[all-commits] [llvm/llvm-project] 8d2661: [X86] combineConcatVectorOps - concat(rotate(x, a), ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d2661b2d54e9dec96cba72ff5089c6fa7482bf3
      https://github.com/llvm/llvm-project/commit/8d2661b2d54e9dec96cba72ff5089c6fa7482bf3
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2026-06-12 (Fri, 12 Jun 2026)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-shuffle-combining-avx512bwvl.ll
    M llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll

  Log Message:
  -----------
  [X86] combineConcatVectorOps - concat(rotate(x,a),rotate(y,b)) -> rotate(concat(x,y),concat(a,b)) (#203553)

128/256-bit rotates are widened in tablegen, we don't need to limit
these to VLX targets - any AVX512 target can perform these

We already have test coverage to ensure 128-bit XOP rotates don't get
concatenated to 256-bit



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