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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Matthew Pickering pushed to branch wip/optim-faststring 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: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a1d923786baed5b001c523fd2a76f133be510b04">a1d92378</a></strong>
<div>
<span> by Brandon Chinn </span> <i> at 2025-01-25T15:11:54-08:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Fix for alex-3.5.2.0 (#25623)
This INLINE pragma for alexScanUser was added in 9.12, but then I
ported the change to alex in 3.5.2.0
(https://github.com/haskell/alex/pull/262).
I didn't realize that GHC errors on duplicate INLINE pragmas, so
this ended up being a breaking change.
This change should be backported into 9.12
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62760367dca36da5828875c5423109f9a5523337">62760367</a></strong>
<div>
<span> by ARATA Mizuki </span> <i> at 2025-01-27T16:23:06-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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: Make MOVD's output format explicit
The old design led to inference of a wrong format,
losing upper bits of a vector register.
Fixes #25659
Co-authored-by: sheaf <sam.derbyshire@gmail.com>
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f19ab49091675faba8619428a780e706ed3314fc">f19ab490</a></strong>
<div>
<span> by Simon Hengel </span> <i> at 2025-01-27T16:23:45-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>doc: Correct JSON schema for `-fdiagnostics-as-json` (fixes #25393)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e16eae6548743870e77c2c93527bab1d24cff81c">e16eae65</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2025-01-27T21:41:39+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>hadrian: fix bootstrap with 9.12.1
This patch bumps hadrian index-state to fix bootstrap with 9.12.1.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8071bad8b185bc9d0f71e08b6520a5d5705e2636">8071bad8</a></strong>
<div>
<span> by Jeffrey Young </span> <i> at 2025-01-28T21:45:32-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>base: add SrcLoc changes to changelog, 4.21.0.0
I accidentally dropped this in !13381
- closes #25614
See:
- ea4587794b9e3a098f9c02bd6cea2294af2539ce (the 13381 commit)
- Issue #25614
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9dcc7e28e24b66d647a7e971c8ceda5a00b49f83">9dcc7e28</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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 `cloneBndrs` and such — now all the monadic ones have an `M` suffix.
We now have `cloneBndrs` and `cloneRecIdBndrs` which take a `UniqSupply` argument, and `cloneBndrsM` and `cloneRecIdBndrsM` which rather have a `MonadUnique` constraint.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/643dd3d86968c527ba07ece9cc337728dbdfe2a0">643dd3d8</a></strong>
<div>
<span> by Matthew Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Use `Infinite` in unique generation, and clean up some other partial uni patterns as well.
Also drop the losing `instance MonadFail UniqSM`.
We redefine `getUniquesM` in terms of `Infinite` rather than `[]`, and define another method `getUniqueListM` for the use sites where we actually want a `[]`.
Thus, at many sites, we can avoid the partiality of the empty list case.
We also define `withUniques`, `withUniquesM`, and `withUniquesM'`, which traverse an arbitrary `Traversable` structure and introduce a `Unique` for each element.
This allows us to redefine various functions to operate on more appropriate types than `[]` and avoid further partiality (in the form of incomplete-uni-patterns).
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd0acc3cd32264e9fbea303f66e1dd03b6d9e8a5">dd0acc3c</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Use `Infinite` in `GHC.Tc.Deriv.Functor`.
Make the list of variables to use in generated code `Infinite`, to avoid panicking on the (now impossible) empty list case.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e9adedf6683a93597c8fb8bd3dcbe6fc91136a4">4e9adedf</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Use `Infinite` in `GHC.Runtime.Debugger`.
Make the list of available names `Infinite`, to avoid panicking on the (now impossible) empty list case.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bed812b738b3f71375aae3d25a5329cc7bac50c5">bed812b7</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Avoid incomplete-uni-patterns in `GHC.Cmm.DebugBlock`.
We do so by changing the type of `BlockContext` to statically (in GHC) exclude the possibility of Cmm statics, and using `NonEmpty` lists of `BlockContext`s in `cmmDebugGen`.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27587df3cc40de5f0671e31631bc6995af86dfbb">27587df3</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Avoid incomplete-uni-patterns in `GHC.Types.Literal`.
We do so by introducing `mkLitNumberWrap'` whose ultimate codomain is `Integer` rather than `Literal`, and then use that rather than `mkLitNumberWrap` where we just need the number rather than the `Literal`.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/138de0ff0053548dad45d6ed076bb27b366fbc58">138de0ff</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Avoid incomplete-uni-patterns in `GHC.CmmToAsm.X86.CodeGen`.
