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Subject: [Bug target/52080] Stores to bitfields introduce a store-data-race on adjacent data
Date: Wed, 14 Mar 2012 11:01:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52080

--- Comment #13 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-14 10:55:16 UTC ---
Author: rguenth
Date: Wed Mar 14 10:55:09 2012
New Revision: 185379

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185379
Log:
2012-03-14  Richard Guenther  <rguenther@suse.de>

    * tree.h (DECL_BIT_FIELD_REPRESENTATIVE): New define.
    * stor-layout.c (start_bitfield_representative): New function.
    (finish_bitfield_representative): Likewise.
    (finish_bitfield_layout): Likewise.
    (finish_record_layout): Call finish_bitfield_layout.
    * tree.c (free_lang_data_in_decl): Only free DECL_QUALIFIER
    for QUAL_UNION_TYPE fields.
    * tree-streamer-in.c (lto_input_ts_field_decl_tree_pointers):
    Stream DECL_BIT_FIELD_REPRESENTATIVE.
    * tree-streamer-out.c (write_ts_field_decl_tree_pointers): Likewise.

    PR middle-end/52080
    PR middle-end/52097
    PR middle-end/48124
    * expr.c (get_bit_range): Unconditionally extract bitrange
    from DECL_BIT_FIELD_REPRESENTATIVE.
    (expand_assignment): Adjust call to get_bit_range.

    * gcc.dg/torture/pr48124-1.c: New testcase.
    * gcc.dg/torture/pr48124-2.c: Likewise.
    * gcc.dg/torture/pr48124-3.c: Likewise.
    * gcc.dg/torture/pr48124-4.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr48124-1.c
    trunk/gcc/testsuite/gcc.dg/torture/pr48124-2.c
    trunk/gcc/testsuite/gcc.dg/torture/pr48124-3.c
    trunk/gcc/testsuite/gcc.dg/torture/pr48124-4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/stor-layout.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-streamer-in.c
    trunk/gcc/tree-streamer-out.c
    trunk/gcc/tree.c
    trunk/gcc/tree.h