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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Marge Bot pushed to branch wip/marge_bot_batch_merge_job 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/e1e7b1a4cc48905037132c30adbfbf7ad9b48676">e1e7b1a4</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-05-07T21:13:56-04:00 </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/b8db6ac290792a3635af54448dae63d06193c33b">b8db6ac2</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-05-07T21:13:57-04:00 </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/413985ad937ec77a40c7a59ae12eb9ff6f6c98df">413985ad</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-05-07T21:13:57-04:00 </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>
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30 changed files:
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<a href="#377cfd14c1f92357465df995ec6537b074051322">
compiler/GHC/Builtin/Types.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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<a href="#446b4afbe6836b950115a619acea24ddde19dc90">
compiler/GHC/Core/Opt/CSE.hs
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<a href="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
compiler/GHC/Core/Opt/ConstantFold.hs
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<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
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<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5">
compiler/GHC/Core/Opt/SetLevels.hs
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<a href="#ae6d91a5d028418bbf1431347d659e744e0a3128">
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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<a href="#9a679a2680ef6061397f1987091ea9f96ffe095d">
compiler/GHC/Driver/Main.hs
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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="#906f88b2ba5bce224c8a08c72cea531fdb95ca55">
compiler/GHC/Settings.hs
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compiler/GHC/Settings/IO.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="#261c0c5029eb34eb7436b087d77314f377ff8223">
compiler/GHC/Types/Id/Make.hs
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<a href="#804ef387cfc0e82b5b58b0764a766737229ac624">
compiler/GHC/Types/RepType.hs
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<a href="#87db583be5c13c1f7b3c958b10e03d67b6a2ca06">
configure.ac
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distrib/configure.ac.in
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docs/users_guide/9.12.1-notes.rst
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docs/users_guide/phases.rst
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docs/users_guide/profiling.rst
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hadrian/bindist/Makefile
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hadrian/bindist/config.mk.in
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hadrian/cfg/default.host.target.in
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