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SubjectRe: [cpuops cmpxchg double V1 1/4] Generic support for this_cpu_cmpxchg_double
On 12/24/2010 08:53 PM, Christoph Lameter wrote:
> On Thu, 23 Dec 2010, H. Peter Anvin wrote:
>
>> There are two return registers; two machine registers can be returned in
>> registers. [u]int128 is poorly implemented in a lot of gcc versions,
>> since it really hasn't been exercised. However, two-word structures
>> should work. I do not believe a two-word *array* works, though.
>
> Oh gosh. So we would be using a tight corner case for gcc that may only
> work with certain versions of gcc? Note that the current version does only
> return a boolean. There is no need for returning double words. I'd be
> happy if we could *pass* double words.
>


A structure is not a corner case; a uint128 would be.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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