[all-commits] [llvm/llvm-project] 178e9c: [X86] combine-pmaddwd.ll - add test showing poor c...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 178e9ce6ffe031466e0593aede0d5cdf8dd59ec5
      https://github.com/llvm/llvm-project/commit/178e9ce6ffe031466e0593aede0d5cdf8dd59ec5
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2026-07-09 (Thu, 09 Jul 2026)

  Changed paths:
    M llvm/test/CodeGen/X86/combine-pmaddwd.ll

  Log Message:
  -----------
  [X86] combine-pmaddwd.ll - add test showing poor codegen when trying to add together VPMADDWD pairs (#208457)

Shows current limitations of combineAddOfPMADDWD - only handles 128-bit
vectors, and the shuffle pattern it generates can be really poor on SSE
targets



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