<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
<meta content="text/html; charset=US-ASCII" http-equiv="Content-Type">
<title>
GitLab
</title>
<style>img {
max-width: 100%; height: auto;
}
</style>
</head>
<body>
<div class="content">
<h3>
Ben Gamari pushed to branch wip/T18069
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/5bcf86063c0e5b6ee0d162ea64c88fdaad89e620">5bcf8606</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-17T08:46:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove duplicate Note [When to print foralls] in GHC.Core.TyCo.Ppr
There are two different Notes named `[When to print foralls]`. The
most up-to-date one is in `GHC.Iface.Type`, but there is a second
one in `GHC.Core.TyCo.Ppr`. The latter is less up-to-date, as it was
written before GHC switched over to using ifaces to pretty-print
types. I decided to just remove the latter and replace it with a
reference to the former.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55f0e783d234af103cf4e1d51cd31c99961c5abe">55f0e783</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2020-05-21T12:10:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Add Generic instances to various datatypes under GHC.*
* GHC.Fingerprint.Types: Fingerprint
* GHC.RTS.Flags: GiveGCStats, GCFlags, ConcFlags, DebugFlags, CCFlags, DoHeapProfile, ProfFlags, DoTrace, TraceFlags, TickyFlags, ParFlags and RTSFlags
* GHC.Stats: RTSStats and GCStats
* GHC.ByteOrder: ByteOrder
* GHC.Unicode: GeneralCategory
* GHC.Stack.Types: SrcLoc
Metric Increase:
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9311cd53d33439e8fe79967ba5fb85bcd114fec">a9311cd5</a></strong>
<div>
<span>by Gert-Jan Bottu</span>
<i>at 2020-05-21T12:11:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explicit Specificity
Implementation for Ticket #16393.
Explicit specificity allows users to manually create inferred type variables,
by marking them with braces.
This way, the user determines which variables can be instantiated through
visible type application.
The additional syntax is included in the parser, allowing users to write
braces in type variable binders (type signatures, data constructors etc).
This information is passed along through the renamer and verified in the
type checker.
The AST for type variable binders, data constructors, pattern synonyms,
partial signatures and Template Haskell has been updated to include the
specificity of type variables.
Minor notes:
- Bumps haddock submodule
- Disables pattern match checking in GHC.Iface.Type with GHC 8.8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24e61aad37355fa3a5503b11a60ab7b314a3f405">24e61aad</a></strong>
<div>
<span>by Ben Price</span>
<i>at 2020-05-21T12:12:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint should say when it is checking a rule
It is rather confusing that when lint finds an error in a rule attached
to a binder, it reports the error as in the RHS, not the rule:
...
In the RHS of foo
We add a clarifying line:
...
In the RHS of foo
In a rule attached to foo
The implication that the rule lives inside the RHS is a bit odd, but
this niggle is already present for unfoldings, whose pattern we are
following.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78c6523c5106fc56b653fc14fda5741913da8fdc">78c6523c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-21T12:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Optimise the write barrier
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990">13f6c9d0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:13:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor linear reg alloc to remember past assignments.
When assigning registers we now first try registers we
assigned to in the past, instead of picking the "first"
one.
This is in extremely helpful when dealing with loops for
which variables are dead for part of the loop.
This is important for patterns like this:
foo = arg1
loop:
use(foo)
...
foo = getVal()
goto loop;
There we:
* assign foo to the register of arg1.
* use foo, it's dead after this use as it's overwritten after.
* do other things.
* look for a register to put foo in.
If we pick an arbitrary one it might differ from the register the
start of the loop expect's foo to be in.
To fix this we simply look for past register assignments for
the given variable. If we find one and the register is free we
use that register.
This reduces the need for fixup blocks which match the register
assignment between blocks. In the example above between the end
and the head of the loop.
This patch also moves branch weight estimation ahead of register
allocation and adds a flag to control it (cmm-static-pred).
* It means the linear allocator is more likely to assign the hotter
code paths first.
* If it assign these first we are:
+ Less likely to spill on the hot path.
+ Less likely to introduce fixup blocks on the hot path.
These two measure combined are surprisingly effective. Based on nofib
we get in the mean:
* -0.9% instructions executed
* -0.1% reads/writes
* -0.2% code size.
* -0.1% compiler allocations.
* -0.9% compile time.
* -0.8% runtime.
Most of the benefits are simply a result of removing redundant moves
and spills.
Reduced compiler allocations likely are the result of less code being
generated. (The added lookup is mostly non-allocating).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edc2cc588add3f23b3650f15d3f495943f2c06f9">edc2cc58</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:14:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: Codelayout: Distinguish conditional and other branches.
In #18053 we ended up with a suboptimal code layout because
the code layout algorithm didn't distinguish between conditional
and unconditional control flow.
We can completely eliminate unconditional control flow instructions
by placing blocks next to each other, not so much for conditionals.
In terms of implementation we simply give conditional branches less
weight before computing the layout.
Fixes #18053
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7a6b2f4c690a9711339462114a538a85dcb7d83">b7a6b2f4</a></strong>
<div>
<span>by Gleb Popov</span>
<i>at 2020-05-21T12:15:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Set locale to C.UTF-8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8c27cf6eef51adfa6ac9931d4f620645dc24dd3">a8c27cf6</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow spaces in GHCi :script file names
This patch updates the user interface of GHCi so that file names passed
to the ':script' command may contain spaces escaped with a backslash.
For example:
:script foo\ bar.script
The implementation uses a modified version of 'words' that does not
break on escaped spaces.
Fixes #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82663959d2f1ddbb514a652593bc8064fd69d6aa">82663959</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add extra tests for GHCi :script syntax checks
The syntax for GHCi's ":script" command allows for only a single file
name to be passed as an argument. This patch adds a test for the cases
in which a file name is missing or multiple file names are passed.
Related to #T18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0b79e1b16887371d5cd14d53a607772ca730fb5">a0b79e1b</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow GHCi :script file names in double quotes
This patch updates the user interface of GHCi so that file names passed
to the ':script' command can be wrapped in double quotes.
For example:
:script "foo bar.script"
The implementation uses a modified version of 'words' that treats
character sequences enclosed in double quotes as single words.
Fixes #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf5663300c3d8b8b3c7dc2cd0dce2c923ec68987">cf566330</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update documentation for GHCi :script
This patch adds the fixes that allow for file names containing spaces to
be passed to GHCi's ':script' command to the release notes for 8.12 and
expands the user-guide documentation for ':script' by mentioning how
such file names can be passed.
Related to #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0004ccb885e534c386ceae21580fc59ec7ad0ede">0004ccb8</a></strong>
<div>
<span>by Tuan Le</span>
<i>at 2020-05-21T12:16:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Consider Relocatable read-only data as not constantReferences: #18137
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/964d3ea21e734a4b2ad3ab97955274a003242121">964d3ea2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use `Checker` for `tc_pat`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b797aa420b65c8ee214a4fc94813d0d597352bb4">b797aa42</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use `Checker` for `tc_lpat` and `tc_lpats`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5108e84abb102920ab28e3aeb083ab6e483eb2f6">5108e84a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More judiciously panic in `ts_pat`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/510e04515bb3eaed95d374d685b5322ad7e6389d">510e0451</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put `PatEnv` first in `GHC.Tc.Gen.Pat.Checker`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb4231db322f4a2bb146c456852df6cdf1498dca">cb4231db</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tiny cleaup eta-reduce away a function argument
In GHC, not in the code being compiled!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6890c38d4568ca444cccc47dd1a86c5e020c3521">6890c38d</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use braces with do in `SplicePat` case for consistency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3451584f98d4a6b26dba4079b9a703e70a49a3ab">3451584f</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix spelling mistakes and typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b552e53136abfd6d728563338df99bf899d16139">b552e531</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add INLINABLE pragmas to Enum list producers
The INLINABLE pragmas ensure that we export stable (unoptimised) unfoldings in
the interface file so we can do list fusion at usage sites.
Related tickets: #15185, #8763, #18178.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e748006355d85fcddd17ba206873b0051219abb1">e7480063</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Piggyback on Enum Word methods for Word64
If we are on a 64 bit platform, we can use the efficient Enum Word
methods for the Enum Word64 instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/892b0c41816fca4eeea42ca03a43aac473311837">892b0c41</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document INLINE(ABLE) pragmas that enable fusion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b363ebb988cbf8c92df24eef5366293a80ecb19">2b363ebb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-05-21T12:18:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">MR template should ask for key part</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a95bbd0bdf06d7d61b0bef6de77b59ca31b2c32d">a95bbd0b</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-21T12:19:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `Int`'s `mod` and `rem` strict in their first arguments
They used to be strict until 4d2ac2d (9 years ago).
It's obviously better to be strict for performance reasons.
It also blocks #18067.
NoFib results:
```
--------------------------------------------------------------------------------
Program Allocs Instrs
--------------------------------------------------------------------------------
integer -1.1% +0.4%
wheel-sieve2 +21.2% +20.7%
--------------------------------------------------------------------------------
Min -1.1% -0.0%
Max +21.2% +20.7%
Geometric Mean +0.2% +0.2%
```
The regression in `wheel-sieve2` is due to reboxing that likely will go
away with the resolution of #18067. See !3282 for details.
Fixes #18187.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3d055b8d10a549e42d18ae4859bc902f939f534">d3d055b8</a></strong>
<div>
<span>by Galen Huntington</span>
<i>at 2020-05-21T12:20:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify pitfalls of NegativeLiterals; see #18022.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b508a9e14c7c894ff4f080f099f3947813f41ec">1b508a9e</a></strong>
<div>
<span>by Alexey Kuleshevich</span>
<i>at 2020-05-21T12:21:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix wording in primops documentation to reflect the correct reasoning:
* Besides resizing functions, shrinking ones also mutate the
size of a mutable array and because of those two `sizeofMutabeByteArray`
and `sizeofSmallMutableArray` are now deprecated
* Change reference in documentation to the newer functions `getSizeof*`
instead of `sizeof*` for shrinking functions
* Fix incorrect mention of "byte" instead of "small"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ca0c8a17b9d3a7e8ff8a93cc9e83be5173f8e14">4ca0c8a1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:21:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't variable-length encode magic iface constant.
We changed to use variable length encodings for many types by default,
including Word32. This makes sense for numbers but not when Word32 is
meant to represent four bytes.
I added a FixedLengthEncoding newtype to Binary who's instances
interpret their argument as a collection of bytes instead of a number.
We then use this when writing/reading magic numbers to the iface file.
I also took the libery to remove the dummy iface field.
This fixes #18180.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a127508137ba69d2fe1e563d2bbb9fdd9120ae85">a1275081</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-05-21T12:22:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #11506
The testcase works now.
See explanation in https://gitlab.haskell.org/ghc/ghc/issues/11506#note_273202
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a816e5fbe02c476f51ec92563cad8247ffc90ba">8a816e5f</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-05-21T12:23:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Sort deterministically metric output
Previously, we sorted according to the test name and way,
but the metrics (max_bytes_used/peak_megabytes_allocated etc.)
were appearing in nondeterministic order.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/566cc73f46d67e2b36fda95d0253067bb0ecc12f">566cc73f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-21T12:24:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move isDynLinkName into GHC.Types.Name
It doesn't belong into GHC.Unit.State
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d830bbc9921bcc59164a0a18f0e0874ae4ce226e">d830bbc9</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-05-23T13:36:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fix formatting and add some links
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded">49301ad6</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-05-23T13:37:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cstringLength# and FinalPtr
This function and its accompanying rule resolve issue #5218.
A future PR to the bytestring library will make the internal
Data.ByteString.Internal.unsafePackAddress compute string length
with cstringLength#. This will improve the status quo because it is
eligible for constant folding.
Additionally, introduce a new data constructor to ForeignPtrContents
named FinalPtr. This additional data constructor, when used in the
IsString instance for ByteString, leads to more Core-to-Core
optimization opportunities, fewer runtime allocations, and smaller
binaries.
Also, this commit re-exports all the functions from GHC.CString
(including cstringLength#) in GHC.Exts. It also adds a new test
driver. This test driver is used to perform substring matches on Core
that is dumped after all the simplifier passes. In this commit, it is
used to check that constant folding of cstringLength# works.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcd6bdcce57430d08b335014625722c487ea08e4">dcd6bdcc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:37:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplCore: Ignore ticks in rule templates
This fixes #17619, where a tick snuck in to the template of a rule,
resulting in a panic during rule matching. The tick in question was
introduced via post-inlining, as discussed in `Note [Simplifying
rules]`. The solution we decided upon was to simply ignore ticks in the
rule template, as discussed in `Note [Tick annotations in RULE
matching]`.
Fixes #18162.
Fixes #17619.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80">82cb8913</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-23T13:38:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18145 and also avoid needless work with implicit vars
- `forAllOrNothing` now is monadic, so we can trace whether we bind
an explicit `forall` or not.
- #18145 arose because the free vars calculation was needlessly
complex. It is now greatly simplified.
