[all-commits] [llvm/llvm-project] 4be35f: [X86] EmitCmp - use existing XOR node to check for...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4be35fd9085b9bb0330c8adb95b47842baa3aaa9
      https://github.com/llvm/llvm-project/commit/4be35fd9085b9bb0330c8adb95b47842baa3aaa9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-02-04 (Tue, 04 Feb 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/cmp-xor.ll
    M llvm/test/CodeGen/X86/pr32284.ll

  Log Message:
  -----------
  [X86] EmitCmp - use existing XOR node to check for equality (#125506)

Normally, we use the result of the SUB flag for scalar comparison as its more compatible with CMP, but if we're testing for equality and already have a XOR we can reuse that instead.

Fixes #6146



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