[Bug middle-end/78228] [6/7 Regression] fstrict-overflow breaks code without overflow?

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78228

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Nov  7 12:25:09 2016
New Revision: 241899

URL: https://gcc.gnu.org/viewcvs?rev=241899&root=gcc&view=rev
Log:
2016-11-07  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/78228
        * tree-ssa-phiopt.c (abs_replacement): Avoid introducing
        undefined behavior.

        * gcc.dg/tree-ssa/phi-opt-15.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/phi-opt-15.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-phiopt.c