[Bug tree-optimization/78312] [7 Regression] wrong code probably due to VRP of multiplication

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78312

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Nov 14 10:33:15 2016
New Revision: 242380

URL: https://gcc.gnu.org/viewcvs?rev=242380&root=gcc&view=rev
Log:
2016-11-14  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/78312
        * gimple-ssa-backprop.c (backprop::prepare_change): Reset
        flow-sensitive info.

        * gcc.dg/torture/pr78312.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr78312.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-backprop.c
    trunk/gcc/testsuite/ChangeLog