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<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Andreas Klebinger pushed to branch wip/andreask/opt-bindersof
at <a href="https://gitlab.haskell.org/ghc/ghc" style="color: #1068bf;">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
Commits:
</h4>
<ul>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6ea8356b721ea4c3b871a796c1b2b13f94fd471" style="color: #1068bf;">d6ea8356</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-09-15T10:12:41+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Tag inference: Fix #21954 by retaining tagsigs of vars in function position.
For an expression like:
case x of y
Con z -> z
If we also retain the tag sig for z we can generate code to immediately return
it rather than calling out to stg_ap_0_fast.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cce70073f5017cf5514f92a900c76e47a4292a5" style="color: #1068bf;">7cce7007</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-09-15T10:12:42+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Stg.InferTags.Rewrite - Avoid some thunks.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88c4cbdb7c2f241368c72e05ae295e19ba7c254b" style="color: #1068bf;">88c4cbdb</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-16T13:57:56-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>hadrian: enable -fprof-late only for profiling ways
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7235831724dffdc203b8d87bb4d376546eeb883" style="color: #1068bf;">d7235831</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-16T13:57:56-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>hadrian: add late_ccs flavour transformer
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce203753a88406cba95278506bba1b4e6ef169c6" style="color: #1068bf;">ce203753</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-16T13:58:34-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>configure: remove unused program checks
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b4c1056580df029865346ffcf1aa2fca85cdddc" style="color: #1068bf;">9b4c1056</a></strong>
<div>
<span>by Pierre Le Marre</span>
<i>at 2022-09-16T13:59:16-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Update to Unicode 15.0
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6e9b89a8ad9bd155748fe177a23c8f4919d308f" style="color: #1068bf;">c6e9b89a</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-09-16T13:59:55-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Avoid partial head and tail in ghc-heap; replace with total pattern-matching
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/616afde3e2c6b733c8a44205a140ec8586853d3c" style="color: #1068bf;">616afde3</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-16T14:00:33-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>hadrian: relax Cabal upper bound to allow building with Cabal-3.8
A follow up of !8910.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df35d99465d1037b31cbd05aa3380fce6031af73" style="color: #1068bf;">df35d994</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2022-09-16T14:01:11-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add links to the continuations haddocks in the docs for each primop
fixes #22176
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/383f75494a936bbc2f794a788141b103cd482913" style="color: #1068bf;">383f7549</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-09-16T21:42:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>-Wunused-pattern-binds: Recurse into patterns to check whether there's a splice
See the examples in #22057 which show we have to traverse deeply into a
pattern to determine whether it contains a splice or not. The original
implementation pointed this out but deemed this very shallow traversal
"too expensive".
Fixes #22057
I also fixed an oversight in !7821 which meant we lost a warning which
was present in 9.2.2.
Fixes #22067
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5031bf49793f3470a9fd9036829a08e556584d8a" style="color: #1068bf;">5031bf49</a></strong>
<div>
<span>by sheaf</span>
<i>at 2022-09-16T21:42:49-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Hadrian: Don't try to build terminfo on Windows
Commit b42cedbe introduced a dependency on terminfo on Windows,
but that package isn't available on Windows.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9afe2216ccabd36e3083ec3b508310fcdb5eae3" style="color: #1068bf;">c9afe221</a></strong>
<div>
<span>by M Farkas-Dyck</span>
<i>at 2022-09-17T06:44:47-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Clean up some. In particular:
• Delete some dead code, largely under `GHC.Utils`.
• Clean up a few definitions in `GHC.Utils.(Misc, Monad)`.
• Clean up `GHC.Types.SrcLoc`.
• Derive stock `Functor, Foldable, Traversable` for more types.
• Derive more instances for newtypes.
Bump haddock submodule.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85431ac363e77dd0f93d46ff1ed450b4833c2a40" style="color: #1068bf;">85431ac3</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-17T06:45:25-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>driver: pass original Cmm filename in ModLocation
When compiling Cmm, the ml_hs_file field is used to indicate Cmm
filename when later generating DWARF information. We should pass the
original filename here, otherwise for preprocessed Cmm files, the
filename will be a temporary filename which is confusing.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63aa006939a8b5284b0f6f6a1c26d52aa3ae47da" style="color: #1068bf;">63aa0069</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-17T06:46:04-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: remove legacy logging cabal flag
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd0f418422a3ace8d05c8ce93850190e57321465" style="color: #1068bf;">bd0f4184</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-17T06:46:04-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: make threaded ways optional
For certain targets (e.g. wasm32-wasi), the threaded rts is known not to
work. This patch adds a "threaded" cabal flag to rts to make threaded
rts ways optional. Hadrian enables this flag iff the flavour rtsWays
contains threaded ways.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a666ad2a89a8ad2aa24a6406b88f516afaec671" style="color: #1068bf;">8a666ad2</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2022-09-18T08:00:44-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>DeriveFunctor: Check for last type variables using dataConUnivTyVars
Previously, derived instances of `Functor` (as well as the related classes
`Foldable`, `Traversable`, and `Generic1`) would determine which constraints to
infer by checking for fields that contain the last type variable. The problem
was that this last type variable was taken from `tyConTyVars`. For GADTs, the
type variables in each data constructor are _not_ the same type variables as
in `tyConTyVars`, leading to #22167.
This fixes the issue by instead checking for the last type variable using
`dataConUnivTyVars`. (This is very similar in spirit to the fix for #21185,
which also replaced an errant use of `tyConTyVars` with type variables from
each data constructor.)
Fixes #22167.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/780371678fae6cc4ab08a029f5cc35c73de2dc4b" style="color: #1068bf;">78037167</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2022-09-18T08:01:20-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Lexer: pass updated buffer to actions (#22201)
In the lexer, predicates have the following type:
{ ... } :: user -- predicate state
-> AlexInput -- input stream before the token
-> Int -- length of the token
-> AlexInput -- input stream after the token
-> Bool -- True <=> accept the token
This is documented in the Alex manual.
There is access to the input stream both before and after the token.
But when the time comes to construct the token, GHC passes only the
initial string buffer to the lexer action. This patch fixes it:
- type Action = PsSpan -> StringBuffer -> Int -> P (PsLocated Token)
+ type Action = PsSpan -> StringBuffer -> Int -> StringBuffer -> P (PsLocated Token)
Now lexer actions have access to the string buffer both before and after
the token, just like the predicates. It's just a matter of passing an
additional function parameter throughout the lexer.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7574659452a864e762fa812cb38cf15f70d85617" style="color: #1068bf;">75746594</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2022-09-18T08:01:20-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Lexer: define varsym without predicates (#22201)
Before this patch, the varsym lexing rules were defined as follows:
<0> {
@varsym / { precededByClosingToken `alexAndPred` followedByOpeningToken } { varsym_tight_infix }
@varsym / { followedByOpeningToken } { varsym_prefix }
@varsym / { precededByClosingToken } { varsym_suffix }
@varsym { varsym_loose_infix }
}
Unfortunately, this meant that the predicates 'precededByClosingToken' and
'followedByOpeningToken' were recomputed several times before we could figure
out the whitespace context.
