnfoldingKeenessFactor because the former have to do with
-- *size* whereas the discounts imply that there's some extra
-- *efficiency* to be gained (e.g. beta reductions, case reductions)
-- by inlining.
However, this is highly suspect since it means that we subtract a
*scaled* size from an absolute size, resulting in crazy (e.g. negative)
scores in some cases (#15304). We consequently killed off
ufKeenessFactor and bumped up the ufUseThreshold to compensate.
Adjustment of unfolding use threshold
=====================================
Since this removes a discount from our inlining heuristic, I revisited our
default choice of -funfolding-use-threshold to minimize the change in
overall inlining behavior. Specifically, I measured runtime allocations
and executable size of nofib and the testsuite performance tests built
using compilers (and core libraries) built with several values of
-funfolding-use-threshold.
This comes as a result of a quantitative comparison of testsuite
performance and code size as a function of ufUseThreshold, comparing
GHC trees using values of 50, 60, 70, 80, 90, and 100. The test set
consisted of nofib and the testsuite performance tests.
A full summary of these measurements are found in the description of
!2608
Comparing executable sizes (relative to the base commit) across all
nofib tests, we see that sizes are similar to the baseline:
gmean min max median
thresh
50 -6.36% -7.04% -4.82% -6.46%
60 -5.04% -5.97% -3.83% -5.11%
70 -2.90% -3.84% -2.31% -2.92%
80 -0.75% -2.16% -0.42% -0.73%
90 +0.24% -0.41% +0.55% +0.26%
100 +1.36% +0.80% +1.64% +1.37%
baseline +0.00% +0.00% +0.00% +0.00%
Likewise, looking at runtime allocations we see that 80 gives slightly
better optimisation than the baseline:
gmean min max median
thresh
50 +0.16% -0.16% +4.43% +0.00%
60 +0.09% -0.00% +3.10% +0.00%
70 +0.04% -0.09% +2.29% +0.00%
80 +0.02% -1.17% +2.29% +0.00%
90 -0.02% -2.59% +1.86% +0.00%
100 +0.00% -2.59% +7.51% -0.00%
baseline +0.00% +0.00% +0.00% +0.00%
Finally, I had to add a NOINLINE in T4306 to ensure that `upd` is
worker-wrappered as the test expects. This makes me wonder whether the
inlining heuristic is now too liberal as `upd` is quite a large
function. The same measure was taken in T12600.
Wall clock time compiling Cabal with -O0
thresh 50 60 70 80 90 100 baseline
build-Cabal 93.88 89.58 92.59 90.09 100.26 94.81 89.13
Also, this change happens to avoid the spurious test output in
`plugin-recomp-change` and `plugin-recomp-change-prof` (see #17308).
Metric Decrease:
hie002
T12234
T13035
T13719
T14683
T4801
T5631
T5642
T9020
T9872d
T9961
Metric Increase:
T12150
T12425
T13701
T14697
T15426
T1969
T3064
T5837
T6048
T9203
T9872a
T9872b
T9872c
T9872d
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/255418da5d264fb2758bc70925adb2094f34adc3">255418da</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-07T18:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: type-checker (#13009)
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50276c01912a28eace285b7dd5f00572674ea9b5">50276c01</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-08T10:44:30+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/CNF: Fix fixup comparison function
Previously we would implicitly convert the difference between two words
to an int, resulting in an integer overflow on 64-bit machines.
Fixes #16992
</pre>
</li>
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