[all-commits] [llvm/llvm-project] d13947: [InstCombine] Enable more fabs fold when the user ...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d13947bd6caf442151a4b3f51e3e8b226c490535
      https://github.com/llvm/llvm-project/commit/d13947bd6caf442151a4b3f51e3e8b226c490535
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2025-05-21 (Wed, 21 May 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
    M llvm/test/Transforms/InstCombine/fabs.ll
    M llvm/test/Transforms/InstCombine/fneg.ll

  Log Message:
  -----------
  [InstCombine] Enable more fabs fold when the user ignores sign bit of zero/NaN (#139861)

When the only user of select is a fcmp or a fp operation with nnan/nsz,
the sign bit of zero/NaN can be ignored.
Alive2: https://alive2.llvm.org/ce/z/ZcxeIv

Compile-time impact:
https://llvm-compile-time-tracker.com/compare.php?from=7add1bcd02b1f72d580bb2e64a1fe4a8bdc085d9&to=cb419c7cbddce778673f3d4b414ed9b8064b8d6e&stat=instructions:u

Closes https://github.com/llvm/llvm-project/issues/133367.



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