- Replaced some other implicit var code with `filterFreeVarsToBind`.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a60dc83552c38af9bbc159bd4e092531196db9c0">a60dc835</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Fixes #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/856adf54ab50fc3be66d17a0b94ba3074453b279">856adf54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:40:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify meaning of -haddock flag
Fixes #18206.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ae57afd7abee9dec1050d9feace254ac04800bc">7ae57afd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">git: Add ignored commits file
This can be used to tell git to ignore bulk renaming commits like the
recently-finished module hierarchy refactoring. Configured with,
git config blame.ignoreRevsFile .git-ignore-revs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63d30e60b9ab76ed48fa9539957e7b29a2a8c611">63d30e60</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hie-bios script for windows systems
It is a direct translation of the sh script
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59182b88aaa72d346b480b6aa14a9244915e1189">59182b88</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Honour previous values for CABAL and CABFLAGS
The immediate goal is let the hie-bios.bat script
set CABFLAGS with `-v0` and remove all cabal output
except the compiler arguments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932dc54e13a8e2f60ea90af98682cc1011b9533e">932dc54e</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add specific configuration for windows in hie.yaml
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0eda0707d6cc3d5a85cfb13543df61623e82070">e0eda070</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove not needed hie-bios output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0ea59d641d400543e9e803007500da01eedf48a">a0ea59d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Config module into GHC.Settings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37430251c3f684c46e893552dba78653d80e5243">37430251</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Core.Arity into GHC.Core.Opt.Arity
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a426abb9b41de6097e888b9fdca7b275306b17c9">a426abb9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Hs.Types into GHC.Hs.Type
See discussion in https://gitlab.haskell.org/ghc/ghc/issues/13009#note_268610
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c91a7a095331d8c776f6ecd74803026e0104502">1c91a7a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66bd24d197251b9907cbffba3d5d8a3f5e3c2e80">66bd24d1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-24T01:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add orderingTyCon to wiredInTyCons (#18185)
`Ordering` needs to be wired in for use in the built-in `CmpNat` and
`CmpSymbol` type families, but somehow it was never added to the list
of `wiredInTyCons`, leading to the various oddities observed
in #18185. Easily fixed by moving `orderingTyCon` from
`basicKnownKeyNames` to `wiredInTyCons`.
Fixes #18185.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c43634d443bd3cc0b95b43a7180e12230b845d">01c43634</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-05-24T01:56:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused hs-boot file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a07aa718110071ee30eebadf0b4b372e8e7fc8e">7a07aa71</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix cross-compiler build (#16051)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ccca16e2ecdde0a4e646c6d7515e00a7f364d3">15ccca16</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix distDir per stage
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b420fb2474650e6dfbd66afd199f28492f900f75">b420fb24</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix hp2ps error during cross-compilation
Fixed by @alp (see https://gitlab.haskell.org/ghc/ghc/issues/16051#note_274265)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd339ef0e8ce940902df79ed1d93b3af50ea6f77">cd339ef0</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-24T15:22:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Unicode brackets opening/closing tokens (#18225)
The tokens `[|`, `|]`, `(|`, and `|)` are opening/closing tokens as
described in GHC Proposal #229. This commit makes the unicode
variants (`⟦`, `⟧`, `⦇`, and `⦈`) act the same as their ASCII
counterparts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/013d71204be44d660f01f8eb255db2d48b832421">013d7120</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Specify kind variables for inferred kinds in base."
As noted in !3132, this has rather severe knock-on consequences in
user-code. We'll need to revisit this before merging something along
these lines.
This reverts commit 9749fe1223d182b1f8e7e4f7378df661c509f396.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c4312edd988b8aeeb65e095056743c30678df15">4c4312ed</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Drop redundant ad-hoc boot module check
To determine whether the module is a boot module
Coverage.addTicksToBinds was checking for a `boot` suffix in the module
source filename. This is quite ad-hoc and shouldn't be necessary; the
callsite in `deSugar` already checks that the module isn't a boot
module.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1abf3c844821c98dad7f6f5b23cc3f7889dce64c">1abf3c84</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Make tickBoxCount strict
This could otherwise easily cause a leak of (+) thunks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b28137505a2fc3a15f2c0ba31c39c1869ce65cdc">b2813750</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Make ccIndices strict
This just seems like a good idea.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02e278eb2ace60cf2acadd2f632b51b9017d5b56">02e278eb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Don't produce ModBreaks if not HscInterpreted
emptyModBreaks contains a bottom and consequently it's important that we
don't use it unless necessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8c014ce27c279e0d506d5391a4e9bfa7f1c31f2">b8c014ce</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Factor out addMixEntry
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53814a6424240ab50201fdde81a6e7832c1aad3d">53814a64</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-26T03:03:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add info about typeclass evidence to .hie files
See `testsuite/tests/hiefile/should_run/HieQueries.hs` and
`testsuite/tests/hiefile/should_run/HieQueries.stdout` for an example of this
We add two new fields, `EvidenceVarBind` and `EvidenceVarUse` to the
`ContextInfo` associated with an Identifier. These are associated with the
appropriate identifiers for the evidence variables collected when we come across
`HsWrappers`, `TcEvBinds` and `IPBinds` while traversing the AST.
Instance dictionary and superclass selector dictionaries from `tcg_insts` and
classes defined in `tcg_tcs` are also recorded in the AST as originating from
their definition span
This allows us to save a complete picture of the evidence constructed by the
constraint solver, and will let us report this to the user, enabling features
like going to the instance definition from the invocation of a class method(or
any other method taking a constraint) and finding all usages of a particular
instance.
Additionally,
- Mark NodeInfo with an origin so we can differentiate between bindings
origininating in the source vs those in ghc
- Along with typeclass evidence info, also include information on Implicit
Parameters
- Add a few utility functions to HieUtils in order to query the new info
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6604906c8cfa37f5780a6d5c40506b751b1740db">6604906c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-26T03:04:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make WorkWrap.Lib.isWorkerSmallEnough aware of the old arity
We should allow a wrapper with up to 82 parameters when the original
function had 82 parameters to begin with.
I verified that this made no difference on NoFib, but then again
it doesn't use huge records...
Fixes #18122.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf772f19c06944f0fd03b4bdcd4a49e437084ba5">cf772f19</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-26T03:04:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance Note [About units] for Backpack
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ede241268171e8eee1e750d88ff356ddbfc357f2">ede24126</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-05-27T00:13:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">core-spec: Modify file paths according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* GHC/Core.hs <= coreSyn/CoreSyn.hs
* GHC/Core/Coercion.hs <= types/Coercion.hs
* GHC/Core/Coercion/Axiom.hs <= types/CoAxiom.hs
* GHC/Core/Coercion/Opt.hs <= types/OptCoercion.hs
* GHC/Core/DataCon.hs <= basicTypes/DataCon.hs
* GHC/Core/FamInstEnv.hs <= types/FamInstEnv.hs
* GHC/Core/Lint.hs <= coreSyn/CoreLint.hs
* GHC/Core/Subst.hs <= coreSyn/CoreSubst.hs
* GHC/Core/TyCo/Rep.hs <= types/TyCoRep.hs
* GHC/Core/TyCon.hs <= types/TyCon.hs
* GHC/Core/Type.hs <= types/Type.hs
* GHC/Core/Unify.hs <= types/Unify.hs
* GHC/Types/Literal.hs <= basicTypes/Literal.hs
* GHC/Types/Var.hs <= basicTypes/Var.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04750304deae2128a8350e28224e1f62ae949820">04750304</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T00:14:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Fix racy flushing
Previously no attempt was made to avoid multiple threads writing their
capability-local eventlog buffers to the eventlog writer simultaneously.
This could result in multiple eventlog streams being interleaved. Fix
this by documenting that the EventLogWriter's write() and flush()
functions may be called reentrantly and fix the default writer to
protect its FILE* by a mutex.
Fixes #18210.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6203f24cf421749616a247c047a9b44192f963a">d6203f24</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-27T00:15:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `identifier` parse unparenthesized `->` (#18060)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28deee2872d2501a781ae5b89f1db3dbf796ee74">28deee28</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:23:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unfold: Refactor traceInline
This reduces duplication as well as fixes a bug wherein -dinlining-check
would override -ddump-inlinings. Moreover, the new variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f393e1e0a2998fe67cfd06501e35f495758b98f">1f393e1e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:23:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid unnecessary allocations due to tracing utilities
While ticky-profiling the typechecker I noticed that hundreds of
millions of SDocs are being allocated just in case -ddump-*-trace is
enabled. This is awful.
We avoid this by ensuring that the dump flag check is inlined into the
call site, ensuring that the tracing document needn't be allocated
unless it's actually needed.
See Note [INLINE conditional tracing utilities] for details.
Fixes #18168.
Metric Decrease:
T9961
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f621a78217237a4bdfb299b68827da6cc8f357e">5f621a78</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-05-28T16:23:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Semigroup/Monoid for Q (#18123)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145">dc5f004c</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-05-28T16:24:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18071
Run the core linter on candidate instances to ensure they are
well-kinded.
Better handle quantified constraints by using a CtWanted to avoid
having unsolved constraints thrown away at the end by the solver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10e6982c6117e55b0151dc456e75ebc4798df73f">10e6982c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-28T16:25:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FloatOut: Only eta-expand dead-end RHS if arity will increase (#18231)
Otherwise we risk turning trivial RHS into non-trivial RHS, introducing
unnecessary bindings in the next Simplifier run, resulting in more
churn.
Fixes #18231.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08dab5f74e021ad054112cc5f6bb7e55d8796cd7">08dab5f7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-28T16:25:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Recognise precise exceptions from case alternatives (#18086)
Consider
```hs
m :: IO ()
m = do
putStrLn "foo"
error "bar"
```
`m` (from #18086) always throws a (precise or imprecise) exception or
diverges. Yet demand analysis infers `<L,A>` as demand signature instead
of `<L,A>x` for it.
That's because the demand analyser sees `putStrLn` occuring in a case
scrutinee and decides that it has to `deferAfterPreciseException`,
because `putStrLn` throws a precise exception on some control flow
paths. This will mask the `botDiv` `Divergence`of the single case alt
containing `error` to `topDiv`. Since `putStrLn` has `topDiv` itself,
the final `Divergence` is `topDiv`.
This is easily fixed: `deferAfterPreciseException` works by `lub`ing
with the demand type of a virtual case branch denoting the precise
exceptional control flow. We used `nopDmdType` before, but we can be
more precise and use `exnDmdType`, which is `nopDmdType` with `exnDiv`.
Now the `Divergence` from the case alt will degrade `botDiv` to `exnDiv`
instead of `topDiv`, which combines with the result from the scrutinee
to `exnDiv`, and all is well.
Fixes #18086.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aef95f11f946f7d3f2c4c9b695d632cbfc4a993d">aef95f11</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:25:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ticky-ticky: Record DataCon name in ticker name
This makes it significantly easier to spot the nature of
allocations regressions and comes at a reasonably low cost.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f021b8c474f328441982c90c6a12f716b5607eb">8f021b8c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:26:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't track GHC's verbosity argument
Teach hadrian to ignore GHC's -v argument in its recompilation check,
thus fixing #18131.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13d9380b1fc8b67057a9ad4fffe244040a7f9bc0">13d9380b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:27:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rip out CmmStackInfo(updfr_space)
As noted in #18232, this field is currently completely unused and
moreover doesn't have a clear meaning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f10d11fa49fa9a7a506c4fdbdf86521c2a8d3495">f10d11fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-29T01:38:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix "build/elem" RULE.
An redundant constraint prevented the rule from matching.
Fixing this allows a call to elem on a known list to be translated
into a series of equality checks, and eventually a simple case
expression.
Surprisingly this seems to regress elem for strings. To avoid
this we now also allow foldrCString to inline and add an UTF8
variant. This results in elem being compiled to a tight
non-allocating loop over the primitive string literal which
performs a linear search.
In the process this commit adds UTF8 variants for some of the
functions in GHC.CString. This is required to make this work for
both ASCII and UTF8 strings.
There are also small tweaks to the CString related rules.
We now allow ourselfes the luxury to compare the folding function
via eqExpr, which helps to ensure the rule fires before we inline
foldrCString*. Together with a few changes to allow matching on both
the UTF8 and ASCII variants of the CString functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbeb2389596df61ace5778ec580895ea32cc3c6f">bbeb2389</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreToStg: Add Outputable ArgInfo instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e3361ca414012e3ec40a260c2323986ce770db6">0e3361ca</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Lint check return type of a join point
Consider
join x = rhs in body
It's important that the type of 'rhs' is the same as the type of
'body', but Lint wasn't checking that invariant.
Now it does! This was exposed by investigation into !3113.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c49f7df02ff02c8f09e6a6e00a271b867ca6b092">c49f7df0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not float join points in exprIsConApp_maybe
We hvae been making exprIsConApp_maybe cleverer in recent times:
commit b78cc64e923716ac0512c299f42d4d0012306c05
Date: Thu Nov 15 17:14:31 2018 +0100
Make constructor wrappers inline only during the final phase
commit 7833cf407d1f608bebb1d38bb99d3035d8d735e6
Date: Thu Jan 24 17:58:50 2019 +0100
Look through newtype wrappers (Trac #16254)
commit c25b135ff5b9c69a90df0ccf51b04952c2dc6ee1
Date: Thu Feb 21 12:03:22 2019 +0000
Fix exprIsConApp_maybe
But alas there was still a bug, now immortalised in
Note [Don't float join points]
in SimpleOpt.
It's quite hard to trigger because it requires a dead
join point, but it came up when compiling Cabal
Cabal.Distribution.Fields.Lexer.hs, when working on
!3113.