With this patch, we check for whitespace context directly in the lexer
action:
<0> {
@varsym { with_op_ws varsym }
}
The checking for opening/closing tokens happens in 'with_op_ws' now,
which is part of the lexer action rather than the lexer predicate.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f81b38625a5fea7fb8160a3a62ae6be078a7b1" style="color: #1068bf;">c1f81b38</a></strong>
<div>
<span>by M Farkas-Dyck</span>
<i>at 2022-09-19T09:07:05-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Scrub partiality about `NewOrData`.
Rather than a list of constructors and a `NewOrData` flag, we define `data DataDefnCons a = NewTypeCon a | DataTypeCons [a]`, which enforces a newtype to have exactly one constructor.
Closes #22070.
Bump haddock submodule.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e1ed8c5224a2a2d8ccf502da08a24ce71fd5ac6" style="color: #1068bf;">1e1ed8c5</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-09-19T09:07:43-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>CmmToC: emit __builtin_unreachable() after noreturn ccalls
Emit a __builtin_unreachable() call after a foreign call marked as
CmmNeverReturns. This is crucial to generate correctly typed code for
wasm; as for other archs, this is also beneficial for the C compiler
optimizations.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19f45a25f4b14fff081d75f506e7992c81371fc5" style="color: #1068bf;">19f45a25</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2022-09-20T03:49:29-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Document :unadd GHCi command in user guide
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/545ff490144ed3ddd596d2a0c01b0a16b5528f63" style="color: #1068bf;">545ff490</a></strong>
<div>
<span>by sheaf</span>
<i>at 2022-09-20T03:50:06-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Hadrian: merge archives even in stage 0
We now always merge .a archives when ar supports -L.
This change is necessary in order to bootstrap GHC using GHC 9.4
on Windows, as nested archives aren't supported.
Not doing so triggered bug #21990 when trying to use the Win32
package, with errors such as:
Not a x86_64 PE+ file.
Unknown COFF 4 type in getHeaderInfo.
ld.lld: error: undefined symbol: Win32zm2zi12zi0zi0_SystemziWin32ziConsoleziCtrlHandler_withConsoleCtrlHandler1_info
We have to be careful about which ar is meant: in stage 0, the check
should be done on the system ar (system-ar in system.config).
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59fe128c37b2befb1ece4bf3f8f5c9082bd213eb" style="color: #1068bf;">59fe128c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2022-09-20T03:50:42-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Fix -Woperator-whitespace for consym (part of #19372)
Due to an oversight, the initial specification and implementation of
-Woperator-whitespace focused on varsym exclusively and completely
ignored consym.
This meant that expressions such as "x+ y" would produce a warning,
while "x:+ y" would not.
The specification was corrected in ghc-proposals pull request #404,
and this patch updates the implementation accordingly.
Regression test included.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4c2cca012c139259ab40e5b2e5f43aafc8f49c0" style="color: #1068bf;">c4c2cca0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2022-09-20T13:11:49-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add `Eq` and `Ord` instances for `Generically1`
These are needed so the subsequent commit overhauling the `*1` classes
type-checks.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7beb356e944bf3415394fd6aeb7841aca5759020" style="color: #1068bf;">7beb356e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2022-09-20T13:11:50-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Relax instances for Functor combinators; put superclass on Class1 and Class2 to make non-breaking
This change is approved by the Core Libraries commitee in
https://github.com/haskell/core-libraries-committee/issues/10
The first change makes the `Eq`, `Ord`, `Show`, and `Read` instances for
`Sum`, `Product`, and `Compose` match those for `:+:`, `:*:`, and `:.:`.
These have the proper flexible contexts that are exactly what the
instance needs:
For example, instead of
```haskell
instance (Eq1 f, Eq1 g, Eq a) => Eq (Compose f g a) where
(==) = eq1
```
we do
```haskell
deriving instance Eq (f (g a)) => Eq (Compose f g a)
```
But, that change alone is rather breaking, because until now `Eq (f a)`
and `Eq1 f` (and respectively the other classes and their `*1`
equivalents too) are *incomparable* constraints. This has always been an
annoyance of working with the `*1` classes, and now it would rear it's
head one last time as an pesky migration.
Instead, we give the `*1` classes superclasses, like so:
```haskell
(forall a. Eq a => Eq (f a)) => Eq1 f
```
along with some laws that canonicity is preserved, like:
```haskell
liftEq (==) = (==)
```
and likewise for `*2` classes:
```haskell
(forall a. Eq a => Eq1 (f a)) => Eq2 f
```
and laws:
```haskell
liftEq2 (==) = liftEq1
```
The `*1` classes also have default methods using the `*2` classes where
possible.
What this means, as explained in the docs, is that `*1` classes really
are generations of the regular classes, indicating that the methods can
be split into a canonical lifting combined with a canonical inner, with
the super class "witnessing" the laws[1] in a fashion.
Circling back to the pragmatics of migrating, note that the superclass
means evidence for the old `Sum`, `Product`, and `Compose` instances is
(more than) sufficient, so breakage is less likely --- as long no
instances are "missing", existing polymorphic code will continue to
work.
Breakage can occur when a datatype implements the `*1` class but not the
corresponding regular class, but this is almost certainly an oversight.
For example, containers made that mistake for `Tree` and `Ord`, which I
fixed in https://github.com/haskell/containers/pull/761, but fixing the
issue by adding `Ord1` was extremely *un*controversial.
`Generically1` was also missing `Eq`, `Ord`, `Read,` and `Show`
instances. It is unlikely this would have been caught without
implementing this change.
-----
[1]: In fact, someday, when the laws are part of the language and not
only documentation, we might be able to drop the superclass field of the
dictionary by using the laws to recover the superclass in an
instance-agnostic manner, e.g. with a *non*-overloaded function with
type:
```haskell
DictEq1 f -> DictEq a -> DictEq (f a)
```
But I don't wish to get into optomizations now, just demonstrate the
close relationship between the law and the superclass.
Bump haddock submodule because of test output changing.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a8c6b5ede0345bf0bb1b34d93fe7dc759b99bfd" style="color: #1068bf;">6a8c6b5e</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2022-09-20T13:12:27-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add notes to ghc-prim Haddocks that users should not import it
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee9d0f5c5680ae033d701dfbd220c7938c7a2d51" style="color: #1068bf;">ee9d0f5c</a></strong>
<div>
<span>by matoro</span>
<i>at 2022-09-20T13:13:06-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>docs: clarify that LLVM codegen is not available in unregisterised mode
The current docs are misleading and suggest that it is possible to use
LLVM codegen from an unregisterised build. This is not the case;
attempting to pass `-fllvm` to an unregisterised build warns:
```
when making flags consistent: warning:
Target platform uses unregisterised ABI, so compiling via C
```
and uses the C codegen anyway.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/854224ed32422f7a315a2480c129691ad40ca504" style="color: #1068bf;">854224ed</a></strong>
<div>
<span>by Nicolas Trangez</span>
<i>at 2022-09-20T20:14:29-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: remove copy-paste error from `cabal.rts.in`
This was, likely accidentally, introduced in 4bf542bf1c.
