[all-commits] [llvm/llvm-project] 4b3831: [X86] combineConcatVectorOps - support concatenati...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b383107fa7585bb5ecd7f03cab7800b33d1585a
      https://github.com/llvm/llvm-project/commit/4b383107fa7585bb5ecd7f03cab7800b33d1585a
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-08-29 (Tue, 29 Aug 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/widen_bitcnt.ll

  Log Message:
  -----------
  [X86] combineConcatVectorOps - support concatenation of 128->256-bit X86ISD::PCMPEQ/PCMPGT nodes on AVX2+ targets

Only bother if one of the ops is free to concat (most likely compare with constant).