[Bug tree-optimization/66917] [4.9/5 regression] ARM: NEON: memcpy compiles to vst1 with incorrect alignment

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66917

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |6.0
            Summary|[4.9/5/6 regression] ARM:   |[4.9/5 regression] ARM:
                   |NEON: memcpy compiles to    |NEON: memcpy compiles to
                   |vst1 with incorrect         |vst1 with incorrect
                   |alignment due to SRA        |alignment
      Known to fail|6.0                         |

--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.

--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug  3 07:13:36 2015
New Revision: 226487

URL: https://gcc.gnu.org/viewcvs?rev=226487&root=gcc&view=rev
Log:
2015-08-03  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/66917
        * tree-vectorizer.h (struct dataref_aux): Add base_element_aligned
        field.
        (DR_VECT_AUX): New macro.
        (set_dr_misalignment): Adjust.
        (dr_misalignment): Likewise.
        * tree-vect-data-refs.c (vect_compute_data_ref_alignment):
        Compute whether the base is at least element aligned.
        * tree-vect-stmts.c (ensure_base_align): Adjust.
        (vectorizable_store): If the base is not element aligned
        preserve alignment of the original access if misalignment is unknown.
        (vectorizable_load): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-stmts.c
    trunk/gcc/tree-vectorizer.h