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> -----Original Message-----
> From: Joey Ye [mailto:joey...@arm.com]
> Sent: Thursday, January 16, 2014 16:28
> To: gcc-patches@gcc.gnu.org
> Subject: [PATCH][4.8] Backport strict-volatile-bitfields fixes to 4.8
>
> 4.8 has a number of strict-volatile-bitfields issues that can be fixed by
> following patches.
> trunk@205899, 205898, 205897, 205896, 203003
>
> Tested on x86_64 and arm without regression.
>
> OK to 4.8?
>
> 2013-09-28 Sandra Loosemore <san...@codesourcery.com>
>
> gcc/
> * expr.h (extract_bit_field): Remove packedp parameter.
> * expmed.c (extract_fixed_bit_field): Remove packedp parameter
> from forward declaration.
> (store_split_bit_field): Remove packedp arg from calls to
> extract_fixed_bit_field.
> (extract_bit_field_1): Remove packedp parameter and packedp
> argument from recursive calls and calls to
extract_fixed_bit_field.
> (extract_bit_field): Remove packedp parameter and corresponding
> arg to extract_bit_field_1.
> (extract_fixed_bit_field): Remove packedp parameter. Remove code
> to issue warnings.
> (extract_split_bit_field): Remove packedp arg from call to
> extract_fixed_bit_field.
> * expr.c (emit_group_load_1): Adjust calls to extract_bit_field.
> (copy_blkmode_from_reg): Likewise.
> (copy_blkmode_to_reg): Likewise.
> (read_complex_part): Likewise.
> (store_field): Likewise.
> (expand_expr_real_1): Likewise.
> * calls.c (store_unaligned_arguments_into_pseudos): Adjust call
> to extract_bit_field.
> * config/tilegx/tilegx.c (tilegx_expand_unaligned_load): Adjust
> call to extract_bit_field.
> * config/tilepro/tilepro.c (tilepro_expand_unaligned_load): Adjust
> call to extract_bit_field.
> * doc/invoke.texi (Code Gen Options): Remove mention of warnings
> and special packedp behavior from -fstrict-volatile-bitfields
> documentation.
>
> 2013-12-11 Bernd Edlinger <bernd.edlin...@hotmail.de>
>
> * expr.c (expand_assignment): Remove dependency on
> flag_strict_volatile_bitfields. Always set the memory
> access mode.
> (expand_expr_real_1): Likewise.
>
> 2013-12-11 Sandra Loosemore <san...@codesourcery.com>
>
> PR middle-end/23623
> PR middle-end/48784
> PR middle-end/56341
> PR middle-end/56997
>
> gcc/
> * expmed.c (strict_volatile_bitfield_p): New function.
> (store_bit_field_1): Don't special-case strict volatile
> bitfields here.
> (store_bit_field): Handle strict volatile bitfields here instead.
> (store_fixed_bit_field): Don't special-case strict volatile
> bitfields here.
> (extract_bit_field_1): Don't special-case strict volatile
> bitfields here.
> (extract_bit_field): Handle strict volatile bitfields here
instead.
> (extract_fixed_bit_field): Don't special-case strict volatile
> bitfields here. Simplify surrounding code to resemble that in
> store_fixed_bit_field.
> * doc/invoke.texi (Code Gen Options): Update
> -fstrict-volatile-bitfields description.
>
> gcc/testsuite/
> * gcc.dg/pr23623.c: New test.
> * gcc.dg/pr48784-1.c: New test.
> * gcc.dg/pr48784-2.c: New test.
> * gcc.dg/pr56341-1.c: New test.
> * gcc.dg/pr56341-2.c: New test.
> * gcc.dg/pr56997-1.c: New test.
> * gcc.dg/pr56997-2.c: New test.
> * gcc.dg/pr56997-3.c: New test.
>
> 2013-12-11 Bernd Edlinger <bernd.edlin...@hotmail.de>
> Sandra Loosemore <san...@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.
>
> 2013-12-11 Bernd Edlinger <bernd.edlin...@hotmail.de>
>
> PR middle-end/59134
> * expmed.c (store_bit_field): Use narrow_bit_field_mem and
> store_fixed_bit_field_1 for -fstrict-volatile-bitfields.
> (store_fixed_bit_field): Split up. Call store_fixed_bit_field_1
> to do the real work.
> (store_fixed_bit_field_1): New function.
> (store_split_bit_field): Limit the unit size to the memory mode
size,
> to prevent recursion.
>
> testsuite:
> * gcc.c-torture/compile/pr59134.c: New test.
> * gnat.dg/misaligned_volatile.adb: New test.
>
>
>
