<fwd from ian taylor's response>
"Jack Andrews" <effbiae@xxxxxxxxx> writes:
simd_mmintrin(n, is)
I *is;
{ __v2si q,r;
I i;
_m_empty();
q=_m_from_int(0);
for (i=0; i < n; i+=W) {
memcpy(&r,is+i,IZ*W);
q=_m_paddd(q,r);
}
I*qq=(I*)&q;
return qq[0]+qq[1];
}
For mmintrin.h functions, use __m64, not __v2si.
Why the memcpy? Use _mm_set_pi32(is[i], is[i + 1]).
Don't extract the values by taking the address of q. Instead do
something like this:
union { long ai[2]; __m64 m } u;
u.m = q;
return u.ai[0] + u.ai[1];
Ian