Happily, the fix is extremly easy. Finding the
bug was not so easy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46720997a0b1fa2971a884adf43de096ce130a7e">46720997</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow simplification through runRW#
Because runRW# inlines so late, we were previously able to do very
little simplification across it. For instance, given even a simple
program like
case runRW# (\s -> let n = I# 42# in n) of
I# n# -> f n#
we previously had no way to avoid the allocation of the I#.
This patch allows the simplifier to push strict contexts into the
continuation of a runRW# application, as explained in
in Note [Simplification of runRW#] in GHC.CoreToStg.Prep.
Fixes #15127.
Metric Increase:
T9961
Metric Decrease:
ManyConstructors
Co-Authored-By: Simon Peyton-Jone <simonpj@microsoft.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/277c2f26e6966e0cfaa1ddcd297af44766f37958">277c2f26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta expand un-saturated primops
Now since we no longer try to predict CAFfyness we have no need for the
solution to #16846. Eta expanding unsaturated primop applications is
conceptually simpler, especially in the presence of levity polymorphism.
This essentially reverts cac8dc9f51e31e4c0a6cd9bc302f7e1bc7c03beb,
as suggested in #18079.
Closes #18079.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44d7ae08442ae6227db37cacc97fe0def8017c5">f44d7ae0</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-05-29T01:40:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Scrap deprecation plan for Data.Monoid.{First,Last}
See the discussion on the libraries mailing list for context:
https://mail.haskell.org/pipermail/libraries/2020-April/030357.html
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b4948951198f93290191d4ee32f92dffed803f4">8b494895</a></strong>
<div>
<span>by Jeremy Schlatter</span>
<i>at 2020-05-29T01:41:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/998450f4c67e8f701455927c9619b8d53f2b733b">998450f4</a></strong>
<div>
<span>by Gleb Popov</span>
<i>at 2020-05-29T01:41:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always define USE_PTHREAD_FOR_ITIMER for FreeBSD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9a513e064bd8a33ad6f8aa5fb8673931507eca1">f9a513e0</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-05-29T01:42:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: introduce 'install' target
Its logic is very simple. It `need`s the `binary-dist-dir` target
and runs suitable `configure` and `make install` commands for the
user. A new `--prefix` command line argument is introduced to
specify where GHC should be installed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67738db10010fd28a8e997b5c8f83ea591b88a0e">67738db1</a></strong>
<div>
<span>by Travis Whitaker</span>
<i>at 2020-05-29T13:34:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Build a threaded stage 1 if the bootstrapping GHC supports it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aac19e6caa0c94e159610f124114186ee20bcdd1">aac19e6c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-05-29T13:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: No per-symbol .section ".toc" directives
All position independent symbols are collected during code generation
and emitted in one go. Prepending each symbol with a .section ".toc"
directive is redundant. This patch drops the per-symbol directives
leading to smaller assembler files.
Fixes #18250
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4413828b7c507872c56719fb8920e1c2322830f8">4413828b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Teach getNumProcessors to return available processors
Previously we would report the number of physical processors, which
can be quite wrong in a containerized setting. Now we rather return how
many processors are in our affinity mask when possible.
I also refactored the code to prefer platform-specific since this will
report logical CPUs instead of physical (using
`machdep.cpu.thread_count` on Darwin and `cpuset_getaffinity` on FreeBSD).
Fixes #14781.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1449435c7bf1075f5cd11098d8c98b99f8fe150a">1449435c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Note change in getNumProcessors in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d96016926cc88506db416f87b6e4b68a3a0d25f">3d960169</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Drop compatibility shims for Windows Vista
We can now assume that the thread and processor group interfaces are
available.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f8f948c024c46282228243391238d09b297cd9d">7f8f948c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-05-30T06:08:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: Fix .size directive on powerpc64 ELF v1
Thanks to Sergei Trofimovich for pointing out the issue.
Fixes #18237
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c555b054bf074a9ab612f9d93e3475bfb8c6594">7c555b05</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-30T06:08:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize GHC.Utils.Monad.
Many functions in this module are recursive and as such are marked
loop breakers. Which means they are unlikely to get an unfolding.
This is *bad*. We always want to specialize them to specific Monads.
Which requires a visible unfolding at the use site.
I rewrote the recursive ones from:
foo f x = ... foo x' ...
to
foo f x = go x
where
go x = ...
As well as giving some pragmas to make all of them available
for specialization.
The end result is a reduction of allocations of about -1.4% for
nofib/spectral/simple/Main.hs when compiled with `-O`.
-------------------------
Metric Decrease:
T12425
T14683
T5631
T9233
T9675
T9961
WWRec
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b1cb5df126b1829fca8e8caf050dff4ca9df3f3">8b1cb5df</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:09:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Windows: Bump Windows toolchain to 0.2
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6947231abd8c33840860ad51699b76efd4725f0e">6947231a</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-30T06:10:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify contexts in GHC.Iface.Ext.Ast
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ee4f36c779674f7237d730460ca83aec9a6808a">2ee4f36c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup OVERWRITING_CLOSURE logic
The code is just more confusing than it needs to be. We don't need to mix
the threaded check with the ldv profiling check since ldv's init already
checks for this. Hence they can be two separate checks. Taking the sanity
checking into account is also cleaner via DebugFlags.sanity. No need for
checking the DEBUG define.
The ZERO_SLOP_FOR_LDV_PROF and ZERO_SLOP_FOR_SANITY_CHECK definitions the
old code had also make things a lot more opaque IMO so I removed those.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6159559b5eb71ed7287998e954f96cdfb2d48f04">6159559b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix OVERWRITING_CLOSURE assuming closures are not inherently used
The new ASSERT in LDV_recordDead() was being tripped up by MVars when
removeFromMVarBlockedQueue() calls OVERWRITING_CLOSURE() via
OVERWRITE_INFO().
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/389920858e0b9efe5234cb7dac55d06e955768f7">38992085</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always zero shrunk mutable array slop when profiling
When shrinking arrays in the profiling way we currently don't always zero
the leftover slop. This means we can't traverse such closures in the heap
profiler. The old Note [zeroing slop] and #8402 have some rationale for why
this is so but I belive the reasoning doesn't apply to mutable
closures. There users already have to ensure multiple threads don't step on
each other's toes so zeroing should be safe.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0c1f2a619855a6fa22021a3118365c49f4cc0c4">b0c1f2a6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18151
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a99a1787da1dda15c6da7509ab678f4131c7d68">9a99a178</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for desugaring of PostfixOperators
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b89ca5b850b4097447cc4908cbb0631011ce979">2b89ca5b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HsToCore: Eta expand left sections
Strangely, the comment next to this code already alluded to the fact
that even simply eta-expanding will sacrifice laziness. It's quite
unclear how we regressed so far.
See #18151.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d412d7a3783b4fc5d3078541a60996e249b4157c">d412d7a3</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-06-01T06:34:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Winferred-safe-imports: Do not exit with error
Currently, when -Winferred-safe-imports is enabled, even when it is not
turned into an error, the compiler will still exit with exit code 1 if
this warning was emitted.
Make sure it is really treated as a warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f945eea569993a4e5ed953f4573e6eab785f309f">f945eea5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:34:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Optimise log2_ceil
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aab606e4f028d3c418aafc9710003f32f8d8fe12">aab606e4</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2020-06-01T06:35:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify description of fromListN</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e5220e25baedfa7ae0ec055c03cb4429dd1af05">7e5220e2</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2020-06-01T06:35:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/GHC/Exts.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3fb1ce9759d1ca57b9ea4acf5518df8d086688e">f3fb1ce9</a></strong>
<div>
<span>by fendor</span>
<i>at 2020-06-01T06:36:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `isInScope` check to `lintCoercion`
Mirrors the behaviour of `lintType`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ac4d94607d4a898f0015114e929ee9a38118985">5ac4d946</a></strong>
<div>
<span>by fendor</span>
<i>at 2020-06-01T06:36:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint rhs of IfaceRule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cef6126a97ea1f406ffe5e780478f6e200c0496">1cef6126</a></strong>
<div>
<span>by Jeremy Schlatter</span>
<i>at 2020-06-01T06:37:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix wording in documentation
The duplicate "orphan instance" phrase here doesn't make sense, and was
probably an accident.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aaf08f25ef0629432c792880dfc6785ff3ec8a3">5aaf08f2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:37:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Modify aclocal.m4 according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* Rename:
* compiler/GHC/Parser.hs <= compiler/parser/Parser.hs
* compiler/GHC/Parser/Lexer.hs <= compiler/Parser/Lexer.hs
* Add:
* compiler/GHC/Cmm/Lexer.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15857ad856b6072d2c6a34b2bf7aa7316d7e2b12">15857ad8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't fail if we can't unlink __symlink_test
Afterall, it's possible we were unable to create it due to lack of
symlink permission.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a7229ef361307e16574b85f71f473f936728890">4a7229ef</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Refactor ghostscript detection
Tamar reported that he saw crashes due to unhandled exceptions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ab37eaf9668b5aacc953c6d01fcab9e4f181bf7">2ab37eaf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/perf_notes: Fix ill-typed assignments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e45d5b667653f4c3ffc89fe7a83eac56d60b9364">e45d5b66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/testutil: Fix bytes/str mismatch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7002d0cbbe1581dd157b530e95c62195f37cfe00">7002d0cb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Work around spurious mypy failure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11390e3ab038a18c2a7bf6b2423657614a439afb">11390e3a</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:39:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up file paths for new module hierarchy
This updates comments only.
This patch replaces file references according to new module hierarchy.
See also:
* https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
* https://gitlab.haskell.org/ghc/ghc/issues/13009
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f2e5732b0eec2d99b821a7f622aee8b2c00739a">8f2e5732</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:39:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modify file paths to module paths for new module hierarchy
This updates comments only.
This patch replaces module references according to new module
hierarchy [1][2].
For files under the `compiler/` directory, I replace them as
module paths instead of file paths. For instance,
`GHC.Unit.State` instead of `compiler/GHC/Unit/State.hs` [3].
For current and future haddock's markup, this patch encloses
the module name with "" [4].
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: https://gitlab.haskell.org/ghc/ghc/issues/13009
[3]: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3375#note_276613
[4]: https://haskell-haddock.readthedocs.io/en/latest/markup.html#linking-to-modules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68b71c4a99ef7c009e0095823950cd12408ad7fe">68b71c4a</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-06-01T06:39:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename the singleton tuple GHC.Tuple.Unit to GHC.Tuple.Solo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95da76c2b9ffe2a4fb4230de0061918de3fc89a9">95da76c2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-01T06:40:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix binary-dist target for cross-compilation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/730fcd54467e82083d56fa87e44bbe346458c531">730fcd54</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for the @-operator
Since GHC diverges from the Haskell Report by allowing the user
to define (@) as an infix operator, we better give a good
error message when the user does so unintentionally.
In general, this is rather hard to do, as some failures will be
discovered only in the renamer or the type checker:
x :: (Integer, Integer)
x @ (a, b) = (1, 2)
This patch does *not* address this general case.
However, it gives much better error messages when the binding
is not syntactically valid:
pairs xs @ (_:xs') = zip xs xs'
Before this patch, the error message was rather puzzling:
<interactive>:1:1: error: Parse error in pattern: pairs
After this patch, the error message includes a hint:
<interactive>:1:1: error:
Parse error in pattern: pairs
In a function binding for the ‘@’ operator.
Perhaps you meant an as-pattern, which must not be surrounded by whitespace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fde53770cacb0d54f0583707ef7ceec78f92c41">0fde5377</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for TypeApplications
With this patch, we always parse f @t as a type application,
thereby producing better error messages.
This steals two syntactic forms:
* Prefix form of the @-operator in expressions. Since the @-operator is
a divergence from the Haskell Report anyway, this is not a major loss.
* Prefix form of @-patterns. Since we are stealing loose infix form
anyway, might as well sacrifice the prefix form for the sake of much
better error messages.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c68e7e1e4c0bddd8b07cd8a2b3651c8cbb4b7851">c68e7e1e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for TemplateHaskellQuotes
While [e| |], [t| |], [d| |], and so on, steal syntax from list
comprehensions, [| |] and [|| ||] do not steal any syntax.
Thus we can improve error messages by always accepting them in the
lexer. Turns out the renamer already performs necessary validation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/120aedbdff7dbb9b394dadabb1f431608b42de67">120aedbd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T16:07:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable use of ld.lld on ARMv7
It turns out that lld non-deterministically fails on ARMv7. I suspect
this may be due to the a kernel regression as this only started
happening when we upgraded to 5.4. Nevertheless, easily avoided by
simply sticking with gold.
Works around #18280.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6279ff0841edee10a665275ed0d2402565fac6d">d6279ff0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-02T13:03:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that workaround for #18280 applies to bindisttest
We need to ensure that the `configure` flags working around #18280 are
propagated to the bindisttest `configure` as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb5c31b51b021ce86890bba73276fe6f7405f5d3">cb5c31b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-03T17:55:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow ARMv7 job to fail
Due to #18298.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32a4ae90b50cc56f2955f489ad0cf8c7ff5e131a">32a4ae90</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-06-04T04:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up boot vs non-boot disambiguating types
We often have (ModuleName, Bool) or (Module, Bool) pairs for "extended"
module names (without or with a unit id) disambiguating boot and normal
modules. We think this is important enough across the compiler that it
deserves a new nominal product type. We do this with synnoyms and a
functor named with a `Gen` prefix, matching other newly created
definitions.