See: 4bf542bf1cdf2fa468457fc0af21333478293476
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8ae3add11969b5128f34d02a5582c1f007cce5c" style="color: #1068bf;">c8ae3add</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-09-20T20:15:04-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>hadrian: Add extra_dependencies edges for all different ways
The hack to add extra dependencies needed by DeriveLift extension missed
the cases for profiles and dynamic ways. For the profiled way this leads
to errors like:
```
GHC error in desugarer lookup in Data.IntSet.Internal:
Failed to load interface for ‘Language.Haskell.TH.Lib.Internal’
Perhaps you haven't installed the profiling libraries for package ‘template-haskell’?
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
ghc: panic! (the 'impossible' happened)
GHC version 9.5.20220916:
initDs
```
Therefore the fix is to add these extra edges in.
Fixes #22197
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a971657d5c4e919a8d446386374e5ed491e9f6b9" style="color: #1068bf;">a971657d</a></strong>
<div>
<span>by Mon Aaraj</span>
<i>at 2022-09-21T06:41:24+03:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>users-guide: fix incorrect ghcappdata folder for unix and windows
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06ccad0de07026ea8128a9951f608bcc67ef23d8" style="color: #1068bf;">06ccad0d</a></strong>
<div>
<span>by sheaf</span>
<i>at 2022-09-21T08:28:49-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Don't use isUnliftedType in isTagged
The function GHC.Stg.InferTags.Rewrite.isTagged can be given
the Id of a join point, which might be representation polymorphic.
This would cause the call to isUnliftedType to crash. It's better
to use typeLevity_maybe instead.
Fixes #22212
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0ba775dda6ddec1251363d1b73f4f3e35931dd9" style="color: #1068bf;">c0ba775d</a></strong>
<div>
<span>by Teo Camarasu</span>
<i>at 2022-09-21T14:30:37-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add fragmentation statistic to GHC.Stats
Implements #21537
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2463df2fe21b5b37ecada3df8c6726c534d24590" style="color: #1068bf;">2463df2f</a></strong>
<div>
<span>by Torsten Schmits</span>
<i>at 2022-09-21T14:31:24-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Rename Solo[constructor] to MkSolo
Part of proposal 475 (https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0475-tuple-syntax.rst)
Moves all tuples to GHC.Tuple.Prim
Updates ghc-prim version (and bumps bounds in dependents)
updates haddock submodule
updates deepseq submodule
updates text submodule
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9034fadaf641c3821db6e066faaf1a62ed236c13" style="color: #1068bf;">9034fada</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-09-22T09:25:29-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Update filepath to filepath-1.4.100.0
Updates submodule
* Always rely on vendored filepath
* filepath must be built as stage0 dependency because it uses
template-haskell.
Towards #22098
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/615e22789a04e74d7e02239b4580b95b077c3ae0" style="color: #1068bf;">615e2278</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2022-09-22T09:26:05-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Minor refactor around Outputable
* Replace 'text . show' and 'ppr' with 'int'.
* Remove Outputable.hs-boot, no longer needed
* Use pprWithCommas
* Factor out instructions in AArch64 codegen
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aeafdba5503b8d26a62dc7bc7078caef170d4154" style="color: #1068bf;">aeafdba5</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2022-09-27T15:14:54+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Demand: Clear distinction between Call SubDmd and eval Dmd (#21717)
In #21717 we saw a reportedly unsound strictness signature due to an unsound
definition of plusSubDmd on Calls. This patch contains a description and the fix
to the unsoundness as outlined in `Note [Call SubDemand vs. evaluation Demand]`.
This fix means we also get rid of the special handling of `-fpedantic-bottoms`
in eta-reduction. Thanks to less strict and actually sound strictness results,
we will no longer eta-reduce the problematic cases in the first place, even
without `-fpedantic-bottoms`.
So fixing the unsoundness also makes our eta-reduction code simpler with less
hacks to explain. But there is another, more unfortunate side-effect:
We *unfix* #21085, but fortunately we have a new fix ready:
See `Note [mkCall and plusSubDmd]`.
There's another change:
I decided to make `Note [SubDemand denotes at least one evaluation]` a lot
simpler by using `plusSubDmd` (instead of `lubPlusSubDmd`) even if both argument
demands are lazy. That leads to less precise results, but in turn rids ourselves
from the need for 4 different `OpMode`s and the complication of
`Note [Manual specialisation of lub*Dmd/plus*Dmd]`. The result is simpler code
that is in line with the paper draft on Demand Analysis.
I left the abandoned idea in `Note [Unrealised opportunity in plusDmd]` for
posterity. The fallout in terms of regressions is negligible, as the testsuite
and NoFib shows.
```
Program Allocs Instrs
--------------------------------------------------------------------------------
hidden +0.2% -0.2%
linear -0.0% -0.7%
--------------------------------------------------------------------------------
Min -0.0% -0.7%
Max +0.2% +0.0%
Geometric Mean +0.0% -0.0%
```
Fixes #21717.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b1595c87f0c2406bb340c5e27a4a45dfcde0e2c" style="color: #1068bf;">9b1595c8</a></strong>
<div>
<span>by Ross Paterson</span>
<i>at 2022-09-27T14:12:01-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>implement proposal 106 (Define Kinds Without Promotion) (fixes #6024)
includes corresponding changes to haddock submodule
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2d73cb47562a86da76dae217d15f0dbd2b05b0e" style="color: #1068bf;">c2d73cb4</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-09-28T15:07:30-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Apply some tricks to speed up core lint.
Below are the noteworthy changes and if given their impact on compiler
allocations for a type heavy module:
* Use the oneShot trick on LintM
* Use a unboxed tuple for the result of LintM: ~6% reduction
* Avoid a thunk for the result of typeKind in lintType: ~5% reduction
* lint_app: Don't allocate the error msg in the hot code path: ~4%
reduction
* lint_app: Eagerly force the in scope set: ~4%
* nonDetCmpType: Try to short cut using reallyUnsafePtrEquality#: ~2%
* lintM: Use a unboxed maybe for the `a` result: ~12%
* lint_app: make go_app tail recursive to avoid allocating the go function
as heap closure: ~7%
* expandSynTyCon_maybe: Use a specialized data type
For a less type heavy module like nofib/spectral/simple compiled with
-O -dcore-lint allocations went down by ~24% and compile time by ~9%.
