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<h3>
Ben Gamari pushed to branch wip/T18302
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/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/03a708ba8e8c323b07d8d2e0115d6eb59987cc02">03a708ba</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-25T03:54:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable large address space optimization on windows.
Starting with Win 8.1/Server 2012 windows no longer preallocates
page tables for reserverd memory eagerly, which prevented us from
using this approach in the past.
We also try to allocate the heap high in the memory space.
Hopefully this makes it easier to allocate things in the low
4GB of memory that need to be there. Like jump islands for the
linker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e6d3d09d983337df30d12e5aaa96bae9b81b324">7e6d3d09</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">In `:break ident` allow out of scope and nested identifiers (Fix #3000)
This patch fixes the bug and implements the feature request of #3000.
1. If `Module` is a real module name and `identifier` a name of a
top-level function in `Module` then `:break Module.identifer` works
also for an `identifier` that is out of scope.
2. Extend the syntax for `:break identifier` to:
:break [ModQual.]topLevelIdent[.nestedIdent]...[.nestedIdent]
`ModQual` is optional and is either the effective name of a module or
the local alias of a qualified import statement.
`topLevelIdent` is the name of a top level function in the module
referenced by `ModQual`.
`nestedIdent` is optional and the name of a function nested in a let or
where clause inside the previously mentioned function `nestedIdent` or
`topLevelIdent`.
If `ModQual` is a module name, then `topLevelIdent` can be any top level
identifier in this module. If `ModQual` is missing or a local alias of a
qualified import, then `topLevelIdent` must be in scope.
Breakpoints can be set on arbitrarily deeply nested functions, but the
whole chain of nested function names must be specified.
3. To support the new functionality rewrite the code to tab complete `:break`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30e42652ed895c3ed086e7834be46f93ba1cc61b">30e42652</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Respect XELATEX variable
Previously we simply ignored the XELATEX variable when building
PDF documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4acc2934952f4849c2082015d9bebef446d46545">4acc2934</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/make: Detect makeindex
Previously we would simply assume that makeindex was available.
Now we correctly detect it in `configure` and respect this conclusion in
hadrian and make.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d61f866b43d3385be3a8521ba24503c13e8d404">0d61f866</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expunge GhcTcId
GHC.Hs.Extension had
type GhcPs = GhcPass 'Parsed
type GhcRn = GhcPass 'Renamed
type GhcTc = GhcPass 'Typechecked
type GhcTcId = GhcTc
The last of these, GhcTcId, is a vestige of the past.
This patch expunges it from GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ddbed4ad1772ac7dfc96b352a3dc35d958a5f9b">8ddbed4a</a></strong>
<div>
<span>by Adam Wespiser</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add examples to Data.Traversable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/284001d00995c82a1f2b38f696138ad683b5364b">284001d0</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export readBinIface_
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90f438724dbc1ef9e4b371034d44170738fe3224">90f43872</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-06-25T03:54:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export everything from HsToCore.
This lets us reuse these functions in haddock, avoiding synchronization bugs.
Also fixed some divergences with haddock in that file
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7dd6da7e066872a949be7c914cc700182307cd2">c7dd6da7</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part1)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Hs.*
- GHC.Core.*
- GHC.Stg.*
- GHC.Cmm.*
- GHC.Types.*
- GHC.Data.*
- GHC.Builtin.*
- GHC.Parser.*
- GHC.Driver.*
- GHC top
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1eb997a84669f158de9dd16a9e54d279cec22293">1eb997a8</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part2)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Iface.*
- GHC.Llvm.*
- GHC.Rename.*
- GHC.Tc.*
- GHC.HsToCore.*
- GHC.StgToCmm.*
- GHC.CmmToAsm.*
- GHC.Runtime.*
- GHC.Unit.*
- GHC.Utils.*
- GHC.SysTools.*
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67a86b4d4d21954bae7aaddec7617228025a8270">67a86b4d</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add MonadZip and MonadFix instances for Complex
These instances are taken from
https://hackage.haskell.org/package/linear-1.21/docs/Linear-Instances.html
They are the unique possible, so let they be in `base`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c50ef26edaa537c0a13ac1a574632f9078c5671b">c50ef26e</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-25T03:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test suite: add reproducer for #17516
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe281b27d544920a2c2ddc00f6284006b85ab294">fe281b27</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable maxBound checks for OverloadedLists (Fixes #18172)
Consider the Literal `[256] :: [Data.Word.Word8]`
When the `OverloadedLists` extension is not active, then the `ol_ext` field
in the `OverLitTc` record that is passed to the function `getIntegralLit`
contains the type `Word8`. This is a simple type, and we can use its
type constructor immediately for the `warnAboutOverflowedLiterals` function.
When the `OverloadedLists` extension is active, then the `ol_ext` field
contains the type family `Item [Word8]`. The function `nomaliseType` is used
to convert it to the needed type `Word8`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a788d4d17ad332dbfbe08e6822c52ae0de6ef496">a788d4d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Hash: Simplify freeing of HashListChunks
While looking at #18348 I noticed that the treatment of HashLists are a
bit more complex than necessary (which lead to some initial confusion on
my part). Specifically, we allocate HashLists in chunks. Each chunk
allocation makes two allocations: one for the chunk itself and one for a
HashListChunk to link together the chunks for the purposes of freeing.
Simplify this (and hopefully make the relationship between these
clearer) but allocating the HashLists and HashListChunk in a single
malloc. This will both make the implementation easier to follow and
reduce C heap fragmentation.
Note that even after this patch we fail to bound the size of the free
HashList pool. However, this is a separate bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3c2d59bafe253dd7e4966a46564fb16acb1af5c">d3c2d59b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-25T03:54:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: avoid overflow on 32-bit arch (#18375)
We're now correctly computing allocated bytes on 32-bit arch, so we get
huge increases.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3d69dc6c2134afe239caf4f881ba5542d2c2be0">a3d69dc6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-25T23:06:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unify: Make UM actions one-shot by default
This MR makes the UM monad in GHC.Core.Unify into a one-shot
monad. See the long Note [The one-shot state monad trick].
See also #18202 and !3309, which applies this to all Reader/State-like
monads in GHC for compile-time perf improvements. The pattern used
here enables something similar to the state-hack, but is applicable to
user-defined monads, not just `IO`.
Metric Decrease 'runtime/bytes allocated' (test_env='i386-linux-deb9'):
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ee58f8d900884ac8b721b6b95dbfa6500f39431">9ee58f8d</a></strong>
<div>
<span>by Matthias Pall Gissurarson</span>
<i>at 2020-06-26T17:12:45+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement the proposed -XQualifiedDo extension
Co-authored-by: Facundo Domínguez <facundo.dominguez@tweag.io>
QualifiedDo is implemented using the same placeholders for operation names in
the AST that were devised for RebindableSyntax. Whenever the renamer checks
which names to use for do syntax, it first checks if the do block is qualified
(e.g. M.do { stmts }), in which case it searches for qualified names in
the module M.
This allows users to write
{-# LANGUAGE QualifiedDo #-}
import qualified SomeModule as M
f x = M.do -- desugars to:
y <- M.return x -- M.return x M.>>= \y ->
M.return y -- M.return y M.>>
M.return y -- M.return y
See Note [QualifiedDo] and the users' guide for more details.
Issue #18214
Proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-qualified-do.rst
Since we change the constructors `ITdo` and `ITmdo` to carry the new module
name, we need to bump the haddock submodule to account or the new shape of
these constructors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce987865d7594ecbcb3d27435eef773e95b2db85">ce987865</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-27T11:55:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revamp the treatment of auxiliary bindings for derived instances
This started as a simple fix for #18321 that organically grew into a
much more sweeping refactor of how auxiliary bindings for derived
instances are handled. I have rewritten `Note [Auxiliary binders]`
in `GHC.Tc.Deriv.Generate` to explain all of the moving parts, but
the highlights are:
* Previously, the OccName of each auxiliary binding would be given
a suffix containing a hash of its package name, module name, and
parent data type to avoid name clashes. This was needlessly
complicated, so we take the more direct approach of generating
`Exact` `RdrName`s for each auxiliary binding with the same
`OccName`, but using an underlying `System` `Name` with a fresh
`Unique` for each binding. Unlike hashes, allocating new `Unique`s
does not require any cleverness and avoid name clashes all the
same...
* ...speaking of which, in order to convince the renamer that multiple
auxiliary bindings with the same `OccName` (but different
`Unique`s) are kosher, we now use `rnLocalValBindsLHS` instead of
`rnTopBindsLHS` to rename auxiliary bindings. Again, see
`Note [Auxiliary binders]` for the full story.
* I have removed the `DerivHsBind` constructor for
`DerivStuff`—which was only used for `Data.Data`-related
auxiliary bindings—and refactored `gen_Data_binds` to use
`DerivAuxBind` instead. This brings the treatment of
`Data.Data`-related auxiliary bindings in line with every other
form of auxiliary binding.
Fixes #18321.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a403eb917bd26caf96c29d67bfe91163b593b2c9">a403eb91</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum: fix division by zero (#18359)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b3d13b68c95ef9bbeca4437028531d184abcbea">1b3d13b6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ghc-bignum exceptions
We must ensure that exceptions are not simplified. Previously we used:
case raiseDivZero of
_ -> 0## -- dummyValue
But it was wrong because the evaluation of `raiseDivZero` was removed and
the dummy value was directly returned. See new Note [ghc-bignum exceptions].
I've also removed the exception triggering primops which were fragile.
We don't need them to be primops, we can have them exported by ghc-prim.
I've also added a test for #18359 which triggered this patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a74ec37c9d7679a5563ab86a8759c79c3c5de6f0">a74ec37c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-27T11:56:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better loop detection in findTypeShape
Andreas pointed out, in !3466, that my fix for #18304 was not
quite right. This patch fixes it properly, by having just one
RecTcChecker rather than (implicitly) two nested ones, in
findTypeShape.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a04020b88d4935d675f989806aff251f459561e9">a04020b8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:57:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't store buildTag
`DynFlags.buildTag` was a field created from the set of Ways in
`DynFlags.ways`. It had to be kept in sync with `DynFlags.ways` which
was fragile. We want to avoid global state like this (#17957).
Moreover in #14335 we also want to support loading units with different
ways: target units would still use `DynFlags.ways` but plugins would use
`GHC.Driver.Ways.hostFullWays`. To avoid having to deal both with build
tag and with ways, we recompute the buildTag on-the-fly (should be
pretty cheap) and we remove `DynFlags.buildTag` field.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e83efa24636c72811e4c79fe1c7e4f7cf3170cd">0e83efa2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-27T11:57:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't generalize when typechecking a tuple section
The code is simpler and cleaner.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8ba9e6f951a2f8c6e2429a8b2dcb035c392908f">d8ba9e6f</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-06-28T09:19:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: Refactor Haskell-C glue for PPC 64-bit
Make sure the stack is 16 byte aligned even when reserved stack
bytes are not a multiple of 16 bytes.
Avoid saving r2 (TOC). On ELF v1 the function descriptor of StgReturn
has the same TOC as StgRun, on ELF v2 the TOC is recomputed in the
function prologue.
Use the ABI provided functions to save clobbered GPRs and FPRs.
Improve comments. Describe what the stack looks like and how it relates
to the respective ABIs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f797b0ad034a92389e7081aa50ef4ab3434d01">42f797b0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-28T09:19:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use NHsCoreTy to embed types into GND-generated code
`GeneralizedNewtypeDeriving` is in the unique situation where it must
produce an `LHsType GhcPs` from a Core `Type`. Historically, this was
done with the `typeToLHsType` function, which walked over the entire
`Type` and attempted to construct an `LHsType` with the same overall
structure. `typeToLHsType` is quite complicated, however, and has
been the subject of numerous bugs over the years (e.g., #14579).
Luckily, there is an easier way to accomplish the same thing: the
`XHsType` constructor of `HsType`. `XHsType` bundles an `NHsCoreTy`,
which allows embedding a Core `Type` directly into an `HsType`,
avoiding the need to laboriously convert from one to another (as
`typeToLHsType` did). Moreover, renaming and typechecking an
`XHsType` is simple, since one doesn't need to do anything to a
Core `Type`...
...well, almost. For the reasons described in
`Note [Typechecking NHsCoreTys]` in `GHC.Tc.Gen.HsType`, we must
apply a substitution that we build from the local `tcl_env` type
environment. But that's a relatively modest price to pay.
Now that `GeneralizedNewtypeDeriving` uses `NHsCoreTy`, the
`typeToLHsType` function no longer has any uses in GHC, so this patch
rips it out. Some additional tweaks to `hsTypeNeedsParens` were
necessary to make the new `-ddump-deriv` output correctly
parenthesized, but other than that, this patch is quite
straightforward.
This is a mostly internal refactoring, although it is likely that
`GeneralizedNewtypeDeriving`-generated code will now need fewer
language extensions in certain situations than it did before.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68530b1cd45629e5a353a37df80195ac54d26ade">68530b1c</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-28T09:20:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix duplicated words and typos in comments and user guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b79befc246aa9c63dd084012dc7843ea93daaa">15b79bef</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-28T09:20:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add integer-gmp's ghc.mk and GNUmakefile to .gitignore
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfa5698b1ab0190820a2df19487d3d72d3a7924d">bfa5698b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-28T09:21:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in Lint
This simple error in GHC.Core.Litn.lintJoinLams meant that
Lint reported bogus errors.
Fixes #18399
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71006532abb88a53df7c7e0b3a5e2c8af99a48d1">71006532</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-30T07:10:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject nested foralls/contexts in instance types more consistently
GHC is very wishy-washy about rejecting instance declarations with
nested `forall`s or contexts that are surrounded by outermost
parentheses. This can even lead to some strange interactions with
`ScopedTypeVariables`, as demonstrated in #18240. This patch makes
GHC more consistently reject instance types with nested
`forall`s/contexts so as to prevent these strange interactions.
On the implementation side, this patch tweaks `splitLHsInstDeclTy`
and `getLHsInstDeclHead` to not look through parentheses, which can
be semantically significant. I've added a
`Note [No nested foralls or contexts in instance types]` in
`GHC.Hs.Type` to explain why. This also introduces a
`no_nested_foralls_contexts_err` function in `GHC.Rename.HsType` to
catch nested `forall`s/contexts in instance types. This function is
now used in `rnClsInstDecl` (for ordinary instance declarations) and
`rnSrcDerivDecl` (for standalone `deriving` declarations), the latter
of which fixes #18271.
On the documentation side, this adds a new
"Formal syntax for instance declaration types" section to the GHC
User's Guide that presents a BNF-style grammar for what is and isn't
allowed in instance types.
Fixes #18240. Fixes #18271.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bccf3351a28638fba94953c4bb244ecfc3a1a044">bccf3351</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-30T07:10:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ghc-bignum to 8.12 release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81704a6f3b155b0bfbc20f53cd821be3cb9006a7">81704a6f</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-06-30T07:10:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update ssh keys in CI performance metrics upload script
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85310fb83fdb7d7294bd453026102fc42000bf14">85310fb8</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-06-30T07:10:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing Ix instances for tuples of size 6 through 15 (#16643)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cbb6b62f54c77637e29bc66e3d1214541c347753">cbb6b62f</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-01T15:41:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -XLexicalNegation (GHC Proposal #229)
This patch introduces a new extension, -XLexicalNegation, which detects
whether the minus sign stands for negation or subtraction using the
whitespace-based rules described in GHC Proposal #229.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5a0d01d575cdb830918a6a0406f385de2749c2">fb5a0d01</a></strong>
<div>
<span>by Martin Handley</span>
<i>at 2020-07-01T15:42:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">#17169: Clarify Fixed's Enum instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7">b316804d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-01T15:42:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve debug tracing for substitution
This patch improves debug tracing a bit (#18395)
* Remove the ancient SDoc argument to substitution, replacing it
with a HasDebugCallStack constraint. The latter does the same
job (indicate the call site) but much better.
