[all-commits] [llvm/llvm-project] cc995a: [InstSimpify] Simplifying `(xor (sub C_Mask, X), C...

[goldsteinn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc995ad064ffe22566270fe95e974a368c71ba22
      https://github.com/llvm/llvm-project/commit/cc995ad064ffe22566270fe95e974a368c71ba22
  Author: goldsteinn <35538541+goldsteinn at users.noreply.github.com>
  Date:   2025-01-11 (Sat, 11 Jan 2025)

  Changed paths:
    M llvm/lib/Analysis/InstructionSimplify.cpp
    A llvm/test/Transforms/InstSimplify/subnuw-with-xor.ll

  Log Message:
  -----------
  [InstSimpify] Simplifying `(xor (sub C_Mask, X), C_Mask)` -> `X` (#122552)

- **[InstSimpify] Add tests for simplifying `(xor (sub C_Mask, X),
C_Mask)`; NFC**
- **[InstSimpify] Simplifying `(xor (sub C_Mask, X), C_Mask)` -> `X`**

Helps address regressions with folding `clz(Pow2)`.

Proof: https://alive2.llvm.org/ce/z/zGwUBp



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