It was also requested that we keep custom `IsBoot` / `NotBoot` sum type.
So we have it too. This means changing many the many bools to use that
instead.
Updates `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05756cdef800f1d8e92114222bcc480bce758b9">c05756cd</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-06-04T04:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: Add more details on InterruptibleFFI.
Details from https://gitlab.haskell.org/ghc/ghc/issues/8684
and https://github.com/takano-akio/filelock/pull/7#discussion_r280332430
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b975aedb1b74b8694d14ba8fdc5955497f8f31c">1b975aed</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-06-04T04:36:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow finalizeForeignPtr to be called on FinalPtr/PlainPtr.
MR 2165 (commit 49301ad6226d9a83d110bee8c419615dd94f5ded) regressed
finalizeForeignPtr by throwing exceptions when PlainPtr was encounterd.
This regression did not make it into a release of GHC. Here, the
original behavior is restored, and FinalPtr is given the same treatment
as PlainPtr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bd3929ad1b06b01c1d22d513902507eefadc131">2bd3929a</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2020-06-04T04:36:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation on type families not being extracted
It looks like the location of the Names used for CoAxioms on type
families are now located at their type constructors. Previously, Docs.hs
thought the Names were located in the RHS, so the RealSrcSpan in the
instanceMap and getInstLoc didn't match up. Fixes #18241
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6735b9d94605b4c7f75e70339bfaa4207f23e52b">6735b9d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:37:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Instances: Compile with -O0
This module contains exclusively Data instances, which are going to be
slow no matter what we do. Furthermore, they are incredibly slow to
compile with optimisation (see #9557). Consequently we compile this with
-O0. See #18254.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c330331adc0a686f24b94844d0eb3a0711b928d7">c330331a</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-06-04T04:37:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17669
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cab684f0857c71c40996201d6fb3ba93eb38a701">cab684f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add Windows-specific implementation of rtsSleep
Previously we would use the POSIX path, which uses `nanosleep`. However,
it turns out that `nanosleep` is provided by `libpthread` on Windows. In
general we don't want to incur such a dependency. Avoid this by simply
using `Sleep` on Windows.
Fixes #18272.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad44b50484f27beceab8213a061aa60c7a03f7ca">ad44b504</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Disable use of process jobs with process < 1.6.9
Due to #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a4098a4bb89b3d30cca26d82b82724913062536">6a4098a4</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-04T04:55:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker] Adds void printLoadedObjects(void);
This allows us to dump in-memory object code locations for debugging.
Fixup printLoadedObjects prototype
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5e3a885ddd09dd5f550552c535af3661ff3dbf">af5e3a88</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-05T03:18:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: fix sign confusion in log1mexp implementation (fix #17125)
author: claude (https://gitlab.haskell.org/trac-claude)
The correct threshold for log1mexp is -(log 2) with the current specification
of log1mexp. This change improves accuracy for large negative inputs.
To avoid code duplication, a small helper function is added;
it isn't the default implementation in Floating because it needs Ord.
This patch does nothing to address that the Haskell specification is
different from that in common use in other languages.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b792facab46f7cdd09d12e79499f4e0dcd4293f">2b792fac</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-05T09:27:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple subsumption
This patch simplifies GHC to use simple subsumption.
Ticket #17775
Implements GHC proposal #287
https://github.com/ghc-proposals/ghc-proposals/blob/master/
proposals/0287-simplify-subsumption.rst
All the motivation is described there; I will not repeat it here.
The implementation payload:
* tcSubType and friends become noticably simpler, because it no
longer uses eta-expansion when checking subsumption.
* No deeplyInstantiate or deeplySkolemise
That in turn means that some tests fail, by design; they can all
be fixed by eta expansion. There is a list of such changes below.
Implementing the patch led me into a variety of sticky corners, so
the patch includes several othe changes, some quite significant:
* I made String wired-in, so that
"foo" :: String rather than
"foo" :: [Char]
This improves error messages, and fixes #15679
* The pattern match checker relies on knowing about in-scope equality
constraints, andd adds them to the desugarer's environment using
addTyCsDs. But the co_fn in a FunBind was missed, and for some reason
simple-subsumption ends up with dictionaries there. So I added a
call to addTyCsDs. This is really part of #18049.
* I moved the ic_telescope field out of Implication and into
ForAllSkol instead. This is a nice win; just expresses the code
much better.
* There was a bug in GHC.Tc.TyCl.Instance.tcDataFamInstHeader.
We called checkDataKindSig inside tc_kind_sig, /before/
solveEqualities and zonking. Obviously wrong, easily fixed.
* solveLocalEqualitiesX: there was a whole mess in here, around
failing fast enough. I discovered a bad latent bug where we
could successfully kind-check a type signature, and use it,
but have unsolved constraints that could fill in coercion
holes in that signature -- aargh.
It's all explained in Note [Failure in local type signatures]
in GHC.Tc.Solver. Much better now.
* I fixed a serious bug in anonymous type holes. IN
f :: Int -> (forall a. a -> _) -> Int
that "_" should be a unification variable at the /outer/
level; it cannot be instantiated to 'a'. This was plain
wrong. New fields mode_lvl and mode_holes in TcTyMode,
and auxiliary data type GHC.Tc.Gen.HsType.HoleMode.
This fixes #16292, but makes no progress towards the more
ambitious #16082
* I got sucked into an enormous refactoring of the reporting of
equality errors in GHC.Tc.Errors, especially in
mkEqErr1
mkTyVarEqErr
misMatchMsg
misMatchMsgOrCND
In particular, the very tricky mkExpectedActualMsg function
is gone.
It took me a full day. But the result is far easier to understand.
(Still not easy!) This led to various minor improvements in error
output, and an enormous number of test-case error wibbles.
One particular point: for occurs-check errors I now just say
Can't match 'a' against '[a]'
rather than using the intimidating language of "occurs check".
* Pretty-printing AbsBinds
Tests review
* Eta expansions
T11305: one eta expansion
T12082: one eta expansion (undefined)
T13585a: one eta expansion
T3102: one eta expansion
T3692: two eta expansions (tricky)
T2239: two eta expansions
T16473: one eta
determ004: two eta expansions (undefined)
annfail06: two eta (undefined)
T17923: four eta expansions (a strange program indeed!)
tcrun035: one eta expansion
* Ambiguity check at higher rank. Now that we have simple
subsumption, a type like
f :: (forall a. Eq a => Int) -> Int
is no longer ambiguous, because we could write
g :: (forall a. Eq a => Int) -> Int
g = f
and it'd typecheck just fine. But f's type is a bit
suspicious, and we might want to consider making the
ambiguity check do a check on each sub-term. Meanwhile,
these tests are accepted, whereas they were previously
rejected as ambiguous:
T7220a
T15438
T10503
T9222
* Some more interesting error message wibbles
T13381: Fine: one error (Int ~ Exp Int)
rather than two (Int ~ Exp Int, Exp Int ~ Int)
T9834: Small change in error (improvement)
T10619: Improved
T2414: Small change, due to order of unification, fine
T2534: A very simple case in which a change of unification order
means we get tow unsolved constraints instead of one
tc211: bizarre impredicative tests; just accept this for now
Updates Cabal and haddock submodules.
Metric Increase:
T12150
T12234
T5837
haddock.base
Metric Decrease:
haddock.compiler
haddock.Cabal
haddock.base
Merge note: This appears to break the
`UnliftedNewtypesDifficultUnification` test. It has been marked as
broken in the interest of merging.
(cherry picked from commit 66b7b195cb3dce93ed5078b80bf568efae904cc5)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2dff814158e08aed53036bf6ebd7c3c8394af438">2dff8141</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-05T14:21:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify bindLHsTyVarBndrs and bindHsQTyVars
Both `bindLHsTyVarBndrs` and `bindHsQTyVars` take two separate
`Maybe` arguments, which I find terribly confusing. Thankfully, it's
possible to remove one `Maybe` argument from each of these functions,
which this patch accomplishes:
* `bindHsQTyVars` takes a `Maybe SDoc` argument, which is `Just` if
GHC should warn about any of the quantified type variables going
unused. However, every call site uses `Nothing` in practice. This
makes sense, since it doesn't really make sense to warn about
unused type variables bound by an `LHsQTyVars`. For instance, you
wouldn't warn about the `a` in `data Proxy a = Proxy` going unused.
As a result, I simply remove this `Maybe SDoc` argument altogether.
* `bindLHsTyVarBndrs` also takes a `Maybe SDoc` argument for the same
reasons that `bindHsQTyVars` took one. To make things more
confusing, however, `bindLHsTyVarBndrs` also takes a separate
`HsDocContext` argument, which is pretty-printed (to an `SDoc`) in
warnings and error messages.
In practice, the `Maybe SDoc` and the `HsDocContext` often contain
the same text. See the call sites for `bindLHsTyVarBndrs` in
`rnFamInstEqn` and `rnConDecl`, for instance. There are only a
handful of call sites where the text differs between the
`Maybe SDoc` and `HsDocContext` arguments:
* In `rnHsRuleDecl`, where the `Maybe SDoc` says "`In the rule`"
and the `HsDocContext` says "`In the transformation rule`".
* In `rnHsTyKi`/`rn_ty`, where the `Maybe SDoc` says
"`In the type`" but the `HsDocContext` is inhereted from the
surrounding context (e.g., if `rnHsTyKi` were called on a
top-level type signature, the `HsDocContext` would be
"`In the type signature`" instead)
In both cases, warnings/error messages arguably _improve_ by
unifying making the `Maybe SDoc`'s text match that of the
`HsDocContext`. As a result, I decided to remove the `Maybe SDoc`
argument to `bindLHsTyVarBndrs` entirely and simply reuse the text
from the `HsDocContext`. (I decided to change the phrase
"transformation rule" to "rewrite rule" while I was in the area.)
The `Maybe SDoc` argument has one other purpose: signaling when to
emit "`Unused quantified type variable`" warnings. To recover this
functionality, I replaced the `Maybe SDoc` argument with a
boolean-like `WarnUnusedForalls` argument. The only
`bindLHsTyVarBndrs` call site that chooses _not_ to emit these
warnings in `bindHsQTyVars`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e372331b3212e5d8eddfa6f8d2c3840b7e95c2b3">e372331b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T08:46:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add missing deriveConstants dependency on ghcplatform.h
deriveConstants wants to compile C sources which #include PosixSource.h,
which itself #includes ghcplatform.h. Make sure that Hadrian knows
about this dependency.
Fixes #18290.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b022051a50d30e39d86ee21e565e899e7e98255f">b022051a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim needs to depend on libc and libm
libm is just an empty shell on musl, and all the math functions are contained in
libc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6dae65484f9552239652f743e2303fa17aae953b">6dae6548</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable DLL loading if without system linker
Some platforms (musl, aarch64) do not have a working dynamic linker
implemented in the libc, even though we might see dlopen. It will
ultimately just return that this is not supported. Hence we'll add
a flag to the compiler to flat our disable loading dlls. This is
needed as we will otherwise try to load the shared library even
if this will subsequently fail. At that point we have given up
looking for static options though.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a158ffc4e0ac250897aefaf6caf03eb5f688182">4a158ffc</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Range is actually +/-2^32, not +/-2^31
See also: https://static.docs.arm.com/ihi0056/g/aaelf64.pdf
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1bfb806683b3092fc5ead84e7ecff928c55fbc4">f1bfb806</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T10:49:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">OccurAnal: Avoid exponential behavior due to where clauses
Previously the `Var` case of `occAnalApp` could in some cases (namely
in the case of `runRW#` applications) call `occAnalRhs` two. In the case
of nested `runRW#`s this results in exponential complexity. In some
cases the compilation time that resulted would be very long indeed
(see #18296).
Fixes #18296.
Metric Decrease:
T9961
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b607671b9158c60470b2bd57804a7684d3ea33f">9b607671</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-09T08:05:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add link to GHC's wiki in the GHC API header
This adds a URL to point to GHC's wiki in the GHC API header.
Newcomers could easily find more information from the GHC API's
web like [1].
[1]: Current version, https://ghc.gitlab.haskell.org/ghc/doc/libraries/ghc-8.11.0.20200604/index.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72c7fe9a1e147dfeaf043f6d591d724a126cce45">72c7fe9a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-09T08:06:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make GADT constructors adhere to the forall-or-nothing rule properly
Issue #18191 revealed that the types of GADT constructors don't quite
adhere to the `forall`-or-nothing rule. This patch serves to clean up
this sad state of affairs somewhat. The main change is not in the
code itself, but in the documentation, as this patch introduces two
sections to the GHC User's Guide:
* A "Formal syntax for GADTs" section that presents a BNF-style
grammar for what is and isn't allowed in GADT constructor types.
This mostly exists to codify GHC's existing behavior, but it also
imposes a new restriction that addresses #18191: the outermost
`forall` and/or context in a GADT constructor is not allowed to be
surrounded by parentheses. Doing so would make these
`forall`s/contexts nested, and GADTs do not support nested
`forall`s/contexts at present.
