This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/45764] [4.6 Regression] wrong code -O2 vs -O3 (problem in vectorizer???)
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 21 Oct 2010 11:11:08 +0000
- Subject: [Bug tree-optimization/45764] [4.6 Regression] wrong code -O2 vs -O3 (problem in vectorizer???)
- Auto-submitted: auto-generated
- References: <bug-45764-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45764
--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-21 11:10:45 UTC ---
Author: rguenth
Date: Thu Oct 21 11:10:41 2010
New Revision: 165768
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165768
Log:
2010-10-21 Richard Guenther <rguenther@suse.de>
Michael Matz <matz@suse.de>
PR tree-optimization/45764
* tree-vect-data-refs.c (vect_compute_data_ref_alignment):
Adjust initial misalignment for negative DR_STEP.
(vect_find_same_alignment_drs): Two DRs with different DR_STEP
do not have the same alignment over the whole iteration domain.
* gcc.dg/torture/pr45764.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr45764.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-data-refs.c