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Update BitArray.CopyTo to use the xplat intrinsics #116079

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tannergooding opened this issue May 28, 2025 · 2 comments · May be fixed by #115069
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Update BitArray.CopyTo to use the xplat intrinsics #116079

tannergooding opened this issue May 28, 2025 · 2 comments · May be fixed by #115069
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area-System.Collections help wanted [up-for-grabs] Good issue for external contributors

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@tannergooding
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As per #114818 (comment), BitArray.CopyTo could benefit from using the cross platform intrinsic APIs rather than the platform specific ones.

This can be achieved by swapping out these API calls:

  • Avx512BW.IsSupported -> Vector512.IsHardwareAccelerated
  • Avx512BW.Shuffle(x, y) -> Vector512.Shuffle(x, y)
  • Avx512F.And(x, y) -> x & y
  • Avx512BW.Min(x, y) -> Vector512.Min(x, y)
  • Avx512F.Store(x, y) -> y.Store(x)

Similar changes could also be made to the Avx2 path (using Vector256) and so on.
@dotnet-policy-service dotnet-policy-service bot added the untriaged New issue has not been triaged by the area owner label May 28, 2025
@tannergooding tannergooding added area-System.Collections help wanted [up-for-grabs] Good issue for external contributors and removed area-System.Runtime.Intrinsics untriaged New issue has not been triaged by the area owner labels May 28, 2025
@tannergooding tannergooding mentioned this issue May 28, 2025
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@tfenise tfenise linked a pull request May 29, 2025 that will close this issue
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Improve System.Collections.BitArray tfenise/runtime
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