* A "`forall`-or-nothing rule" section that describes exactly what
the `forall`-or-nothing rule is all about. Surprisingly, there was
no mention of this anywhere in the User's Guide up until now!
To adhere the new specification in the "Formal syntax for GADTs"
section of the User's Guide, the following code changes were made:
* A new function, `GHC.Hs.Type.splitLHsGADTPrefixTy`, was introduced.
This is very much like `splitLHsSigmaTy`, except that it avoids
splitting apart any parentheses, which can be syntactically
significant for GADT types. See
`Note [No nested foralls or contexts in GADT constructors]` in
`GHC.Hs.Type`.
* `ConDeclGADTPrefixPs`, an extension constructor for `XConDecl`, was
introduced so that `GHC.Parser.PostProcess.mkGadtDecl` can return
it when given a prefix GADT constructor. Unlike `ConDeclGADT`,
`ConDeclGADTPrefixPs` does not split the GADT type into its argument
and result types, as this cannot be done until after the type is
renamed (see `Note [GADT abstract syntax]` in `GHC.Hs.Decls` for why
this is the case).
* `GHC.Renamer.Module.rnConDecl` now has an additional case for
`ConDeclGADTPrefixPs` that (1) splits apart the full `LHsType` into
its `forall`s, context, argument types, and result type, and
(2) checks for nested `forall`s/contexts. Step (2) used to be
performed the typechecker (in `GHC.Tc.TyCl.badDataConTyCon`) rather
than the renamer, but now the relevant code from the typechecker
can simply be deleted.
One nice side effect of this change is that we are able to give a
more accurate error message for GADT constructors that use visible
dependent quantification (e.g., `MkFoo :: forall a -> a -> Foo a`),
which improves the stderr in the `T16326_Fail6` test case.
Fixes #18191. Bumps the Haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47e6442bc4be4a33339499d876792ba109e8d32">a47e6442</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-10T03:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always use rnImplicitBndrs to bring implicit tyvars into scope
This implements a first step towards #16762 by changing the renamer
to always use `rnImplicitBndrs` to bring implicitly bound type
variables into scope. The main change is in `rnFamInstEqn` and
`bindHsQTyVars`, which previously used _ad hoc_ methods of binding
their implicit tyvars.
There are a number of knock-on consequences:
* One of the reasons that `rnFamInstEqn` used an _ad hoc_ binding
mechanism was to give more precise source locations in
`-Wunused-type-patterns` warnings. (See
https://gitlab.haskell.org/ghc/ghc/issues/16762#note_273343 for an
example of this.) However, these warnings are actually a little
_too_ precise, since implicitly bound type variables don't have
exact binding sites like explicitly bound type variables do.
A similar problem existed for
"`Different names for the same type variable`" errors involving
implicit tyvars bound by `bindHsQTyVars`.
Therefore, we simply accept the less precise (but more accurate)
source locations from `rnImplicitBndrs` in `rnFamInstEqn` and
`bindHsQTyVars`. See
`Note [Source locations for implicitly bound type variables]` in
`GHC.Rename.HsType` for the full story.
* In order for `rnImplicitBndrs` to work in `rnFamInstEqn`, it needs
to be able to look up names from the parent class (in the event
that we are renaming an associated type family instance). As a
result, `rnImplicitBndrs` now takes an argument of type
`Maybe assoc`, which is `Just` in the event that a type family
instance is associated with a class.
* Previously, GHC kept track of three type synonyms for free type
variables in the renamer: `FreeKiTyVars`, `FreeKiTyVarsDups`
(which are allowed to contain duplicates), and
`FreeKiTyVarsNoDups` (which contain no duplicates). However, making
is a distinction between `-Dups` and `-NoDups` is now pointless, as
all code that returns `FreeKiTyVars{,Dups,NoDups}` will eventually
end up being passed to `rnImplicitBndrs`, which removes duplicates.
As a result, I decided to just get rid of `FreeKiTyVarsDups` and
`FreeKiTyVarsNoDups`, leaving only `FreeKiTyVars`.
* The `bindLRdrNames` and `deleteBys` functions are now dead code, so
I took the liberty of removing them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2487912938f188cb264e4a11d21bf750adccc5e7">24879129</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-10T03:39:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify leaf module names for new module hierarchy
This updates comments only.
This patch replaces leaf module names according to new module
hierarchy [1][2] as followings:
* Expand leaf names to easily find the module path:
for instance, `Id.hs` to `GHC.Types.Id`.
* Modify leaf names according to new module hierarchy:
for instance, `Convert.hs` to `GHC.ThToHs`.
* Fix typo:
for instance, `GHC.Core.TyCo.Rep.hs` to `GHC.Core.TyCo.Rep`
See also !3375
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: https://gitlab.haskell.org/ghc/ghc/issues/13009
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92de9e25aa1a6f7aa73154868521bcf4f0dc9d1e">92de9e25</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T03:41:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove unused GET_ENTRY closure macro
This macro is not used and got broken in the meantime, as ENTRY_CODE was
deleted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87102928cce33d9029ca4cc449dde6efc802b8ec">87102928</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T03:41:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -fkeep-cafs flag name in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccd6843d4a39920b4fa02badbe82e529390d4a74">ccd6843d</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-06-10T04:14:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose impliedGFlags, impledOffGFlags, impliedXFlags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a737e898014d92bdbeed2e1cf5c35fc0a91a547">7a737e89</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T04:14:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cross-module LambdaFormInfo passing
- Store LambdaFormInfos of exported Ids in interface files
- Use them in importing modules
This is for optimization purposes: if we know LambdaFormInfo of imported
Ids we can generate more efficient calling code, see `getCallMethod`.
Exporting (putting them in interface files or in ModDetails) and
importing (reading them from interface files) are both optional. We
don't assume known LambdaFormInfos anywhere and do not change how we
call Ids with unknown LambdaFormInfos.
Runtime, allocation, and residency numbers when building
Cabal-the-library (commit 0d4ee7ba3):
(Log and .hp files are in the MR: !2842)
| | GHC HEAD | This patch | Diff |
|-----|----------|------------|----------------|
| -O0 | 0:35.89 | 0:34.10 | -1.78s, -4.98% |
| -O1 | 2:24.01 | 2:23.62 | -0.39s, -0.27% |
| -O2 | 2:52.23 | 2:51.35 | -0.88s, -0.51% |
| | GHC HEAD | This patch | Diff |
|-----|-----------------|-----------------|----------------------------|
| -O0 | 54,843,608,416 | 54,878,769,544 | +35,161,128 bytes, +0.06% |
| -O1 | 227,136,076,400 | 227,569,045,168 | +432,968,768 bytes, +0.19% |
| -O2 | 266,147,063,296 | 266,749,643,440 | +602,580,144 bytes, +0.22% |
NOTE: Residency is measured with extra runtime args: `-i0 -h` which effectively
turn all GCs into major GCs, and do GC more often.
| | GHC HEAD | This patch | Diff |
|-----|----------------------------|------------------------------|----------------------------|
| -O0 | 410,284,000 (910 samples) | 411,745,008 (906 samples) | +1,461,008 bytes, +0.35% |
| -O1 | 928,580,856 (2109 samples) | 943,506,552 (2103 samples) | +14,925,696 bytes, +1.60% |
| -O2 | 993,951,352 (2549 samples) | 1,010,156,328 (2545 samples) | +16,204,9760 bytes, +1.63% |
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% +0.1%
VSM 0.0% 0.0% +0.0% +0.0% +0.0%
anna 0.0% 0.0% -0.3% -0.8% -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% -0.1% -0.3% 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% -0.2% 0.0%
cacheprof 0.0% 0.0% -0.1% -0.4% +0.0%
calendar 0.0% 0.0% -0.0% -0.0% 0.0%
cichelli 0.0% 0.0% -0.9% -2.4% 0.0%
circsim 0.0% 0.0% -0.0% -0.0% 0.0%
clausify 0.0% 0.0% -0.1% -0.3% 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% -0.1% -0.2% -0.0%
cryptarithm1 0.0% 0.0% -0.0% -0.0% 0.0%
cryptarithm2 0.0% 0.0% -1.4% -4.1% -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% -0.1% -0.2% 0.0%
eliza 0.0% 0.0% -0.5% -1.5% 0.0%
event 0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals 0.0% 0.0% -0.1% -0.3% +0.0%
exp3_8 0.0% 0.0% -0.0% -0.0% -0.0%
expert 0.0% 0.0% -0.3% -1.0% -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% -0.4% -1.2% +0.0%
fulsom 0.0% 0.0% -0.0% -0.0% 0.0%
gamteb 0.0% 0.0% -0.1% -0.3% 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% -0.1% -0.4% -0.0%
hpg 0.0% 0.0% -0.2% -0.5% +0.0%
ida 0.0% 0.0% -0.0% -0.0% +0.0%
infer 0.0% 0.0% -0.3% -0.8% -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% -2.2% -5.4% 0.0%
lambda 0.0% 0.0% -0.6% -1.8% 0.0%
last-piece 0.0% 0.0% -0.0% -0.0% 0.0%
lcss 0.0% 0.0% -0.0% -0.1% 0.0%
life 0.0% 0.0% -0.0% -0.1% 0.0%
lift 0.0% 0.0% -0.2% -0.6% +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% -0.1% -0.3% +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% -0.2% -1.0% 0.0%
mkhprog 0.0% 0.0% -0.1% -0.2% -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% -0.1% -0.2% 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 0.0% 0.0% -0.2% -0.7% 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% -0.2% -0.6% +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% -0.3% -1.1% 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% -0.7% -2.5% -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% -0.1% -0.2% -0.0%
sched 0.0% 0.0% -0.0% -0.0% -0.0%
scs 0.0% 0.0% -1.0% -2.6% +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% -0.6% -1.6% 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% -0.2% -0.4% +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% -2.2% -5.4% -0.0%
Max +0.0% 0.0% +0.0% +0.0% +0.1%
Geometric Mean -0.0% -0.0% -0.1% -0.3% +0.0%
Metric increases micro benchmarks tracked in #17686:
Metric Increase:
T12150
T12234
T12425
T13035
T5837
T6048
T9233
Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b22b14a7a1c1819fc8682fc127acf7448c5630c">3b22b14a</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-06-10T04:15:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Give Language a Bounded instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9454511b0bdfcd79a1899d7f24bf65a3eb0d06e3">9454511b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-10T04:17:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimisation in Unique.Supply
This patch switches on -fno-state-hack in GHC.Types.Unique.Supply.
It turned out that my fixes for #18078 (coercion floating) changed the
optimisation pathway for mkSplitUniqSupply in such a way that we had
an extra allocation inside the inner loop. Adding -fno-state-hack
fixed that -- and indeed the loop in mkSplitUniqSupply is a classic
example of the way in which -fno-state-hack can be bad; see #18238.
Moreover, the new code is better than the old. They allocate
the same, but the old code ends up with a partial application.
The net effect is that the test
perf/should_run/UniqLoop
runs 20% faster! From 2.5s down to 2.0s. The allocation numbers
are the same -- but elapsed time falls. Good!
The bad thing about this is that it's terribly delicate. But
at least it's a good example of such delicacy in action.
There is a long Note [Optimising the unique supply] which now
explains all this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d49d5be904c0c01788fa7aae1b112d5b4dfaf1c">6d49d5be</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-10T04:17:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cast worker/wrapper properly
The cast worker/wrapper transformation transforms
x = e |> co
into
y = e
x = y |> co
This is done by the simplifier, but we were being
careless about transferring IdInfo from x to y,
and about what to do if x is a NOINLNE function.
This resulted in a series of bugs:
#17673, #18093, #18078.
This patch fixes all that:
* Main change is in GHC.Core.Opt.Simplify, and
the new prepareBinding function, which does this
cast worker/wrapper transform.
See Note [Cast worker/wrappers].
* There is quite a bit of refactoring around
prepareRhs, makeTrivial etc. It's nicer now.
* Some wrappers from strictness and cast w/w, notably those for
a function with a NOINLINE, should inline very late. There
wasn't really a mechanism for that, which was an existing bug
really; so I invented a new finalPhase = Phase (-1). It's used
for all simplifier runs after the user-visible phase 2,1,0 have
run. (No new runs of the simplifier are introduced thereby.)
See new Note [Compiler phases] in GHC.Types.Basic;
the main changes are in GHC.Core.Opt.Driver
* Doing this made me trip over two places where the AnonArgFlag on a
FunTy was being lost so we could end up with (Num a -> ty)
rather than (Num a => ty)
- In coercionLKind/coercionRKind
- In contHoleType in the Simplifier
I fixed the former by defining mkFunctionType and using it in
coercionLKind/RKind.
I could have done the same for the latter, but the information
is almost to hand. So I fixed the latter by
- adding sc_hole_ty to ApplyToVal (like ApplyToTy),
- adding as_hole_ty to ValArg (like TyArg)
- adding sc_fun_ty to StrictArg
Turned out I could then remove ai_type from ArgInfo. This is
just moving the deck chairs around, but it worked out nicely.
See the new Note [AnonArgFlag] in GHC.Types.Var
* When looking at the 'arity decrease' thing (#18093) I discovered
that stable unfoldings had a much lower arity than the actual
optimised function. That's what led to the arity-decrease
message. Simple solution: eta-expand.
