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<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Jade pushed to branch wip/T24477 at <a href="https://gitlab.haskell.org/ghc/ghc">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/3b51995c158fe19d48839b92cf1ff78ce7825ce4">3b51995c</a></strong>
<div>
<span> by Andrei Borzenkov </span> <i> at 2024-05-07T14:39:40-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Rename Solo# data constructor to MkSolo# (#24673)
- data Solo# a = (# a #)
+ data Solo# a = MkSolo# a
And `(# foo #)` syntax now becomes just a syntactic
sugar for `MkSolo# a`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d59abf295cd371448f22c1724b955dce4974302">4d59abf2</a></strong>
<div>
<span> by Arsen Arsenović </span> <i> at 2024-05-07T14:40:24-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Add the cmm_cpp_is_gcc predicate to the testsuite
A future C-- test called T24474-cmm-override-g0 relies on the
GCC-specific behaviour of -g3 implying -dD, which, in turn, leads to it
emitting #defines past the preprocessing stage. Clang, at least, does
not do this, so the test would fail if ran on Clang.
As the behaviour here being tested is ``-optCmmP-g3'' undoing effects of
the workaround we apply as a fix for bug #24474, and the workaround was
for GCC-specific behaviour, the test needs to be marked as fragile on
other compilers.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25b0b40467d0a12601497117c0ad14e1fcab0b74">25b0b404</a></strong>
<div>
<span> by Arsen Arsenović </span> <i> at 2024-05-07T14:40:24-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Split out the C-- preprocessor, and make it pass -g0
Previously, C-- was processed with the C preprocessor program. This
means that it inherited flags passed via -optc. A flag that is somewhat
often passed through -optc is -g. At certain -g levels (>=2), GCC
starts emitting defines *after* preprocessing, for the purposes of
debug info generation. This is not useful for the C-- compiler, and, in
fact, causes lexer errors. We can suppress this effect (safely, if
supported) via -g0.
As a workaround, in older versions of GCC (<=10), GCC only emitted
defines if a certain set of -g*3 flags was passed. Newer versions check
the debug level. For the former, we filter out those -g*3 flags and,
for the latter, we specify -g0 on top of that.
As a compatible and effective solution, this change adds a C--
preprocessor distinct from the C compiler and preprocessor, but that
keeps its flags. The command line produced for C-- preprocessing now
looks like:
$pgmCmmP $optCs_without_g3 $g0_if_supported $optCmmP
Closes: https://gitlab.haskell.org/ghc/ghc/-/issues/24474
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b4129a580e6c1d18197ef2ed3a8b89d52a2b133">9b4129a5</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-05-08T13:24:20-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>-fprof-late: Only insert cost centres on functions/non-workfree cafs.
They are usually useless and doing so for data values comes with
a large compile time/code size overhead.
Fixes #24103
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/259b63d32e77e935a9a4f54f6823f89a51fa3fc5">259b63d3</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-05-08T13:24:57-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Simplifier: Preserve OccInfo on DataAlt fields when case binder is dead (#24770)
See the adjusted `Note [DataAlt occ info]`.
This change also has a positive repercussion on
`Note [Combine case alts: awkward corner]`.
Fixes #24770.
We now try not to call `dataConRepStrictness` in `adjustFieldsIdInfo` when all
fields are lazy anyway, leading to a 2% ghc/alloc decrease in T9675.
Metric Decrease:
T9675
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31b28cdb4adde2ab14adb153afa817ef9197830f">31b28cdb</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-05-08T13:24:57-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Kill seqRule, discard dead seq# in Prep (#24334)
Discarding seq#s in Core land via `seqRule` was problematic; see #24334.
So instead we discard certain dead, discardable seq#s in Prep now.
See the updated `Note [seq# magic]`.
This fixes the symptoms of #24334.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2682534f1a707b6b3a955837ffd4d0e33d408d2">b2682534</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2024-05-10T01:47:51-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Document NcgImpl methods
Fixes #19914
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d3acbcf4c78636afd79883ad021ed6f7ea92a75">4d3acbcf</a></strong>
<div>
<span> by Zejun Wu </span> <i> at 2024-05-10T01:48:28-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Make renamer to be more flexible with parens in the LHS of the rules
We used to reject LHS like `(f a) b` in RULES and requires it to be written as
`f a b`. It will be handy to allow both as the expression may be more
readable with extra parens in some cases when infix operator is involved.
Espceially when TemplateHaskell is used, extra parens may be added out of
user's control and result in "valid" rules being rejected and there
are not always ways to workaround it.
Fixes #24621
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab840ce6f83a74f36dac939d087b69f97404399a">ab840ce6</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2024-05-10T01:49:04-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>IPE: Eliminate dependency on Read
Instead of encoding the closure type as decimal string we now simply
represent it as an integer, eliminating the need for `Read` in
`GHC.Internal.InfoProv.Types.peekInfoProv`.
Closes #24504.
