[Bug tree-optimization/70623] [4.9/5/6 Regression] ICE in compute_antic at -O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70623

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Apr 14 07:30:53 2016
New Revision: 234970

URL: https://gcc.gnu.org/viewcvs?rev=234970&root=gcc&view=rev
Log:
2016-04-14  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/70623
        * tree-ssa-pre.c (changed_blocks): Make global ...
        (compute_antic): ... local here.  Move and fix worklist
        handling here.  Do not clear EDGE_DFS_BACK or call mark_dfs_back_edges.
        (compute_antic_aux): Add dumping for MAX assumed succs.  Remove
        worklist handling, dump when ANTIC_IN changed.
        (compute_partial_antic_aux): Remove worklist handling.
        (init_pre): Do not compute post dominators.  Add a comment about
        the CFG order chosen.
        (fini_pre): Do not free post dominators.

        * gcc.dg/torture/pr70623.c: New testcase.
        * gcc.dg/torture/pr70623-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr70623-2.c
    trunk/gcc/testsuite/gcc.dg/torture/pr70623.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c