On Thu, Oct 14, 2010 at 2:43 PM, Christian Ebert <blacktr...@gmx.net> wrote:
> * Bernhard Praschinger on Thursday, October 14, 2010 at 19:06:33 +0200
> >> 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.
>
> Thanks for looking into this, but I get:
>
> gcc -DHAVE_CONFIG_H -I. -I.. -I.. -I../utils -O3 -funroll-all-loops
> -ffast-math -march=nocona -mtune=nocona -g -O2 -I/sw/include -no-cpp-precomp
> -D_THREAD_SAFE -Wall -Wunused -MT main.o -MD -MP -MF .deps/main.Tpo -c -o
> main.o main.c
> main.c: In function ‘main’:
> main.c:1339: error: PIC register ‘ebx’ clobbered in ‘asm’
> make: *** [main.o] Error 1
>
Looks like you didn't actually change the needed lines.
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