[all-commits] [llvm/llvm-project] 64eea3: [X86] combineEXTEND_VECTOR_INREG - don't attempt t...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 64eea34420e3ee1f6f91a57a72b2edf6f65d6ea7
      https://github.com/llvm/llvm-project/commit/64eea34420e3ee1f6f91a57a72b2edf6f65d6ea7
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-06-13 (Mon, 13 Jun 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/is_fpclass.ll
    M llvm/test/CodeGen/X86/madd.ll
    M llvm/test/CodeGen/X86/mulvi32.ll
    M llvm/test/CodeGen/X86/pmaddubsw.ll
    M llvm/test/CodeGen/X86/promote-cmp.ll
    M llvm/test/CodeGen/X86/vector-trunc-math.ll

  Log Message:
  -----------
  [X86] combineEXTEND_VECTOR_INREG - don't attempt to shuffle combine ANY_EXTEND_VECTOR_INREG without SSE41

Without SSE41, ANY_EXTEND_VECTOR_INREG nodes are likely to be prematurely combined to a target shuffle preventing generic sign extension folds.

Fixes a number of sign-extend regressions in D127115.