[all-commits] [llvm/llvm-project] 302e74: [X86] Improve optimizeCompareInstr for signed comp...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 302e7480655b0d1c1a3a629b4ef446bf77dcb01a
      https://github.com/llvm/llvm-project/commit/302e7480655b0d1c1a3a629b4ef446bf77dcb01a
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-04-07 (Wed, 07 Apr 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86InstrInfo.cpp
    M llvm/test/CodeGen/X86/and-with-overflow.ll
    M llvm/test/CodeGen/X86/or-with-overflow.ll
    M llvm/test/CodeGen/X86/xor-with-overflow.ll

  Log Message:
  -----------
  [X86] Improve optimizeCompareInstr for signed comparisons after AND/OR/XOR instructions

Extend D94856 to handle 'and', 'or' and 'xor' instructions as well

We still fail on many i8/i16 cases as the test and the logic-op are performed on different widths