-------------------------
Metric Decrease:
T1969
-------------------------
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b74b6191d7c442dffdfc9a9e2a6d476d7b3a28f2" style="color: #1068bf;">b74b6191</a></strong>
<div>
<span>by sheaf</span>
<i>at 2022-09-28T15:08:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>matchLocalInst: do domination analysis
When multiple Given quantified constraints match a Wanted, and there is
a quantified constraint that dominates all others, we now pick it
to solve the Wanted.
See Note [Use only the best matching quantified constraint].
For example:
[G] d1: forall a b. ( Eq a, Num b, C a b ) => D a b
[G] d2: forall a . C a Int => D a Int
[W] {w}: D a Int
When solving the Wanted, we find that both Givens match, but we pick
the second, because it has a weaker precondition, C a Int, compared
to (Eq a, Num Int, C a Int). We thus say that d2 dominates d1;
see Note [When does a quantified instance dominate another?].
This domination test is done purely in terms of superclass expansion,
in the function GHC.Tc.Solver.Interact.impliedBySCs. We don't attempt
to do a full round of constraint solving; this simple check suffices
for now.
Fixes #22216 and #22223
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a53ac1877bbd29de432c0aca442904e9da96c4e" style="color: #1068bf;">2a53ac18</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-09-28T17:49:09-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Improve aggressive specialisation
This patch fixes #21286, by not unboxing dictionaries in
worker/wrapper (ever). The main payload is tiny:
* In `GHC.Core.Opt.DmdAnal.finaliseArgBoxities`, do not unbox
dictionaries in `get_dmd`. See Note [Do not unbox class dictionaries]
in that module
* I also found that imported wrappers were being fruitlessly
specialised, so I fixed that too, in canSpecImport.
See Note [Specialising imported functions] point (2).
In doing due diligence in the testsuite I fixed a number of
other things:
* Improve Note [Specialising unfoldings] in GHC.Core.Unfold.Make,
and Note [Inline specialisations] in GHC.Core.Opt.Specialise,
and remove duplication between the two. The new Note describes
how we specialise functions with an INLINABLE pragma.
And simplify the defn of `spec_unf` in `GHC.Core.Opt.Specialise.specCalls`.
* Improve Note [Worker/wrapper for INLINABLE functions] in
GHC.Core.Opt.WorkWrap.
And (critially) make an actual change which is to propagate the
user-written pragma from the original function to the wrapper; see
`mkStrWrapperInlinePrag`.
* Write new Note [Specialising imported functions] in
GHC.Core.Opt.Specialise
All this has a big effect on some compile times. This is
compiler/perf, showing only changes over 1%:
Metrics: compile_time/bytes allocated
-------------------------------------
LargeRecord(normal) -50.2% GOOD
ManyConstructors(normal) +1.0%
MultiLayerModulesTH_OneShot(normal) +2.6%
PmSeriesG(normal) -1.1%
T10547(normal) -1.2%
T11195(normal) -1.2%
T11276(normal) -1.0%
T11303b(normal) -1.6%
T11545(normal) -1.4%
T11822(normal) -1.3%
T12150(optasm) -1.0%
T12234(optasm) -1.2%
T13056(optasm) -9.3% GOOD
T13253(normal) -3.8% GOOD
T15164(normal) -3.6% GOOD
T16190(normal) -2.1%
T16577(normal) -2.8% GOOD
T16875(normal) -1.6%
T17836(normal) +2.2%
T17977b(normal) -1.0%
T18223(normal) -33.3% GOOD
T18282(normal) -3.4% GOOD
T18304(normal) -1.4%
T18698a(normal) -1.4% GOOD
T18698b(normal) -1.3% GOOD
T19695(normal) -2.5% GOOD
T5837(normal) -2.3%
T9630(normal) -33.0% GOOD
WWRec(normal) -9.7% GOOD
hard_hole_fits(normal) -2.1% GOOD
hie002(normal) +1.6%
geo. mean -2.2%
minimum -50.2%
maximum +2.6%
I diligently investigated some of the big drops.
* Caused by not doing w/w for dictionaries:
T13056, T15164, WWRec, T18223
* Caused by not fruitlessly specialising wrappers
LargeRecord, T9630
For runtimes, here is perf/should+_run:
Metrics: runtime/bytes allocated
--------------------------------
T12990(normal) -3.8%
T5205(normal) -1.3%
T9203(normal) -10.7% GOOD
haddock.Cabal(normal) +0.1%
haddock.base(normal) -1.1%
haddock.compiler(normal) -0.3%
lazy-bs-alloc(normal) -0.2%
------------------------------------------
geo. mean -0.3%
minimum -10.7%
maximum +0.1%
I did not investigate exactly what happens in T9203.
Nofib is a wash:
+-------------------------------++--+-----------+-----------+
| || | tsv (rel) | std. err. |
+===============================++==+===========+===========+
| real/anna || | -0.13% | 0.0% |
| real/fem || | +0.13% | 0.0% |
| real/fulsom || | -0.16% | 0.0% |
| real/lift || | -1.55% | 0.0% |
| real/reptile || | -0.11% | 0.0% |
| real/smallpt || | +0.51% | 0.0% |
| spectral/constraints || | +0.20% | 0.0% |
| spectral/dom-lt || | +1.80% | 0.0% |
| spectral/expert || | +0.33% | 0.0% |
+===============================++==+===========+===========+
| geom mean || | | |
+-------------------------------++--+-----------+-----------+
I spent quite some time investigating dom-lt, but it's pretty
complicated. See my note on !7847. Conclusion: it's just a delicate
inlining interaction, and we have plenty of those.
Metric Decrease:
LargeRecord
T13056
T13253
T15164
T16577
T18223
T18282
T18698a
T18698b
T19695
T9630
WWRec
hard_hole_fits
T9203
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/addeefc054b64286dfc231d394885bfdecfd261d" style="color: #1068bf;">addeefc0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-09-28T17:49:09-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Refactor UnfoldingSource and IfaceUnfolding
I finally got tired of the way that IfaceUnfolding reflected
a previous structure of unfoldings, not the current one. This
MR refactors UnfoldingSource and IfaceUnfolding to be simpler
and more consistent.
It's largely just a refactor, but in UnfoldingSource (which moves
to GHC.Types.Basic, since it is now used in IfaceSyn too), I
distinguish between /user-specified/ and /system-generated/ stable
unfoldings.
data UnfoldingSource
= VanillaSrc
| StableUserSrc -- From a user-specified pragma
| StableSystemSrc -- From a system-generated unfolding
| CompulsorySrc
This has a minor effect in CSE (see the use of isisStableUserUnfolding
in GHC.Core.Opt.CSE), which I tripped over when working on
specialisation, but it seems like a Good Thing to know anyway.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7be6f9a459b2fb0cdf7d1d26a373f7d4f89f7499" style="color: #1068bf;">7be6f9a4</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-09-28T17:49:09-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>INLINE/INLINEABLE pragmas in Foreign.Marshal.Array
Foreign.Marshal.Array contains many small functions, all of which are
overloaded, and which are critical for performance. Yet none of them
had pragmas, so it was a fluke whether or not they got inlined.