- Match the vector element list only once in `shuffleInstructions`.
- Define `isSuitableFloatingPointLit_maybe` which returns `Just` the width if the lit is indeed suitable.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8cb3d36127fea85dc83dbc39fe2b0673f58dc42">d8cb3d36</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Clean up more incomplete uni patterns.
At some sites, we merely panic if the `[]` or `Maybe` is empty when we convert to `NonEmpty` or `Identity`, but at least now we make it explicit.
At other sites, we are able to use more precise types and avoid the partiality altogether. To do so, we redefine various functions to operate over `Traversable` arguments, so we can use the appropriate shape where known.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f251bd223cdd27e02d688844dadc5e19ea91344a">f251bd22</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-01-29T02:27:48-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Outline `expectJustPanic`.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a963a1a5d38cd6fbb722f3d25c31744238d71b65">a963a1a5</a></strong>
<div>
<span> by Marc Scholten </span> <i> at 2025-01-29T02:28:35-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>base: Introduce Data.Enum.enumerate (CLC #306)
https://github.com/haskell/core-libraries-committee/issues/306
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/944712dad749f39d087b868d8e5c2126601994f9">944712da</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-01-29T02:29:13-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>base: Update description of locking behavior</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85abc69c223a692652c8767c49dacfd1ce6c9bf3">85abc69c</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-01-29T02:29:51-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>base: Fix @since annotation of Data.Bounded
Fixes #25615.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ca41c62cf6ecb3edeb3037be94777febe1408e5">2ca41c62</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-01-29T02:30:29-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>StgToByteCode: Fix overly-broad handling of Addr# literals
Previously we assumed that all unlifted types were `Addr#` but this
isn't true. As noted in #25638, unlifted nullary data constructor
workers can also appear at the top-level and are obviously not of type
`Addr#`.
Note that there is more work to be done to properly handle unlifted data
constructors (especially nullary; see #25636). However, this is a small
step in the right direction.
Closes #25641.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec26c54d818e0cd328276196930313f66b780905">ec26c54d</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-01-29T02:30:29-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>StgToByteCode: Assert that PUSH_G'd values are lifted
We currently do not support top-level unlifted data constructor applications,
therefore this is a safe assertion.
Pointed out by @sheaf.</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8847125fecdccc4dcda45b1dba519c6dd88b4401">8847125f</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-01-29T02:31:07-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>gitlab-ci: Run test-primops testsuite in ~"full-ci" pipeline
Closes #25654.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf8c7d6edf224c083c90ab3ddac49979ac18ad39">bf8c7d6e</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2025-01-29T02:31:44-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>bytecode: Do not generate `SLIDE x 0` instructions
SLIDE x 0 is a no-op as it means to shift x elements of the stack by no
spaces. In the interpreter, this results in a loop which copies an array
element into the same place.
I have instrumented GHCi to count how many of these instructions are interpreted.
The workload was `ghc` compiling two simple modules.
Total no-op slides: 7793476
Total slides: 11413289
Percentage useless (slides): 68%
Percentage uselss of total instructions: 9%
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e97bdd8cb337c3ea23326d88f83219e84f381a42">e97bdd8c</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2025-01-29T10:49:25+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>compiler: Always load GHC.Data.FastString optimised into GHCi
The FastString table is shared between the boot compiler and interpreted
compiler. Therefore it's very important the representation of
`FastString` matches in both cases. Otherwise, the interpreter will read
a FastString from the shared variable but place the fields in the wrong
place which leads to segfaults.
Ideally this state would not be shared, but for now we can always
compile both with `-O2` and this leads to a working interpreter.
</pre>
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.gitlab-ci.yml
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compiler/GHC/Cmm/DebugBlock.hs
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compiler/GHC/Cmm/MachOp.hs
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compiler/GHC/Cmm/ThreadSanitizer.hs
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compiler/GHC/Core/Make.hs
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compiler/GHC/Core/Opt/WorkWrap/Utils.hs
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compiler/GHC/Core/Subst.hs
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compiler/GHC/Core/TyCo/Tidy.hs
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compiler/GHC/Core/Unify.hs
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compiler/GHC/CoreToStg/Prep.hs
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compiler/GHC/Data/FastString.hs
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