It's described in Note [Eta-expand stable unfoldings]
in GHC.Core.Opt.Simplify
* I also discovered that unsafeCoerce wasn't being inlined if
the context was boring. So (\x. f (unsafeCoerce x)) would
create a thunk -- yikes! I fixed that by making inlineBoringOK
a bit cleverer: see Note [Inline unsafeCoerce] in GHC.Core.Unfold.
I also found that unsafeCoerceName was unused, so I removed it.
I made a test case for #18078, and a very similar one for #17673.
The net effect of all this on nofib is very modest, but positive:
--------------------------------------------------------------------------------
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
anna -0.4% -0.1% -3.1% -3.1% 0.0%
fannkuch-redux -0.4% -0.3% -0.1% -0.1% 0.0%
maillist -0.4% -0.1% -7.8% -1.0% -14.3%
primetest -0.4% -15.6% -7.1% -6.6% 0.0%
--------------------------------------------------------------------------------
Min -0.9% -15.6% -13.3% -14.2% -14.3%
Max -0.3% 0.0% +12.1% +12.4% 0.0%
Geometric Mean -0.4% -0.2% -2.3% -2.2% -0.1%
All following metric decreases are compile-time allocation decreases
between -1% and -3%:
Metric Decrease:
T5631
T13701
T14697
T15164
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32fd37f5e1e6dc6e3b664ae41e0041ed8a19ae21">32fd37f5</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2020-06-10T04:17:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix lookupGlobalOccRn_maybe sometimes reporting an error
In some cases it was possible for lookupGlobalOccRn_maybe to return an
error, when it should be returning a Nothing. If it called
lookupExactOcc_either when there were no matching GlobalRdrElts in the
otherwise case, it would return an error message. This could be caused
when lookupThName_maybe in Template Haskell was looking in different
namespaces (thRdrNameGuesses), guessing different namespaces that the
name wasn't guaranteed to be found in.
However, by addressing this some more accurate errors were being lost in
the conversion to Maybes. So some of the lookup* functions have been
shuffled about so that errors should always be ignored in
lookup*_maybes, and propagated otherwise.
This fixes #18263
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b283e1b2a46af614d89b0e3a0dfd23871511c17">9b283e1b</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-10T04:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Initialize the allocation counter in GHCi to 0 (Fixes #16012)
According to the documentation for the function `getAllocationCounter` in
[System.Mem](http://hackage.haskell.org/package/base-4.14.0.0/docs/System-Mem.html)
initialize the allocationCounter also in GHCi to 0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d07c48ce3fde32a3c08c84764e0859b84eee461">8d07c48c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-10T04:17:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test: fix conc038
We had spurious failures of conc038 test on CI with stdout:
```
newThread started
-mainThread
-Haskell: 2
newThread back again
+mainThread
1 sec later
shutting down
+Haskell: 2
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7e9689f6fcc3eb974f0a76ae8078abda30026d">4c7e9689</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-11T10:37:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Release Notes: Add news from the pattern-match checker [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3445b9652671280920755ee3d2b49780eeb3a991">3445b965</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only test T16190 with the NCG
T16190 is meant to test a NCG feature. It has already caused spurious
failures in other MRs (e.g. !2165) when LLVM is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2517a51c0f949c1021de9f7c16f67345c6ab78a9">2517a51c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags refactoring VIII (#17957)
* Remove several uses of `sdocWithDynFlags`, especially in GHC.Llvm.*
* Add LlvmOpts datatype to store Llvm backend options
* Remove Outputable instances (for LlvmVar, LlvmLit, LlvmStatic and
Llvm.MetaExpr) which require LlvmOpts.
* Rename ppMetaExpr into ppMetaAnnotExpr (pprMetaExpr is now used in place of `ppr :: MetaExpr -> SDoc`)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a02599afe836ac32c2e732671415d0afdfbf7fb">7a02599a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72d086106d49bc18277f3a066e671e87e9b37a1b">72d08610</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor homeUnit
* rename thisPackage into homeUnit
* document and refactor several Backpack things
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dc71f5577a541168951371bd55b51a588b57813">8dc71f55</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename unsafeGetUnitInfo into unsafeLookupUnit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6be6e432e53108075905c1fc7785d8b1f18a33f">f6be6e43</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add allowVirtualUnits field in PackageState
Instead of always querying DynFlags to know whether we are allowed to
use virtual units (i.e. instantiated on-the-fly, cf Note [About units]
in GHC.Unit), we store it once for all in
`PackageState.allowVirtualUnits`.
This avoids using DynFlags too much (cf #17957) and is preliminary work
for #14335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7272d53e67e72580caceae40e766c4bfeb1c398">e7272d53</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance UnitId use
* use UnitId instead of String to identify wired-in units
* use UnitId instead of Unit in the backend (Unit are only use by
Backpack to produce type-checked interfaces, not real code)
* rename lookup functions for consistency
* documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c5572cd29924dcc6effd8e102c9bb30d7b39bec">9c5572cd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove LinkerUnitId type alias
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d345edfe96a3fdf35b8e953c1a4aacc325ca948e">d345edfe</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor WiredMap
* Remove WiredInUnitId and WiredUnitId type aliases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d171cd6d5cfbc8eae12cd1b152541d4f285b245">3d171cd6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document and refactor `mkUnit` and `mkUnitInfoMap`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2109b4f10ddbe09ac3397486922142f0cadaacc">d2109b4f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove PreloadUnitId type alias
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f50c19b8a78da9252cb39f49c1c66db4a684cc3b">f50c19b8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename listUnitInfoMap into listUnitInfo
There is no Map involved
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed533ec217667423e4fce30040f24053dbcc7de4">ed533ec2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Package into Unit
The terminology changed over time and now package databases contain
"units" (there can be several units compiled from a single Cabal
package: one per-component, one for each option set, one per
instantiation, etc.). We should try to be consistent internally and use
"units": that's what this renaming does. Maybe one day we'll fix the UI
too (e.g. replace -package-id with -unit-id, we already have
-this-unit-id and ghc-pkg has -unit-id...) but it's not done in this
patch.
* rename getPkgFrameworkOpts into getUnitFrameworkOpts
* rename UnitInfoMap into ClosureUnitInfoMap
* rename InstalledPackageIndex into UnitInfoMap
* rename UnusablePackages into UnusableUnits
* rename PackagePrecedenceIndex into UnitPrecedenceMap
* rename PackageDatabase into UnitDatabase
* rename pkgDatabase into unitDatabases
* rename pkgState into unitState
* rename initPackages into initUnits
* rename renamePackage into renameUnitInfo
* rename UnusablePackageReason into UnusableUnitReason
* rename getPackage* into getUnit*
* etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/202728e529f2faa88731b9f4b34b2ac567eb7c95">202728e5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make ClosureUnitInfoMap uses UnitInfoMap
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55b4263e1a53cc27b1da9227249bdcd20139ddc9">55b4263e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove ClosureUnitInfoMap
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/653d17bdd57ec8ca9b11b19e45860982bd1e7c9e">653d17bd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Package into Unit (2)
* rename PackageState into UnitState
* rename findWiredInPackages into findWiredInUnits
* rename lookupModuleInAll[Packages,Units]
* etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae900605c4860684c51584dac271956635eb60cc">ae900605</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move dump_mod_map into initUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/598cc1dde543807902fd502b5e2f8050ebac1fa5">598cc1dd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move wiring of homeUnitInstantiations outside of mkUnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/437265eb26b45a2de3ac537b6bc9a81986d4f7ae">437265eb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid timing module map dump in initUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9400aa934880695b83201e192998de2576cfdf92">9400aa93</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove preload parameter of mkUnitState
* Remove preload parameter (unused)
* Don't explicitly return preloaded units: redundant because already
returned as "preloadUnits" field of UnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/266bc3d9c3735620598ab18ff6ac9c44134cbbff">266bc3d9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: refactor unwireUnit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e715c1b84702dc60fe31fd19dacf85335d59b27">9e715c1b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document getPreloadUnitsAnd
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd5810dc4e23331ca4f73ec3b1818c3350b5bbd7">bd5810dc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove useless add_package parameter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/36e1daf0a604d98a34d9a066a01dd4f5439b4aca">36e1daf0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: make listVisibleModuleNames take a UnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5226da37845ae82bff0e3e6b16be7453e3d9370d">5226da37</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor and document add_package
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b53aac1e2128fa9baa5fd4623fcb3afd2602870">4b53aac1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor and document closeUnitDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42c054f6cd7a9890c3e9d2d0c444252abe08a8d5">42c054f6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: findWiredInUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a444d01bc97be99b7743b752a33ca9982de4c0f1">a444d01b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: reportCycles, reportUnusable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8408d521a67e2af4012d886d6a7e2af02ce42add">8408d521</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: merge_databases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fca2d25ff76d442d0825847643ed7448492e0e55">fca2d25f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add UnitConfig datatype
Avoid directly querying flags from DynFlags to build the UnitState.
Instead go via UnitConfig so that we could reuse this to make another
UnitState for plugins.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4274688a6333abffdfe7c7bda252c566f947afdf">4274688a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move distrustAll into mkUnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28d804e1e12a6be9bcd94b4667e27ba73beade38">28d804e1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create helper upd_wired_in_home_instantiations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac964c8350ba41082e9dca9cf1b7ff02aea2a636">ac964c83</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put database cache in UnitConfig
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfd0a78cdd0287c26998a4d9419174e4dc305c6f">bfd0a78c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't return preload units when we set DyNFlags
Preload units can be retrieved in UnitState when needed (i.e. in GHCi)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1fbb4bf5f3d31f115e5a824588efc529cebf3185">1fbb4bf5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCGConfig: remove useless ncgUnitId field
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c10ff7e7e5e5bd687938b5a4256e980cf58fcad1">c10ff7e7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Doc: fix some comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/456e17f035238984e487870fe8007f5fb5f726cf">456e17f0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haddock submodule and allow metric decrease
Metric Decrease:
T12150
T12234
T5837
Metric Increase:
T16190
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/429539025450757e30124fa9ee33206deeb951a2">42953902</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Trim the demand for recursive product types
Ticket #18304 showed that we need to be very careful
when exploring the demand (esp usage demand) on recursive
product types.
This patch solves the problem by trimming the demand on such types --
in effect, a form of "widening".
See the Note [Trimming a demand to a type] in DmdAnal, which explains
how I did this by piggy-backing on an existing mechansim for trimming
demands becuase of GADTs. The significant payload of this patch is
very small indeed:
* Make GHC.Core.Opt.WorkWrap.Utils.typeShape use RecTcChecker to
avoid looking through recursive types.
But on the way
* I found that ae_rec_tc was entirely inoperative and did nothing.
So I removed it altogether from DmdAnal.
* I moved some code around in DmdAnal and Demand.
(There are no actual changes in dmdFix.)
* I changed the API of DmsAnal.dmdAnalRhsLetDown to return
a StrictSig rather than a decorated Id
* I removed the dead function peelTsFuns from Demand
Performance effects:
Nofib: 0.0% changes. Not surprising, because they don't
use recursive products
Perf tests
T12227:
1% increase in compiler allocation, becuase $cto gets w/w'd.
It did not w/w before because it takes a deeply nested
argument, so the worker gets too many args, so we abandon w/w
altogether (see GHC.Core.Opt.WorkWrap.Utils.isWorkerSmallEnough)
With this patch we trim the demands. That is not strictly
necessary (since these Generic type constructors are like
tuples -- they can't cause a loop) but the net result is that
we now w/w $cto which is fine.
UniqLoop:
16% decrease in /runtime/ allocation. The UniqSupply is a
recursive product, so currently we abandon all strictness on
'churn'. With this patch 'churn' gets useful strictness, and
we w/w it. Hooray
Metric Decrease:
UniqLoop
Metric Increase:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87d504f475471c61305b29578da2656f9ff9653e">87d504f4</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-06-13T02:13:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add introductory prose for Data.Traversable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f09b608eecf07ad6c27729f7b6f74aca4e17e6c">9f09b608</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-13T02:13:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #12073: Add MonadFix Q instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/220c2d34a34727d696cc4b44a1b87aba83231ce4">220c2d34</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T02:13:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase size of T12150
As noted in #18319, this test was previously very fragile. Increase its
size to make it more likely that its fails with its newly-increased
acceptance threshold.
Metric Increase:
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bba1c26193e704d2d6bb2be9a2fac668b0ea54c">8bba1c26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T04:59:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always push perf notes
Previously we ci.sh would run with `set -e` implying that we wouldn't
push perf notes if the testsuite were to fail, even if it *only* failed
due to perf notes. This rendered the whole performance testing story
quite fragile as a single regressing commit would cause every successive
commit to fail since a new baseline would not be uploaded.
Fix this by ensuring that we always push performance notes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a773f169cfe072c7b29924c53075e4dfa4e2adb">7a773f16</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T15:10:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Eliminate redundant push of CI metrics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a31218f7737a65b6333ec7905e88dc094703f025">a31218f7</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-13T15:58:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use HsForAllTelescope to avoid inferred, visible foralls
Currently, `HsForAllTy` permits the combination of `ForallVis` and
`Inferred`, but you can't actually typecheck code that uses it
(e.g., `forall {a} ->`). This patch refactors `HsForAllTy` to use a
new `HsForAllTelescope` data type that makes a type-level distinction
between visible and invisible `forall`s such that visible `forall`s
do not track `Specificity`. That part of the patch is actually quite
small; the rest is simply changing consumers of `HsType` to
accommodate this new type.
Fixes #18235. Bumps the `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0e6dee99242eff08420176a36d77b715972f1f2">c0e6dee9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-06-14T09:07:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add Atomic Exchange PrimOp and implement Atomic Ptr exchanges.
The initial version was rewritten by Tamar Christina.
It was rewritten in large parts by Andreas Klebinger.
Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a7462fb6b8bdd6326a607bbd7b9453eb588193b">9a7462fb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">codeGen: Don't discard live case binders in unsafeEqualityProof logic
Previously CoreToStg would unconditionally discard cases of the form:
case unsafeEqualityProof of wild { _ -> rhs }
and rather replace the whole thing with `rhs`. However, in some cases
(see #18227) the case binder is still live, resulting in unbound
occurrences in `rhs`. Fix this by only discarding the case if the case
binder is dead.
Fixes #18227.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4137c486a3df66b49395beea7efc6e200cc9bac">e4137c48</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add tests for #18227
T18227A is the original issue which gave rise to the ticket and depends
upon bytestring. T18227B is a minimized reproducer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bab9ff1e09c1566a4105146bd636634a24928b9">8bab9ff1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix rts include and library paths
Fixes two bugs:
* (?) and (<>) associated in a surprising way
* We neglected to include libdw paths in the rts configure flags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd761185561747fe0b3adc22602f75d7b50cd248">bd761185</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop redundant GHC arguments
Cabal should already be passing this arguments to GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01f7052cc182c0ced85522dc775ebc490bf094ce">01f7052c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-06-14T15:36:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FFI: Fix pass small ints in foreign call wrappers
The Haskell calling convention requires integer parameters smaller
than wordsize to be promoted to wordsize (where the upper bits are
don't care). To access such small integer parameter read a word from
the parameter array and then cast that word to the small integer
target type.
Fixes #15933
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/502647f7583be626319482adf4ea3d905db0006d">502647f7</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-14T15:37:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix "ndecreasingIndentation" in manual (#18116)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a9cc0897b676ffd6612562a46600ea98c53a58d">9a9cc089</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-06-15T13:10:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldl' in unionManyUniqDSets
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/761dcb84cd4c50c6fbb361eb26fb429af87392a3">761dcb84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-15T13:10:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Load .lo as well.
Some archives contain so called linker objects, with the affectionate
.lo suffic. For example the musl libc.a will come in that form. We
still want to load those objects, hence we should not discard them and
look for .lo as well. Ultimately we might want to fix this proerly by
looking at the file magic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf01477f03da13caaf78caacc5b001cb46a86685">cf01477f</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-15T13:11:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">User's Guide: KnownNat evidence is Natural
This bit of documentation got outdated after commit
1fcede43d2b30f33b7505e25eb6b1f321be0407f
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0dcbfe646e52d0a1ef6d6e59a059323485775eb">d0dcbfe6</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos and formatting in user guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56a9e95fd6c2f213d676c9a2bd0a6cf93c531dbb">56a9e95f</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Resolve TODO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e884d14102948ad49d75611da247beff25911a4">3e884d14</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename TcHoleErrors to GHC.Tc.Errors.Hole
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d23fc67847a27222ad8a0c193e6a10b5a4c0cf48">d23fc678</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-06-17T15:31:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Build with threaded runtime if available
See #16873.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0639dc10e214280a90dd6b75ce86cf43d1eb2286">0639dc10</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T15:31:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T16190: only measure bytes_allocated
Just adding `{-# LANGUAGE BangPatterns #-}` makes the two other metrics
fluctuate by 13%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4cab68974dba3e674016514c939946ce60e58273">4cab6897</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-06-17T15:32:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fix formatting in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb8115a8c4cbc842b66798480fefc7ab64d31931">eb8115a8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T15:33:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move CLabel assertions into smart constructors (#17957)
It avoids using DynFlags in the Outputable instance of Clabel to check
assertions at pretty-printing time.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7faa4509cd7dbc6e2f873e4997e8888bd6ec3507">7faa4509</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-17T15:43:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Bump to 4.15.0.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20616959a7f4821034e14a64c3c9bf288c9bc956">20616959</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-17T15:43:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Use grep -q instead of --quiet
The latter is apparently not supported by busybox.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40fa237e1daab7a76b9871bb6c50b953a1addf23">40fa237e</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-17T16:21:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types (#15981)
This is the first step towards implementation of the linear types proposal
(https://github.com/ghc-proposals/ghc-proposals/pull/111).
It features
* A language extension -XLinearTypes
* Syntax for linear functions in the surface language
* Linearity checking in Core Lint, enabled with -dlinear-core-lint
* Core-to-core passes are mostly compatible with linearity
* Fields in a data type can be linear or unrestricted; linear fields
have multiplicity-polymorphic constructors.
If -XLinearTypes is disabled, the GADT syntax defaults to linear fields
The following items are not yet supported:
* a # m -> b syntax (only prefix FUN is supported for now)
* Full multiplicity inference (multiplicities are really only checked)
* Decent linearity error messages
* Linear let, where, and case expressions in the surface language
(each of these currently introduce the unrestricted variant)
* Multiplicity-parametric fields
* Syntax for annotating lambda-bound or let-bound with a multiplicity
* Syntax for non-linear/multiple-field-multiplicity records
* Linear projections for records with a single linear field
* Linear pattern synonyms
* Multiplicity coercions (test LinearPolyType)
A high-level description can be found at
https://ghc.haskell.org/trac/ghc/wiki/LinearTypes/Implementation
Following the link above you will find a description of the changes made to Core.
This commit has been authored by
* Richard Eisenberg
* Krzysztof Gogolewski
* Matthew Pickering
* Arnaud Spiwack
With contributions from:
* Mark Barbone
* Alexander Vershilov
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6cb84c469bf1ab6b03e099f5d100e78800ca09e0">6cb84c46</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Various performance improvements
This implements several general performance improvements to GHC,
to offset the effect of the linear types change.
General optimisations:
- Add a `coreFullView` function which iterates `coreView` on the
head. This avoids making function recursive solely because the
iterate `coreView` themselves. As a consequence, this functions can
be inlined, and trigger case-of-known constructor (_e.g._
`kindRep_maybe`, `isLiftedRuntimeRep`, `isMultiplicityTy`,
`getTyVar_maybe`, `splitAppTy_maybe`, `splitFunType_maybe`,
`tyConAppTyCon_maybe`). The common pattern about all these functions
is that they are almost always used as views, and immediately
consumed by a case expression. This commit also mark them asx `INLINE`.
- In `subst_ty` add a special case for nullary `TyConApp`, which avoid
allocations altogether.
- Use `mkTyConApp` in `subst_ty` for the general `TyConApp`. This
required quite a bit of module shuffling.
case. `myTyConApp` enforces crucial sharing, which was lost during
substitution. See also !2952 .
- Make `subst_ty` stricter.
- In `eqType` (specifically, in `nonDetCmpType`), add a special case,
tested first, for the very common case of nullary `TyConApp`.
`nonDetCmpType` has been made `INLINE` otherwise it is actually a
regression. This is similar to the optimisations in !2952.
Linear-type specific optimisations:
- Use `tyConAppTyCon_maybe` instead of the more complex `eqType` in
the definition of the pattern synonyms `One` and `Many`.
- Break the `hs-boot` cycles between `Multiplicity.hs` and `Type.hs`:
`Multiplicity` now import `Type` normally, rather than from the
`hs-boot`. This way `tyConAppTyCon_maybe` can inline properly in the
`One` and `Many` pattern synonyms.
- Make `updateIdTypeAndMult` strict in its type and multiplicity
- The `scaleIdBy` gets a specialised definition rather than being an
alias to `scaleVarBy`
- `splitFunTy_maybe` is given the type `Type -> Maybe (Mult, Type,
Type)` instead of `Type -> Maybe (Scaled Type, Type)`
- Remove the `MultMul` pattern synonym in favour of a view `isMultMul`
because pattern synonyms appear not to inline well.
- in `eqType`, in a `FunTy`, compare multiplicities last: they are
almost always both `Many`, so it helps failing faster.
- Cache `manyDataConTy` in `mkTyConApp`, to make sure that all the
instances of `TyConApp ManyDataConTy []` are physically the same.
This commit has been authored by
* Richard Eisenberg
* Krzysztof Gogolewski
* Arnaud Spiwack
Metric Decrease:
haddock.base
T12227
T12545
T12990
T1969
T3064
T5030
T9872b
Metric Increase:
haddock.base
haddock.Cabal
haddock.compiler
T12150
T12234
T12425
T12707
T13035
T13056
T15164
T16190
T18304
T1969
T3064
T3294
T5631
T5642
T5837
T6048
T9020
T9233
T9675
T9872a
T9961
WWRec
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57db91d8ee501c7cf176c4bb1e2101d3092fd0f6">57db91d8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove integer-simple
integer-simple uses lists of words (`[Word]`) to represent big numbers
instead of ByteArray#:
* it is less efficient than the newer ghc-bignum native backend
* it isn't compatible with the big number representation that is now
shared by all the ghc-bignum backends (based on the one that was
used only in integer-gmp before).
As a consequence, we simply drop integer-simple
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f96bc127d6231b5e76bbab442244eb303b08867">9f96bc12</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum library
ghc-bignum is a newer package that aims to replace the legacy
integer-simple and integer-gmp packages.
* it supports several backends. In particular GMP is still supported and
most of the code from integer-gmp has been merged in the "gmp"
backend.
* the pure Haskell "native" backend is new and is much faster than the
previous pure Haskell implementation provided by integer-simple
* new backends are easier to write because they only have to provide a
few well defined functions. All the other code is common to all
backends. In particular they all share the efficient small/big number
distinction previously used only in integer-gmp.
* backends can all be tested against the "native" backend with a simple
Cabal flag. Backends are only allowed to differ in performance, their
results should be the same.
* Add `integer-gmp` compat package: provide some pattern synonyms and
function aliases for those in `ghc-bignum`. It is intended to avoid
breaking packages that depend on `integer-gmp` internals.
Update submodules: text, bytestring
Metric Decrease:
Conversions
ManyAlternatives
ManyConstructors
Naperian
T10359
T10547
T10678
T12150
T12227
T12234
T12425
T13035
T13719
T14936
T1969
T4801
T4830
T5237
T5549
T5837
T8766
T9020
parsing001
space_leak_001
T16190
haddock.base
On ARM and i386, T17499 regresses (+6% > 5%).
On x86_64 unregistered, T13701 sometimes regresses (+2.2% > 2%).
Metric Increase:
T17499
T13701
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96aa57878fd6e6a7b92e841a0df8b5255a559c97">96aa5787</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update compiler
Thanks to ghc-bignum, the compiler can be simplified:
* Types and constructors of Integer and Natural can be wired-in. It
means that we don't have to query them from interfaces. It also means
that numeric literals don't have to carry their type with them.
* The same code is used whatever ghc-bignum backend is enabled. In
particular, conversion of bignum literals into final Core expressions
is now much more straightforward. Bignum closure inspection too.
* GHC itself doesn't depend on any integer-* package anymore
* The `integerLibrary` setting is gone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f67e3447e5a0089b5348940d404ed876fddddfc">0f67e344</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update `base` package
* GHC.Natural isn't implemented in `base` anymore. It is provided by
ghc-bignum in GHC.Num.Natural. It means that we can safely use Natural
primitives in `base` without fearing issues with built-in rewrite
rules (cf #15286)
* `base` doesn't conditionally depend on an integer-* package anymore,
it depends on ghc-bignum
* Some duplicated code in integer-* can now be factored in GHC.Float
* ghc-bignum tries to use a uniform naming convention so most of the
other changes are renaming
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa9e7b7196f03f84579e3b4a09068c668cbe6ffb">aa9e7b71</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update `make` based build system
* replace integer-* package selection with ghc-bignum backend selection
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f817d816e60a487bca64037095c01e9956225b64">f817d816</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update testsuite
* support detection of slow ghc-bignum backend (to replace the detection
of integer-simple use). There are still some test cases that the
native backend doesn't handle efficiently enough.
* remove tests for GMP only functions that have been removed from
ghc-bignum
* fix test results showing dependent packages (e.g. integer-gmp) or
showing suggested instances
* fix test using Integer/Natural API or showing internal names
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dceecb093c3ee1e4dc970bb6669ff855ec37f6ac">dceecb09</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Hadrian
* support ghc-bignum backend selection in flavours and command-line
* support ghc-bignum "--check" flag (compare results of selected backend
against results of the native one) in flavours and command-line (e.g.
pass --bignum=check-gmp" to check the "gmp" backend)
* remove the hack to workaround #15286
* build GMP only when the gmp backend is used
* remove hacks to workaround `text` package flags about integer-*. We
fix `text` to use ghc-bignum unconditionally in another patch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4281d672e462b8421098b3506bd3c4c6a1f819">fa4281d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump bytestring and text submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a3f6f348004a80d3d7add81b22e4217b648b145">1a3f6f34</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-06-18T23:03:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: mention -hiedir in docs for -outputdir
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/729bcb02716593ae46d7baecce4776b3f353e3f7">729bcb02</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:04:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix build on Mac OS Catalina (#17798)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95e18292731cd799e024976f11c18fdf34bcb777">95e18292</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-18T23:04:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Relax allocation threshold for T12150.