* Add HasDebugCallStack to simpleOptExpr, exprIsConApp_maybe
I needed this to help nail the lookupIdSubst panic in
#18326, #17784
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c9fabb82b39aed9e61c6b78c72312b20a568c68">5c9fabb8</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-01T15:43:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add most common return values for `os` and `arch`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856">76d8cc74</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-01T15:44:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Desugar quoted uses of DerivingVia and expression type signatures properly
The way that `GHC.HsToCore.Quote` desugared quoted `via` types (e.g.,
`deriving via forall a. [a] instance Eq a => Eq (List a)`) and
explicit type annotations in signatures (e.g.,
`f = id @a :: forall a. a -> a`) was completely wrong, as it did not
implement the scoping guidelines laid out in
`Note [Scoped type variables in bindings]`. This is easily fixed.
While I was in town, I did some minor cleanup of related Notes:
* `Note [Scoped type variables in bindings]` and
`Note [Scoped type variables in class and instance declarations]`
say very nearly the same thing. I decided to just consolidate the
two Notes into `Note [Scoped type variables in quotes]`.
* `Note [Don't quantify implicit type variables in quotes]` is
somewhat outdated, as it predates GHC 8.10, where the
`forall`-or-nothing rule requires kind variables to be explicitly
quantified in the presence of an explicit `forall`. As a result,
the running example in that Note doesn't even compile. I have
changed the example to something simpler that illustrates the
same point that the original Note was making.
Fixes #18388.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44d6a3352d708785b75aeb616bfc7efff839184e">44d6a335</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-02T02:54:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T16012: Be verbose on failure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f985333002c1690bf49debcc64fc65ed1d1de244">f9853330</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-02T02:55:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump ghc-prim version to 0.7.0
Fixes #18279. Bumps the `text` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/23e4e04700f840e3c4e75ccb2085aea05bfb5318">23e4e047</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T10:46:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix PowerPC64le support (#17601)
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cdd8d69f5c1d63137b9b56992bb9b74a6785459">3cdd8d69</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T10:47:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: correctly handle addresses with huge offsets (#15570)
Before this patch we could generate addresses of this form:
movzbl cP0_str+-9223372036854775808,%eax
The linker can't handle them because the offset is too large:
ld.lld: error: Main.o:(.text+0xB3): relocation R_X86_64_32S out of range: -9223372036852653050 is not in [-2147483648, 2147483647]
With this patch we detect those cases and generate:
movq $-9223372036854775808,%rax
addq $cP0_str,%rax
movzbl (%rax),%eax
I've also refactored `getAmode` a little bit to make it easier to
understand and to trace.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d90b3ff02002ea25460d087dde56f69a9641096">4d90b3ff</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-07-02T20:07:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">No need for CURSES_INCLUDE_DIRS
This is a leftover from ef63ff27251a20ff11e58c9303677fa31e609a88</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f08d6316d3d19b627550d99b4364e9bf0b45c329">f08d6316</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T20:08:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace Opt_SccProfilingOn flag with sccProfilingEnabled helper function
SCC profiling was enabled in a convoluted way: if WayProf was enabled,
Opt_SccProfilingOn general flag was set (in
`GHC.Driver.Ways.wayGeneralFlags`), and then this flag was queried in
various places.
There is no need to go via general flags, so this patch defines a
`sccProfilingEnabled :: DynFlags -> Bool` helper function that just
checks whether WayProf is enabled.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cc7274b8de254c7266b61fadbc6795dc37bd1e9">8cc7274b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-03T02:49:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ProfHeap: Only allocate the Censuses that we need
When not LDV profiling there is no reason to allocate 32 Censuses; one
will do. This is a very small memory footprint optimisation, but it
comes for free.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b835112cbeaa6e34a8bae7b7697bdf2826edaa9a">b835112c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-03T02:49:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ProfHeap: Free old allocations when reinitialising Censuses
Previously when not LDV profiling we would repeatedly reinitialise
`censuses[0]` with `initEra`. This failed to free the `Arena` and
`HashTable` from the old census, resulting in a memory leak.
Fixes #18348.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34be6523a220b2be972b391d8ad26b75f7c26eb1">34be6523</a></strong>
<div>
<span>by Valery Tolstov</span>
<i>at 2020-07-03T02:50:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention flags that are not enabled by -Wall (#18372)
* Mention missing flags that are not actually enabled by -Wall (docs/users_guide/using-warnings.rst)
* Additionally remove -Wmissing-monadfail-instances from the list of flags enabled by -Wcompat, as it is not the case since 8.8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edc8d22b2eea5d43dd6c3d0e4b2f85fc02ffa5ce">edc8d22b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-03T02:50:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: support R9 and R10 registers
d535ef006d85dbdb7cda2b09c5bc35cb80108909 allowed the use of up to 10
vanilla registers but didn't update LLVM backend to support them. This
patch fixes it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58">4bf18646</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-03T08:37:42+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve handling of data type return kinds
Following a long conversation with Richard, this patch tidies up the
handling of return kinds for data/newtype declarations (vanilla,
family, and instance).
I have substantially edited the Notes in TyCl, so they would
bear careful reading.
Fixes #18300, #18357
In GHC.Tc.Instance.Family.newFamInst we were checking some Lint-like
properties with ASSSERT. Instead Richard and I have added
a proper linter for axioms, and called it from lintGblEnv, which in
turn is called in tcRnModuleTcRnM
New tests (T18300, T18357) cause an ASSERT failure in HEAD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41d2649288a5debcb4c8003e54b7d3072ab951c5">41d26492</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-03T17:33:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: avoid the use of sdocWithDynFlags in GHC.Core.Rules (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7aa6ef110d8cc6626b1cf18d85a37cbac53e2795">7aa6ef11</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-03T17:34:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add the __GHC_FULL_VERSION__ CPP macro to expose the full GHC version
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e61d539527a7398017f759c67621ba18a15878f7">e61d5395</a></strong>
<div>
<span>by Chaitanya Koparkar</span>
<i>at 2020-07-07T13:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim: Turn some comments into haddocks
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37743f91a3f5018a8894ca6d35e8b423e4e08b50">37743f91</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Support `timesInt2#` in LLVM backend
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46397e530e1b107c6b8932f7ca79ebab53a3249a">46397e53</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`genericIntMul2Op`: Call `genericWordMul2Op` directly
This unblocks a refactor, and removes partiality. It might be a PowerPC
regression but that should be fixable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a1c0584da40d0f8d1ffd01796efcce3b3d0820d">8a1c0584</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify `PrimopCmmEmit`
Follow @simonpj's suggestion of pushing the "into regs" logic into
`emitPrimOp`. With the previous commit getting rid of the recursion in
`genericIntMul2Op`, this is now an easy refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6607f203fb9ad11af1463145810e1bd3c6c4f2c8">6607f203</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`opAllDone` -> `opIntoRegs`
The old name was and terrible and became worse after the previous
commit's refactor moved non-trivial funcationlity into its body.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdcc53babbd6c878344d2a3395bbd619428bd2dd">fdcc53ba</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimise genericIntMul2Op
We shouldn't directly call 'genericWordMul2Op' in genericIntMul2Op
because a target may provide a faster primop for 'WordMul2Op': we'd
better use it!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/686e72253aed3880268dd6858eadd8c320f09e97">686e7225</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker/rtsSymbols] More linker symbols
Mostly symbols needed for aarch64/armv7l
and in combination with musl, where we have
to rely on loading *all* objects/archives
- __stack_chk_* only when not DYNAMIC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f60b94de1f460ca3f689152860b108a19ce193e">3f60b94d</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">better if guards.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7abffced01f5680efafe44f6be2733eab321b039">7abffced</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix (1)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdfeb3f24f76e8fd30452016676e56fbc827789a">cdfeb3f2</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">AArch32 symbols only on aarch32.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f496c9550098ffaa3bf25a3447c138626d79bae0">f496c955</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add -flink-rts flag to link the rts when linking a shared or static library #18072
By default we don't link the RTS when linking shared libraries because in the
most usual mode a shared library is an intermediary product, for example a
Haskell library, that will be linked into some executable in the end. So we
wish to defer the RTS flavour to link to the final link.
However sometimes the final product is the shared library, for example when
writing a plugin for some other system, so we do wish the shared library to
link the RTS.
For consistency we also make -staticlib honor this flag and its inversion.
-staticlib currently implies -flink-shared.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c59faf67fec83c98ffd1b65f1be0775b34f36595">c59faf67</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-07T13:56:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: link check-ppr against debugging RTS if ghcDebugged
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0effc57d48ace6b719a9f4cbeac67c95ad55010b">0effc57d</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts linker: teach the linker about GLIBC's special handling of *stat, mknod and atexit functions #7072
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9615343363a68313c4bfdb068696002ecca7786e">96153433</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: make hadrian/ghci use the bootstrap compiler from configure #18190
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d24f886a428e95eb5e962294c77b12bffa40a52">4d24f886</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: ignore cabal configure verbosity related flags #18131
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7332bbffee9e2a712508540200eb52ed3d227426">7332bbff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-07T13:56:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen T12234 acceptance window to 2%
Previously it wasn't uncommon to see +/-1% fluctuations in compiler
allocations on this test.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/180b63136f25d9fedb764cb9bc23637e7781ed4e">180b6313</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-07-07T13:56:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">When running libtool, report it as such</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3bd68978476487591fc60f7feb7cfb36b8fc3a3">d3bd6897</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">BigNum: rename BigNat types
Before this patch BigNat names were confusing because we had:
* GHC.Num.BigNat.BigNat: unlifted type used everywhere else
* GHC.Num.BigNat.BigNatW: lifted type only used to share static constants
* GHC.Natural.BigNat: lifted type only used for backward compatibility
After this patch we have:
* GHC.Num.BigNat.BigNat#: unlifted type
* GHC.Num.BigNat.BigNat: lifted type (reexported from GHC.Natural)
Thanks to @RyanGlScott for spotting this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/929d26db3080ec49ab67690952a316fc082b479f">929d26db</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: don't build ghc-bignum with stage0
Noticed by @Ericson2314
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d25b6851bbd63b6a65fb7cd08b37c6bc74df9855">d25b6851</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: ghc-gmp.h shouldn't be a compiler dependency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ddae2ba979ac2e01d7d9f6b79a9559fbfde46ea">0ddae2ba</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: factor out pprUnitId from "Outputable UnitId" instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/204f3f5ddec56403bfb12e74291b3b1d14824138">204f3f5d</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-07T13:56:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused function pprHsForAllExtra (#18423)
The function `pprHsForAllExtra` was called only on `Nothing`
since 2015 (1e041b7382b6aa).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3033e0e4940e6ecc43f478f1dcfbd0c3cb1e3ef8">3033e0e4</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-08T20:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: add flag to skip rebuilding dependency information #17636
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7de4b960a1024adcd0bded6bd320a90979d7ab8">b7de4b96</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-09T09:49:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHCi :print on big-endian platforms
On big-endian platforms executing
import GHC.Exts
data Foo = Foo Float# deriving Show
foo = Foo 42.0#
foo
:print foo
results in an arithmetic overflow exception which is caused by function
index where moveBytes equals
word_size - (r + item_size_b) * 8
Here we have a mixture of units. Both, word_size and item_size_b have
unit bytes whereas r has unit bits. On 64-bit platforms moveBytes
equals then
8 - (0 + 4) * 8
which results in a negative and therefore invalid second parameter for a
shiftL operation.
In order to make things more clear the expression
(word .&. (mask `shiftL` moveBytes)) `shiftR` moveBytes
is equivalent to
(word `shiftR` moveBytes) .&. mask
On big-endian platforms the shift must be a left shift instead of a
right shift. For symmetry reasons not a mask is used but two shifts in
order to zero out bits. Thus the fixed version equals
case endian of
BigEndian -> (word `shiftL` moveBits) `shiftR` zeroOutBits `shiftL` zeroOutBits
LittleEndian -> (word `shiftR` moveBits) `shiftL` zeroOutBits `shiftR` zeroOutBits
Fixes #16548 and #14455
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3656dff8259199d0dab2d1a1f1b887c252a9c1a3">3656dff8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-09T09:50:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: fix MO_S_Mul2 support (#18434)
The value indicating if the carry is useful wasn't taken into account.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d9f095060b0f00d7140f8b0858b7a5dcbffea9ef">d9f09506</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-10T10:33:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define multiShotIO and use it in mkSplitUniqueSupply
This patch is part of the ongoing eta-expansion saga;
see #18238.
It implements a neat trick (suggested by Sebastian Graf)
that allows the programmer to disable the default one-shot behaviour
of IO (the "state hack"). The trick is to use a new multiShotIO
function; see Note [multiShotIO]. For now, multiShotIO is defined
here in Unique.Supply; but it should ultimately be moved to the IO
library.
The change is necessary to get good code for GHC's unique supply;
see Note [Optimising the unique supply].
However it makes no difference to GHC as-is. Rather, it makes
a difference when a subsequent commit
Improve eta-expansion using ArityType
lands.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bce695cc97cadbc3eced5b53efaaa0ecfd201d61">bce695cc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-10T10:33:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make arityType deal with join points
As Note [Eta-expansion and join points] describes,
this patch makes arityType deal correctly with join points.
What was there before was not wrong, but yielded lower
arities than it could.
Fixes #18328
In base GHC this makes no difference to nofib.
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
n-body -0.1% -0.1% -1.2% -1.1% 0.0%
--------------------------------------------------------------------------------
Min -0.1% -0.1% -55.0% -56.5% 0.0%
Max -0.0% 0.0% +16.1% +13.4% 0.0%
Geometric Mean -0.0% -0.0% -30.1% -31.0% -0.0%
But it starts to make real difference when we land the change to the
way mkDupableAlts handles StrictArg, in fixing #13253 and friends.
I think this is because we then get more non-inlined join points.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b7c71cb79095a10b9a5964a5a0676a2a196e92d">2b7c71cb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-11T12:17:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve eta-expansion using ArityType
As #18355 shows, we were failing to preserve one-shot info when
eta-expanding. It's rather easy to fix, by using ArityType more,
rather than just Arity.
This patch is important to suport the one-shot monad trick;
see #18202. But the extra tracking of one-shot-ness requires
the patch
Define multiShotIO and use it in mkSplitUniqueSupply
If that patch is missing, ths patch makes things worse in
GHC.Types.Uniq.Supply. With it, however, we see these improvements
T3064 compiler bytes allocated -2.2%
T3294 compiler bytes allocated -1.3%
T12707 compiler bytes allocated -1.3%
T13056 compiler bytes allocated -2.2%
Metric Decrease:
T3064
T3294
T12707
T13056
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de139cc496c0e0110e252a1208ae346f47f8061e">de139cc4</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-07-12T02:53:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add reproducer for #15630
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4de6a7a5c6433ae8c4df8a9fa09fbd9f3bbd0bf">c4de6a7a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-12T02:53:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Give Uniq[D]FM a phantom type for its key.
This fixes #17667 and should help to avoid such issues going forward.
The changes are mostly mechanical in nature. With two notable
exceptions.
* The register allocator.
The register allocator references registers by distinct uniques.
However they come from the types of VirtualReg, Reg or Unique in
various places. As a result we sometimes cast the key type of the
map and use functions which operate on the now typed map but take
a raw Unique as actual key. The logic itself has not changed it
just becomes obvious where we do so now.
* <Type>Env Modules.
As an example a ClassEnv is currently queried using the types `Class`,
`Name`, and `TyCon`. This is safe since for a distinct class value all
these expressions give the same unique.
getUnique cls
getUnique (classTyCon cls)
getUnique (className cls)
getUnique (tcName $ classTyCon cls)
This is for the most part contained within the modules defining the
interface. However it requires us to play dirty when we are given a
`Name` to lookup in a `UniqFM Class a` map. But again the logic did
not change and it's for the most part hidden behind the Env Module.
Some of these cases could be avoided by refactoring but this is left
for future work.
We also bump the haddock submodule as it uses UniqFM.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8">c2cfdfde</a></strong>
<div>
<span>by Aaron Allen</span>
<i>at 2020-07-13T09:00:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn about empty Char enumerations (#18402)
Currently the "Enumeration is empty" warning (-Wempty-enumerations)
only fires for numeric literals. This patch adds support for `Char`
literals so that enumerating an empty list of `Char`s will also
trigger the warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3ac87ece2716b83ad886e81c20f4161e8ec0efd">c3ac87ec</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-13T09:01:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build check-ppr dynamic if GHC is build dynamic
Fixes #18361
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ad072b487fe528947f817b0417933a6cd1941b7">9ad072b4</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use dumpStyle when printing inlinings
This just makes debug-printing consistent,
and more informative.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e78c4efb8735eb97f17e7b4ca35e305b0766f78a">e78c4efb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ccb760b1a8034b28171d7540712fd195f65d1fd">7ccb760b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reduce result discount in conSize
Ticket #18282 showed that the result discount given by conSize
was massively too large. This patch reduces that discount to
a constant 10, which just balances the cost of the constructor
application itself.
