https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87974
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Author: rguenth Date: Wed Nov 14 09:19:28 2018 New Revision: 266099 URL: https://gcc.gnu.org/viewcvs?rev=266099&root=gcc&view=rev Log: 2018-11-14 Richard Biener <rguent...@suse.de> PR tree-optimization/87974 * tree-vect-loop.c (vectorizable_reduction): When computing the vectorized reduction PHI vector type ignore constant and external defs. * g++.dg/opt/pr87974.C: New testcase. Added: trunk/gcc/testsuite/g++.dg/opt/pr87974.C Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-vect-loop.c