[Bug tree-optimization/70780] [6/7 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70780

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 25 10:49:55 2016
New Revision: 235407

URL: https://gcc.gnu.org/viewcvs?rev=235407&root=gcc&view=rev
Log:
2016-04-25  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/70780
        * tree-ssa-pre.c (compute_antic_aux): Also return true if the block
        wasn't visited yet.
        (compute_antic): Mark blocks with abnormal preds as visited as
        they have a final empty antic-in solution already.

        * gcc.dg/torture/pr70780.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr70780.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c