[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 #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-29 
14:44:13 UTC ---
Author: rguenth
Date: Tue May 29 14:44:08 2012
New Revision: 187964

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187964
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:
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr53516.c
Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_7-branch/gcc/tree-data-ref.c
    branches/gcc-4_7-branch/gcc/tree-vect-data-refs.c