[Bug tree-optimization/80842] [7/8 Regression] ICE at -O3 on x86_64-linux-gnu in "set_lattice_value"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80842

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May 26 07:19:00 2017
New Revision: 248482

URL: https://gcc.gnu.org/viewcvs?rev=248482&root=gcc&view=rev
Log:
2017-05-26  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/80842
        * tree-ssa-ccp.c (set_lattice_value): Always meet with the old
        value.

        * gcc.dg/torture/pr80842.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr80842.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c