This patch makes them all either INLINE (small ones) or
INLINEABLE and hence specialisable (larger ones).
See Note [Specialising array operations] in that module.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0c89dfaf9f8aeda9dd69a9583fd29150099aa27" style="color: #1068bf;">b0c89dfa</a></strong>
<div>
<span>by Jade Lovelace</span>
<i>at 2022-09-28T17:49:49-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Export OnOff from GHC.Driver.Session
I was working on fixing an issue where HLS was trying to pass its
DynFlags to HLint, but didn't pass any of the disabled language
extensions, which HLint would then assume are on because of their
default values.
Currently it's not possible to get any of the "No" flags because the
`DynFlags.extensions` field can't really be used since it is [OnOff
Extension] and OnOff is not exported.
So let's export it.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f050687e75ffe6fbf140cacd15fd916d2997499" style="color: #1068bf;">2f050687</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-09-28T17:50:28-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Avoid Data.List.group; prefer Data.List.NonEmpty.group
This allows to avoid further partiality, e. g., map head . group is
replaced by map NE.head . NE.group, and there are less panic calls.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc0020fa0871aff23d26b0116c1d4e43b8a3e9a9" style="color: #1068bf;">bc0020fa</a></strong>
<div>
<span>by M Farkas-Dyck</span>
<i>at 2022-09-28T22:51:59-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Clean up `findWiredInUnit`. In particular, avoid `head`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a2eec98d9f5c3f5d735042f0d7bb65d0dbb3323" style="color: #1068bf;">6a2eec98</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-09-28T22:52:38-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Eliminate headFS, use unconsFS instead
A small step towards #22185 to avoid partial functions + safe implementation
of `startsWithUnderscore`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a535172d13b30c94766751d0bc21a494b8858ed" style="color: #1068bf;">5a535172</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2022-09-29T17:04:20+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Demand: Format Call SubDemands `Cn(sd)` as `C(n,sd)` (#22231)
Justification in #22231. Short form: In a demand like `1C1(C1(L))`
it was too easy to confuse which `1` belongs to which `C`. Now
that should be more obvious.
Fixes #22231
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea0083bf56b222579b586c8247031e04c80c15f1" style="color: #1068bf;">ea0083bf</a></strong>
<div>
<span>by Bryan Richter</span>
<i>at 2022-09-29T15:48:38-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Revert "ci: enable parallel compression for xz"
Combined wxth XZ_OPT=9, this blew the memory capacity of CI runners.
This reverts commit a5f9c35f5831ef5108e87813a96eac62803852ab.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5e8f493b015df859833beac5a8e64a0f9b9d4f4" style="color: #1068bf;">f5e8f493</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2022-09-30T18:42:13+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Boxity: Don't update Boxity unless worker/wrapper follows (#21754)
A small refactoring in our Core Opt pipeline and some new functions for
transfering argument boxities from one signature to another to facilitate
`Note [Don't change boxity without worker/wrapper]`.
Fixes #21754.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4baf7b1ceaef2d4f49e81e5786a855e22ed864bf" style="color: #1068bf;">4baf7b1c</a></strong>
<div>
<span>by M Farkas-Dyck</span>
<i>at 2022-09-30T17:45:47-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Scrub various partiality involving empty lists.
Avoids some uses of `head` and `tail`, and some panics when an argument is null.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95ead839fd39e0aa781dca9b1268b243c29ccaeb" style="color: #1068bf;">95ead839</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2022-10-01T00:37:43-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Fix a bug in continuation capture across multiple stack chunks
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2209665273135644f1b52470ea2cb53169f2ef91" style="color: #1068bf;">22096652</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-10-01T00:38:22-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Enforce internal invariant of OrdList and fix bugs in viewCons / viewSnoc
`viewCons` used to ignore `Many` constructor completely, returning `VNothing`.
`viewSnoc` violated internal invariant of `Many` being a non-empty list.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48ab9ca5abae82c45495c01e7634ff2a92979346" style="color: #1068bf;">48ab9ca5</a></strong>
<div>
<span>by Nicolas Trangez</span>
<i>at 2022-10-04T20:34:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>chore: extend `.editorconfig` for C files
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8df5c72185effbe2cca8d6038d2a356690c9d00" style="color: #1068bf;">b8df5c72</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2022-10-04T20:34:46-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Fix docs for pattern synonyms</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/463ffe0287eab354a438304111041ef82d2ed016" style="color: #1068bf;">463ffe02</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2022-10-04T20:35:24-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Use sameByteArray# in sameByteArray
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbe1e86ea5e793533898d6935a3b4e60afbd04a7" style="color: #1068bf;">fbe1e86e</a></strong>
<div>
<span>by Pierre Le Marre</span>
<i>at 2022-10-05T15:58:43+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Minor fixes following Unicode 15.0.0 update
- Fix changelog for Unicode 15.0.0
- Fix the checksums of the downloaded Unicode files, in base's tool: "ucd2haskell".
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a31d02e0b76ea0d279f5c6d74239e6aa45ef631" style="color: #1068bf;">8a31d02e</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-10-05T20:40:41-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: don't enforce aligned((8)) on 32-bit targets
We simply need to align to the word size for pointer tagging to work. On
32-bit targets, aligned((8)) is wasteful.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/532de36870ed9e880d5f146a478453701e9db25d" style="color: #1068bf;">532de368</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2022-10-06T07:45:46-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Export symbolSing, SSymbol, and friends (CLC#85)
This implements this Core Libraries Proposal:
https://github.com/haskell/core-libraries-committee/issues/85
In particular, it:
1. Exposes the `symbolSing` method of `KnownSymbol`,
2. Exports the abstract `SSymbol` type used in `symbolSing`, and
3. Defines an API for interacting with `SSymbol`.
This also makes corresponding changes for `natSing`/`KnownNat`/`SNat` and
`charSing`/`KnownChar`/`SChar`. This fixes #15183 and addresses part (2)
of #21568.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d83a92e6b3ac4609fe0e1159ced59f12dcf622bc" style="color: #1068bf;">d83a92e6</a></strong>
<div>
<span>by sheaf</span>
<i>at 2022-10-07T07:36:30-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Remove mention of make from README.md
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/945e8e491441c1efdab7c0e1bd2e04d0224a4ad5" style="color: #1068bf;">945e8e49</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-10-10T17:13:31-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add a newline before since pragma in Data.Array.Byte
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44fcdb04467c23b794a82451c64cbfaed6f4ef62" style="color: #1068bf;">44fcdb04</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2022-10-10T17:14:06-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Parser/PostProcess: rename failOp* functions
There are three functions named failOp* in the parser:
failOpNotEnabledImportQualifiedPost
failOpImportQualifiedTwice
failOpFewArgs
Only the last one has anything to do with operators. The other two
were named this way either by mistake or due to a misunderstanding of
what "op" stands for. This small patch corrects this.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96d32ff289f87b8c78f0a8d1b11295c9563ec020" style="color: #1068bf;">96d32ff2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-10-10T22:30:21+01:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Make rewrite rules "win" over inlining
If a rewrite rule and a rewrite rule compete in the simplifier, this
patch makes sure that the rewrite rule "win". That is, in general
a bit fragile, but it's a huge help when making specialisation work
reliably, as #21851 and #22097 showed.
