Re: i686 quirk for AMD Geode

H. Peter Anvin
2009-11-10T22:37:37Z

On 11/10/2009 02:27 PM, Lennart Sorensen wrote:
> On Tue, Nov 10, 2009 at 01:19:30PM -0800, H. Peter Anvin wrote:
>> Willy, perhaps you can come up with a list of features you think should
>> be emulated, together with an explanation of why you opted for that list
>> of features and *did not* opt for others.
>>
>> Note: emulated FPU is a special subcase. The FPU operations are
>> heavyweight enough that the overhead of trapping versus library calls is
>> relatively insignificant.
>
> That doesn't seem to be the experience of the arm EABI versus the old
> arm ABI with kernel FPU emulation. Using user space library calls for
> FPU is vastly faster than the trapping and kernel FPU emulation.

I don't believe we were talking about ARM.

-hpa