[Bug tree-optimization/63341] [4.8/4.9/5 Regression] Vectorization miscompilation with -mcpu=power7

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63341

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Sep 25 08:19:14 2014
New Revision: 215587

URL: https://gcc.gnu.org/viewcvs?rev=215587&root=gcc&view=rev
Log:
    PR tree-optimization/63341
    * tree-vectorizer.h (vect_create_data_ref_ptr,
    vect_create_addr_base_for_vector_ref): Add another tree argument
    defaulting to NULL_TREE.
    * tree-vect-data-refs.c (vect_create_data_ref_ptr): Add byte_offset
    argument, pass it down to vect_create_addr_base_for_vector_ref.
    (vect_create_addr_base_for_vector_ref): Add byte_offset argument,
    add that to base_offset too if non-NULL.
    * tree-vect-stmts.c (vectorizable_load): Add byte_offset variable,
    for dr_explicit_realign_optimized set it to vector byte size
    - 1 instead of setting offset, pass byte_offset down to
    vect_create_data_ref_ptr.

    * gcc.dg/vect/pr63341-1.c: New test.
    * gcc.dg/vect/pr63341-2.c: New test.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/vect/pr63341-1.c
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/vect/pr63341-2.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/tree-vect-data-refs.c
    branches/gcc-4_8-branch/gcc/tree-vect-stmts.c
    branches/gcc-4_8-branch/gcc/tree-vectorizer.h