https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103237
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:68c80396906ab10051a69a2181e114c61dd4ee8a commit r9-9954-g68c80396906ab10051a69a2181e114c61dd4ee8a Author: Richard Biener <rguent...@suse.de> Date: Mon Nov 15 11:37:56 2021 +0100 tree-optimization/103237 - avoid vectorizing unhandled double reductions Double reductions which have multiple LC PHIs in the inner loop are not handled correctly during transformation since those PHIs are not properly classified as reduction. The following disables vectorizing them. 2021-11-15 Richard Biener <rguent...@suse.de> PR tree-optimization/103237 * tree-vect-loop.c (vect_is_simple_reduction): Fail for double reductions with multiple inner loop LC PHI nodes. * gcc.dg/torture/pr103237.c: New testcase. (cherry picked from commit 220bd61874cf114667b44f9ded76ed0639eb278b)
