[all-commits] [llvm/llvm-project] 70bd80: [X86] combineTargetShuffle - commute VPERMV3 shuff...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 70bd80dc51b62453210f6203c31ea826dd0675c2
      https://github.com/llvm/llvm-project/commit/70bd80dc51b62453210f6203c31ea826dd0675c2
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-11-23 (Sat, 23 Nov 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512-shuffles/partial_permute.ll
    M llvm/test/CodeGen/X86/vector-shuffle-v1.ll

  Log Message:
  -----------
  [X86] combineTargetShuffle - commute VPERMV3 shuffles so any load is on the RHS

This helps ensure we lower to VPERMI2/T2 instructions that we can commute the index arg to VPERMT2/I2.

Similar to 1e31a4529244ead9f12abed524f33a48515abee2 to handle cases where the one use load appears after further folding (keep the lowerShuffleWithPERMV version as this can handle the non-VLX widening case as well).



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