[Bug tree-optimization/79666] [5/6/7 Regression] wrong code (SIGFPE) at -O2 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79666

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Feb 22 12:11:27 2017
New Revision: 245648

URL: https://gcc.gnu.org/viewcvs?rev=245648&root=gcc&view=rev
Log:
2017-02-22  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/79666
        * tree-vrp.c (extract_range_from_binary_expr_1): Make sure
        to not symbolically negate if that may introduce undefined
        overflow.

        * gcc.dg/torture/pr79666.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr79666.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c