Note [Constructor size and result discount] elaborates, as
does the ticket #18282.
Reducing result discount reduces inlining, which affects perf. I
found that I could increase the unfoldingUseThrehold from 80 to 90 in
compensation; in combination with the result discount change I get
these overall nofib numbers:
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
boyer -0.2% +5.4% -3.2% -3.4% 0.0%
cichelli -0.1% +5.9% -11.2% -11.7% 0.0%
compress2 -0.2% +9.6% -6.0% -6.8% 0.0%
cryptarithm2 -0.1% -3.9% -6.0% -5.7% 0.0%
gamteb -0.2% +2.6% -13.8% -14.4% 0.0%
genfft -0.1% -1.6% -29.5% -29.9% 0.0%
gg -0.0% -2.2% -17.2% -17.8% -20.0%
life -0.1% -2.2% -62.3% -63.4% 0.0%
mate +0.0% +1.4% -5.1% -5.1% -14.3%
parser -0.2% -2.1% +7.4% +6.7% 0.0%
primetest -0.2% -12.8% -14.3% -14.2% 0.0%
puzzle -0.2% +2.1% -10.0% -10.4% 0.0%
rsa -0.2% -11.7% -3.7% -3.8% 0.0%
simple -0.2% +2.8% -36.7% -38.3% -2.2%
wheel-sieve2 -0.1% -19.2% -48.8% -49.2% -42.9%
--------------------------------------------------------------------------------
Min -0.4% -19.2% -62.3% -63.4% -42.9%
Max +0.3% +9.6% +7.4% +11.0% +16.7%
Geometric Mean -0.1% -0.3% -17.6% -18.0% -0.7%
I'm ok with these numbers, remembering that this change removes
an *exponential* increase in code size in some in-the-wild cases.
I investigated compress2. The difference is entirely caused by this
function no longer inlining
WriteRoutines.$woutputCodes
= \ (w :: [CodeEvent]) ->
let result_s1Sr
= case WriteRoutines.outputCodes_$s$woutput w 0# 0# 8# 9# of
(# ww1, ww2 #) -> (ww1, ww2)
in (# case result_s1Sr of (x, _) ->
map @Int @Char WriteRoutines.outputCodes1 x
, case result_s1Sr of { (_, y) -> y } #)
It was right on the cusp before, driven by the excessive result
discount. Too bad!
Happily, the compiler/perf tests show a number of improvements:
T12227 compiler bytes-alloc -6.6%
T12545 compiler bytes-alloc -4.7%
T13056 compiler bytes-alloc -3.3%
T15263 runtime bytes-alloc -13.1%
T17499 runtime bytes-alloc -14.3%
T3294 compiler bytes-alloc -1.1%
T5030 compiler bytes-alloc -11.7%
T9872a compiler bytes-alloc -2.0%
T9872b compiler bytes-alloc -1.2%
T9872c compiler bytes-alloc -1.5%
Metric Decrease:
T12227
T12545
T13056
T15263
T17499
T3294
T5030
T9872a
T9872b
T9872c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f0b671ee8a65913891c07f157b21d77d6c63036">7f0b671e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen acceptance threshold on T5837
This test is positively tiny and consequently the bytes allocated
measurement will be relatively noisy. Consequently I have seen this
fail spuriously quite often.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/118e1c3da622f17c67b4e0fbc12ed7c7084055dc">118e1c3d</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-07-14T21:30:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: re-engineer the treatment of rebindable if
Executing on the plan described in #17582, this patch changes the way if expressions
are handled in the compiler in the presence of rebindable syntax. We get rid of the
SyntaxExpr field of HsIf and instead, when rebindable syntax is on, we rewrite the HsIf
node to the appropriate sequence of applications of the local `ifThenElse` function.
In order to be able to report good error messages, with expressions as they were
written by the user (and not as desugared by the renamer), we make use of TTG
extensions to extend GhcRn expression ASTs with an `HsExpansion` construct, which
keeps track of a source (GhcPs) expression and the desugared (GhcRn) expression that
it gives rise to. This way, we can typecheck the latter while reporting the former in
error messages.
In order to discard the error context lines that arise from typechecking the desugared
expressions (because they talk about expressions that the user has not written), we
carefully give a special treatment to the nodes fabricated by this new renaming-time
transformation when typechecking them. See Note [Rebindable syntax and HsExpansion]
for more details. The note also includes a recipe to apply the same treatment to
other rebindable constructs.
Tests 'rebindable11' and 'rebindable12' have been added to make sure we report
identical error messages as before this patch under various circumstances.
We also now disable rebindable syntax when processing untyped TH quotes, as per
the discussion in #18102 and document the interaction of rebindable syntax and
Template Haskell, both in Note [Template Haskell quotes and Rebindable Syntax]
and in the user guide, adding a test to make sure that we do not regress in
that regard.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64c774b043a2d9be3b98e445990c795f070dab3f">64c774b0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-14T21:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explain why keeping DynFlags in AnalEnv saves allocation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/254245d01e3c1d4f9072abc4372fd3fb0a6ece9f">254245d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-14T21:32:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/users-guide: Update default -funfolding-use-threshold value
This was changed in 3d2991f8 but I neglected to update the
documentation. Fixes #18419.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c259f86938f4016f4bd4fde7a300fa83591036f">4c259f86</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-14T21:32:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Escape backslashes in json profiling reports properly.
I also took the liberty to do away the fixed buffer size for escaping.
Using a fixed size here can only lead to issues down the line.
Fixes #18438.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2379722438cb551210c4899119ade05989c17166">23797224</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-14T21:33:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitlab: re-enable integer-simple substitute (BIGNUM_BACKEND)
Recently build system migrated from INTEGER_LIBRARY to BIGNUM_BACKEND.
But gitlab CI was never updated. Let's enable BIGNUM_BACKEND=native.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0db878a789e58c2a1aba2e73d42857008174124">e0db878a</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-14T21:33:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum: bring in sync .hs-boot files with module declarations
Before this change `BIGNUM_BACKEND=native` build was failing as:
```
libraries/ghc-bignum/src/GHC/Num/BigNat/Native.hs:708:16: error:
* Variable not in scope: naturalFromBigNat# :: WordArray# -> t
* Perhaps you meant one of these:
`naturalFromBigNat' (imported from GHC.Num.Natural),
`naturalToBigNat' (imported from GHC.Num.Natural)
|
708 | m' = naturalFromBigNat# m
|
```
This happens because `.hs-boot` files are slightly out of date.
This change brings in data and function types in sync.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9f65c369a60467dcaf2b37d5f41f00565b4fe25">c9f65c36</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-14T21:33:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Disassembler.c: Use FMT_HexWord for printing values in hex format
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ae62ebb5750e4dfbdb171efde8e3064b7afea8">58ae62eb</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-14T21:34:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">macOS: Load frameworks without stating them first.
macOS Big Sur makes the following change to how frameworks are shipped
with the OS:
> New in macOS Big Sur 11 beta, the system ships with a built-in
> dynamic linker cache of all system-provided libraries. As part of
> this change, copies of dynamic libraries are no longer present on
> the filesystem. Code that attempts to check for dynamic library
> presence by looking for a file at a path or enumerating a directory
> will fail. Instead, check for library presence by attempting to
> dlopen() the path, which will correctly check for the library in the
> cache. (62986286)
https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes/
Therefore, the previous method of checking whether a library exists
before attempting to load it makes GHC.Runtime.Linker.loadFramework
fail to find frameworks installed at /System/Library/Frameworks.
GHC.Runtime.Linker.loadFramework now opportunistically loads the
framework libraries without checking for their existence first,
failing only if all attempts to load a given framework from any of the
various possible locations fail.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdc4a6b0f71bbd16a11f23e455b28c0c15720b38">cdc4a6b0</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-14T21:34:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">loadFramework: Output the errors collected in all loading attempts.
With the recent change away from first finding and then loading a
framework, loadFramework had no way of communicating the real reason
why loadDLL failed if it was any reason other than the framework
missing from the file system. It now collects all loading attempt
errors into a list and concatenates them into a string to return to
the caller.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51dbfa52df483822b99bb191d2ffc0943954e1d3">51dbfa52</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T04:05:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">StgToCmm: Use CmmRegOff smart constructor
Previously we would generate expressions of the form
`CmmRegOff BaseReg 0`. This should do no harm (and really should be
handled by the NCG anyways) but it's better to just generate a plain
`CmmReg`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae11bdfd98a10266bfc7de9e16b500be220307ac">ae11bdfd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T04:06:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add regression test for #17744
Test due to @monoidal.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e3c277a6c82c5ab529771c1c493d86e7eda0a98">0e3c277a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
Updates a variety of tests as Cabal is now more strict about Cabal file
form.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ceed994acd07259ef3a780ab440185dbb26fff09">ceed994a</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Drop Windows Vista support, require Windows 7
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00a23bfda4840546075ec2b2e18f61380b360dfc">00a23bfd</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update Windows FileSystem wrapper utilities.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459e1c5f7c71e37ed8bb239c57bdec441d278fff">459e1c5f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Use SlimReaderLocks and ConditonalVariables provided by the OS instead of emulated ones
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/763088fc3c14c8687685fe811eac13d216971840">763088fc</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Small linker comment and ifdef cleanups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a228ff9e04c91bc9b6f62942dc18bf1985a58a4">1a228ff9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Flush event logs eagerly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9e04ddae1bf89902803d86282f41a586620c58f">e9e04dda</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Refactor Buffer structures to be able to track async operations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/356dc3feae967b1c361130f1f356ef9ad6a693e4">356dc3fe</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Implement new Console API
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90e69f779b6da755fac472337535a1321cbb7917">90e69f77</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add IOPort synchronization primitive
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71245fcce24723910f12f934fbc4c700658b727a">71245fcc</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add new io-manager cmdline options
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d548a3b3058232cbfd588f6a2c2b9108bbe8d190">d548a3b3</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Init Windows console Codepage to UTF-8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ef63668ec395aa7a2b250d9930641305d646e2">58ef6366</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add unsafeSplat to GHC.Event.Array
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d660725edbdaeef9be5da4c032e687276dd09b13">d660725e</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add size and iterate to GHC.Event.IntTable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/050da6dd42d0cb293c7fce4a5ccdeb5abe1aadb4">050da6dd</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Switch Testsuite to test winio by default
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf542bf1cdf2fa468457fc0af21333478293476">4bf542bf</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Multiple refactorings and support changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4489af6bad11a198e9e6c192f41e17020f28d0c1">4489af6b</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: core threaded I/O manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64d8f2fe2d27743e2986d2176b1aa934e5484d7a">64d8f2fe</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: core non-threaded I/O manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8da15a09955926c4617d3468b84b3f3ca414d48a">8da15a09</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix a scheduler bug with the threaded-runtime.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84ea3d1492127442e2d416f1f576a5921186ada4">84ea3d14</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Relaxing some constraints in io-manager.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccf0d1073969e3b73fed82cd421d74800f552953">ccf0d107</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix issues with non-threaded I/O manager after split.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b492fe6e4bde56341abbdb55d19fdf6e02ff70e9">b492fe6e</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove some barf statements that are a bit strict.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01423fd205809e884fd9b7b69286108ca06a0d98">01423fd2</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand comments describing non-threaded loop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b69004f3c9518f59a8f0b6f7f77aa92bea85adf">4b69004f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix FileSize unstat-able handles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b38427045b8f1621f607fa7ab9c6353aa479ac5">9b384270</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Implement new tempfile routines for winio
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1e0be824523c6687e3d8588c46a57b2cd22ecc1">f1e0be82</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix input truncation when reading from handle.
This was caused by not upholding the read buffer invariant
that bufR == bufL == 0 for empty read buffers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e176b625689563d2ccfbfec46e664d17824f1968">e176b625</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix output truncation for writes larger than buffer size
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a831ce0e7f0bbd8d81e96074e981fe1972fde6dd">a831ce0e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rewrite bufWrite.
I think it's far easier to follow the code now.
It's also correct now as I had still missed a spot
where we didn't update the offset.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6aefdf62b767b7828698c3ec5bf6a15e6e20eddb">6aefdf62</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix offset set by bufReadEmpty.
bufReadEmpty returns the bytes read *including* content that
was already buffered,
But for calculating the offset we only care about the number
of bytes read into the new buffer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/750ebaeec06d7ee118abfbb29142c12fb31730cc">750ebaee</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Clean up code surrounding IOPort primitives.
According to phyx these should only be read and written once per
object. Not neccesarily in that order.
To strengthen that guarantee the primitives will now throw an
exception if we violate this invariant.
As a consequence we can eliminate some code from their primops.
In particular code dealing with multiple queued readers/writers
now simply checks the invariant and throws an exception if it
was violated. That is in contrast to mvars which will do things
like wake up all readers, queue multi writers etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffd31db99f6fb8958900147035ddac9a47b7a764">ffd31db9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix multi threaded threadDelay and a few other small changes.
Multithreaded threadDelay suffered from a race condition
based on the ioManagerStatus. Since the status isn't needed
for WIO I removed it completely.
This resulted in a light refactoring, as consequence we will always
wake up the IO manager using interruptSystemManager, which uses
`postQueuedCompletionStatus` internally.
I also added a few comments which hopefully makes the code easier to
dive into for the next person diving in.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ec26df241d80e8e5cf39a02757c274067c8078d">6ec26df2</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wionio: Make IO subsystem check a no-op on non-windows platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29bcd9363f2712524f7720377f19cb885adf2825">29bcd936</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Set handle offset when opening files in Append mode.
Otherwise we would truncate the file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55c29700fba3f35a80acd366b2f05b66464d8258">55c29700</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove debug event log trace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9acb9f40d90b79da9e587022d73f8afb26a46463">9acb9f40</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix sqrt and openFile009 test cases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57017cb7454cbfaa1b011693e7fb141fbf519ccf">57017cb7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Allow hp2ps to build with -DDEBUG
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8cd99951c8e21f82c3a95940de10128b78ab4ab">b8cd9995</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update output of T9681 since we now actually run it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10af5b1418554860e377b0df79026c2ea3669ab4">10af5b14</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: A few more improvements to the IOPort primitives.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39afc4a785a37f238a9004b2f6882d1951953c07">39afc4a7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix expected tempfiles output.
Tempfiles now works properly on windows, as such we can
delete the win32 specific output.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99db46e09c50681e35de75d8bfec6cfb9ac3f9fc">99db46e0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Assign thread labels to IOManager threads.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be6af7324bcd918c61172f6814b8a70a6cfdd58e">be6af732</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Properly check for the tso of an incall to be zero.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2c6dac783d6cb15217a3be196abeba6c6105588">e2c6dac7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Mark FD instances as unsupported under WINIO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd02ceed5661e1c2fa85ec5c663697a3b0cf3e04">fd02ceed</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix threadDelay maxBound invocations.
Instead of letting the ns timer overflow now clamp it at
(maxBound :: Word64) ns. That still gives a few hundred
years.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc79f9f180b3fc73fe25439faf9cc5f19622acb3">bc79f9f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add comments/cleanup an import in base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d197f4bbe5bf6d7189c329a742917db3f67ad34">1d197f4b</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Mark outstanding_service_requests volatile.
As far as I know C(99) gives no guarantees for code like
bool condition;
...
while(condition)
sleep();
that condition will be updated if it's changed by another thread.
So we are explicit here and mark it as volatile, this will force
a reload from memory on each iteration.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc4381869748ec25ac9560bf7e89641b560b6862">dc438186</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Make last_event a local variable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2fc957c52270d93073b7ed9fe42ac51fcd749a45">2fc957c5</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add comment about thread safety of processCompletion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c026b6cf5eb25651f656833e4d312621866330d">4c026b6c</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: nonthreaded: Create io processing threads in main thread.
We now set a flag in the IO thread. The scheduler when looking for work
will check the flag and create/queue threads accordingly.
We used to create these in the IO thread. This improved performance
but caused frequent segfaults. Thread creation/allocation is only safe to
do if nothing currently accesses the storeagemanager. However without
locks in the non-threaded runtime this can't be guaranteed.
