[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 #5 from congh at gcc dot gnu.org ---
Author: congh
Date: Thu Nov 14 21:51:07 2013
New Revision: 204825

URL: http://gcc.gnu.org/viewcvs?rev=204825&root=gcc&view=rev
Log:
2013-11-14  Cong Hou  <congh@google.com>

    Backport from mainline
    2013-11-14  Cong Hou  <congh@google.com>

    * tree-vectorizer.h (struct dr_with_seg_len): Remove the base
    address field as it can be obtained from dr.  Rename the struct.
    * tree-vect-data-refs.c (comp_dr_with_seg_len_pair): Consider
    steps of data references during sort.
    (vect_prune_runtime_alias_test_list): Adjust with the change to
    struct dr_with_seg_len.
    * tree-vect-loop-manip.c (vect_create_cond_for_alias_checks):
    Adjust with the change to struct dr_with_seg_len.

    2013-11-07  Cong Hou  <congh@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.


Modified:
    branches/google/gcc-4_8/gcc/ChangeLog
    branches/google/gcc-4_8/gcc/tree-vect-data-refs.c
    branches/google/gcc-4_8/gcc/tree-vect-loop-manip.c
    branches/google/gcc-4_8/gcc/tree-vectorizer.h