https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125774
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-16 branch has been updated by Andrew Pinski <[email protected]>: https://gcc.gnu.org/g:8f163f4027736e98af0128b302ae8df49252a70b commit r16-9120-g8f163f4027736e98af0128b302ae8df49252a70b Author: Andrew Pinski <[email protected]> Date: Sat Jun 13 14:42:30 2026 -0700 range fold: Fix relation folding of |/& when reversed operands [PR125774] This showed up in GCC 13 in the original testcase but became latent in GCC 14. So I created a simple gimple testcase to show the issue. So what we have is: _21 = _20 > lower_9; _22 = lower_9 > _20; _23 = _21 | _22; And this would incorrectly be folded into 1 and that is because we treated one of those `>` as `<=` rather than as just `<`. This was due to an incorrect use of relation_negate rather than relation_swap when dealing with swapping the operands. Pushed as obvious after a bootstrap/test on x86_64-linux-gnu. PR tree-optimization/125774 gcc/ChangeLog: * gimple-range-fold.cc (fold_using_range::relation_fold_and_or): Use relation_swap rather than relation_negate when the operands are exchanged. gcc/testsuite/ChangeLog: * gcc.dg/torture/pr125774-1.c: New test. Signed-off-by: Andrew Pinski <[email protected]> (cherry picked from commit 905d407ee4b23c749fa00d0cf3b0aed551a07f36)