This shouldn't change performance all too much.
In the past we had:
* IO: Create/Queue thread.
* Scheduler: Runs a few times. Eventually picks up IO processing thread.
Now it's:
* IO: Set flag to queue thread.
* Scheduler: Pick up flag, if set create/queue thread. Eventually picks up IO processing thread.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f47c7208c31bdd695ba46e6bdf4a349ae46c79bc">f47c7208</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add an exported isHeapAlloced function to the RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc5d7bb1dcf5603ac47320e83e4fc9ef53e409e9">cc5d7bb1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Queue IO processing threads at the front of the queue.
This will unblock the IO thread sooner hopefully leading to higher
throughput in some situations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e763011596ccafccdd476e1cac0ee6088d439e3b">e7630115</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: ThreadDelay001: Use higher resolution timer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/451b5f96c8a3366584a62034747c8b78fc3b0486">451b5f96</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update T9681 output, disable T4808 on windows.
T4808 tests functionality of the FD interface which won't be supported
under WINIO.
T9681 just has it's expected output tweaked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd06f930a3228ef7ae8ea5c7225552d6df21f662">dd06f930</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Wake io manager once per registerTimeout.
Which is implicitly done in editTimeouts, so need to wake it
up twice.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e87d0bf9a430bf52a0068b9b53dcc4592c8da930">e87d0bf9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update placeholder comment with actual function name.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc9025db55345d6b427489b942878d781f70a039">fc9025db</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Always lock win32 event queue
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c24c9a1f2a10e044a31b7d89586f4a19ff61e137">c24c9a1f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Display thread labels when tracing scheduler events.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06542b033116bfc4b47c80bdeab44ed1d99005bb">06542b03</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Refactor non-threaded runner thread and scheduler interface.
Only use a single communication point (registerAlertableWait) to inform
the C side aobut both timeouts to use as well as outstanding requests.
Also queue a haskell processing thread after each return from alertable
waits. This way there is no risk of us missing a timer event.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/256299b13e17044d6904a85043130d13bc592a62">256299b1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove outstanding_requests from runner.
We used a variable to keep track of situations where we got
entries from the IO port, but all of them had already been
canceled. While we can avoid some work that way this case
seems quite rare.
So we give up on tracking this and instead always assume at
least one of the returned entries is valid.
If that's not the case no harm is done, we just perform some
additional work. But it makes the runner easier to reason about.
In particular we don't need to care if another thread modifies
oustanding_requests after we return from waiting on the IO Port.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ebd8ad9b1f7f77a928f2ff0d3e61ddfae068dd3">3ebd8ad9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Various fixes related to rebase and testdriver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6be6bcbac0e39537f3a40c615d1568a3d6391f9b">6be6bcba</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix rebase artifacts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c649dc3ba7b08817352eb24d9888651290b6eb6">2c649dc3</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename unsafeSplat to unsafeCopyFromBuffer
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a18b73f34dc3d177e76259bd65326a94824d97e0">a18b73f3</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove unused size/iterate operations from IntTable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/16bab48ef69866725d2ab20ca7bd1da5f5a70000">16bab48e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Detect running IO Backend via peeking at RtsConfig
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b8405a0dd45c16ec305884cadda992327733621">8b8405a0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update temp path so GCC etc can handle it.
Also fix PIPE support, clean up error casting, fix memory leaks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2092bc542516461eeb06d855dfbe9b04438767bc">2092bc54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Minor comments/renamings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5b5b6c0de4e9ea2923beeff488e852aa247000a">a5b5b6c0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Checking if an error code indicates completion is now a function.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/362176fd9189e73083fd2a2012c9b5be1e3fd05b">362176fd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Small refactor in withOverlappedEx
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32e20597b2fe5864b578c732501fe20d899e8f9c">32e20597</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: A few comments and commented out dbxIO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4bfc1d9ae59adc58a0df3b25f85873533481e94">a4bfc1d9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Don't drop buffer offset in byteView/cwcharView
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3ad2a54bf775e1ca110b501894891d4ccff3d8f">b3ad2a54</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: revert BHandle changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dcd87e2fd6d03028d18bf1a61e526142ee9b8a1">3dcd87e2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix imports
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a3718909e8eb214d4a70082b7fee8d6f3efc975">5a371890</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update ghc-cabal to handle new Cabal submodule bump
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d07ebe0df6df32bbffbf77ea09e39b6da2e8cbb3">d07ebe0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Only compile sources on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcb423937a052496af73e34a315e3d15882b9f19">dcb42393</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Actually return Nothing on EOF for non-blocking read
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/895a3beb26de69f5611ea496dddb2b121c1dd5c1">895a3beb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Deduplicate logic in encodeMultiByte[Raw]IO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e06e6734a4d5c49c625605a2675c47fd93f834b2">e06e6734</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Deduplicate openFile logic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b59430c00f41e18386bc44540180451169f6b9d7">b59430c0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix -werror issue in encoding file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8d39a510c563271e26ec7175b8e538d0b6809da">f8d39a51</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Don't mention windows specific functions when building on Linux.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a533d2afaab8b8ca0026c9af1a8ed9ff09c4462">6a533d2a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: add a note about file locking in the RTS.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf37ce3499a0367faf7fcaf014d8350e5864fe7a">cf37ce34</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add version to @since annotation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fafa2eb45d9283526c79f810476a369af21bf3b">0fafa2eb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename GHC.Conc.IOCP -> GHC.Conc.WinIO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1854fc23489baa39cb37f8d49ff74b7ee78d7de1">1854fc23</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand GHC.Conc.POSIX description
It now explains users may not use these functions when
using the old IO manager.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fcc7ba414e1dfab70136a824775421b26ce1b81a">fcc7ba41</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix potential spaceleak in __createUUIDTempFileErrNo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b3fd9fa15e75f646ac6eaa384f54afe853029f4">6b3fd9fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove redundant -Wno-missing-signatures pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/916fc861520615149c66c1069f6cb661bc8b8483">916fc861</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Make it explicit that we only create one IO manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f260a7218f71398ad2dbca0f47feaf31c21081b3">f260a721</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Note why we don't use blocking waits.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa0a4bbfbae0244313fa99862b97f71c15f9bd81">aa0a4bbf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove commented out pragma
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d679b544e14ad912fddc97b1b735d3c2838a2c4b">d679b544</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove redundant buffer write in Handle/Text.hs:bufReadEmpty
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3f94368cc27e124c07f9c3f90e3f9563a7fc55d">d3f94368</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename SmartHandles to StdHandles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd6b8ec1e775441fc943702e93d48ce75f155e9e">bd6b8ec1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: add comment stating failure behaviour for getUniqueFileInfo.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12846b85a94b2b73f456e4c441c7890d685deb67">12846b85</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update IOPort haddocks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f39fb14997f1aa3768c89bb8e83c6addc705d92">9f39fb14</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add a note cross reference
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62dd5a7309f273b5bb7d6ab44a1d2745010c13a0">62dd5a73</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Name Haskell/OS I/O Manager explicitly in Note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa80782864895fe614e1b83416736014e68c8b35">fa807828</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand BlockedOnIOCompletion description.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0880a1daea4f3c9fa6fa4624914081f29736ea2">f0880a1d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove historical todos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e58e714e9a4b5fe77c4e71802cc4b9ad1998af3">8e58e714</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update note, remove debugging pragma.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa4d84d556b39715ebc1a7860a620ec5a7d9beeb">aa4d84d5</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: flushCharReadBuffer shouldn't need to adjust offsets.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e580893ab8b76ff4b6582b1fb2ed55cc9742d5a2">e580893a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove obsolete comment about cond. variables
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d54e9d7911901ee5bfcba43b2e4e1a4df11c670e">d54e9d79</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix initial linux validate build
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cd4de46c1f31e2f044c671a4474126fc0d5a8da">3cd4de46</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix ThreadDelay001 CPP
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c88b1b9fde4eedcd1b62c51b1a53201ec3cf29c8">c88b1b9f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix openFile009 merge conflict leftover
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/849e8889fe9586bf9e1bf37885537f25743383f2">849e8889</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept T9681 output.
GHC now reports String instead of [Char].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7701818e75b66957724f48c4aafac146699b667">e7701818</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix cabal006 after upgrading cabal submodule
Demand cabal 2.0 syntax instead of >= 1.20 as required by newer cabal versions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a44f037372feac67793deb919d988468809ce470">a44f0373</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix stderr output for ghci/linking/dyn tests.
We used to filter rtsopts, i opted to instead just accept the warning of it having no effect.
This works both for -rtsopts, as well as -with-rtsopts which winio adds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/515d98960d3cdcdd7d78a9f28d1b0ad39865c67f">515d9896</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Adjust T15261b stdout for --io-manager flag.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/949aaaccf34ef7e28a745081775b01627590fc46">949aaacc</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Adjust T5435_dyn_asm stderr
The warning about rtsopts having no consequences is expected.
So accept new stderr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d424e1e31a8f16e614947460e0e4e4b52f8b5cf">7d424e1e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Also accept T7037 stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f0097683f65ee3cd917af843621ed73b5348e68">1f009768</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix cabal04 by filtering rts args
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/981a9f2e57728cdf39de9fc173b11be4084997d3">981a9f2e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix cabal01 by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7b0464eb7a5510fde4a804402491ecad2f1092b">b7b0464e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix safePkg01 by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32734b29cbe0450d27fa6b4ea67b05aff2c4919d">32734b29</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix T5435_dyn_gcc by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acc5cebf42e38c2b0869117329811c03c4e3f545">acc5cebf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix tempfiles test on linux
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c577b789e8f76f81a99f1731700c27796effb598">c577b789</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for T3807
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c108c52779a6423871ea372be82b94f5274e57da">c108c527</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for linker_unload
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b0b9a08a3412114f568fb26e3d684ccb7092f88">2b0b9a08</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for linker_unload_multiple_objs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67afb03c45cf8a8dc9e51413cf187f36768a5a0b">67afb03c</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: clarify wording on conditional variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bd415721672da9aa88c4528df8ba15bc616f3be">3bd41572</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: clarify comment on cooked mode.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ded58a037774147073366ff2dfdc8965e02a96e5">ded58a03</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update lockfile signature and remove mistaken symbol in rts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2143c49273d7d87ee2f3ef1211856d60b1427af1">2143c492</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add winio and winio_threaded ways
Reverts many of the testsuite changes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0979cc53442b3a6202acab9cf164f0a4beea0b7">c0979cc5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-16T10:56:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge remote-tracking branch 'origin/wip/winio'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/750a1595ef31cdc335f3bab045b2f19a9c43ff93">750a1595</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add --copying-gc flag to reverse effect of --nonmoving-gc
Fixes #18281.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ba6a881c58459008f02fb4816f8dec2800c2b73">6ba6a881</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement `fullCompilerVersion`
Follow-up of https://gitlab.haskell.org/ghc/ghc/-/issues/18403
This MR adds `fullCompilerVersion`, a function that shares the same
backend as the `--numeric-version` GHC flag, exposing a full,
three-digit version datatype.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6cf27dfded59fe42bd6be323573c0d576e6204a">e6cf27df</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a Lint hadrian rule and an .hlint.yaml file in base/
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb177dd00c91d825e00ed228bce6cfeb7684bf7">bcb177dd</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow multiple case branches to have a higher rank type
As #18412 points out, it should be OK for multiple case alternatives
to have a higher rank type, provided they are all the same.
This patch implements that change. It sweeps away
GHC.Tc.Gen.Match.tauifyMultipleBranches, and friends, replacing it
with an enhanced version of fillInferResult.
The basic change to fillInferResult is to permit the case in which
another case alternative has already filled in the result; and in
that case simply unify. It's very simple actually.
See the new Note [fillInferResult] in TcMType
Other refactoring:
- Move all the InferResult code to one place, in GHC.Tc.Utils.TcMType
(previously some of it was in Unify)
- Move tcInstType and friends from TcMType to Instantiate, where it
more properly belongs. (TCMType was getting very long.)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5525a51900623e04ec914e9dcc7f4ad1fd3b528">e5525a51</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve typechecking of NPlusK patterns
This patch (due to Richard Eisenberg) improves
documentation of the wrapper returned by tcSubMult
(see Note [Wrapper returned from tcSubMult] in
GHC.Tc.Utils.Unify).
And, more substantially, it cleans up the multiplicity
handling in the typechecking of NPlusKPat
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12f9035200424ec8104484f154a040d612fee99d">12f90352</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove {-# CORE #-} pragma (part of #18048)
This pragma has no effect since 2011.
It was introduced for External Core, which no longer exists.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e504c9137dff2b8f51e8ed96b5cbb5a0d19f8e3a">e504c913</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the simplification of join binders
This MR (for #18449) refactors the Simplifier's treatment
of join-point binders.
Specifically, it puts together, into
GHC.Core.Opt.Simplify.Env.adjustJoinPointType
two currently-separate ways in which we adjust the type of
a join point. As the comment says:
-- (adjustJoinPointType mult new_res_ty join_id) does two things:
--
-- 1. Set the return type of the join_id to new_res_ty
-- See Note [Return type for join points]
--
-- 2. Adjust the multiplicity of arrows in join_id's type, as
-- directed by 'mult'. See Note [Scaling join point arguments]
I think this actually fixes a latent bug, by ensuring that the
seIdSubst and seInScope have the right multiplicity on the type
of join points.
I did some tidying up while I was at it. No more
setJoinResTy, or modifyJoinResTy: instead it's done locally in
Simplify.Env.adjustJoinPointType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49b265f08c7ac9c9dea6cfff0d67447728b7b416">49b265f0</a></strong>
<div>
<span>by Chaitanya Koparkar</span>
<i>at 2020-07-18T07:26:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minor typos in a Core.hs note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d59aed6e9f494d6eae41c5ba32cde23cecaeb14">8d59aed6</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHCi: Fix isLittleEndian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c26e81d116a653b5259aeb290fb1e697efe3382a">c26e81d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci tests as fragile under unreg compiler
In particular I have seen T16012 fail repeatedly under the
unregisterised compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/868e452340ade3155dd7e552c16bbb3c21c42b8a">868e4523</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "AArch32 symbols only on aarch32."
This reverts commit cdfeb3f24f76e8fd30452016676e56fbc827789a.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c915ba84f4ec8c4f0f006bd6aa938d17936dcd93">c915ba84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Fix (1)"
This reverts commit 7abffced01f5680efafe44f6be2733eab321b039.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/777c452a83ebdb2b50f3f328255a6f36ae49f398">777c452a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "better if guards."
This reverts commit 3f60b94de1f460ca3f689152860b108a19ce193e.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a">0dd40552</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "[linker/rtsSymbols] More linker symbols"
This reverts commit 686e72253aed3880268dd6858eadd8c320f09e97.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30caeee75193ea961c55ee847a3156e23116e84e">30caeee7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-21T06:39:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)
* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
convenient to thread StgPprOpts or DynFlags down to the ppr function
call)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/863c544c9849e49872acac64b8faea56a3311564">863c544c</a></strong>
<div>
<span>by Mark</span>
<i>at 2020-07-21T06:39:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in existential_quantification.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05910be1ac5c1f485132d2c8bd1ceb4f86e06db5">05910be1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-21T14:47:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release notes entry for #17816
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a625719284db7c69fa3d122e829291a16960e85f">a6257192</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-07-21T14:47:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a newtype `Code` for the return type of typed quotations (Proposal #195)
There are three problems with the current API:
1. It is hard to properly write instances for ``Quote m => m (TExp a)`` as the type is the composition
of two type constructors. Doing so in your program involves making your own newtype and
doing a lot of wrapping/unwrapping.
For example, if I want to create a language which I can either run immediately or
generate code from I could write the following with the new API. ::
class Lang r where
_int :: Int -> r Int
_if :: r Bool -> r a -> r a -> r a
instance Lang Identity where
_int = Identity
_if (Identity b) (Identity t) (Identity f) = Identity (if b then t else f)
instance Quote m => Lang (Code m) where
_int = liftTyped
_if cb ct cf = [|| if $$cb then $$ct else $$cf ||]
2. When doing code generation it is common to want to store code fragments in
a map. When doing typed code generation, these code fragments contain a
type index so it is desirable to store them in one of the parameterised
map data types such as ``DMap`` from ``dependent-map`` or ``MapF`` from
``parameterized-utils``.
