[all-commits] [llvm/llvm-project] e657b9: [X86] Fold EXTRACT_SUBVECTOR(VPERMV(V, M), C) -> EXT...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e657b96cd89d5a861dd5792e6c067eab405d6033
      https://github.com/llvm/llvm-project/commit/e657b96cd89d5a861dd5792e6c067eab405d6033
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-02-13 (Thu, 13 Feb 2025)

  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 EXTRACT_SUBVECTOR(VPERMV(V,M),C) -> EXTRACT_SUBVECTOR(VPERMV(V,M'),0)

Similar to what we already do for VPERMV3, we can fold the non-zero-idx EXTRACT_SUBVECTOR into the shuffle mask and use a free EXTRACT_SUBVECTOR(V,0) instead



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