[all-commits] [llvm/llvm-project] 747214: [X86] getFauxShuffleMask - OR(BITCAST(SHUFFLE()), B...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 747214e59be67ec1088de2f9db5d46607bb59565
      https://github.com/llvm/llvm-project/commit/747214e59be67ec1088de2f9db5d46607bb59565
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-04-09 (Wed, 09 Apr 2025)

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

  Log Message:
  -----------
  [X86] getFauxShuffleMask - OR(BITCAST(SHUFFLE()),BITCAST(SHUFFLE())) patterns should return bitcasted source values (#134993)

Noticed while investigating #133947 regressions - if we peek through
bitcasts we can lose track of oneuse/combined nodes in shuffle combining

Currently the same codegen as combineX86ShufflesRecursively still peeks
through the bitcasts itself, but we will soon handle this consistently
as another part of #133947



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