https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107160
--- Comment #19 from CVS 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:d282dd56275485a88e1fe9c4ae1939b62d23b20b commit r12-8839-gd282dd56275485a88e1fe9c4ae1939b62d23b20b Author: Richard Biener <rguent...@suse.de> Date: Thu Oct 13 14:24:05 2022 +0200 tree-optimization/107160 - avoid reusing multiple accumulators Epilogue vectorization is not set up to re-use a vectorized accumulator consisting of more than one vector. For non-SLP we always reduce to a single but for SLP that isn't happening. In such case we currenlty miscompile the epilog so avoid this. PR tree-optimization/107160 * tree-vect-loop.cc (vect_create_epilog_for_reduction): Do not register accumulator if we failed to reduce it to a single vector. * gcc.dg/vect/pr107160.c: New testcase. (cherry picked from commit 5cbaf84c191b9a3e3cb26545c808d208bdbf2ab5)
