[Bug tree-optimization/48172] [4.5/4.6/4.7 Regression] incorrect vectorization of loop in GCC 4.5.* with -O3

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48172

--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-12 
12:14:48 UTC ---
Author: rguenth
Date: Thu May 12 12:14:45 2011
New Revision: 173703

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173703
Log:
2011-05-12  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/48172
    * tree-vect-loop-manip.c (vect_vfa_segment_size): Do not exclude
    the number of iterations from the segment size calculation.
    (vect_create_cond_for_alias_checks): Adjust.

    * gcc.dg/vect/pr48172.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr48172.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop-manip.c