Hallo
> Oh yeah, this isn't on Linux. OSX probably has some kind of API for
> checking if sse2 is available. Using CPUID isn't enough, because sse
> requires OS support that might not be there. I.e., the cpu supports
> sse2 but you're not actually able to use it. Probably not much of issue
> on OSX.
>
> Easy fix would just be the change the sse detection asm to save and
> restore ebx.
>
> __asm__ volatile("pushl %%ebx ; cpuid ; popl %%ebx" : "=d"(d) : "a"(1) :
> "ecx");
>
> or better
>
> uint32_t tmp;
> __asm__ volatile("movl %%ebx, %1; cpuid; movl %1, %%ebx" : "=d"(d),
> "=&g"(tmp) : "a"(1) : "ecx");
>
> The latter is safer in general, as you can't use push or pop around any
> asm code that has a parameter with a constraint that allows memory
> references. The memory reference might be relative to esp, in which
> case the push/pop would move it. Or it might not be relative to esp, in
> which case the push/pop doesn't move it. So there's no way to adjust
> for it.
I tested your better version. And it compiles here on my linux and Intel
osx box. I did also a quick test with the new version on the linux box.
And it works well.
So I would appreciate a feedback if it works on a mac.
auf hoffentlich bald,
Berni the Chaos of Woodquarter
Email: [email protected]
www: http://www.lysator.liu.se/~gz/bernhard
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