::
compiler :: Env -> AST a -> Code Q a
data AST a where ...
data Ident a = ...
type Env = MapF Ident (Code Q)
newtype Code m a = Code (m (TExp a))
In this example, the ``MapF`` maps an ``Ident String`` directly to a ``Code Q String``.
Using one of these map types currently requires creating your own newtype and constantly
wrapping every quotation and unwrapping it when using a splice. Achievable, but
it creates even more syntactic noise than normal metaprogramming.
3. ``m (TExp a)`` is ugly to read and write, understanding ``Code m a`` is
easier. This is a weak reason but one everyone
can surely agree with.
Updates text submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58235d46bd4e9fbf69bd82969b29cd9c6ab051e1">58235d46</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-21T14:47:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :rts-flag:`--copying-gc` documentation
It was missing a newline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19e80b9af252eee760dc047765a9930ef00067ec">19e80b9a</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-21T14:50:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accumulate Haddock comments in P (#17544, #17561, #8944)
Haddock comments are, first and foremost, comments. It's very annoying
to incorporate them into the grammar. We can take advantage of an
important property: adding a Haddock comment does not change the parse
tree in any way other than wrapping some nodes in HsDocTy and the like
(and if it does, that's a bug).
This patch implements the following:
* Accumulate Haddock comments with their locations in the P monad.
This is handled in the lexer.
* After parsing, do a pass over the AST to associate Haddock comments
with AST nodes using location info.
* Report the leftover comments to the user as a warning (-Winvalid-haddock).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c719460611e7af44a67041c1707cb206d724d58">4c719460</a></strong>
<div>
<span>by David Binder</span>
<i>at 2020-07-22T20:17:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix dead link to haskell prime discussion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2f817e4c547657c25bb110199f6f0b6014f843b">f2f817e4</a></strong>
<div>
<span>by BinderDavid</span>
<i>at 2020-07-22T20:17:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace broken links to old haskell-prime site by working links to gitlab instance.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bf8980ec86cab8d605149bbf47ed2361e2d389e">0bf8980e</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove length field from FastString
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1010c33bb8704fa55a82bc2601d5cae2e6ecc21f">1010c33b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ShortByteString for FastString
There are multiple reasons we want this:
- Fewer allocations: ByteString has 3 fields, ShortByteString just has one.
- ByteString memory is pinned:
- This can cause fragmentation issues (see for example #13110) but also
- makes using FastStrings in compact regions impossible.
Metric Decrease:
T5837
T12150
T12234
T12425
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8336ba78e00ec42521ba8314bc65ec766e6bcc7d">8336ba78</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass specialised utf8DecodeChar# to utf8DecodeLazy# for performance
Currently we're passing a indexWord8OffAddr# type function to
utf8DecodeLazy# which then passes it on to utf8DecodeChar#. By passing one
of utf8DecodeCharAddr# or utf8DecodeCharByteArray# instead we benefit from
the inlining and specialization already done for those.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7484a9a47ad277bb7e51c6357817f7e7c59e744a">7484a9a4</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Add comment about tricky ForeignPtr lifetime
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5536ed28b676106810e65bac15305ad2b1b0babd">5536ed28</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use IO constructor instead of `stToIO . ST`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b8902e3975b8275b027b3d1cfe0d8cb8fdd3d13">5b8902e3</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Remove redundant use of withForeignPtr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5976a1614e3da7d77f624103bb67f602738e93b8">5976a161</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Reformat utf8EncodeShortByteString to be more consistent
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ddf161492194edb321b87b1977eda8264df35aa">9ddf1614</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FastString: Reintroduce character count cache
Metric Increase:
ManyConstructors
Metric Decrease:
T4029
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9491668640227a7ae7f6d0506d36af3a10cdd49">e9491668</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-22T20:18:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">get-win32-tarballs: Fix detection of missing tarballs
This fixes the error message given by configure when the user
attempts to configure without first download the win32 tarballs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f3ff8fd24b94c9d4a221e6aba3e21de42b0f02c">9f3ff8fd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-22T20:19:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable BangPatterns, ScopedTypeVariables for ghc and hadrian by default.
This is only for their respective codebases.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f17b930c164f3130caf2215484a8f5f8aa3cc63">0f17b930</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused "ncg" flag
This flag has been removed in 066b369de2c6f7da03c88206288dca29ab061b31
in 2011.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bab4ec8f62352a6361a5fd2cbdc5f12eca8928e7">bab4ec8f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't panic if the NCG isn't built (it is always built)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea33edb2beb64cde7d51777787e232d4cd4fef1">8ea33edb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused sGhcWithNativeCodeGen
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e079bb721e25dbc19e1adf8c8051b6ea03752962">e079bb72</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correctly test active backend
Previously we used a platform settings to detect if the native code
generator was used. This was wrong. We need to use the
`DynFlags.hscTarget` field instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/735f9d6bac316a0c1c68a8b49bba465f07b01cdd">735f9d6b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace ghcWithNativeCodeGen with a proper Backend datatype
* Represent backends with a `Backend` datatype in GHC.Driver.Backend
* Don't detect the default backend to use for the target platform at
compile time in Hadrian/make but at runtime. It makes "Settings"
simpler and it is a step toward making GHC multi-target.
* The latter change also fixes hadrian which has not been updated to
take into account that the NCG now supports AIX and PPC64 (cf
df26b95559fd467abc0a3a4151127c95cb5011b9 and
d3c1dda60d0ec07fc7f593bfd83ec9457dfa7984)
* Also we don't treat iOS specifically anymore (cf
cb4878ffd18a3c70f98bdbb413cd3c4d1f054e1f)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7cc431341e5b5b31758eecc8504cae8b2390c10">f7cc4313</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace HscTarget with Backend
They both have the same role and Backend name is more explicit.
Metric Decrease:
T3064
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee">15ce1804</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-22T20:20:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deprecate -fdmd-tx-dict-sel.
It's behaviour is now unconditionally enabled as
it's slightly beneficial.
There are almost no benchmarks which benefit from
disabling it, so it's not worth the keep this
configurable.
This fixes #18429.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff1b7710c9975a3cc1025cb5b9d29197a5f1a98a">ff1b7710</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:21:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #18064
It has been fixed by 0effc57d48ace6b719a9f4cbeac67c95ad55010b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfa89149b55837f822ba619b797781813fdcdabc">cfa89149</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-22T20:21:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define type Void# = (# #) (#18441)
There's one backwards compatibility issue: GHC.Prim no longer exports
Void#, we now manually re-export it from GHC.Exts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02f40b0da2eadbf8a0e2930b95d4cef686acd92f">02f40b0d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-07-22T20:22:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #18478
!3392 backported !2993 to GHC 8.10.2 which most probably is responsible
for fixing #18478, which triggered a pattern match checker performance
regression in GHC 8.10.1 as first observed in #17977.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f44df1ec6df2b02be83e41cec4dc3b5f7f540f0">7f44df1e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:23:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactoring of Unit display
* for consistency, try to always use UnitPprInfo to display units to
users
* remove some uses of `unitPackageIdString` as it doesn't show the
component name and it uses String
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dff1cb3d9c111808fec60190747272b973547c52">dff1cb3d</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-23T07:55:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker] Fix out of range relocations.
mmap may return address all over the place. mmap_next will ensure we get
the next free page after the requested address.
This is especially important for linking on aarch64, where the memory model with PIC
admits relocations in the +-4GB range, and as such we can't work with
arbitrary object locations in memory.
Of note: we map the rts into process space, so any mapped objects must
not be ouside of the 4GB from the processes address space.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdd0ff16f20ce920c74f9128a1067cbe1bd378c2">cdd0ff16</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-24T18:12:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: restore console cp on exit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f4f81d3a439cd1a8128e4ab11c7caac7cc0ad8">c1f4f81d</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-24T18:13:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: change memory allocation strategy and fix double free errors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ba205046e4f2ea94b1c978c050b917de4daaf092">ba205046</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-24T18:13:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with occCheckExpand in kind of occurrences
Issue #18451 showed that we could get an infinite type, through
over-use of occCheckExpand in the kind of an /occurrence/ of a
type variable.
See Note [Occurrence checking: look inside kinds] in GHC.Core.Type
This patch fixes the problem by making occCheckExpand less eager
to expand synonyms in kinds.
It also improves pretty printing of kinds, by *not* suppressing
the kind on a tyvar-binder like
(a :: Const Type b)
where type Const p q = p. Even though the kind of 'a' is Type,
we don't want to suppress the kind ascription. Example: the
error message for polykinds/T18451{a,b}. See GHC.Core.TyCo.Ppr
Note [Suppressing * kinds].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02133353e712e98bfbbc6ed32305b137bb3654eb">02133353</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-07-25T00:44:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify XRec definition
Change `Located X` usage to `XRec pass X`
This increases the scope of the LPat experiment to almost all of GHC.
Introduce UnXRec and MapXRec classes
Fixes #17587 and #18408
Updates haddock submodule
Co-authored-by: Philipp Krüger <philipp.krueger1@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e443846ba05c943877e193a9518d5817e15560f3">e443846b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: store printer in TraceBinIfaceReading
We don't need to pass the whole DynFlags, just pass the logging
function, if any.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b2b44fe35292dc3ac93ec215c44fba42165f67">15b2b44f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Driver.Ways into GHC.Platform.Ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/342a01af624840ba94f22256079ff4f3cee09ca2">342a01af</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add GHC.Platform.Profile
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6333d7391068d8029eed3e8eff019b9e2c104c7b">6333d739</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put PlatformConstants into Platform
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9dfeca6c2019fdb46613a68ccd6e650e40c7baac">9dfeca6c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove platform constant wrappers
Platform constant wrappers took a DynFlags parameter, hence implicitly
used the target platform constants. We removed them to allow support
for several platforms at once (#14335) and to avoid having to pass
the full DynFlags to every function (#17957).
Metric Decrease:
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73145d57f961c73b5853da7881d6a21e48e05909">73145d57</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code in utils/derivConstants
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7721b923d53fb9eb93f80bb93b4c3bd976c05b4c">7721b923</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move GHC.Platform into the compiler
Previously it was in ghc-boot so that ghc-pkg could use it. However it
wasn't necessary because ghc-pkg only uses a subset of it: reading
target arch and OS from the settings file. This is now done via
GHC.Platform.ArchOS (was called PlatformMini before).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459afeb592d5ff6d338184f5ef248758ecda57a4">459afeb5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix build systems
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e2930c3e18235fda2b8b468cb0fefbe7d65f879">9e2930c3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump CountParserDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2db34bdfead7ad309d8fd01d4423554650cf4c">6e2db34b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add accessors to ArchOS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc0f6fbcd95f2dc69a8efabbee2d8a485c34cc47">fc0f6fbc</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-25T00:45:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require SMP support in order to build a threaded stage1
Fixes 18266
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7c4439a407ad85b76aab9301fda61e7c10183ff">a7c4439a</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-26T13:23:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document loadFramework changes. (#18446)
Adds commentary on the rationale for the changes made in merge request
!3689.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da7269a4472856ba701d956a247599f721e9915e">da7269a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/win32: Exit with EXIT_HEAPOVERFLOW if memory commit fails
Since switching to the two-step allocator, the `outofmem` test fails via
`osCommitMemory` failing to commit. However, this was previously exiting
with `EXIT_FAILURE`, rather than `EXIT_HEAPOVERFLOW`. I think the latter
is a more reasonable exit code for this case and matches the behavior on
POSIX platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f153a1d0a3351ad4d94cef4cef8e63bab5b47008">f153a1d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update win32 output for parseTree
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e91672f0b7185bbafbe8ed1f2ae2cb775111f950">e91672f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Normalise WinIO error message differences
Previously the old Windows IO manager threw different errors than WinIO.
We now canonicalise these to the WinIO errors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9cbfe0868418a531da0872b0c477a15aa67f8861">9cbfe086</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Kill ssh-agent after pushing test metrics
Otherwise the Windows builds hang forever waiting for the process to
terminate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8236925fc8cc2e6e3fed61a0676fa65270a4a538">8236925f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:24:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: remove dead argument to stg_newIOPortzh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce0a1d678fbc8efa5fd384fd0227b7b3dc97cadd">ce0a1d67</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:25:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix detection of tty terminals
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52685cf7c077c51e3719e3c4dd5ca8257a99c4ea">52685cf7</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:25:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update codeowners
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aee45d9ea8c6cf4ebad4d5c732748923c7865cbe">aee45d9e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:06:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve NegativeLiterals (#18022, GHC Proposal #344)
Before this patch, NegativeLiterals used to parse x-1 as x (-1).
This may not be what the user expects, and now it is fixed:
x-1 is parsed as (-) x 1.
We achieve this by the following requirement:
* When lexing a negative literal,
it must not be preceded by a 'closing token'.
This also applies to unboxed literals, e.g. -1#.
See GHC Proposal #229 for the definition of a closing token.
A nice consequence of this change is that -XNegativeLiterals becomes a
subset of -XLexicalNegation. In other words, enabling both of those
extensions has the same effect as enabling -XLexicalNegation alone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/667ab69e5edacb2ce2f42fb810cd54c8f856d30b">667ab69e</a></strong>
<div>
<span>by leiftw</span>
<i>at 2020-07-27T07:07:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix typo referring to non-existent `-ohidir` flag, should be `-hidir` I think</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ff89c173f39813f74d7bbf95770c5e40039f155">6ff89c17</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:08:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the parser a little
* Create a dedicated production for type operators
* Create a dedicated type for the UNPACK pragma
* Remove an outdated part of Note [Parsing data constructors is hard]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa054d32a8ff69c334293a0d6c9d11b83a236a96">aa054d32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:09:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop 32-bit Windows support
As noted in #18487, we have reached the end of this road.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6da73bbf97cca8bd64d70a26298e7f7ddad2ce52">6da73bbf</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add minimal test for #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47680cb76b068508fd16d052e0a3bed12e38ea5f">47680cb7</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use allocate, not ALLOC_PRIM_P for unpackClosure#
ALLOC_PRIM_P fails for large closures, by directly using allocate
we can handle closures which are larger than the block size.
Fixes #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d345c9680ab3d766ef43dd8389ccc1eaeca066c">3d345c96</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-27T20:10:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta-expand the Simplifier monad
This patch eta-expands the Simplifier's monad, using the method
explained in GHC.Core.Unify Note [The one-shot state monad trick].
It's part of the exta-expansion programme in #18202.
It's a tiny patch, but is worth a 1-2% reduction in bytes-allocated
by the compiler. Here's the list, based on the compiler-performance
tests in perf/compiler:
Reduction in bytes allocated
T10858(normal) -0.7%
T12425(optasm) -1.3%
T13056(optasm) -1.8%
T14683(normal) -1.1%
T15164(normal) -1.3%
T15630(normal) -1.4%
T17516(normal) -2.3%
T18282(normal) -1.6%
T18304(normal) -0.8%
T1969(normal) -0.6%
T4801(normal) -0.8%
T5321FD(normal) -0.7%
T5321Fun(normal) -0.5%
T5642(normal) -0.9%
T6048(optasm) -1.1%
T9020(optasm) -2.7%
T9233(normal) -0.7%
T9675(optasm) -0.5%
T9961(normal) -2.9%
WWRec(normal) -1.2%
Metric Decrease:
T12425
T9020
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57aca6bba1c000f8542ce94e8b724b0334ff96d4">57aca6bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that Hadrian jobs don't download artifacts
Previously the Hadrian jobs had the default dependencies, meaning that
they would download artifacts from all jobs of earlier stages. This is
unneccessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a815cea9fa11ce6ef22aec3525dd7a0df541daf">0a815cea</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump bootstrap compiler to 8.8.4
Hopefully this will make the Windows jobs a bit more reliable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bd60059b0edfee9e8f66c6817257bbb946656cd">0bd60059</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-28T02:01:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">This patch addresses the exponential blow-up in the simplifier.
Specifically:
#13253 exponential inlining
#10421 ditto
#18140 strict constructors
#18282 another nested-function call case
This patch makes one really significant changes: change the way that
mkDupableCont handles StrictArg. The details are explained in
GHC.Core.Opt.Simplify Note [Duplicating StrictArg].
