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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Ben Gamari pushed to branch wip/T24471 at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<ul>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61bb5ff68630c203eaae4baba554640246df5a63">61bb5ff6</a></strong>
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<span> by Finley McIlwaine </span> <i> at 2024-03-04T09:01:40-08:00 </i>
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<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 -fprof-late-overloaded and -fprof-late-overloaded-calls
* Refactor late cost centre insertion for extensibility
* Add two more late cost centre insertion methods that add SCCs to overloaded
top level bindings and call sites with dictionary arguments.
* Some tests for the basic functionality of the new insertion methods
Resolves: #24500
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</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82ccb8012ba532f0fa06dc6ff96d33217560088a">82ccb801</a></strong>
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<span> by Andreas Klebinger </span> <i> at 2024-03-04T19:59:14-05:00 </i>
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<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;'>x86-ncg: Fix fma codegen when arguments are globals
Fix a bug in the x86 ncg where results would be wrong when the desired output
register and one of the input registers were the same global.
Also adds a tiny optimization to make use of the memory addressing
support when convenient.
Fixes #24496
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/afb90d4cb3642b37f8f80cb1e6289f54bc9ba6bf">afb90d4c</a></strong>
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<span> by Ben Gamari </span> <i> at 2024-03-05T08:22:58-05:00 </i>
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<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-experimental: Add dummy dependencies to work around #24436
This is a temporary measure to improve CI reliability until a proper
solution is developed.
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<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/427a7d2e6175b972773ad9a43580a98e0c9e95de">427a7d2e</a></strong>
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<span> by Simon Peyton Jones </span> <i> at 2024-03-05T08:23:23-05:00 </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;'>Three compile perf improvements with deep nesting
These were changes are all triggered by #24471.
1. Make GHC.Core.Opt.SetLevels.lvlMFE behave better when there are
many free variables. See Note [Large free-variable sets].
2. Make GHC.Core.Opt.Arity.floatIn a bit lazier in its Cost argument.
This benefits the common case where the ArityType turns out to
be nullary. See Note [Care with nested expressions]
3. Make GHC.CoreToStg.Prep.cpeArg behave for deeply-nested
expressions. See Note [Eta expansion of arguments in CorePrep]
wrinkle (EA2).
Compile times go down by up to 3.5%, and much more in artificial
cases.
Metric Decrease:
CoOpt_Read
T12425
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