On 11/17/2010 12:58 AM, Avi Kivity wrote:
>> Actually in this case I'm pretty sure there's already a "set bit"
>> function which will do the job. set_bit(), I guess, though it takes a
>> bit number rather than a mask...
>>
>
>
> set_bit() operates on a long, while the intel manuals recommend
> against operating on operands of different size, especially with
> locked operations. I think newer processors have more relaxed
> requirements, though.
Despite its prototype, set_bit() is pretty specifically using "orb" for
a the constant case, or bts otherwise (I don't know what size memory
operation bts is considered to generate).
J
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