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From: "edlinger at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/48784] #pragma pack(1) + -fstrict-volatile-bitfields = bad codegen
Date: Wed, 11 Dec 2013 16:59:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48784

--- Comment #6 from edlinger at gcc dot gnu.org ---
Author: edlinger
Date: Wed Dec 11 16:59:24 2013
New Revision: 205897

URL: http://gcc.gnu.org/viewcvs?rev=205897&root=gcc&view=rev
Log:
2013-12-11  Bernd Edlinger  <bernd.edlinger@hotmail.de>
            Sandra Loosemore  <sandra@codesourcery.com>

        PR middle-end/23623
        PR middle-end/48784
        PR middle-end/56341
        PR middle-end/56997
        * expmed.c (strict_volatile_bitfield_p): Add bitregion_start
        and bitregion_end parameters.  Test for compliance with C++
        memory model.
        (store_bit_field): Adjust call to strict_volatile_bitfield_p.
        Add fallback logic for cases where -fstrict-volatile-bitfields
        is supposed to apply, but cannot.
        (extract_bit_field): Likewise. Use narrow_bit_field_mem and
        extract_fixed_bit_field_1 to do the extraction.
        (extract_fixed_bit_field): Revert to previous mode selection algorithm.
        Call extract_fixed_bit_field_1 to do the real work.
        (extract_fixed_bit_field_1): New function.

testsuite:        
        * gcc.dg/pr23623.c: Update to test interaction with C++
        memory model.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expmed.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr23623.c