The change is fairly straightforwad, and documented in
Note [Rewrite rules and inlining]
in GHC.Core.Opt.Simplify.Iteration.
Compile-times change, up and down a bit -- in some cases because
we get better specialisation. But the payoff (more reliable
specialisation) is large.
Metrics: compile_time/bytes allocated
-----------------------------------------------
T10421(normal) +3.7% BAD
T10421a(normal) +5.5%
T13253(normal) +1.3%
T14052(ghci) +1.8%
T15304(normal) -1.4%
T16577(normal) +3.1% BAD
T17516(normal) +2.3%
T17836(normal) -1.9%
T18223(normal) -1.8%
T8095(normal) -1.3%
T9961(normal) +2.5% BAD
geo. mean +0.0%
minimum -1.9%
maximum +5.5%
Nofib results are (bytes allocated)
+-------------------------------++----------+
| ||tsv (rel) |
+===============================++==========+
| imaginary/paraffins || +0.27% |
| imaginary/rfib || -0.04% |
| real/anna || +0.02% |
| real/fem || -0.04% |
| real/fluid || +1.68% |
| real/gamteb || -0.34% |
| real/gg || +1.54% |
| real/hidden || -0.01% |
| real/hpg || -0.03% |
| real/infer || -0.03% |
| real/prolog || +0.02% |
| real/veritas || -0.47% |
| shootout/fannkuch-redux || -0.03% |
| shootout/k-nucleotide || -0.02% |
| shootout/n-body || -0.06% |
| shootout/spectral-norm || -0.01% |
| spectral/cryptarithm2 || +1.25% |
| spectral/fibheaps || +18.33% |
| spectral/last-piece || -0.34% |
+===============================++==========+
| geom mean || +0.17% |
There are extensive notes in !8897 about the regressions.
Briefly
* fibheaps: there was a very delicately balanced inlining that
tipped over the wrong way after this change.
* cryptarithm2 and paraffins are caused by #22274, which is
a separate issue really. (I.e. the right fix is *not* to
make inlining "win" over rules.)
So I'm accepting these changes
Metric Increase:
T10421
T16577
T9961
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed4b5885bdac7b986655bb40f8c9ece2f8735c98" style="color: #1068bf;">ed4b5885</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2022-10-10T23:16:11-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Utils.JSON: do not escapeJsonString in ToJson String instance
as `escapeJsonString` is used in `renderJSON`, so the `JSString`
constructor is meant to carry the unescaped string.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbb887406d27b5271e45392c2c25f8b1ba4cdeae" style="color: #1068bf;">fbb88740</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-10-11T12:48:45-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Tidy implicit binds
We want to put implicit binds into fat interface files, so the easiest
thing to do seems to be to treat them uniformly with other binders.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e058b138fef9f697095f97cb6a52f6ba58c940c5" style="color: #1068bf;">e058b138</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-10-11T12:48:45-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Interface Files with Core Definitions
This commit adds three new flags
* -fwrite-if-simplified-core: Writes the whole core program into an interface
file
* -fbyte-code-and-object-code: Generate both byte code and object code
when compiling a file
* -fprefer-byte-code: Prefer to use byte-code if it's available when
running TH splices.
The goal for including the core bindings in an interface file is to be able to restart the compiler pipeline
at the point just after simplification and before code generation. Once compilation is
restarted then code can be created for the byte code backend.
This can significantly speed up
start-times for projects in GHCi. HLS already implements its own version of these extended interface
files for this reason.
Preferring to use byte-code means that we can avoid some potentially
expensive code generation steps (see #21700)
* Producing object code is much slower than producing bytecode, and normally you
need to compile with `-dynamic-too` to produce code in the static and dynamic way, the
dynamic way just for Template Haskell execution when using a dynamically linked compiler.
* Linking many large object files, which happens once per splice, can be quite
expensive compared to linking bytecode.
And you can get GHC to compile the necessary byte code so
`-fprefer-byte-code` has access to it by using
`-fbyte-code-and-object-code`.
Fixes #21067
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9789ea8e9f35d5c0674e10730c3435c4d3293f2b" style="color: #1068bf;">9789ea8e</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-10-11T12:48:45-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Teach -fno-code about -fprefer-byte-code
This patch teachs the code generation logic of -fno-code about
-fprefer-byte-code, so that if we need to generate code for a module
which prefers byte code, then we generate byte code rather than object
code.
We keep track separately which modules need object code and which byte
code and then enable the relevant code generation for each. Typically
the option will be enabled globally so one of these sets should be empty
and we will just turn on byte code or object code generation.
We also fix the bug where we would generate code for a module which
enables Template Haskell despite the fact it was unecessary.
Fixes #22016
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/caced75765472a1a94453f2e5a439dba0d04a265" style="color: #1068bf;">caced757</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-10-11T12:49:21-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Don't keep exit join points so much
We were religiously keeping exit join points throughout, which
had some bad effects (#21148, #22084).
This MR does two things:
* Arranges that exit join points are inhibited from inlining
only in /one/ Simplifier pass (right after Exitification).
See Note [Be selective about not-inlining exit join points]
in GHC.Core.Opt.Exitify
It's not a big deal, but it shaves 0.1% off compile times.
* Inline used-once non-recursive join points very aggressively
Given join j x = rhs in
joinrec k y = ....j x....
where this is the only occurrence of `j`, we want to inline `j`.
(Unless sm_keep_exits is on.)
See Note [Inline used-once non-recursive join points] in
GHC.Core.Opt.Simplify.Utils
This is just a tidy-up really. It doesn't change allocation, but
getting rid of a binding is always good.
Very effect on nofib -- some up and down.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/284cf387537110ce9139bf6ed0841c8f4f41db2a" style="color: #1068bf;">284cf387</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-10-11T12:49:21-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Make SpecConstr bale out less often
When doing performance debugging on #22084 / !8901, I found that the
algorithm in SpecConstr.decreaseSpecCount was so aggressive that if
there were /more/ specialisations available for an outer function,
that could more or less kill off specialisation for an /inner/
function. (An example was in nofib/spectral/fibheaps.)
This patch makes it a bit more aggressive, by dividing by 2, rather
than by the number of outer specialisations.
This makes the program bigger, temporarily:
T19695(normal) ghc/alloc +11.3% BAD
because we get more specialisation. But lots of other programs
compile a bit faster and the geometric mean in perf/compiler
is 0.0%.
