[all-commits] [llvm/llvm-project] 074209: [llvm-exegesis] Use older instructions to load low...

[Aiden Grossman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 074209034f1c6193b37af004bb622683e84a1648
      https://github.com/llvm/llvm-project/commit/074209034f1c6193b37af004bb622683e84a1648
  Author: Aiden Grossman <aidengrossman at google.com>
  Date:   2024-11-04 (Mon, 04 Nov 2024)

  Changed paths:
    M llvm/tools/llvm-exegesis/lib/X86/Target.cpp
    M llvm/unittests/tools/llvm-exegesis/X86/TargetTest.cpp

  Log Message:
  -----------
  [llvm-exegesis] Use older instructions to load lower vregs (#114768)

This patch makes X86 llvm-exegesis unconditionally use older
instructions to load the lower vector registers, rather than trying to
use AVX512 for everything when available. This fixes a case where we
would try and load AVX512 registers using the older instructions if such
a snippet was constructed while -mcpu was set to something that did not
support AVX512. This would lead to a machine code verification error
rather than resulting in incomplete snippet setup, which seems to be the
intention of how this should work.

Fixes #114691.



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