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lib/x86/crc32: target pclmul,sse4.1 instead of pclmul #397

Merged
merged 1 commit into from
Oct 26, 2024
Merged

lib/x86/crc32: target pclmul,sse4.1 instead of pclmul #397

merged 1 commit into from
Oct 26, 2024

Commits on Oct 26, 2024

  1. lib/x86/crc32: target pclmul,sse4.1 instead of pclmul 

    In practice, all CPUs that support PCLMULQDQ also support SSE4.1:

    Intel: Westmere and later + Silvermont and later
    AMD: Bulldozer and later

Therefore, make crc32_x86_pclmulqdq() use SSE4.1 instructions.

To be safe, add an explicit check for SSE4.1 support.  Though as per the
above, this is unnecessary in practice (as far as I can tell).
    @ebiggers
    ebiggers committed Oct 26, 2024
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