128 bit signed and unsigned integer types

[Weed]

Jason House пишет:
> Walter Bright Wrote:
> 
>> You know, the unimplemented 128 bit integer types.
>>
>> Does anyone have a use for these?
> 
> If that means bitwise operations on them would optimize to SSE instructions, then I would love to see them.

Why it is impossible to use for the description "128 bit int" structure
and an assembly insertion for operations over it?