Metric Increase:
T19695
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66af1399963a1872e520d1dbd1c94fd43e65082d" style="color: #1068bf;">66af1399</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-10-11T12:49:59-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>CmmToC: emit explicit tail calls when the C compiler supports it
Clang 13+ supports annotating a return statement using the musttail
attribute, which guarantees that it lowers to a tail call if compilation
succeeds.
This patch takes advantage of that feature for the unregisterised code
generator. The configure script tests availability of the musttail
attribute, if it's available, the Cmm tail calls will become C tail
calls that avoids the mini interpreter trampoline overhead. Nothing is
affected if the musttail attribute is not supported.
Clang documentation:
https://clang.llvm.org/docs/AttributeReference.html#musttail
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f0decd5063a853fc8f38a8944b2c91995cd5e48" style="color: #1068bf;">7f0decd5</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2022-10-11T12:50:40-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Don't include BufPos in interface files
Ticket #22162 pointed out that the build directory was leaking into the
ABI hash of a module because the BufPos depended on the location of the
build tree.
BufPos is only used in GHC.Parser.PostProcess.Haddock, and the
information doesn't need to be propagated outside the context of a
module.
Fixes #22162
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dce9f320ce7275fa97f49abef604abbc3b0f9a9c" style="color: #1068bf;">dce9f320</a></strong>
<div>
<span>by Cheng Shao</span>
<i>at 2022-10-11T12:51:19-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>CLabel: fix isInfoTableLabel
isInfoTableLabel does not take Cmm info table into account. This patch is required for data section layout of wasm32 NCG to work.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da679f2eda0f920afa522ce9c4b9ad50cdec7d74" style="color: #1068bf;">da679f2e</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-10-11T18:02:59-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Extend documentation for Data.List, mostly wrt infinite lists
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c099387ae82b7bf91232b714a3d35f429d6ffe3" style="color: #1068bf;">9c099387</a></strong>
<div>
<span>by jwaldmann</span>
<i>at 2022-10-11T18:02:59-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Expand comment for Data.List.permutations</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3863cb7418b77f3cd49c219f1f42f64efb2cc93" style="color: #1068bf;">d3863cb7</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-10-11T18:03:37-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>ByteArray# is unlifted, not unboxed
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6260e8b94ef531204351b79e0ca3ff8921d1b2f" style="color: #1068bf;">f6260e8b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: Add missing declaration of stg_noDuplicate
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69ccec2ce685fee3aeac66519645d568b169b592" style="color: #1068bf;">69ccec2c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>base: Move CString, CStringLen to GHC.Foreign
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6e8feb475cf421c408102c2abd531e380b67b00" style="color: #1068bf;">f6e8feb4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>base: Move IPE helpers to GHC.InfoProv
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/866c736ef29a07c6f3aa68063ef98ee0ecea12f3" style="color: #1068bf;">866c736e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: Refactor IPE tracing support
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b0d2022699d3d8b446d024ee837c0d07e2c1aa0" style="color: #1068bf;">6b0d2022</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Refactor IPE initialization
Here we refactor the representation of info table provenance information
in object code to significantly reduce its size and link-time impact.
Specifically, we deduplicate strings and represent them as 32-bit
offsets into a common string table.
In addition, we rework the registration logic to eliminate allocation
from the registration path, which is run from a static initializer where
things like allocation are technically undefined behavior (although it
did previously seem to work). For similar reasons we eliminate lock
usage from registration path, instead relying on atomic CAS.
Closes #22077.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b572d541d1d356d7836408ffa98a7b300d02174" style="color: #1068bf;">9b572d54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-11T23:45:10-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Separate IPE source file from span
The source file name can very often be shared across many IPE entries
whereas the source coordinates are generally unique. Separate the two to
exploit sharing of the former.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27978ceb649e929df29a94e98916c341169395af" style="color: #1068bf;">27978ceb</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2022-10-11T23:45:46-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Make Cmm Lint messages use dump style
Lint errors indicate an internal error in GHC, so it makes sense to use
it instead of the user style. This is consistent with Core Lint and STG Lint:
https://gitlab.haskell.org/ghc/ghc/-/blob/22096652/compiler/GHC/Core/Lint.hs#L429
https://gitlab.haskell.org/ghc/ghc/-/blob/22096652/compiler/GHC/Stg/Lint.hs#L144
Fixes #22218.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64a390d9c57b35edb6e7cf09b9324b43a3d08671" style="color: #1068bf;">64a390d9</a></strong>
<div>
<span>by Bryan Richter</span>
<i>at 2022-10-12T09:52:51+03:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Mark T7919 as fragile
On x86_64-linux, T7919 timed out ~30 times during July 2022.
And again ~30 times in September 2022.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/481467a5ceb07bb28bb6edb1569c86ff3cac315f" style="color: #1068bf;">481467a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-12T08:08:37-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: Don't hint inlining of appendToRunQueue
These hints have resulted in compile-time warnings due to failed
inlinings for quite some time. Moreover, it's quite unlikely that
inlining them is all that beneficial given that they are rather sizeable
functions.
Resolves #22280.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/819150893a9af7ee0770aba64b140bf1bc54957b" style="color: #1068bf;">81915089</a></strong>
<div>
<span>by Curran McConnell</span>
<i>at 2022-10-12T16:32:26-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>remove name shadowing
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/626652f7c172f307bd87afaee59c7f0e2825c55d" style="color: #1068bf;">626652f7</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2022-10-12T16:33:13-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>winio: do not re-translate input when handle is uncooked
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5172789a12dcca65574dc608364a7cbfdec2fe58" style="color: #1068bf;">5172789a</a></strong>
<div>
<span>by Charles Taylor</span>
<i>at 2022-10-12T16:33:57-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Unrestricted OverloadedLabels (#11671)
Implements GHC proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0170-unrestricted-overloadedlabels.rst
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce2939085e5b59513748ff73bc66161c09d69468" style="color: #1068bf;">ce293908</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-10-13T05:58:19-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add a perf test for the generics code pattern from #21839.
This code showed a strong shift between compile time (got worse) and
run time (got a lot better) recently which is perfectly acceptable.
However it wasn't clear why the compile time regression was happening
initially so I'm adding this test to make it easier to track such changes
in the future.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78ab7afe244a7617d600a6180d81d9dec657114d" style="color: #1068bf;">78ab7afe</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-13T05:58:56-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts/linker: Consolidate initializer/finalizer handling
Here we extend our treatment of initializer/finalizer priorities to
include ELF and in so doing refactor things to share the implementation
with PEi386. As well, I fix a subtle misconception of the ordering
behavior for `.ctors`.
