[all-commits] [llvm/llvm-project] 426db6: [X86] LowerBUILD_VECTOR - fold build_vector(undef, ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 426db6b4eb2e9298598d5c09d27f0cdb27917751
      https://github.com/llvm/llvm-project/commit/426db6b4eb2e9298598d5c09d27f0cdb27917751
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-04-22 (Sat, 22 Apr 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/build-vector-128.ll
    M llvm/test/CodeGen/X86/freeze-vector.ll

  Log Message:
  -----------
  [X86] LowerBUILD_VECTOR - fold build_vector(undef,freeze(undef)) -> freeze(undef)

Noticed while triaging #62286


  Commit: aa84981224e614da95d11ce12770109132c02d41
      https://github.com/llvm/llvm-project/commit/aa84981224e614da95d11ce12770109132c02d41
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-04-22 (Sat, 22 Apr 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/pr62286.ll

  Log Message:
  -----------
  [X86] LowerBUILD_VECTOR - narrow 256/512-bit vector containing undef/freeze(undef)/zero in the upper half

Fixes #62286


Compare: https://github.com/llvm/llvm-project/compare/44baa6558968...aa84981224e6