[Bug tree-optimization/56764] vect_prune_runtime_alias_test_list not smart enough

[congh at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56764

--- Comment #3 from congh at gcc dot gnu.org ---
Author: congh
Date: Thu Nov  7 19:29:45 2013
New Revision: 204538

URL: http://gcc.gnu.org/viewcvs?rev=204538&root=gcc&view=rev
Log:
2013-11-07  Cong Hou  <co...@google.com>

    PR tree-optimization/56764
    * tree-vect-loop-manip.c (vect_create_cond_for_alias_checks):
      Combine alias checks if it is possible to amortize the runtime
      overhead.  Return the number of alias checks after merging.
      * tree-vect-data-refs.c (vect_prune_runtime_alias_test_list):
        Use the function vect_create_cond_for_alias_checks () to check
        the number of alias checks.

2013-11-07  Cong Hou  <co...@google.com>

        * gcc.dg/vect/vect-alias-check.c: New.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/vect-alias-check.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-loop-manip.c
    trunk/gcc/tree-vectorizer.h