[Bug tree-optimization/78542] [7 Regression] wrong code at -Og results in endless loop

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78542

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Nov 28 15:03:55 2016
New Revision: 242920

URL: https://gcc.gnu.org/viewcvs?rev=242920&root=gcc&view=rev
Log:
2016-11-28  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/78542
        * tree-ssa-ccp.c (evaluate_stmt): Only valueize simplification
        if allowed.

        * gcc.dg/torture/pr78542.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr78542.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c