[all-commits] [llvm/llvm-project] 4b529f: [X86] Fold extractsubvector(permv3(src0, mask, src1)...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b529f840c7a28245f4462d9fde34f1686e96351
      https://github.com/llvm/llvm-project/commit/4b529f840c7a28245f4462d9fde34f1686e96351
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-09-18 (Wed, 18 Sep 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-interleaved-load-i32-stride-7.ll
    M llvm/test/CodeGen/X86/vector-interleaved-load-i32-stride-8.ll

  Log Message:
  -----------
  [X86] Fold extractsubvector(permv3(src0,mask,src1),c) -> extractsubvector(permv3(src0,widensubvector(extractsubvector(mask,c)),src1),0) iff c != 0

For cross-lane shuffles, extract the mask operand (uppper) subvector directly, and make use of the free implicit extraction of the lowest subvector of the result.



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