[all-commits] [llvm/llvm-project] a4b44c: [InstCombine] Canonicalize `icmp ult (add X, C2), ...

[Antonio Frighetto via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a4b44c003e35bb6ed78af6300e576554d41f0368
      https://github.com/llvm/llvm-project/commit/a4b44c003e35bb6ed78af6300e576554d41f0368
  Author: Antonio Frighetto <me at antoniofrighetto.com>
  Date:   2024-06-17 (Mon, 17 Jun 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
    M llvm/test/Transforms/InstCombine/icmp-add.ll

  Log Message:
  -----------
  [InstCombine] Canonicalize `icmp ult (add X, C2), C` expressions

`icmp ult (add X, C2), C` can be folded to `icmp ne (and X, C), 2C`,
subject to `C == -C2` and C2 being a power of 2.

Proofs: https://alive2.llvm.org/ce/z/P-VVmQ.

Fixes: https://github.com/llvm/llvm-project/issues/75613.



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