[all-commits] [llvm/llvm-project] 9bd97d: [X86][SSE] Fold HOP(SHUFFLE(X), SHUFFLE(Y)) --> SHU...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9bd97d0363987b582e4a92b354b02e86ac068407
      https://github.com/llvm/llvm-project/commit/9bd97d0363987b582e4a92b354b02e86ac068407
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-08-12 (Wed, 12 Aug 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/haddsub-shuf.ll
    M llvm/test/CodeGen/X86/haddsub-undef.ll

  Log Message:
  -----------
  [X86][SSE] Fold HOP(SHUFFLE(X),SHUFFLE(Y)) --> SHUFFLE(HOP(X,Y))

This is beginning to look like a canonicalization stage that could be performed as part of shuffle combining

Another step towards PR41813