[all-commits] [llvm/llvm-project] 5ab65a: [X86] VPERM2*128 instructions aren't microcoded on...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ab65a6c1c38eef2a096a6b9231281fb4876c387
      https://github.com/llvm/llvm-project/commit/5ab65a6c1c38eef2a096a6b9231281fb4876c387
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ScheduleZnver2.td
    M llvm/test/tools/llvm-mca/X86/Znver2/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/Znver2/resources-avx2.s

  Log Message:
  -----------
  [X86] VPERM2*128 instructions aren't microcoded on znver2

This appears to be a copy+paste error from znver1 (which isn't really microcoded either - but it is rather complex!).

Confirmed with Agner + uops.info.


  Commit: 9e3e8b5715d01fc7ac6b0bdcd1870f3823f3ab30
      https://github.com/llvm/llvm-project/commit/9e3e8b5715d01fc7ac6b0bdcd1870f3823f3ab30
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ScheduleZnver1.td
    M llvm/test/tools/llvm-mca/X86/Znver1/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/Znver1/resources-avx2.s

  Log Message:
  -----------
  [X86] VPERM2*128 instructions aren't microcoded on znver1

AMD refer to them as microcoded, but not in the same way as LLVM - the uop count and pipe usage is high but predictable

Confirmed with Agner + uops.info.


  Commit: 8b1916b7666ae29c3ca2a196f5d1062e2d51f10f
      https://github.com/llvm/llvm-project/commit/8b1916b7666ae29c3ca2a196f5d1062e2d51f10f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [X86] Cleanup lowerShuffleWithUNPCK/PACK signatures to match (most) other lowerShuffle* methods. NFC.


Compare: https://github.com/llvm/llvm-project/compare/cd60d10a1073...8b1916b7666a

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