Specific changes
* In mkDupableCont, when making auxiliary bindings for the other arguments
of a call, add extra plumbing so that we don't forget the demand on them.
Otherwise we haev to wait for another round of strictness analysis. But
actually all the info is to hand. This change affects:
- Make the strictness list in ArgInfo be [Demand] instead of [Bool],
and rename it to ai_dmds.
- Add as_dmd to ValArg
- Simplify.makeTrivial takes a Demand
- mkDupableContWithDmds takes a [Demand]
There are a number of other small changes
1. For Ids that are used at most once in each branch of a case, make
the occurrence analyser record the total number of syntactic
occurrences. Previously we recorded just OneBranch or
MultipleBranches.
I thought this was going to be useful, but I ended up barely
using it; see Note [Note [Suppress exponential blowup] in
GHC.Core.Opt.Simplify.Utils
Actual changes:
* See the occ_n_br field of OneOcc.
* postInlineUnconditionally
2. I found a small perf buglet in SetLevels; see the new
function GHC.Core.Opt.SetLevels.hasFreeJoin
3. Remove the sc_cci field of StrictArg. I found I could get
its information from the sc_fun field instead. Less to get
wrong!
4. In ArgInfo, arrange that ai_dmds and ai_discs have a simpler
invariant: they line up with the value arguments beyond ai_args
This allowed a bit of nice refactoring; see isStrictArgInfo,
lazyArgcontext, strictArgContext
There is virtually no difference in nofib. (The runtime numbers
are bogus -- I tried a few manually.)
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
fft +0.0% -2.0% -48.3% -49.4% 0.0%
multiplier +0.0% -2.2% -50.3% -50.9% 0.0%
--------------------------------------------------------------------------------
Min -0.4% -2.2% -59.2% -60.4% 0.0%
Max +0.0% +0.1% +3.3% +4.9% 0.0%
Geometric Mean +0.0% -0.0% -33.2% -34.3% -0.0%
Test T18282 is an existing example of these deeply-nested strict calls.
We get a big decrease in compile time (-85%) because so much less
inlining takes place.
Metric Decrease:
T18282
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ee07b494ddd0131d53ea2fd6a4bb29cd05f4dd8">6ee07b49</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-28T02:02:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add support for negative shifts (fix #18499)
shiftR/shiftL support negative arguments despite Haskell 2010 report
saying otherwise. We explicitly test for negative values which is bad
(it gets in the way of constant folding, etc.). Anyway, for consistency
we fix Bits instancesof Integer/Natural.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f305bbfd0d7afee8fe7464252fbfc167205220ae">f305bbfd</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-28T02:03:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">config: Fix Haskell platform constructor w/ params
Fixes #18505
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/318bb17c9d3fbbe68eff706c38eb8e653cea3d83">318bb17c</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-07-28T20:54:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in haddock
Spotted by `vilpan` on `#haskell`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39c89862161bf488a6aca9372cbb67690f436ce7">39c89862</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-28T20:54:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc/mk: don't build gmp packages for BIGNUM_BACKEND=native
Before this change make-based `BIGNUM_BACKEND=native` build was failing as:
```
x86_64-pc-linux-gnu-gcc: error: libraries/ghc-bignum/gmp/objs/*.o: No such file or directory
```
This happens because ghc.mk was pulling in gmp-dependent
ghc-bignum library unconditionally. The change avoid building
ghc-bignum.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9a880fce484d0a87bb794b9d2d8a73e54819011">b9a880fc</a></strong>
<div>
<span>by Felix Wiemuth</span>
<i>at 2020-07-29T15:06:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c59064b0c60d3d779f5fd067be4b6648d8de23cf">c59064b0</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #16341
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a61411cab31fcc08f1dcd629b85c736e2b5b6bc7">a61411ca</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass dit_rep_tc_args to dsm_stock_gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a26498daa4d87a15b3e829c204ed6e9b4323f684">a26498da</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass tc_args to gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44b11bad052eabf43246acba6aab814376b08713">44b11bad</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Filter out unreachable constructors when deriving stock instances (#16431)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbc5191640761ca9773abc898c077363b7beb4e7">bbc51916</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-29T15:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill off sc_mult and as_mult fields
They are readily derivable from other fields, so this is more
efficient, and less error prone.
Fixes #18494
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3db4b4c5b7f5d2a62ebd88e174fca07d04c4e18">e3db4b4c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-29T15:08:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix build system on ARM
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96c31ea1f0303ebabc59edccff2e88444fe02722">96c31ea1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-29T15:09:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bug in Natural multiplication (fix #18509)
A bug was lingering in Natural multiplication (inverting two limbs)
despite QuickCheck tests used during the development leading to wrong
results (independently of the selected backend).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1dc3d7b89ea79aea158ee487234d3730e857f04">e1dc3d7b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-29T15:09:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix validation errors (#18510)
Test T2632 is a stage1 test that failed because of the Q => Quote change.
The remaining tests did not use quotation and failed when the path
contained a space.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c68a84254d70280e2dc73485f361787a3503850">6c68a842</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">For `-fkeep-going` do not duplicate dependency edge code
We now compute the deps for `-fkeep-going` the same way that the
original graph calculates them, so the edges are correct. Upsweep really
ought to take the graph rather than a topological sort so we are never
recalculating anything, but at least things are recaluclated
consistently now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/502de55676a38572db60848c13392f5f115e1c8a">502de556</a></strong>
<div>
<span>by cgibbard</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add haddock comment for unfilteredEdges
and move the note about drop_hs_boot_nodes into it.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7">01c948eb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:11:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the inferred type variable restriction
This patch primarily:
* Documents `checkInferredVars` (previously called
`check_inferred_vars`) more carefully. This is the
function which throws an error message if a user quantifies an
inferred type variable in a place where specificity cannot be
observed. See `Note [Unobservably inferred type variables]` in
`GHC.Rename.HsType`.
Note that I now invoke `checkInferredVars` _alongside_
`rnHsSigType`, `rnHsWcSigType`, etc. rather than doing so _inside_
of these functions. This results in slightly more call sites for
`checkInferredVars`, but it makes it much easier to enumerate the
spots where the inferred type variable restriction comes into
effect.
* Removes the inferred type variable restriction for default method
type signatures, per the discussion in #18432. As a result, this
patch fixes #18432.
Along the way, I performed some various cleanup:
* I moved `no_nested_foralls_contexts_err` into `GHC.Rename.Utils`
(under the new name `noNestedForallsContextsErr`), since it now
needs to be invoked from multiple modules. I also added a helper
function `addNoNestedForallsContextsErr` that throws the error
message after producing it, as this is a common idiom.
* In order to ensure that users cannot sneak inferred type variables
into `SPECIALISE instance` pragmas by way of nested `forall`s, I
now invoke `addNoNestedForallsContextsErr` when renaming
`SPECIALISE instance` pragmas, much like when we rename normal
instance declarations. (This probably should have originally been
done as a part of the fix for #18240, but this task was somehow
overlooked.) As a result, this patch fixes #18455 as a side effect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d47324ce49b0c4f419823cbd7fd47e134a1b255a">d47324ce</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:12:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't mark closed type family equations as occurrences
Previously, `rnFamInstEqn` would mark the name of the type/data
family used in an equation as an occurrence, regardless of what sort
of family it is. Most of the time, this is the correct thing to do.
The exception is closed type families, whose equations constitute its
definition and therefore should not be marked as occurrences.
Overzealously counting the equations of a closed type family as
occurrences can cause certain warnings to not be emitted, as observed
in #18470. See `Note [Type family equations and occurrences]` in
`GHC.Rename.Module` for the full story.
This fixes #18470 with a little bit of extra-casing in
`rnFamInstEqn`. To accomplish this, I added an extra
`ClosedTyFamInfo` field to the `NonAssocTyFamEqn` constructor of
`AssocTyFamInfo` and refactored the relevant call sites accordingly
so that this information is propagated to `rnFamInstEqn`.
While I was in town, I moved `wrongTyFamName`, which checks that the
name of a closed type family matches the name in an equation for that
family, from the renamer to the typechecker to avoid the need for an
`ASSERT`. As an added bonus, this lets us simplify the details of
`ClosedTyFamInfo` a bit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebe2cf4538fa46994ef67663ac8fd5e579579803">ebe2cf45</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:12:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove an incorrect WARN in extendLocalRdrEnv
I noticed this warning going off, and discovered that it's
really fine. This small patch removes the warning, and docments
what is going on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f71f69714255165d0fdc2790a588487ff9439dc">9f71f697</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:13:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two bangs to improve perf of flattening
This tiny patch improves the compile time of flatten-heavy
programs by 1-2%, by adding two bangs.
Addresses (somewhat) #18502
This reduces allocation by
T9872b -1.1%
T9872d -3.3%
T5321Fun -0.2%
T5631 -0.2%
T5837 +0.1%
T6048 +0.1%
Metric Decrease:
T9872b
T9872d
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c274cd530cc42a26028050b75d56b3437e06ec1">7c274cd5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minimal imports dump for boot files (fix #18497)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/175cb5b4044e6f4ad2224f54115f42e7a8b08f9b">175cb5b4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:55:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in datacon ppr
We don't need to use `sdocWithDynFlags` to know whether we should
display linear types for datacon types, we already have
`sdocLinearTypes` field in `SDocContext`. Moreover we want to remove
`sdocWithDynFlags` (#10143, #17957)).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380638a33691ba43fdcd2e18bca636750e5f66f1">380638a3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix powMod for gmp backend (#18515)
Also reenable integerPowMod test which had never been reenabled by
mistake.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56a7c19337c5b2aa21d521a6d7c965174ec8379b">56a7c193</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CLabel pretty-printing
Pretty-printing CLabel relies on sdocWithDynFlags that we want to remove
(#10143, #17957). It uses it to query the backend and the platform.
This patch exposes Clabel ppr functions specialised for each backend so
that backend code can directly use them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b15dc3cfb1a33e3d4d952af62d4d0b841a731f5">3b15dc3c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in GHC.CmmToAsm.Dwarf.Types
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e30fed6c6de1f881ce313900274294a793e42677">e30fed6c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-01T04:23:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test case for #17652
The issue was fixed by 19e80b9af252eee760dc047765a9930ef00067ec
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/226417424b2b578fd3c5424588367cb24e7720eb">22641742</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-02T16:44:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove ConDeclGADTPrefixPs
This removes the `ConDeclGADTPrefixPs` per the discussion in #18517.
Most of this patch simply removes code, although the code in the
`rnConDecl` case for `ConDeclGADTPrefixPs` had to be moved around a
bit:
* The nested `forall`s check now lives in the `rnConDecl` case for
`ConDeclGADT`.
* The `LinearTypes`-specific code that used to live in the
`rnConDecl` case for `ConDeclGADTPrefixPs` now lives in
`GHC.Parser.PostProcess.mkGadtDecl`, which is now monadic so that
it can check if `-XLinearTypes` is enabled.
Fixes #18157.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2d1accf67cb6e1dab6b2c78fef4b64526c31a4a">f2d1accf</a></strong>
<div>
<span>by Leon Schoorl</span>
<i>at 2020-08-02T16:44:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHC_STAGE definition generated by make
Fixes #18070
GHC_STAGE is the stage of the compiler we're building, it should be 1,2(,3?).
But make was generating 0 and 1.
Hadrian does this correctly using a similar `+ 1`:
https://gitlab.haskell.org/ghc/ghc/-/blob/eb8115a8c4cbc842b66798480fefc7ab64d31931/hadrian/src/Rules/Generate.hs#L245
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/947206f478d4eef641dfc58cb4c13471a23260c3">947206f4</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix running stage0/bin/ghc with wrong package DB. Fixes #17468.
In the invocation of `cabal configure`, `--ghc-pkg-option=--global-package-db`
was already given correctly to tell `stage0/bin/ghc-pkg` that it should use
the package DB in `stage1/`.
However, `ghc` needs to be given this information as well, not only `ghc-pkg`!
Until now that was not the case; the package DB in `stage0` was given to
`ghc` instead.
This was wrong, because there is no binary compatibility guarantee that says
that the `stage0` DB's `package.cache` (which is written by the
stage0 == system-provided ghc-pkg) can be deserialised by the `ghc-pkg`
from the source code tree.
As a result, when trying to add fields to `InstalledPackageInfo` that get
serialised into / deserialised from the `package.cache`, errors like
_build/stage0/lib/package.conf.d/package.cache: GHC.PackageDb.readPackageDb: inappropriate type (Not a valid Unicode code point!)
would appear. This was because the `stage0/bin/ghc would try to
deserialise the newly added fields from
`_build/stage0/lib/package.conf.d/package.cache`, but they were not in there
because the system `ghc-pkg` doesn't know about them and thus didn't write them
there.
It would try to do that because any GHC by default tries to read the global
package db in `../lib/package.conf.d/package.cache`.
For `stage0/bin/ghc` that *can never work* as explained above, so we
must disable this default via `-no-global-package-db` and give it the
correct package DB explicitly.
This is the same problem as #16534, and the same fix as in MR !780
(but in another context; that one was for developers trying out the
`stage0/bin/ghc` == `_build/ghc-stage1` interactively, while this fix
is for a `cabal configure` invocation).
I also noticed that the fix for #16534 forgot to pass `-no-global-package-db`,
and have fixed that in this commit as well.
It only worked until now because nobody tried to add a new ghc-pkg `.conf`
field since the introduction of Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef2ae81a394df573510b12b7e11bba0c931249d8">ef2ae81a</a></strong>
<div>
<span>by Alex Biehl</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hardcode RTS includes to cope with unregistered builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d613ed7624cbf39192d2a8cf29ab0c0fd2980a15">d613ed76</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add backward compat integer-gmp functions
Also enhance bigNatCheck# and isValidNatural test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f2f771869c65125ba013a5dd2b213061efe0fc2">3f2f7718</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add more BigNat compat functions in integer-gmp
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e12cd1733b581f48a5873b12971b6974778eabb">5e12cd17</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-05T04:00:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Core.Opt.Driver -> Core.Opt.Pipeline
Closes #18504.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bff2f87e43985e02bdde8c6fa39279df86cb617">2bff2f87</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "iserv: Don't pass --export-dynamic on FreeBSD"
This reverts commit 2290eb02cf95e9cfffcb15fc9c593d5ef79c75d9.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ce0db5a06598c88c6b8cb32043b878e7083dd4">53ce0db5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor handling of object merging
Previously to merge a set of object files we would invoke the linker as
usual, adding -r to the command-line. However, this can result in
non-sensical command-lines which causes lld to balk (#17962).
To avoid this we introduce a new tool setting into GHC, -pgmlm, which is
the linker which we use to merge object files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7013c3037538aa9c947a21dbbfd7c297929ac8">eb7013c3</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-05T04:01:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove all the unnecessary LANGUAGE pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbcb886d503dd7aaebc4c40e59615068b3fd0bd7">fbcb886d</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-05T04:01:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CodeQ and TExpQ levity polymorphic
The patch is quite straightforward. The only tricky part is that
`Language.Haskell.TH.Lib.Internal` now must be `Trustworthy` instead
of `Safe` due to the `GHC.Exts` import (in order to import `TYPE`).
Since `CodeQ` has yet to appear in any released version of
`template-haskell`, I didn't bother mentioning the change to `CodeQ`
in the `template-haskell` release notes.
Fixes #18521.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/686e06c59c3aa6b66895e8a501c7afb019b09e36">686e06c5</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Grammar for types and data/newtype constructors
Before this patch, we parsed types into a reversed sequence
of operators and operands. For example, (F x y + G a b * X)
would be parsed as [X, *, b, a, G, +, y, x, F],
using a simple grammar:
tyapps
: tyapp
| tyapps tyapp
tyapp
: atype
| PREFIX_AT atype
| tyop
| unpackedness
Then we used a hand-written state machine to assemble this
either into a type, using 'mergeOps',
or into a constructor, using 'mergeDataCon'.
This is due to a syntactic ambiguity:
data T1 a = MkT1 a
data T2 a = Ord a => MkT2 a
In T1, what follows after the = sign is a data/newtype constructor
declaration. However, in T2, what follows is a type (of kind
Constraint). We don't know which of the two we are parsing until we
encounter =>, and we cannot check for => without unlimited lookahead.
