https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121049
--- Comment #18 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:185a8bae0f2ce46c65ec6a541c2fe7299df6d7f4 commit r15-10001-g185a8bae0f2ce46c65ec6a541c2fe7299df6d7f4 Author: Richard Biener <rguent...@suse.de> Date: Wed Jul 16 15:07:58 2025 +0200 tree-optimization/121049 - avoid loop masking with even/odd reduction The following disables loop masking when we are using an even/odd widening operation in a reduction because the loop mask then aligns to the wrong elements. PR tree-optimization/121049 * internal-fn.h (widening_evenodd_fn_p): Declare. * internal-fn.cc (widening_evenodd_fn_p): New function. * tree-vect-stmts.cc (vectorizable_conversion): When using an even/odd widening function disable loop masking. * gcc.dg/vect/pr121049.c: New testcase. (cherry picked from commit bc5570f7ef796fa7f5ab89b34ed9de2be5299f0e)
