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[Bug middle-end/67662] -fsanitize=undefined cries wolf for X - 1 + X when X is 2**30
- 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: Wed, 23 Sep 2015 14:10:19 +0000
- Subject: [Bug middle-end/67662] -fsanitize=undefined cries wolf for X - 1 + X when X is 2**30
- Auto-submitted: auto-generated
- References: <bug-67662-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67662
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Sep 23 14:09:48 2015
New Revision: 228051
URL: https://gcc.gnu.org/viewcvs?rev=228051&root=gcc&view=rev
Log:
2015-09-23 Richard Biener <rguenther@suse.de>
PR middle-end/67662
* fold-const.c (fold_binary_loc): Do not reassociate two vars with
undefined overflow unless they will cancel out.
* gcc.dg/ubsan/pr67662.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/ubsan/pr67662.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog