[all-commits] [llvm/llvm-project] 52bc81: [X86] combineConcatVectorOps - concat(shuffle(x, y, ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 52bc812a10d14c6c9d704d8a0d52b9a91a9f19bd
      https://github.com/llvm/llvm-project/commit/52bc812a10d14c6c9d704d8a0d52b9a91a9f19bd
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-03-07 (Fri, 07 Mar 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-fshr-128.ll
    M llvm/test/CodeGen/X86/vector-fshr-rot-128.ll
    M llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll

  Log Message:
  -----------
  [X86] combineConcatVectorOps - concat(shuffle(x,y,m1),shuffle(x,y,m2)) -> shuffle(concat(x,x),concat(y,y),m3) on VBMI targets (#130134)

With VBMI we are guaranteed to support cross-lane 256-bit shuffles, so subvector splats should always be cheap.

Fixes #116931



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