https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115669
--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:882f7e53a7664f2c76b10dc020e720ba9f55f022 commit r12-10894-g882f7e53a7664f2c76b10dc020e720ba9f55f022 Author: Richard Biener <rguent...@suse.de> Date: Thu Jun 27 11:26:08 2024 +0200 tree-optimization/115669 - fix SLP reduction association The following avoids associating a reduction path as that might get STMT_VINFO_REDUC_IDX out-of-sync with the SLP operand order. This is a latent issue with SLP reductions but now easily exposed as we're doing single-lane SLP reductions. When we achieved SLP only we can move and update this meta-data. PR tree-optimization/115669 * tree-vect-slp.cc (vect_build_slp_tree_2): Do not reassociate chains that participate in a reduction. * gcc.dg/vect/pr115669.c: New testcase. (cherry picked from commit 7886830bb45c4f5dca0496d4deae9a45204d78f5)
