https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121767
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:6acd5534ad3ab6208cda68fddb48eb73260d6508 commit r16-3539-g6acd5534ad3ab6208cda68fddb48eb73260d6508 Author: Richard Biener <rguent...@suse.de> Date: Wed Sep 3 11:04:49 2025 +0200 tree-optimization/121767 - modvar pattern breaking reductions The a % b -> a - a / b pattern breaks reduction constraints, disable it for reduction stmts. PR tree-optimization/121767 * tree-vect-patterns.cc (vect_recog_mod_var_pattern): Disable for reductions. * gcc.dg/vect/pr121767.c: New testcase.