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. Diff: --- gcc/tree-vect-loop.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index 033396417504..74eecb832e6f 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -6000,7 +6000,7 @@ vect_create_epilog_for_reduction (loop_vec_info loop_vinfo, && (mode1 = targetm.vectorize.split_reduction (mode)) != mode) nunits1 = GET_MODE_NUNITS (mode1).to_constant (); - tree vectype1 = vectype; + tree vectype1 = compute_vectype; if (mode1 != mode) { vectype1 = get_related_vectype_for_scalar_type (TYPE_MODE (vectype),
