[Bug rtl-optimization/55740] [4.8 Regression] ICE in verify_loop_structure, at cfgloop.c:1582, error: loop 2's header does not belong directly to it

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55740

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-20 12:45:53 UTC ---
Author: rguenth
Date: Thu Dec 20 12:45:48 2012
New Revision: 194633

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194633
Log:
2012-12-20  Richard Biener  <rguenther@suse.de>

    PR middle-end/55740
    * cfghooks.c (merge_blocks): Properly handle merging of
    two loop headers.

    * g++.dg/torture/pr55740.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr55740.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfghooks.c
    trunk/gcc/testsuite/ChangeLog