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base repository: darvid/python-hyperscan
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head repository: darvid/python-hyperscan
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compare: fix/simde-backend-x86-perf-253
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  • 6 commits
  • 3 files changed
  • 1 contributor

Commits on Feb 11, 2026

  1. fix(build): only enable SIMDE_BACKEND for non-x86 architectures (#253) 

    - SIMDE_BACKEND was unconditionally enabled for all vectorscan builds,
  which disables native x86 CPU feature detection and caps performance
  at SSE2 level
- on x86-64, this caused a ~2.5-13x throughput regression vs v0.7.21
  because vectorscan's runtime dispatch to SSE4.2/AVX2/AVX512 code
  paths was completely bypassed
- now only enables SIMDE_BACKEND on ARM and other non-x86 architectures
  where vectorscan genuinely needs the SIMD emulation layer
- add benchmark script for reproducing and validating the regression
    @darvid
    darvid committed Feb 11, 2026
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  2. ci(build): replace deprecated macos-13 runners with macos-15 

    - GitHub deprecated macos-13 (Intel) runners
- macOS x86_64 wheels are now cross-compiled on ARM runners via
  Rosetta 2, which cibuildwheel handles natively
    @darvid
    darvid committed Feb 11, 2026
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  3. build: patch vectorscan x86-64-v2 march for older GCC compat 

    - vectorscan 5.4.12 uses -march=x86-64-v2 in cflags-x86.cmake and
  archdetect.cmake, but GCC <11 (manylinux2014 devtoolset) does not
  recognize this value
- patch source at build time to use -march=nehalem which provides the
  same SSE4.2 baseline and is supported by all GCC versions
- only applied when using native x86 backend (not SIMDE_BACKEND)
    @darvid
    darvid committed Feb 11, 2026
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  4. build: fix macOS x86_64 cross-compilation on ARM runners 

    - use CMAKE_OSX_ARCHITECTURES (target arch) instead of
  CMAKE_SYSTEM_PROCESSOR (host arch) for SIMDE_BACKEND decision
  on macOS, so cross-compiling x86_64 on ARM correctly disables
  SIMDE and builds native x86 vectorscan
- forward CMAKE_OSX_ARCHITECTURES to ExternalProject_Add so
  vectorscan builds for the correct target architecture
- handle BSD sed -i syntax difference on macOS for the
  x86-64-v2 → nehalem patch
    @darvid
    darvid committed Feb 11, 2026
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  5. build: use perl for x86-64-v2 patch to fix macOS sed compat 

    - CMake's list handling drops empty string in sed -i "" causing
  BSD sed to fail with "rename(): No such file or directory"
- perl -pi -e works identically on Linux and macOS
    @darvid
    darvid committed Feb 11, 2026
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  6. ci(build): pin uv to 0.9.x to fix Windows build failures 

    - uv 0.10.2 leaks host Python 3.12 stdlib into cibuildwheel
  venvs on Windows, causing SRE module mismatch and import
  errors for non-3.12 Python targets
    @darvid
    darvid committed Feb 11, 2026
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