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<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Bryan R pushed to branch wip/fragile-T7919
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/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/5072e6c34af3e526476b17320614193061845b3b" style="color: #1068bf;">5072e6c3</a></strong>
<div>
<span>by Bryan Richter</span>
<i>at 2022-10-11T10:56:09+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.
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">30 changed files:</h4>
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.editorconfig
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<a href="#8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d" style="color: #1068bf;">
README.md
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<a href="#ae6d91a5d028418bbf1431347d659e744e0a3128" style="color: #1068bf;">
compiler/GHC/Core/Opt/Simplify/Iteration.hs
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<a href="#48fbb5cdea308650de5756521feb28ec68819b9b" style="color: #1068bf;">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7" style="color: #1068bf;">
compiler/GHC/Parser/PostProcess.hs
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<a href="#aebe2c3d616f6843166d2657bed048898add6bc9" style="color: #1068bf;">
compiler/GHC/Tc/Instance/Class.hs
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<a href="#6fba19c2a66f557540babf34439bff02e6fec18a" style="color: #1068bf;">
compiler/GHC/Utils/Json.hs
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<a href="#cb4ad425e8ed846dfcc5d3793b08b95f6864e545" style="color: #1068bf;">
compiler/GHC/Utils/Monad.hs
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<a href="#093cf1ab10ea2bac043566f4a5e4a1c4a1eaf5e6" style="color: #1068bf;">
docs/users_guide/9.6.1-notes.rst
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<a href="#4889f69b85184de1c7efb5be8943b9e6d741dc27" style="color: #1068bf;">
docs/users_guide/exts/pattern_synonyms.rst
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libraries/base/Data/Array/Byte.hs
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<a href="#92fed88efc6a2e0461a84dd0d0f0bfb89bdbc799" style="color: #1068bf;">
libraries/base/GHC/TypeLits.hs
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libraries/base/GHC/TypeNats.hs
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libraries/base/changelog.md
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libraries/base/tests/T15183.hs
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rts/include/Stg.h
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testsuite/tests/dependent/should_compile/RaeJobTalk.hs
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testsuite/tests/ghci/scripts/T19667Ghci.hs
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