This poses a few issues when it comes to e.g. infix operators:
data I1 = Int :+ Bool :+ Char -- bad
data I2 = Int :+ Bool :+ Char => MkI2 -- fine
By this issue alone we are forced into parsing into an intermediate
representation and doing a separate validation pass.
However, should that intermediate representation be as low-level as a
flat sequence of operators and operands?
Before GHC Proposal #229, the answer was Yes, due to some particularly
nasty corner cases:
data T = ! A :+ ! B -- used to be fine, hard to parse
data T = ! A :+ ! B => MkT -- bad
However, now the answer is No, as this corner case is gone:
data T = ! A :+ ! B -- bad
data T = ! A :+ ! B => MkT -- bad
This means we can write a proper grammar for types, overloading it in
the DisambECP style, see Note [Ambiguous syntactic categories].
With this patch, we introduce a new class, DisambTD. Just like
DisambECP is used to disambiguate between expressions, commands, and patterns,
DisambTD is used to disambiguate between types and data/newtype constructors.
This way, we get a proper, declarative grammar for constructors and
types:
infixtype
: ftype
| ftype tyop infixtype
| unpackedness infixtype
ftype
: atype
| tyop
| ftype tyarg
| ftype PREFIX_AT tyarg
tyarg
: atype
| unpackedness atype
And having a grammar for types means we are a step closer to using a
single grammar for types and expressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6770e199645b0753d2edfddc68c199861a1be980">6770e199</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the story around runPV/runECP_P/runECP_PV
This patch started as a small documentation change, an attempt to make
Note [Parser-Validator] and Note [Ambiguous syntactic categories]
more clear and up-to-date.
But it turned out that runECP_P/runECP_PV are weakly motivated,
and it's easier to remove them than to find a good rationale/explanation
for their existence.
As the result, there's a bit of refactoring in addition to
a documentation update.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/826d07db0e0f31fe2b2d2e0661be7f0cb3cde3c7">826d07db</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix debug_ppr_ty ForAllTy (#18522)
Before this change, GHC would
pretty-print forall k. forall a -> ()
as forall @k a. ()
which isn't even valid Haskell.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ddb43848b9fc24f5404915f57dc504546e68292">0ddb4384</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix visible forall in ppr_ty (#18522)
Before this patch, this type:
T :: forall k -> (k ~ k) => forall j -> k -> j -> Type
was printed incorrectly as:
T :: forall k j -> (k ~ k) => k -> j -> Type
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2a432258fa00e22ca386ef30d0a77ff5b277db8">d2a43225</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fail eagerly on a lev-poly datacon arg
Close #18534.
See commentary in the patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63348155404c64334fa864454132630f9d2a4d7f">63348155</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-06T13:34:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a type alias for Ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9570c21295a2b4a1d1e40939869124f0b9b9bf91">9570c212</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-06T19:46:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Rename 8.12 to 9.0
GHC 8.12.1 has been renamed to GHC 9.0.1.
See also:
https://mail.haskell.org/pipermail/ghc-devs/2020-July/019083.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3907ee01e68b383fa30386d163decf203acedb19">3907ee01</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A fix to an error message in monad comprehensions, and a move of dsHandleMonadicFailure
as suggested by comments on !2330.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa9bb70a3fefef681cb0e80cc78977386c1dcf0a">fa9bb70a</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add some tests for fail messages in do-expressions and monad-comprehensions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f03606319f745b10e9918c76a47426b293f0bf9">5f036063</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">cmm: Clean up Notes a bit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6402c1240d5bd768b8fe8b4368413932bedbe107">6402c124</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmLint: Check foreign call argument register invariant
As mentioned in Note [Register parameter passing] the arguments of
foreign calls cannot refer to caller-saved registers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b36de030ecdd60897bc7a6a02bdeabd0825be4">15b36de0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nativeGen: One approach to fix #18527
Previously the code generator could produce corrupt C call sequences due
to register overlap between MachOp lowerings and the platform's calling
convention. We fix this using a hack described in Note [Evaluate C-call
arguments before placing in destination registers].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3847ae0ccf67bddf73304a39f5320c3ba285aa48">3847ae0c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18527
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd51d53be42114c105b5ab15fcbdb387526b1c17">dd51d53b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix prog001
Previously it failed as the `ghc` package was not visible.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4f1b73ad9f292a6bbeb21fee44b0ba1a7f3c33b">e4f1b73a</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-07T23:58:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations; tweaks for ghc-exactprint update
Remove unused ApiAnns, add one for linear arrow.
Include API Annotations for trailing comma in export list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a665db6174eaedbbae925c0ccb4c22b3f29bcaf">8a665db6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T23:58:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix double-negation in ld merge-objects check
We want to only run the check if ld is gold.
Fixes the fix to #17962.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a11c9678409b2e0a01e8aba153e094800f3641bf">a11c9678</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-08-09T11:32:25+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: depend on boot compiler version #18001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8873b52f6a16202c3cb839e988c1406b8f67cfe">c8873b52</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-09T21:17:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Api Annotations : Adjust SrcSpans for prefix bang (!).
And prefix ~
(cherry picked from commit 8dbee2c578b1f642d45561be3f416119863e01eb)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77398b678aba45ba25932a39b7e8a7a31d0dd6f3">77398b67</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-09T21:18:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid allocations in `splitAtList` (#18535)
As suspected by @simonpj in #18535, avoiding allocations in
`GHC.Utils.Misc.splitAtList` when there are no leftover arguments is
beneficial for performance:
On CI validate-x86_64-linux-deb9-hadrian:
T12227 -7%
T12545 -12.3%
T5030 -10%
T9872a -2%
T9872b -2.1%
T9872c -2.5%
Metric Decrease:
T12227
T12545
T5030
T9872a
T9872b
T9872c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ba41a0f7f5a8eeb39b73d0f0041a53549c377ab">8ba41a0f</a></strong>
<div>
<span>by Felix Yan</span>
<i>at 2020-08-10T20:23:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct a typo in ghc.mk</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c4692641dcaca3e90116c28d012c506108b386f">1c469264</a></strong>
<div>
<span>by Felix Yan</span>
<i>at 2020-08-10T20:23:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a closing parenthesis too
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acf537f9fefa31883b7cb28ff61b837ab7f8a44a">acf537f9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-10T20:24:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make splitAtList strict in its arguments
Also fix its slightly wrong comment
Metric Decrease:
T5030
T12227
T12545
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab4d15898c03a5db6741feb2028488facf032fa4">ab4d1589</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typecheck: Drop SPECIALISE pragmas when there is no unfolding
Previously the desugarer would instead fall over when it realized that
there was no unfolding for an imported function with a SPECIALISE
pragma. We now rather drop the SPECIALISE pragma and throw a warning.
Fixes #18118.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ac8c0a551619b52e0f151d6781b11dd66cf2110">0ac8c0a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18118
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c43078d7b78b4722dd30b56674c27189d2689ffe">c43078d7</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-08-11T22:18:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hie.yaml to ghc-heap
This enables IDE support by haskell-language-server for ghc-heap.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1088b3f31ceddf918a319c97557fb1f08a9a387">f1088b3f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:19:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Specify metrics collected by T17516
Previously it collected everything, including "max bytes used". This is
problematic since the test makes no attempt to control for deviations in
GC timing, resulting in high variability. Fix this by only collecting
"bytes allocated".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/accbc242e555822a2060091af7188ce6e9b0144e">accbc242</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-12T03:50:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: disentangle Outputable
- put panic related functions into GHC.Utils.Panic
- put trace related functions using DynFlags in GHC.Driver.Ppr
One step closer making Outputable fully independent of DynFlags.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db6dd810eb7986a39657f7f028f1f4de92b321dd">db6dd810</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-12T03:50:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase tolerance of T16916
T16916 (testing #16916) has been slightly fragile in CI due to its
reliance on CPU times. While it's hard to see how to eliminate
the time-dependence entirely, we can nevertheless make it more tolerant.
Fixes #16966.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bee43aca827387aa81a64801d82adcb596d01d9a">bee43aca</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-12T20:52:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rewrite and move the monad-state hack note
The note has been rewritten by @simonpj in !3851
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fdf25eb574d6d291673603ab36ac5ec7e37066">25fdf25e</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-12T20:53:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations: Fix parser for new GHC 9.0 features
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7831fe05021caa90d4696ca91ae2b31a82e65b3d">7831fe05</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-13T03:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">parser: Suggest ImportQualifiedPost in prepositive import warning
As suggested in #18545.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55dec4dc6e8f8430810d212c73e78ffbb92e0a48">55dec4dc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-08-13T03:44:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Better long-distance info for where bindings (#18533)
Where bindings can see evidence from the pattern match of the `GRHSs`
they belong to, but not from anything in any of the guards (which belong
to one of possibly many RHSs).
Before this patch, we did *not* consider said evidence, causing #18533,
where the lack of considering type information from a case pattern match
leads to failure to resolve the vanilla COMPLETE set of a data type.
Making available that information required a medium amount of
refactoring so that `checkMatches` can return a
`[(Deltas, NonEmpty Deltas)]`; one `(Deltas, NonEmpty Deltas)` for each
`GRHSs` of the match group. The first component of the pair is the
covered set of the pattern, the second component is one covered set per
RHS.
Fixes #18533.
Regression test case: T18533
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf97889a38edc3314a7b61e6e0b6e6d0f434c8a2">cf97889a</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-13T03:45:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-add BangPatterns to CodePage.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffc0d578ea22de02a68c64c094602701e65d8895">ffc0d578</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-13T09:49:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add HomeUnit type
Since Backpack the "home unit" is much more involved than what it was
before (just an identifier obtained with `-this-unit-id`). Now it is
used in conjunction with `-component-id` and `-instantiated-with` to
configure module instantiations and to detect if we are type-checking an
indefinite unit or compiling a definite one.
This patch introduces a new HomeUnit datatype which is much easier to
understand. Moreover to make GHC support several packages in the same
instances, we will need to handle several HomeUnits so having a
dedicated (documented) type is helpful.
Finally in #14335 we will also need to handle the case where we have no
HomeUnit at all because we are only loading existing interfaces for
plugins which live in a different space compared to units used to
produce target code. Several functions will have to be refactored to
accept "Maybe HomeUnit" parameters instead of implicitly querying the
HomeUnit fields in DynFlags. Having a dedicated type will make this
easier.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a51b2ab7433c06bddca9699b0dfd8ab1d11879b">8a51b2ab</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-13T21:09:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make IOEnv monad one-shot (#18202)
On CI (x86_64-linux-deb9-hadrian, compile_time/bytes_allocated):
T10421 -1.8% (threshold: +/- 1%)
T10421a -1.7% (threshold: +/- 1%)
T12150 -4.9% (threshold: +/- 2%)
T12227 -1.6 (threshold: +/- 1%)
T12425 -1.5% (threshold: +/- 1%)
T12545 -3.8% (threshold: +/- 1%)
T12707 -3.0% (threshold: +/- 1%)
T13035 -3.0% (threshold: +/- 1%)
T14683 -10.3% (threshold: +/- 2%)
T3064 -6.9% (threshold: +/- 2%)
T4801 -4.3% (threshold: +/- 2%)
T5030 -2.6% (threshold: +/- 2%)
T5321FD -3.6% (threshold: +/- 2%)
T5321Fun -4.6% (threshold: +/- 2%)
T5631 -19.7% (threshold: +/- 2%)
T5642 -13.0% (threshold: +/- 2%)
T783 -2.7 (threshold: +/- 2%)
T9020 -11.1 (threshold: +/- 2%)
T9961 -3.4% (threshold: +/- 2%)
T1969 (compile_time/bytes_allocated) -2.2% (threshold: +/-1%)
T1969 (compile_time/max_bytes_used) +24.4% (threshold: +/-20%)
Additionally on other CIs:
haddock.Cabal -10.0% (threshold: +/- 5%)
haddock.compiler -9.5% (threshold: +/- 5%)
haddock.base (max bytes used) +24.6% (threshold: +/- 15%)
T10370 (max bytes used, i386) +18.4% (threshold: +/- 15%)
Metric Decrease:
T10421
T10421a
T12150
T12227
T12425
T12545
T12707
T13035
T14683
T3064
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T783
T9020
T9961
haddock.Cabal
haddock.compiler
Metric Decrease 'compile_time/bytes allocated':
T1969
Metric Increase 'compile_time/max_bytes_used':
T1969
T10370
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f66fdf69b7bcdacbfc46e636668ad0fe509b1b6">9f66fdf6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-14T15:50:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Drop --io-manager flag from testsuite configuration
This is no longer necessary as there are now dedicated testsuite ways
which run tests with WinIO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55fd1dc55990623dcf3b2e6143e766242315d757">55fd1dc5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-14T15:51:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add i686 targets
Addresses #18422.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4cc57fa2df08f5b33a4cf86c3e041b8de9f6ebf">f4cc57fa</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-18T15:38:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow unsaturated runRW# applications
Previously we had a very aggressive Core Lint check which caught
unsaturated applications of runRW#. However, there is nothing
wrong with such applications and they may naturally arise in desugared
Core. For instance, the desugared Core of Data.Primitive.Array.runArray#
from the `primitive` package contains:
case ($) (runRW# @_ @_) (\s -> ...) of ...
In this case it's almost certain that ($) will be inlined, turning the
application into a saturated application. However, even if this weren't
the case there isn't a problem: CorePrep (after deleting an unnecessary
case) can simply generate code in its usual way, resulting in a call to
the Haskell definition of runRW#.
Fixes #18291.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ac6ae7c8d5a66bfe36973d1e92f3feef482d589">3ac6ae7c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-18T15:38:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18291
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a87a0b498f4c93c33e3db8d7f68fbaa5d812b408">a87a0b49</a></strong>
<div>
<span>by Eli Schwartz</span>
<i>at 2020-08-18T15:39:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">install: do not install sphinx doctrees
These files are 100% not needed at install time, and they contain
unreproducible info. See https://reproducible-builds.org/ for why this
matters.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/194b25ee97d93bc4bcb5bed9a0454debba7f2b6a">194b25ee</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-18T15:40:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Allow baseline commit to be set explicitly
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdcf76450348d0554b7fd1768331f9efaf691e13">fdcf7645</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-18T15:40:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use MR base commit as performance baseline
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ad5cab33b8b78a346896cc6de555365c73e6298">9ad5cab3</a></strong>
<div>
<span>by Fendor</span>
<i>at 2020-08-18T15:40:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose UnitInfoMap as it is part of the public API
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa4b744d51aa6bdb46064f981ea8e001627921d6">aa4b744d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-18T22:11:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Only run llvm ways if llc is available
As noted in #18560, we previously would always run the LLVM ways since
`configure` would set `SettingsLlcCommand` to something non-null when
it otherwise couldn't find the `llc` executable. Now we rather probe for
the existence of the `llc` executable in the testsuite driver.
Fixes #18560.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c5ed5c7eb30bc5462b67ff097c3388597265a4b">0c5ed5c7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-18T22:12:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: refactor GHC.CmmToAsm (#17957, #10143)
This patch removes the use of `sdocWithDynFlags` from GHC.CmmToAsm.*.Ppr
To do that I've had to make some refactoring:
* X86' and PPC's `Instr` are no longer `Outputable` as they require a
`Platform` argument
* `Instruction` class now exposes `pprInstr :: Platform -> instr -> SDoc`
* as a consequence, I've refactored some modules to avoid .hs-boot files
* added (derived) functor instances for some datatypes parametric in the
instruction type. It's useful for pretty-printing as we just have to
map `pprInstr` before pretty-printing the container datatype.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/731c8d3bc5a84515793e5dadb26adf52f9280e13">731c8d3b</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-08-19T18:47:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -Wredundant-bang-patterns (#17340)
Add new flag '-Wredundant-bang-patterns' that enables checks for "dead" bangs.
Dead bangs are the ones that under no circumstances can force a thunk that
wasn't already forced. Dead bangs are a form of redundant bangs. The new check
is performed in Pattern-Match Coverage Checker along with other checks (namely,
redundant and inaccessible RHSs). Given
f :: Bool -> Int
f True = 1
f !x = 2
we can detect dead bang patterns by checking whether @x ~ ⊥@ is satisfiable
where the PmBang appears in 'checkGrdTree'. If not, then clearly the bang is
dead. Such a dead bang is then indicated in the annotated pattern-match tree by
a 'RedundantSrcBang' wrapping. In 'redundantAndInaccessibles', we collect
all dead bangs to warn about.
