[Git][ghc/ghc][wip/T21909] 9 commits: Don't specialise incoherent instance applications

[Apoorv Ingle (@ani)]

Apoorv Ingle pushed to branch wip/T21909 at Glasgow Haskell Compiler / GHC


Commits:
b56025f4 by Gergő Érdi at 2023-02-27T13:34:22+00:00
Don't specialise incoherent instance applications

Using incoherent instances, there can be situations where two
occurrences of the same overloaded function at the same type use two
different instances (see #22448). For incoherently resolved instances,
we must mark them with `nospec` to avoid the specialiser rewriting one
to the other. This marking is done during the desugaring of the
`WpEvApp` wrapper.

Fixes #22448

Metric Increase:
    T15304

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d0c7bbed by Tom Ellis at 2023-02-27T20:04:07-05:00
Fix SCC grouping example

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f84a8cd4 by Bryan Richter at 2023-02-28T05:58:37-05:00
Mark setnumcapabilities001 fragile

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29a04d6e by Bryan Richter at 2023-02-28T05:58:37-05:00
Allow nightly-x86_64-linux-deb10-validate+thread_sanitizer to fail

See #22520

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9fa54572 by Cheng Shao at 2023-02-28T05:59:15-05:00
ghc-prim: fix hs_cmpxchg64 function prototype

hs_cmpxchg64 must return a StgWord64, otherwise incorrect runtime
results of 64-bit MO_Cmpxchg will appear in 32-bit unregisterised
builds, which go unnoticed at compile-time due to C implicit casting
in .hc files.

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0c200ab7 by Simon Peyton Jones at 2023-02-28T11:10:31-05:00
Account for local rules in specImports

As #23024 showed, in GHC.Core.Opt.Specialise.specImports, we were
generating specialisations (a locally-define function) for imported
functions; and then generating specialisations for those
locally-defined functions.  The RULE for the latter should be
attached to the local Id, not put in the rules-for-imported-ids
set.

Fix is easy; similar to what happens in GHC.HsToCore.addExportFlagsAndRules

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8b77f9bf by Sylvain Henry at 2023-02-28T11:11:21-05:00
JS: fix for overlap with copyMutableByteArray# (#23033)

The code wasn't taking into account some kind of overlap.

cgrun070 has been extended to test the missing case.

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239202a2 by Sylvain Henry at 2023-02-28T11:12:03-05:00
Testsuite: replace some js_skip with req_cmm

req_cmm is more informative than js_skip

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42dac9ef by Apoorv Ingle at 2023-02-28T17:50:32+00:00
Constraint simplification loop now depends on `ExpansionFuel`
instead of a boolean flag for `CDictCan.cc_pend_sc`.
Pending givens get a fuel of 3 while Wanted and quantified constraints get a fuel of 1.
This helps pending given constraints to keep up with pending wanted constraints in case of
`UndecidableSuperClasses` and superclass expansions while simplifying the infered type.

Adds 3 dynamic flags for controlling the fuels for each type of constraints
`-fgivens-expansion-fuel` for givens `-fwanteds-expansion-fuel` for wanteds and `-fqcs-expansion-fuel` for quantified constraints

Fixes #21909
Added Tests T21909, T21909b
Added Note [SimplifyInfer and UndecidableSuperClasses]

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30 changed files:

- .gitlab/gen_ci.hs
- .gitlab/jobs.yaml
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Binds.hs-boot
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/Settings/Constants.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Canonical.hs
- compiler/GHC/Tc/Solver/Interact.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/Evidence.hs
- docs/users_guide/9.8.1-notes.rst
- docs/users_guide/expected-undocumented-flags.txt


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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f389a12433544d6a84ea08bbd3bae681faa27870...42dac9ef24ff1f7486ddae3c6429b2ca7c2802ae

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f389a12433544d6a84ea08bbd3bae681faa27870...42dac9ef24ff1f7486ddae3c6429b2ca7c2802ae
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