[all-commits] [llvm/llvm-project] e9eb2d: [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: e9eb2dc33261ceeda573ae23c606e513f17de48c
      https://github.com/llvm/llvm-project/commit/e9eb2dc33261ceeda573ae23c606e513f17de48c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-08-14 (Fri, 14 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

Recommit of rG9bd97d036398 with fixed offset adjustments