[Bug tree-optimization/81900] [8 Regression] GCC trunk miscompiles Perl / __sigsetjmp issue

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81900

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug 21 13:18:35 2017
New Revision: 251226

URL: https://gcc.gnu.org/viewcvs?rev=251226&root=gcc&view=rev
Log:
2017-08-21  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/81900
        * tree-ssa-pre.c (compute_antic_aux): Properly compute changed
        for blocks with abnormal predecessors.
        (compute_antic): Do not set visited flag prematurely.

        * gcc.dg/torture/pr81900.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr81900.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c