Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC

Commits:

• 70ee825a
  by Cheng Shao at 2025-10-14T21:52:50-04:00

  testsuite: fix T3586 for non-SSE3 platforms
  
  `T3586.hs` contains `-fvia-C -optc-msse3` which I think is a
  best-effort basis to harvest the C compiler's auto vectorization
  optimizations via the C backend back when the test was added. The
  `-fvia-C` part is now a deprecated no-op because GHC can't fall back
  to the C backend on a non-unregisterised build, and `-optc-msse3`
  might actually cause the test to fail on non x86/x64 platforms, e.g.
  recent builds of wasi-sdk would report `wasm32-wasi-clang: error:
  unsupported option '-msse3' for target 'wasm32-unknown-wasi'`.
  
  So this patch cleans up this historical cruft. `-fvia-C` is removed,
  and `-optc-msse3` is only passed when cpuid contains `pni` (which
  indicates support of SSE3).
  

3 changed files:

• testsuite/driver/cpu_features.py
• testsuite/tests/perf/should_run/T3586.hs
• testsuite/tests/perf/should_run/all.T

Changes:

     # These aren't comprehensive; they are only CPU features that we care about

     # x86:

-    'sse', 'sse2', 'sse3', 'ssse3', 'sse4_1', 'sse4_2',

+    'sse', 'sse2', 'sse3', 'pni', 'ssse3', 'sse4_1', 'sse4_2',

     'avx', 'avx2', 'avx512f',

     'fma',

     'popcnt', 'bmi1', 'bmi2'

 {-# LANGUAGE BangPatterns #-}

-{-# OPTIONS -fvia-C -optc-O3 -fexcess-precision -optc-msse3 #-}

+{-# OPTIONS -optc-O3 -fexcess-precision #-}

 import Control.Monad.ST

 import Data.Array.ST

      [collect_runtime_residency(2),

       collect_stats('bytes allocated', 5),

       only_ways(['normal']),

+      when(have_cpu_feature('pni') or have_cpu_feature('sse3'), extra_hc_opts('-optc-msse3')),

       ],

      compile_and_run,

      ['-O'])