[all-commits] [llvm/llvm-project] 4a31f7: [ConstantFold] Special case atan +/-0.0 (#143962)

[Lei Huang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a31f7f8ea776383d72350cb5ce74ce13ee15431
      https://github.com/llvm/llvm-project/commit/4a31f7f8ea776383d72350cb5ce74ce13ee15431
  Author: Lei Huang <lei at ca.ibm.com>
  Date:   2025-06-25 (Wed, 25 Jun 2025)

  Changed paths:
    M llvm/lib/Analysis/ConstantFolding.cpp
    M llvm/test/Transforms/InstSimplify/ConstProp/atan-intrinsic.ll
    M llvm/test/Transforms/InstSimplify/ConstProp/calls.ll

  Log Message:
  -----------
   [ConstantFold] Special case atan +/-0.0 (#143962)

C's Annex F specifies that atan +/-0.0 returns the input value;
however, this behavior is optional and host C libraries may behave
differently. This change applies the Annex F behavior to constant
folding by LLVM.

Ref:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/atan.html



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