[Bug middle-end/68870] [6 Regression] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68870

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Dec 16 14:56:10 2015
New Revision: 231695

URL: https://gcc.gnu.org/viewcvs?rev=231695&root=gcc&view=rev
Log:
2015-12-16  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/68870
        * tree-cfgcleanup.c (cleanup_control_expr_graph): Add first_p
        parameter, if set only perform trivial constant folding.
        Queue other blocks with conditions for later processing.
        (cleanup_control_flow_bb): Add first_p parameter and pass it through.
        (cleanup_tree_cfg_1): Pass true for the first iteration
        cleanup_control_expr_graph.

        * gcc.dg/torture/pr68870.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr68870.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-cfgcleanup.c