[Bug tree-optimization/68379] [6 Regression] BB vectorization: definition in block 13 follows the use for SSA_NAME

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68379

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Dec  1 14:24:54 2015
New Revision: 231111

URL: https://gcc.gnu.org/viewcvs?rev=231111&root=gcc&view=rev
Log:
2015-12-01  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/68379
        * tree-vect-stmts.c (vectorizable_load): For BB vectorization
        always base loads on the first used DR of a group.
        * tree-vect-data-refs.c (vect_slp_analyze_and_verify_node_alignment):
        Compute alignment of the first scalar element unconditionally.

        * gcc.dg/torture/pr68379.c: New testcase.
        * gfortran.dg/pr68379-1.f90: Likewise.
        * gfortran.dg/pr68379-2.f: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr68379.c
    trunk/gcc/testsuite/gfortran.dg/pr68379-1.f90
    trunk/gcc/testsuite/gfortran.dg/pr68379-2.f
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-stmts.c