On Mon, 27 Mar 2000, Oliver Xymoron wrote:
> On Mon, 27 Mar 2000, David Konerding wrote:
>
> > But the following code just gives a segfault. Am I missing something from my
> > KNI code?
> >
> > int a=5;
> > int test2() {
> > __asm__("movq 0x00(%0), %%mm0\n\t"
> > "movq 0x08(%0), %%mm1\n\t"
> > "movq 0x10(%0), %%mm2\n\t"
> > "movq 0x18(%0), %%mm3\n\t"
> > :: "r" (a));
> > }
>
> Uh, you seem to be treating "a" as a pointer, so you're dereferencing
> something in small-offset-from-null-pointer-land.
Not to mention that the above is all mmx based code, not KNI based code,
and should run on any processor with mmx registers. This should work
better as a test:
unsigner char a[64];
int test2() {
__asm__("movups 0x00(%0), %%xmm0\n\t"
"movups 0x10(%0), %%xmm1\n\t"
"movups 0x20(%0), %%xmm2\n\t"
"movups 0x30(%0), %%xmm3\n\t"
:: "r" (&a[0]));
--
Doug Ledford <dledford@redhat.com>
Opinions expressed are my own, but
they should be everybody's.
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