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[Bug middle-end/56917] -ftrapv detects a overflow wrongly.
- From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 04 Dec 2014 19:20:44 +0000
- Subject: [Bug middle-end/56917] -ftrapv detects a overflow wrongly.
- Auto-submitted: auto-generated
- References: <bug-56917-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56917
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Thu Dec 4 19:20:12 2014
New Revision: 218395
URL: https://gcc.gnu.org/viewcvs?rev=218395&root=gcc&view=rev
Log:
PR middle-end/56917
* fold-const.c (fold_unary_loc): Perform the negation in A's type
when transforming ~ (A - 1) or ~ (A + -1) to -A.
* c-c++-common/ubsan/pr56917.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/ubsan/pr56917.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog