https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123539
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <[email protected]>: https://gcc.gnu.org/g:47d09318c411911408058de38bebc16a177fa8e1 commit r16-6734-g47d09318c411911408058de38bebc16a177fa8e1 Author: Richard Biener <[email protected]> Date: Mon Jan 12 14:10:32 2026 +0100 tree-optimization/123539 - signed UB in vector reduction With previous changes I overlooked one use of vectype. PR tree-optimization/123539 * tree-vect-loop.cc (vect_create_epilog_for_reduction): Use the compute vectype to pun down to smaller or element size for by-element reductions.
