[all-commits] [llvm/llvm-project] a31d20: [X86][SSE] IsElementEquivalent - add HOP(X, X) support

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a31d20e67e2bbdbf5afd72b846f681023ff3bc4c
      https://github.com/llvm/llvm-project/commit/a31d20e67e2bbdbf5afd72b846f681023ff3bc4c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-08-13 (Thu, 13 Aug 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/haddsub-3.ll
    M llvm/test/CodeGen/X86/haddsub-shuf.ll
    M llvm/test/CodeGen/X86/haddsub-undef.ll
    M llvm/test/CodeGen/X86/phaddsub.ll

  Log Message:
  -----------
  [X86][SSE] IsElementEquivalent - add HOP(X,X) support

For HADD/HSUB/PACKS ops with repeated operands the lower/upper half element of each lane are known to be equivalent