https://gcc.gnu.org/g:19258ca1b85bc15e3a49054eff209f4f0d1c5bee
commit r15-1392-g19258ca1b85bc15e3a49054eff209f4f0d1c5bee Author: Richard Biener <rguent...@suse.de> Date: Mon Jun 17 16:01:15 2024 +0200 tree-optimization/115493 - fix wrong code with SLP induction cond reduction The following fixes a bad final value being used when doing single-lane SLP integer induction cond reduction vectorization. PR tree-optimization/115493 * tree-vect-loop.cc (vect_create_epilog_for_reduction): Use the first scalar result. Diff: --- gcc/tree-vect-loop.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index d9a2ad694843..7c79e9da1060 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -6843,8 +6843,8 @@ vect_create_epilog_for_reduction (loop_vec_info loop_vinfo, with the original initial value, unless induc_val is the same as initial_def already. */ tree zcompare = make_ssa_name (boolean_type_node); - epilog_stmt = gimple_build_assign (zcompare, EQ_EXPR, new_temp, - induc_val); + epilog_stmt = gimple_build_assign (zcompare, EQ_EXPR, + scalar_results[0], induc_val); gsi_insert_before (&exit_gsi, epilog_stmt, GSI_SAME_STMT); tree initial_def = reduc_info->reduc_initial_values[0]; tree tmp = make_ssa_name (new_scalar_dest);