>On Wed, 26 May 1999, Pavel Machek wrote:
>
>>You could do even more clever trick, something like
>>
>> if (!current->used_math) {
>> unlazy_fpu(current);
>> mmx_checksum();
>> } else normal_checksum();
>>
>>is pretty easy to do, yet it should work _very_ well.
>
>Hmm, it looks ok to me.
Ah, I overlooked the implementation. What we care is to only run mmx if
there is no FPU data to clobber (but we can run mmx even if the current
task used math in some previous timeslice). So the right implementation
should be this according to me:
if (!(current->flags & PF_USEDFPU))
checksum_mmx();
else
checksum_nommx();
Andrea Arcangeli
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