[Bug tree-optimization/103237] [9/10/11 Regression] wrong code with -ftree-vectorize at -O1 on x86_64-linux-gnu starting with r7-1219-gb28ead45fe630b9e
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Nov 22 08:00:54 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103237
--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:fb1bc2c0865f2b15a219e11270b5c5fca565e169
commit r11-9261-gfb1bc2c0865f2b15a219e11270b5c5fca565e169
Author: Richard Biener <rguenther@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 <rguenther@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)
More information about the Gcc-bugs
mailing list