[all-commits] [llvm/llvm-project] 2c0b88: [X86] combineX86ShuffleChain - prefer combining to...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2c0b888359c6c5976054bb423ba1d7b37bae9f1a
      https://github.com/llvm/llvm-project/commit/2c0b888359c6c5976054bb423ba1d7b37bae9f1a
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-04-01 (Tue, 01 Apr 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-7.ll

  Log Message:
  -----------
  [X86] combineX86ShuffleChain - prefer combining to X86ISD::SHUF128 if PERMQ operands are splittable (#133900)

If the 512-bit unary shuffle is a concatenation of 128/256-bit subvectors then we're better off using a X86ISD::SHUF128 node so we can fold the concatenation into the shuffle as well.



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