[Bug tree-optimization/89595] [8/9 Regression] DOM miscompiles code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89595

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar  7 12:46:44 2019
New Revision: 269453

URL: https://gcc.gnu.org/viewcvs?rev=269453&root=gcc&view=rev
Log:
2019-03-07  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/89595
        * tree-ssa-dom.c (dom_opt_dom_walker::optimize_stmt): Take
        stmt iterator as reference, take boolean output parameter to
        indicate whether the stmt was removed and thus the iterator
        already advanced.
        (dom_opt_dom_walker::before_dom_children): Re-iterate over
        stmts created by folding.

        * gcc.dg/torture/pr89595.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr89595.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c