[Bug middle-end/56956] ftrapv traps on valid abs-like code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56956

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Oct 29 08:21:50 2015
New Revision: 229517

URL: https://gcc.gnu.org/viewcvs?rev=229517&root=gcc&view=rev
Log:
2015-10-29  Richard Biener  <rguent...@suse.de>

        PR middle-end/56956
        * fold-const.c (fold_cond_expr_with_comparison): Do not fold
        unsigned conditonal negation to ABS_EXPR.

        * c-c++-common/ubsan/pr56956.c: New testcase.

Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/pr56956.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog