[Bug middle-end/79818] [7 Regression] wrong code with -fwrapv and -Os/-O1/-O2/-O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79818

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Mar  3 08:08:08 2017
New Revision: 245860

URL: https://gcc.gnu.org/viewcvs?rev=245860&root=gcc&view=rev
Log:
2017-03-03  Richard Biener  <rguenther@suse.de>

        PR middle-end/79818
        * match.pd ( X +- C1 CMP C2 -> X CMP C2 -+ C1): Add missing
        TYPE_OVERFLOW_UNDEFINED check.

        * gcc.dg/torture/pr79818.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr79818.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog