[Bug tree-optimization/53516] [4.6/4.7/4.8 Regression] Vectorization and memset recognition miscompile bitfield stores

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53516

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-29 
14:40:23 UTC ---
Author: rguenth
Date: Tue May 29 14:40:16 2012
New Revision: 187961

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187961
Log:
2012-05-29  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/53516
    * tree-data-ref.c (stmt_with_adjacent_zero_store_dr_p): Reject
    bitfield accesses.
    * tree-vect-data-refs.c (vect_analyze_data_refs): Likewise.

    * gcc.dg/torture/pr53516.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr53516.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-data-ref.c
    trunk/gcc/tree-vect-data-refs.c