[all-commits] [llvm/llvm-project] bd034a: [X86] combineX86ShuffleChain - always combine to a...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bd034ab1113cd3705fedf75d870dc4b7388d8f70
      https://github.com/llvm/llvm-project/commit/bd034ab1113cd3705fedf75d870dc4b7388d8f70
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-02-21 (Fri, 21 Feb 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-interleaved-store-i16-stride-7.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i32-stride-7.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-5.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-7.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i8-stride-8.ll

  Log Message:
  -----------
  [X86] combineX86ShuffleChain - always combine to a new VPERMV node if the root shuffle was a VPERMV node (#128183)

Similar to what we already do for VPERMV3 nodes - if we're trying to create a new unary variable shuffle and we started with a VPERMV node then always create a new one if it reduces the shuffle chain depth



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