[all-commits] [llvm/llvm-project] 89365b: [X86] IceLakeServer - PACKS instructions take late...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 89365b159eae1be50dc8ec1f29f13406effe12ec
      https://github.com/llvm/llvm-project/commit/89365b159eae1be50dc8ec1f29f13406effe12ec
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-11-20 (Sun, 20 Nov 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86SchedIceLake.td
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-avx2.s
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-avx512bw.s
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-avx512bwvl.s
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-sse2.s
    M llvm/test/tools/llvm-mca/X86/IceLakeServer/resources-sse41.s

  Log Message:
  -----------
  [X86] IceLakeServer - PACKS instructions take latency 3cy

This appears to be a slow down vs Skylake (which the model was copied off) - confirmed with uops.info / instlatx64

Noticed as D138359 was reporting that many of the PACKS overrides were redundant, but were in fact incorrect