This test performs little work, so the most minor allocation
changes often cause the test to fail.
Increasing the threshold to 2% should help with this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ce6c393888fad5d52dfe0bff9b72cd1cf9facc0">8ce6c393</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-18T23:05:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Bump pinned cabal.project to an existent index-state
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08c1cb0f30770acbf366423f085f8ef92f7f6a06">08c1cb0f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-18T23:06:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix uninitialized field read in Linker.c
Valgrind report of the bug when running the test `linker_unload`:
==29666== Conditional jump or move depends on uninitialised value(s)
==29666== at 0x369C5B4: setOcInitialStatus (Linker.c:1305)
==29666== by 0x369C6C5: mkOc (Linker.c:1347)
==29666== by 0x36C027A: loadArchive_ (LoadArchive.c:522)
==29666== by 0x36C0600: loadArchive (LoadArchive.c:626)
==29666== by 0x2C144CD: ??? (in /home/omer/haskell/ghc_2/testsuite/tests/rts/linker/linker_unload.run/linker_unload)
==29666==
==29666== Conditional jump or move depends on uninitialised value(s)
==29666== at 0x369C5B4: setOcInitialStatus (Linker.c:1305)
==29666== by 0x369C6C5: mkOc (Linker.c:1347)
==29666== by 0x369C9F6: preloadObjectFile (Linker.c:1507)
==29666== by 0x369CA8D: loadObj_ (Linker.c:1536)
==29666== by 0x369CB17: loadObj (Linker.c:1557)
==29666== by 0x3866BC: main (linker_unload.c:33)
The problem is `mkOc` allocates a new `ObjectCode` and calls
`setOcInitialStatus` without initializing the `status` field.
`setOcInitialStatus` reads the field as first thing:
static void setOcInitialStatus(ObjectCode* oc) {
if (oc->status == OBJECT_DONT_RESOLVE)
return;
if (oc->archiveMemberName == NULL) {
oc->status = OBJECT_NEEDED;
} else {
oc->status = OBJECT_LOADED;
}
}
`setOcInitialStatus` is unsed in two places for two different purposes:
in `mkOc` where we don't have the `status` field initialized yet (`mkOc`
is supposed to initialize it), and `loadOc` where we do have `status`
field initialized and we want to update it. Instead of splitting the
function into two functions which are both called just once I inline the
functions in the use sites and remove it.
Fixes #18342
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da18ff9935e72c7fe6127cb5d5d0c53654a204b0">da18ff99</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-06-18T23:07:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix windows bootstrap due to linker changes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2af0ec9059b94e1fa6b37eda60216e0222e1a53d">2af0ec90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: store default depth in SDocContext (#17957)
It avoids having to use DynFlags to reach for pprUserLength.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4a0be758003f32b9d9d89cfd14b9839ac002f4d">d4a0be75</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:08:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move tablesNextToCode field into Platform
tablesNextToCode is a platform setting and doesn't belong into DynFlags
(#17957). Doing this is also a prerequisite to fix #14335 where we deal
with two platforms (target and host) that may have different platform
settings.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/809caedffe489931efa8c96a60eaed6d7ff739b9">809caedf</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-06-23T22:47:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch from HscSource to IsBootInterface for module lookup in GhcMake
We look up modules by their name, and not their contents. There is no
way to separately reference a signature vs regular module; you get what
you get. Only boot files can be referenced indepenently with `import {-#
SOURCE #-}`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7750bd456f32c3e91b9165587fe290122b9c2444">7750bd45</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cmm: introduce SAVE_REGS/RESTORE_REGS
We don't want to save both Fn and Dn register sets on x86-64 as they are
aliased to the same arch register (XMMn).
Moreover, when SAVE_STGREGS was used in conjunction with `jump foo [*]`
which makes a set of Cmm registers alive so that they cover all arch
registers used to pass parameter, we could have Fn, Dn and XMMn alive at
the same time. It made the LLVM code generator choke (see #17920).
Now `SAVE_REGS/RESTORE_REGS` and `jump foo [*]` use the same set of
registers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2636794d1a1d0c4c2666d5afb002b0ba73600f8a">2636794d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToC: don't add extern decl to parsed Cmm data
Previously, if a .cmm file *not in the RTS* contained something like:
```cmm
section "rodata" { msg : bits8[] "Test\n"; }
```
It would get compiled by CmmToC into:
```c
ERW_(msg);
const char msg[] = "Test\012";
```
and fail with:
```
/tmp/ghc32129_0/ghc_4.hc:5:12: error:
error: conflicting types for \u2018msg\u2019
const char msg[] = "Test\012";
^~~
In file included from /tmp/ghc32129_0/ghc_4.hc:3:0: error:
/tmp/ghc32129_0/ghc_4.hc:4:6: error:
note: previous declaration of \u2018msg\u2019 was here
ERW_(msg);
^
/builds/hsyl20/ghc/_build/install/lib/ghc-8.11.0.20200605/lib/../lib/x86_64-linux-ghc-8.11.0.20200605/rts-1.0/include/Stg.h:253:46: error:
note: in definition of macro \u2018ERW_\u2019
#define ERW_(X) extern StgWordArray (X)
^
```
See the rationale for this on https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/compiler/backends/ppr-c#prototypes
Now we don't generate these extern declarations (ERW_, etc.) for
top-level data. It shouldn't change anything for the RTS (the only place
we use .cmm files) as it is already special cased in
`GHC.Cmm.CLabel.needsCDecl`. And hand-written Cmm can use explicit
extern declarations when needed.
Note that it allows `cgrun069` test to pass with CmmToC (cf #15467).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f6a0665512717271ac2b249d107e2a0cb18ae86">5f6a0665</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: refactor and comment register padding code (#17920)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cad62ef11972490b180fad3cd4a5c7754fa218e4">cad62ef1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #17920
Metric Decrease:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7">a2a9006b</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-06-23T22:48:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix issue #18262 by zonking constraints after solving
Zonk residual constraints in checkForExistence to reveal user type
errors.
Previously when `:instances` was used with instances that have TypeError
constraints the result would look something like:
instance [safe] s0 => Err 'A -- Defined at ../Bug2.hs:8:10
whereas after zonking, `:instances` now sees the `TypeError` and
properly eliminates the constraint from the results.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/181516bcd6f18f22e1df3915bfca0c36524a725b">181516bc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-23T22:49:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in Simplify.simplCast
This bug, revealed by #18347, is just a missing update to
sc_hole_ty in simplCast. I'd missed a code path when I
made the recentchanges in
commit 6d49d5be904c0c01788fa7aae1b112d5b4dfaf1c
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Thu May 21 12:53:35 2020 +0100
Implement cast worker/wrapper properly
The fix is very easy.
Two other minor changes
* Tidy up in SimpleOpt.simple_opt_expr. In fact I think this is an
outright bug, introduced in the fix to #18112: we were simplifying
the same coercion twice *with the same substitution*, which is just
wrong. It'd be a hard bug to trigger, so I just fixed it; less code
too.
* Better debug printing of ApplyToVal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/625a7f5465d51d054c6930772412bad7d87189c5">625a7f54</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-23T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Two small tweaks to Coercion.simplifyArgsWorker
These tweaks affect the inner loop of simplifyArgsWorker, which
in turn is called from the flattener in Flatten.hs. This is
a key perf bottleneck to T9872{a,b,c,d}.
These two small changes have a modest but useful benefit.
No change in functionality whatsoever.
Relates to #18354
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5768cce0214e20937f8e1d41ef1d9b5613b02ae">b5768cce</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:50:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use timesInt2# with GHC < 8.11 (fix #18358)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ad4085c22a8d5030545cc9e0fedd0784836ecbf">7ad4085c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix invalid printf format
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a1f34d37b47826e86343e368a5c00f1a4b1f2bce">a1f34d37</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-23T22:52:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing entry to freeNamesItem (#18369)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0379ec26599e15e3eb037384054c26002e178cf5">0379ec26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-24T21:53:20+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools.Process: Handle exceptions in readCreateProcessWithExitCode'
In #18069 we are observing MVar deadlocks from somewhere in ghc.exe.
This use of MVar stood out as being one of the more likely culprits.
Here we make sure that it is exception-safe.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#70f0e3f682e0543f692942cb7bafd17134d6b88b">
<span class="new-file">
+
.git-ignore-revs
</span>
</a>
</li>
<li class="file-stats">
<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
</a>
</li>
<li class="file-stats">
<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
</a>
</li>
<li class="file-stats">
<a href="#b25b374c2459de3e2aaed42163f492c8b8614385">
.gitlab/merge_request_templates/merge-request.md
</a>
</li>
<li class="file-stats">
<a href="#7445606fbf8f3683cd42bdc54b05d7a0bc2dfc44">
.gitmodules
</a>
</li>
<li class="file-stats">
<a href="#9ab3868b23ed5d5a6e12ef902049902556fa4009">
aclocal.m4
</a>
</li>
<li class="file-stats">
<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
compiler/GHC.hs
</a>
</li>
<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
compiler/GHC/Builtin/Names.hs
</a>
</li>
<li class="file-stats">
<a href="#57f535740df5928fb0193abc3b28ca771369d8fd">
<span class="deleted-file">
−
compiler/GHC/Builtin/Names.hs-boot
</span>
</a>
</li>
<li class="file-stats">
<a href="#06764eb0158306b83ab1998d18316392a51838c2">
compiler/GHC/Builtin/Names/TH.hs
</a>
</li>
<li class="file-stats">
<a href="#a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd">
compiler/GHC/Builtin/PrimOps.hs
</a>
</li>
<li class="file-stats">
<a href="#377cfd14c1f92357465df995ec6537b074051322">
compiler/GHC/Builtin/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#be7a5c9dc04ecfe7bedb2a2afcc2a51be6719577">
compiler/GHC/Builtin/Types.hs-boot
</a>
</li>
<li class="file-stats">
<a href="#8a5cd068459120cddf3814e7b9e02003b87647ba">
compiler/GHC/Builtin/Types/Prim.hs
</a>
</li>
<li class="file-stats">
<a href="#d95fdf6575459444666f72b2281534e0558a4ba0">
compiler/GHC/Builtin/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
</a>
</li>
<li class="file-stats">
<a href="#2f6f8d6d05acc04b08fff94df4b3996c65b87892">
compiler/GHC/ByteCode/Asm.hs
</a>
</li>
<li class="file-stats">
<a href="#16db773e94d0938489b415eb3231cadb2565b84d">
compiler/GHC/ByteCode/InfoTable.hs
</a>
</li>
<li class="file-stats">
<a href="#11e6f6a348be9920cecad0893a25350137524b4f">
compiler/GHC/ByteCode/Linker.hs
</a>
</li>
<li class="file-stats">
<a href="#f73a4fa90a8eb153bccdcfcc9f63c15edcd66785">
compiler/GHC/Cmm.hs
</a>
</li>
<li class="file-stats">
<a href="#db697f6aea9f93f1583f1d5c62d25570a1e07f73">
compiler/GHC/Cmm/CLabel.hs
</a>
</li>
<li class="file-stats">
<a href="#d088ba20f051734394bf7ca283f33ed8127bc8ab">
compiler/GHC/Cmm/CallConv.hs
</a>
</li>
<li class="file-stats">
<a href="#92b713d88390e6ea489e24b6cff8a3960384c0d0">
compiler/GHC/Cmm/DebugBlock.hs
</a>
</li>
<li class="file-stats">
<a href="#47cba74ae8965f1665cd11bf2b023760ea27594e">
compiler/GHC/Cmm/Info.hs
</a>
</li>
<li class="file-stats">
<a href="#066085df29cc928ac539d8feae6e5215cbbf1e14">
compiler/GHC/Cmm/LayoutStack.hs
</a>
</li>
<li class="file-stats">
<a href="#c898e00d01234ab22d3b485be68db3645f52f220">
compiler/GHC/Cmm/MachOp.hs
</a>
</li>
<li class="file-stats">
<a href="#90378e83c3a00a78bc0b3c01da111e0a787de451">
compiler/GHC/Cmm/Node.hs
</a>
</li>
<li class="file-stats">
<a href="#71e696f452eb493722d70306c6f304fc9b2f6a95">
compiler/GHC/Cmm/Parser.y
</a>
</li>
<li class="file-stats">
<a href="#d40f34584a7f4c0fa7587fb41f94a34bca0d1064">
compiler/GHC/Cmm/Pipeline.hs
</a>
</li>
<li class="file-stats">
<a href="#bbf4b351b327473b112c1d212f720f929c5ce247">
compiler/GHC/Cmm/Ppr.hs
</a>
</li>
</ul>
<h5>The diff was not included because it is too large.</h5>
</div>
<div class="footer" style="margin-top: 10px;">
<p style="font-size: small; color: #777;">
—
<br>
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e5072549841402ab84fd12fea22851d5584105aa...0379ec26599e15e3eb037384054c26002e178cf5">View it on GitLab</a>.
<br>
You're receiving this email because of your account on gitlab.haskell.org.
If you'd like to receive fewer emails, you can
adjust your notification settings.
</p>
</div>
</body>
</html>