[Bug middle-end/80815] wrong code because of broken runtime alias check in vectorizer

["amker at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80815

--- Comment #5 from amker at gcc dot gnu.org ---
Author: amker
Date: Fri May 26 14:18:26 2017
New Revision: 248512

URL: https://gcc.gnu.org/viewcvs?rev=248512&root=gcc&view=rev
Log:
        PR tree-optimization/80815
        * tree-data-ref.c (prune_runtime_alias_test_list): Simplify condition
        for merging runtime alias checks.  Handle negative DR_STEPs.
        gcc/testsuite
        * gcc.dg/vect/pr80815-1.c: New test.
        * gcc.dg/vect/pr80815-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr80815-1.c
    trunk/gcc/testsuite/gcc.dg/vect/pr80815-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-data-ref.c