Note that we don't want to warn for a dead bang that appears on a redundant
clause. That is because in that case, we recommend to delete the clause wholly,
including its leading pattern match.
Dead bang patterns are redundant. But there are bang patterns which are
redundant that aren't dead, for example
f !() = 0
the bang still forces the match variable, before we attempt to match on (). But
it is redundant with the forcing done by the () match. We currently don't
detect redundant bangs that aren't dead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb9bdaef6024558696e1e50b12d7fefb70483a9f">eb9bdaef</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-08-19T18:48:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add right-to-left rule for pattern bindings
Fix #18323 by adding a few lines of code to handle non-recursive
pattern bindings. see GHC.Tc.Gen.Bind
Note [Special case for non-recursive pattern bindings]
Alas, this confused the pattern-match overlap checker; see #18323.
Note that this patch only affects pattern bindings like that
for (x,y) in this program
combine :: (forall a . [a] -> a) -> [forall a. a -> a]
-> ((forall a . [a] -> a), [forall a. a -> a])
breaks = let (x,y) = combine head ids
in x y True
We need ImpredicativeTypes for those [forall a. a->a] types to be
valid. And with ImpredicativeTypes the old, unprincipled "allow
unification variables to unify with a polytype" story actually
works quite well. So this test compiles fine (if delicatedly) with
old GHCs; but not with QuickLook unless we add this patch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/293c7fba6cde31151baaf2a92c723605ed458ade">293c7fba</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-21T09:36:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put CFG weights into their own module (#17957)
It avoids having to query DynFlags to get them
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50eb4460cd8412387e0c3755a9e0bafaced12bb2">50eb4460</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-21T09:36:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use DynFlags in CmmToAsm.BlockLayout (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/659eb31b7a40f0aa2ba43c3454b5d9006fde837d">659eb31b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-21T09:36:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: Dwarf configuration
* remove references to DynFlags in GHC.CmmToAsm.Dwarf
* add specific Dwarf options in NCGConfig instead of directly querying
the debug level
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d8ca9170328249a436c3b5647b8e548d32b11c8">2d8ca917</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-21T09:37:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -ddump-stg flag
-ddump-stg was dumping the initial STG (just after Core-to-STG pass)
which was misleading because we want the final STG to know if a function
allocates or not. Now we have a new flag -ddump-stg-from-core for this and
-ddump-stg is deprecated.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fddddbf47d6ba2b1b3b6ec89bd40c8fa020e6606">fddddbf4</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-21T09:37:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Import qualified Prelude in Cmm/Parser.y
In preparation for the next version of 'happy', c95920 added a qualified
import to GHC/Parser.y but for some reason neglected GHC/Cmm/Parser.y
This patch adds the missing qualified import to GHC/Cmm/Parser.y and
also adds a clarifying comment to explain why this import is needed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/989c1c27b1ec69d8cf56b438f0173d92c3547ab5">989c1c27</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-21T11:27:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Test master branch as well
While these builds are strictly speaking redundant (since every commit
is tested by @marge-bot before making it into `master`), they are nevertheless
useful as they are displayed in the branch's commit list in GitLab's web interface.
Fixes #18595.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e67ae884ebe42cb31fc4230301a5f555ae23cce8">e67ae884</a></strong>
<div>
<span>by Aditya Gupta</span>
<i>at 2020-08-22T03:29:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">mkUnique refactoring (#18362)
Move uniqFromMask from Unique.Supply to Unique.
Move the the functions that call mkUnique from Unique to Builtin.Uniques
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03cfcfd450335d5ecb63fec1f55d9feafabb2b4c">03cfcfd4</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-08-22T03:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ubuntu 20.04 jobs for nightly and release
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f50154591ada9064351ccec4adfe6df53ca2439">3f501545</a></strong>
<div>
<span>by Craig Ferguson</span>
<i>at 2020-08-22T03:30:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Utils: clarify docs slightly
The previous comment implies `nTimes n f` is either `f^{n+1}` or
`f^{2^n}` (when in fact it's `f^n`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b86509270227dbc61f0700c7d9261a4c7672361">8b865092</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-23T14:12:53+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not print synonyms in :i (->), :i Type (#18594)
This adds a new printing flag `sdocPrintTypeAbbreviations` that is used
specifically to avoid ghci printing 'type (->) = (->)' and 'type Type = Type'.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8f61182c3bdd1b6121c83be632b4941b907de88">d8f61182</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-23T14:12:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move pprTyTcApp' inside pprTyTcApp
No semantic change
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/364258e0ad25bc95e69745554f5ca831ce80baf8">364258e0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-24T00:32:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix types in silly shifts (#18589)
Patch written by Simon. I have only added a testcase.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1eb38a0a7168d7612c791c4289cc02d900d402f">b1eb38a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-24T00:33:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Perf: make SDoc monad one-shot (#18202)
With validate-x86_64-linux-deb9-hadrian:
T1969 -3.4% (threshold: +/-1%)
T3294 -3.3% (threshold: +/-1%)
T12707 -1.4% (threshold: +/-1%)
Additionally with validate-x86_64-linux-deb9-unreg-hadrian:
T4801 -2.4% (threshold: +/-2%)
T13035 -1.4% (threshold: +/-1%)
T13379 -2.4% (threshold: +/-2%)
ManyAlternatives -2.5% (threshold: +/-2%)
ManyConstructors -3.0% (threshold: +/-2%)
Metric Decrease:
T12707
T1969
T3294
ManyAlternatives
ManyConstructors
T13035
T13379
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a77b9ec2a6153065565bca7bb154fff35b830b82">a77b9ec2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-24T10:04:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #18397
The bug was fixed by !3421.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05550a5abc369e1cc4fc48def532ca9ba9adcad7">05550a5a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-24T10:04:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid roundtrip through SDoc
As found by @monoidal on https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3885#note_295126
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a1ecc5fd45a46372c3935df596f05432db1b270">0a1ecc5f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-25T07:37:05-04:00</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>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db8793ad417ebfcb57d42e8111674a90706a7918">db8793ad</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-08-25T07:37:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use tcView, not coreView, in the pure unifier.
Addresses a lingering point within #11715.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb77207a23deade8e3f8598c34598535711264cc">fb77207a</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-08-25T07:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use LIdP rather than (XRec p (IdP p))
This patch mainly just replaces use of
XRec p (IdP p)
with
LIdP p
One slightly more significant change is to parameterise
HsPatSynDetails over the pass rather than the argument type,
so that it's uniform with HsConDeclDetails and HsConPatDetails.
I also got rid of the dead code GHC.Hs.type.conDetailsArgs
But this is all just minor refactoring. No change in functionality.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8426a1364ba450fe48fc41a95b2ba76c8d1bb7c8">8426a136</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-25T07:38:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #18585
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d635a50b81732b2512b68c652aee36f489b5969">2d635a50</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-26T04:50:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linters: Make CPP linter skip image files
This patch adds an exclusion rule for `docs/users_guide/images`,
to avoid lint errors of PDF files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7d98cb2606997e05ad6406929dae3aba746fbb9">b7d98cb2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-26T04:50:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Color the logo on the front page of the PDF
This patch updates the logo with a recent color scheme.
This affects only the PDF version of the user's guide.
See also:
* https://mail.haskell.org/pipermail/ghc-devs/2020-August/019139.html
* https://gitlab.haskell.org/ghc/ghc/-/wikis/logo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b17fa185aec793861364afd9a05aa4219fbc019">0b17fa18</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-26T04:50:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitId pretty-printing
When we pretty-print a UnitId for the user, we try to map it back to its
origin package name, version and component to print
"package-version:component" instead of some hash.
The UnitId type doesn't carry these information, so we have to look into
a UnitState to find them. This is why the Outputable instance of
UnitId used `sdocWithDynFlags` in order to access the `unitState` field
of DynFlags.
This is wrong for several reasons:
1. The DynFlags are accessed when the message is printed, not when it is
generated. So we could imagine that the unitState may have changed
in-between. Especially if we want to allow unit unloading.
2. We want GHC to support several independent sessions at once, hence
several UnitState. The current approach supposes there is a unique
UnitState as a UnitId doesn't indicate which UnitState to use.
See the Note [Pretty-printing UnitId] in GHC.Unit for the new approach
implemented by this patch.
One step closer to remove `sdocDynFlags` field from `SDocContext`
(#10143).
Fix #18124.
Also fix some Backpack code to use SDoc instead of String.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc476a5040cdc64c177de0f78edaafec0972cff4">dc476a50</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-26T04:51:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix BigNat subtraction (#18604)
There was a confusion between the boolean expected by
withNewWordArrayTrimedMaybe and the boolean returned by subtracting
functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fcb10b6c69e388d8c6e777baf39920e2cc694501">fcb10b6c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-08-26T10:42:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC and X86: Portable printing of IEEE floats
GNU as and the AIX assembler support floating point literals.
SPARC seems to have support too but I cannot test on SPARC.
Curiously, `doubleToBytes` is also used in the LLVM backend.
To avoid endianness issues when cross-compiling float and double literals
are printed as C-style floating point values. The assembler then takes
care of memory layout and endianness.
This was brought up in #18431 by @hsyl20.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/770100e0266750a313b34a52a60968410fcf0769">770100e0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-26T10:43:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">primops: Remove Monadic and Dyadic categories
There were four categories of primops: Monadic, Dyadic, Compare, GenPrimOp.
The compiler does not treat Monadic and Dyadic in any special way,
we can just replace them with GenPrimOp.
Compare is still used in isComparisonPrimOp.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01ff8c89727a91cbc1571ae54f73f5919d6aaa71">01ff8c89</a></strong>
<div>
<span>by Aditya Gupta</span>
<i>at 2020-08-27T14:19:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Consolidate imports in getMinimalImports (#18264)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bacccb73c9b080c3c01a5e55ecb0a00cd8a77e55">bacccb73</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-27T14:20:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make {hsExpr,hsType,pat}NeedsParens aware of boxed 1-tuples
`hsExprNeedsParens`, `hsTypeNeedsParens`, and `patNeedsParens`
previously assumed that all uses of explicit tuples in the source
syntax never need to be parenthesized. This is true save for one
exception: boxed one-tuples, which use the `Solo` data type from
`GHC.Tuple` instead of special tuple syntax. This patch adds the
necessary logic to the three `*NeedsParens` functions to handle
`Solo` correctly.
Fixes #18612.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6f50cea42a9ffc947bf4243986663cc820b0ec8">c6f50cea</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-28T02:22:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing primop documentation (#18454)
- Add three pseudoops to primops.txt.pp, so that Haddock renders
the documentation
- Update comments
- Remove special case for "->" - it's no longer exported from GHC.Prim
- Remove reference to Note [Compiling GHC.Prim] - the ad-hoc fix is no
longer there after updates to levity polymorphism.
- Document GHC.Prim
- Remove the comment that lazy is levity-polymorphic.
As far as I can tell, it never was: in 80e399639,
only the unfolding was given an open type variable.
- Remove haddock hack in GHC.Magic - no longer neccessary after
adding realWorld# to primops.txt.pp.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f065b6b012fb8f73689bc5c2a4904d5e6e377af8">f065b6b0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix use distro toolchian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4517a38215eb72a4824c72d97377b9325059bf55">4517a382</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">document how build system find toolchains on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/329f7cb958551f5b384e2765a823770150152da2">329f7cb9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T22:59:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Better error message on invalid getSystemTimerManager call
Previously we would produce a rather unhelpful pattern match failure
error in the case where the user called `getSystemTimerManager` in a
program which isn't built with `-threaded`. This understandably confused
the user in #15616.
Fixes #15616.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6d70a8ff6a6cd628738fec902fc984936105264">f6d70a8f</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T22:59:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #15617.
Avoid a similar regression in the future.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5969fd06ad4b4c31a8bdce51d35f9aa05594b49">e5969fd0</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T23:00:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional tests for #18172 (Followup MR 3543)
There was still one active discussion [thread](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3543#note_284325) when MR !3543 got merged.
This MR adds the requested tests exercising the changes in
`compiler/GHC/HsToCore/Match/Literal.hs:warnAboutEmptyEnumerations` and its sub-functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe18b4825c3289089a65b7b16b25e9d216a5b0fd">fe18b482</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T23:01:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Win32 and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2da933084b766fc424b11f5b671574d4c7317134">2da93308</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:01:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix slow-validate flavour (#18586)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e13008fb9a319c0b79db7c626f37bf20731beb">85e13008</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update dominator code with fixes from the dom-lt package.
Two bugs turned out in the package that have been fixed since.
This MR includes this fixes in the GHC port of the code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dffb38fab00ac1cd1cbc75156abcf373976581f7">dffb38fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Dominators.hs: Use unix line endings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6189cc04ca6c3d79126744e988b487f75ccef9e2">6189cc04</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:02:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[fixup 3433] move debugBelch into IF_DEBUG(linker)
The commit in dff1cb3d9c111808fec60190747272b973547c52 incorrectly left
the `debugBelch` function without a comment or IF_DEBUG(linker,)
decoration. This rectifies it.
Needs at least a 8.10 backport, as it was backported in 6471cc6aff80d5deebbdb1bf7b677b31ed2af3d5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb68a3f7f85b9fdef6f4845e608d086b01e6a58">bcb68a3f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:03:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't store HomeUnit in UnitConfig
Allow the creation of a UnitConfig (hence of a UnitState) without having
a HomeUnit. It's required for #14335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a3723876c6c79a0a407d50f4baa2818a13f232e">0a372387</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:04:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation and fix "check" bignum backend (#18604)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb85f125a227f6b5703d4a2e997c5ea320dfa31f">eb85f125</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:04:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set the dynamic-system-linker flag to Manual
This flag should be user controllable, hence Manual: True.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380ef84587fb6890d100c338d1992a6994a4f02a">380ef845</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-08-31T23:05:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ignore more files
Ignore files from "new style" cabal builds (dist-newstyle folders) and
from clangd (C language server).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74a7fbff5a8f244cd44345bf987e26413bb1989e">74a7fbff</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.0 and earlier (#18620)
This patch adds the upper bound of a happy version for ghc-9.0
and earlier.
Currently, we can't use happy-1.20.0 for ghc-9.0.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4473f02ae2e685601e257b8668bea2ec721b294">a4473f02</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.2 (#18620)
This patch adds the upper bound of a happy version for ghc-9.2.
Currently, We can use happy-1.19 or happy-1.20 for ghc-9.2.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8a2568b7b64e5b9fca5b12df7da759de4db39ae">a8a2568b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:06:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add BigNat compat functions (#18613)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/884245dd29265b7bee12cda8c915da9c916251ce">884245dd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-01T12:39:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix FastString lexicographic ordering (fix #18562)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b4fbc58d37d37457144014ef82bdd928de175df">4b4fbc58</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-01T12:39:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove "Ord FastString" instance
FastStrings can be compared in 2 ways: by Unique or lexically. We don't
want to bless one particular way with an "Ord" instance because it leads
to bugs (#18562) or to suboptimal code (e.g. using lexical comparison
while a Unique comparison would suffice).
UTF-8 encoding has the advantage that sorting strings by their encoded
bytes also sorts them by their Unicode code points, without having to
decode the actual code points. BUT GHC uses Modified UTF-8 which
diverges from UTF-8 by encoding \0 as 0xC080 instead of 0x00 (to avoid
null bytes in the middle of a String so that the string can still be
null-terminated). This patch adds a new `utf8CompareShortByteString`
function that performs sorting by bytes but that also takes Modified
UTF-8 into account. It is much more performant than decoding the strings
into [Char] to perform comparisons (which we did in the previous patch).
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4edcde70160820dd23c53d9019f895930e2c0e7">b4edcde7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-01T14:53:42-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add broken test for #18302
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Names/TH.hs
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compiler/GHC/Builtin/PrimOps.hs
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compiler/GHC/Builtin/RebindableNames.hs
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Types.hs-boot
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compiler/GHC/Builtin/Types/Literals.hs
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compiler/GHC/Builtin/Types/Prim.hs
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compiler/GHC/Builtin/Uniques.hs
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compiler/GHC/Builtin/Uniques.hs-boot
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compiler/GHC/Builtin/Utils.hs
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