[Bug tree-optimization/80974] [8 Regression] wrong code (generated code hangs) at -O2 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80974

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jun  6 12:46:41 2017
New Revision: 248919

URL: https://gcc.gnu.org/viewcvs?rev=248919&root=gcc&view=rev
Log:
2017-06-06  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/80974
        * tree-ssa-sccvn.c (set_ssa_val_to): Do not change but only
        keep or clear leaders SSA info.

        * gcc.dg/torture/pr80974.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr80974.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c