PATCH: Add pause intrinsic

[H.J. Lu]

On Wed, May 25, 2011 at 3:26 AM, Andrew Haley <aph@redhat.com> wrote:
> On 05/24/2011 07:28 PM, H.J. Lu wrote:
>
>> This patch implements pause intrinsic suggested by Andi.  OK
>> for trunk?
>
> What does "full memory barrier" here mean?
>
> +@table @code
> +@item void __builtin_ia32_pause (void)
> +Generates the @code{pause} machine instruction with full memory barrier.
> +@end table
>
> There a memory clobber, but no barrier instruction AFAICS.  The
> doc needs to explain it a bit better.
>

There are read/load memory barrier, write/store memory barrier and full/general
memory barrier.  You can find them at

http://www.kernel.org/doc/Documentation/memory-barriers.txt

Should I include a pointer to it?

-- 
H.J.