On 18 July 2012 07:51, Nick Clifton <ni...@redhat.com> wrote:
> Hi Guys,
>
> I am checking in this patch to the mainline to document the ARM port's
> -munaligned-access command line option.
Could you ask if RM's object to backporting this to the 4.7 branch. ?
Thanks,
ramana
>
> Cheers
> Nick
>
> gcc/ChangeLog
> 2012-07-18 Nick Clifton <ni...@redhat.com>
>
> * doc/invoke.texi (ARM Options): Document -munaligned-access.
>
> Index: gcc/doc/invoke.texi
> ===================================================================
> --- gcc/doc/invoke.texi (revision 189603)
> +++ gcc/doc/invoke.texi (working copy)
> @@ -497,7 +497,8 @@
> -mcaller-super-interworking -mcallee-super-interworking @gol
> -mtp=@var{name} -mtls-dialect=@var{dialect} @gol
> -mword-relocations @gol
> --mfix-cortex-m3-ldrd}
> +-mfix-cortex-m3-ldrd @gol
> +-munaligned-access}
>
> @emph{AVR Options}
> @gccoptlist{-mmcu=@var{mcu} -maccumulate-args -mbranch-cost=@var{cost} @gol
> @@ -11049,6 +11050,23 @@
> generating these instructions. This option is enabled by default when
> @option{-mcpu=cortex-m3} is specified.
>
> +@item -munaligned-access
> +@itemx -mno-unaligned-access
> +@opindex munaligned-access
> +@opindex mno-unaligned-access
> +Enables (or disables) reading and writing of 16- and 32- bit values
> +from addresses that are not 16- or 32- bit aligned. By default
> +unaligned access is disabled for all pre-ARMv6 and all ARMv6-M
> +architectures, and enabled for all other architectures. If unaligned
> +access is not enabled then words in packed data structures will be
> +accessed a byte at a time.
> +
> +The ARM attribute @code{Tag_CPU_unaligned_access} will be set in the
> +generated object file to either true or false, depending upon the
> +setting of this option. If unaligned access is enabled then the
> +preprocessor symbol @code{__ARM_FEATURE_UNALIGNED} will also be
> +defined.
> +
> @end table
>
> @node AVR Options
