[Bug tree-optimization/60280] [4.9 Regression] gcc.target/arm/ivopts.c and gcc.target/arm/ivopts-2.c failed caused by preserving loop structure.

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60280

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Feb 28 13:14:23 2014
New Revision: 208222

URL: http://gcc.gnu.org/viewcvs?rev=208222&root=gcc&view=rev
Log:
2014-02-28  Richard Biener  <rguent...@suse.de>

    PR target/60280
    * tree-cfgcleanup.c (tree_forwarder_block_p): Restrict
    previous fix and only allow to remove trivial pre-headers
    and latches.  Also honor LOOPS_MAY_HAVE_MULTIPLE_LATCHES.
    (remove_forwarder_block): Properly update the latch of
    a loop.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-cfgcleanup.c