-------------------------
Metric Decrease:
T24602_perf_size
size_hello_artifact
-------------------------
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9979f55d0f688fabd25ee318e44b9addd904988">a9979f55</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2024-05-10T01:49:43-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>testsuite: fix testwsdeque with recent clang
This patch fixes compilation of testwsdeque.c with recent versions of
clang, which will fail with the error below:
```
testwsdeque.c:95:33: error:
warning: format specifies type 'long' but the argument has type 'void *' [-Wformat]
95 | barf("FAIL: %ld %d %d", p, n, val);
| ~~~ ^
testwsdeque.c:95:39: error:
warning: format specifies type 'int' but the argument has type 'StgWord' (aka 'unsigned long') [-Wformat]
95 | barf("FAIL: %ld %d %d", p, n, val);
| ~~ ^~~
| %lu
testwsdeque.c:133:42: error:
error: incompatible function pointer types passing 'void (void *)' to parameter of type 'OSThreadProc *' (aka 'void *(*)(void *)') [-Wincompatible-function-pointer-types]
133 | createOSThread(&ids[n], "thief", thief, (void*)(StgWord)n);
| ^~~~~
/workspace/ghc/_build/stage1/lib/../lib/x86_64-linux-ghc-9.11.20240502/rts-1.0.2/include/rts/OSThreads.h:193:51: error:
note: passing argument to parameter 'startProc' here
193 | OSThreadProc *startProc, void *param);
| ^
2 warnings and 1 error generated.
```
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2b33fc9091c7b30962d88e7144fb8705b881631">c2b33fc9</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2024-05-10T01:50:20-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Rename pre-processor invocation args
Small clean up. Uses proper names for the various groups of arguments
that make up the pre-processor invocation.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b1af08b94024c104b54eadd710855e9f8a90fb6">2b1af08b</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2024-05-10T01:50:55-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>ghc-heap: fix typo in ghc-heap cbits
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52fb7dbe7e937f72a052dca84fb472e0fd02296c">52fb7dbe</a></strong>
<div>
<span> by Jade </span> <i> at 2024-05-10T23:50:18+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","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: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Improve suggestions for language extensions
- When suggesting Language extensions, also suggest Extensions which imply them
- Suggest ExplicitForAll and GADTSyntax instead of more specific
extensions
- Rephrase suggestion to include the term 'Extension'
- Also moves some flag specific definitions out of Session.hs into
Flags.hs (#24478)
Fixes: #24477
Fixes: #24448
Fixes: #10893
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
30 changed files:
</h4>
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<a href="#377cfd14c1f92357465df995ec6537b074051322">
compiler/GHC/Builtin/Types.hs
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<li class="file-stats">
<a href="#f73a4fa90a8eb153bccdcfcc9f63c15edcd66785">
compiler/GHC/Cmm.hs
</a>
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<li class="file-stats">
<a href="#eacd1b9f80d5d0d583319647ad779d926200f726">
compiler/GHC/CmmToAsm/AArch64/RegInfo.hs
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<a href="#ea29061dab1b843e0ea9294afc614998f3a8d08f">
compiler/GHC/CmmToAsm/Monad.hs
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<a href="#7b360ca84c1b9aaecc0f9de207a7698dc36514fe">
compiler/GHC/CmmToAsm/X86/Instr.hs
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<a href="#f67efdd3ec0e6a124bc1f40bec7c1e910d36c06c">
compiler/GHC/Core/LateCC.hs
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<a href="#e9dcf226ea260581a815d3eaff0049e11529205c">
compiler/GHC/Core/LateCC/TopLevelBinds.hs
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<a href="#f264f4258163c8fe6b333c218f25a0eb1ecc2fe0">
compiler/GHC/Core/LateCC/Types.hs
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compiler/GHC/Core/Opt/CSE.hs
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compiler/GHC/Core/Opt/ConstantFold.hs
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compiler/GHC/Core/Opt/OccurAnal.hs
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<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5">
compiler/GHC/Core/Opt/SetLevels.hs
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compiler/GHC/Core/Opt/Simplify/Iteration.hs
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<a href="#b6a5ba32bafb8fbda933538b3007e755fef6f101">
compiler/GHC/Core/Opt/SpecConstr.hs
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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
compiler/GHC/CoreToStg/Prep.hs
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compiler/GHC/Driver/DynFlags.hs
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<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
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<a href="#9a679a2680ef6061397f1987091ea9f96ffe095d">
compiler/GHC/Driver/Main.hs
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<a href="#64e68d52c0898049455e20b0d001ffe1dd07ff83">
compiler/GHC/Driver/Pipeline/Execute.hs
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<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<a href="#0b4bc77723e1f22f50d70e89a81f6d92c3904408">
compiler/GHC/Iface/Recomp/Flags.hs
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<a href="#4769efc0cb06e92bc7562e31984f6d7d91048e51">
compiler/GHC/Parser/Errors/Ppr.hs
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<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<a href="#906f88b2ba5bce224c8a08c72cea531fdb95ca55">
compiler/GHC/Settings.hs
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compiler/GHC/Settings/IO.hs
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<a href="#474afbd1996fa06b8bc9410a2805103be57860f7">
compiler/GHC/StgToCmm/InfoTableProv.hs
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<a href="#1d9db80eb96ba810823e994df91686a927f469d9">
compiler/GHC/SysTools/Cpp.hs
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<a href="#44b98437cdd35d6836caab46e32906e669708388">
compiler/GHC/SysTools/Tasks.hs
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<a href="#1dd9c7a6bbc222c976a6ec1c4b772232ae60f7e5">
compiler/GHC/Tc/Errors/Ppr.hs
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<div class="footer" style="margin-top: 10px;">
<p style="font-size: small; color: #737278;">
—
<br>
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