Fixes #21847.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44692713c6fdfb1bf50a2480ca304e6498a0f3a3" style="color: #1068bf;">44692713</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-13T05:58:56-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts/linker: Add support for .fini sections
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beebf546c9ea818c9d5a61688bfee8f3b7dbeb9f" style="color: #1068bf;">beebf546</a></strong>
<div>
<span>by Simon Hengel</span>
<i>at 2022-10-13T05:59:37-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Update phases.rst
(the name of the original source file is $1, not $2)</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eda6c05e65144b35de62c33d0fd5d35a417233ac" style="color: #1068bf;">eda6c05e</a></strong>
<div>
<span>by Finley McIlwaine</span>
<i>at 2022-10-13T06:00:17-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Clearer error msg for newtype GADTs with defaulted kind
When a newtype introduces GADT eq_specs due to a defaulted
RuntimeRep, we detect this and print the error message with
explicit kinds.
This also refactors newtype type checking to use the new
diagnostic infra.
Fixes #21447
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43ab435afc01284c1fb7e500783703f580a55a90" style="color: #1068bf;">43ab435a</a></strong>
<div>
<span>by Pierre Le Marre</span>
<i>at 2022-10-14T07:45:43-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add standard Unicode case predicates isUpperCase and isLowerCase.
These predicates use the standard Unicode case properties and are more intuitive than isUpper and isLower.
Approved by CLC in https://github.com/haskell/core-libraries-committee/issues/90#issuecomment-1276649403.
Fixes #14589
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aec5a443bc45ca99cfeedc1777edb0aceca142cf" style="color: #1068bf;">aec5a443</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-10-14T07:46:21-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Add type signatures in where-clause of Data.List.permutations
The type of interleave' is very much revealing, otherwise it's extremely tough to decipher.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee0deb8054da2a597fc5624469b4c44fd769ada2" style="color: #1068bf;">ee0deb80</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-14T18:29:20-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>rts: Use pthread_setname_np correctly on Darwin
As noted in #22206, pthread_setname_np on Darwin only supports
setting the name of the calling thread. Consequently we must introduce
a trampoline which first sets the thread name before entering the thread
entrypoint.</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8eff62a43cebbb21f00aeea138bcc343d8ac8f34" style="color: #1068bf;">8eff62a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-14T18:29:57-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>testsuite: Add test for #22282
This will complement mpickering's more general port of foundation's
numerical testsuite, providing a test for the specific case found
in #22282.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62a550010ed94e1969c96150f2781854a0802766" style="color: #1068bf;">62a55001</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2022-10-14T18:29:57-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>ncg/aarch64: Fix sub-word sign extension yet again
In adc7f108141a973b6dcb02a7836eed65d61230e8 we fixed a number of issues
to do with sign extension in the AArch64 NCG found by ghc/test-primops>.
However, this patch made a critical error, assuming that getSomeReg
would allocate a fresh register for the result of its evaluation.
However, this is not the case as `getSomeReg (CmmReg r) == r`.
Consequently, any mutation of the register returned by `getSomeReg` may
have unwanted side-effects on other expressions also mentioning `r`. In
the fix listed above, this manifested as the registers containing the
operands of binary arithmetic operations being incorrectly
sign-extended. This resulted in #22282.
Sadly, the rather simple structure of the tests generated
by `test-primops` meant that this particular case was not exercised.
Even more surprisingly, none of our testsuite caught this case.
Here we fix this by ensuring that intermediate sign extension is
performed in a fresh register.
Fixes #22282.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/156d71811421e3f7b19f63b63ff502bd373ee75f" style="color: #1068bf;">156d7181</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-10-17T11:55:11+02:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Avoid allocating intermediate lists for non recursive bindings.
We do so by having an explicit folding function that doesn't need to
allocate intermediate lists first.
Fixes #22196
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">30 changed files:</h4>
<ul>
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<a href="#626a747c8694eaae66f2afb3d1a745b045782c70" style="color: #1068bf;">
.editorconfig
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<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db" style="color: #1068bf;">
.gitlab/ci.sh
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<a href="#8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d" style="color: #1068bf;">
README.md
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<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77" style="color: #1068bf;">
compiler/GHC/Builtin/Names.hs
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<a href="#377cfd14c1f92357465df995ec6537b074051322" style="color: #1068bf;">
compiler/GHC/Builtin/Types.hs
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<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2" style="color: #1068bf;">
compiler/GHC/Builtin/primops.txt.pp
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<a href="#db697f6aea9f93f1583f1d5c62d25570a1e07f73" style="color: #1068bf;">
compiler/GHC/Cmm/CLabel.hs
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<a href="#806448db91cc2906ebcc088107220a663d3d43eb" style="color: #1068bf;">
compiler/GHC/Cmm/CommonBlockElim.hs
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<a href="#92b713d88390e6ea489e24b6cff8a3960384c0d0" style="color: #1068bf;">
compiler/GHC/Cmm/DebugBlock.hs
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<a href="#cf82b82d6e47b3c81686a3340668a31ce028e2a1" style="color: #1068bf;">
compiler/GHC/Cmm/Lint.hs
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compiler/GHC/Cmm/Node.hs
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compiler/GHC/Cmm/Parser.y
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<a href="#072618a3250e1148569c2d2e0c05e313c2f529e3" style="color: #1068bf;">
compiler/GHC/Cmm/Switch.hs
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compiler/GHC/CmmToAsm.hs
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compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
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compiler/GHC/CmmToAsm/AArch64/Ppr.hs
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compiler/GHC/CmmToAsm/CFG/Dominators.hs
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<a href="#ea29061dab1b843e0ea9294afc614998f3a8d08f" style="color: #1068bf;">
compiler/GHC/CmmToAsm/Monad.hs
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compiler/GHC/CmmToAsm/Reg/Liveness.hs
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<a href="#335d279236d65dcf13f2bab3891e515cb803203c" style="color: #1068bf;">
compiler/GHC/CmmToAsm/X86/Ppr.hs
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<a href="#76664ab267df4fc0bec2465efd78bf0afacfe3a7" style="color: #1068bf;">
compiler/GHC/CmmToC.hs
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<a href="#1aff3a222f2ec5c5498930c3d145b401cc300028" style="color: #1068bf;">
compiler/GHC/CmmToLlvm.hs
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<a href="#b5ac041c7f79084a7a7626eda4cdadda3457d235" style="color: #1068bf;">
compiler/GHC/CmmToLlvm/Base.hs
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<a href="#182d6a315e784018aa9c8b2ad736036b97bd5d48" style="color: #1068bf;">
compiler/GHC/Core.hs
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386" style="color: #1068bf;">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#f10ed7a2470454dfdd8691a08beba67d8b78ee70" style="color: #1068bf;">
compiler/GHC/Core/Coercion/Axiom.hs
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<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865" style="color: #1068bf;">
compiler/GHC/Core/DataCon.hs
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<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e" style="color: #1068bf;">
compiler/GHC/Core/FamInstEnv.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e" style="color: #1068bf;">
compiler/GHC/Core/Lint.hs
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<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999" style="color: #1068bf;">
compiler/GHC/Core/Opt/Arity.hs
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