internal static v128 mul_long(v128 left, v128 right)
{
if (Sse4_1.IsSse41Supported)
{
v128 product_Hi = Sse2.mul_epu32(left, right);
v128 product_Lo = Sse4_1.mullo_epi32(left, Sse2.shuffle_epi32(right, Sse.SHUFFLE(2, 3, 0, 1)));
product_Lo = Ssse3.hadd_epi32(product_Lo, default(v128));
product_Lo = Sse2.shuffle_epi32(product_Lo, Sse.SHUFFLE(1, 3, 0, 3));
return(Sse2.add_epi64(product_Lo, product_Hi));
}
else if (Sse2.IsSse2Supported)
{
v128 ac = Sse2.mul_epu32(left, right);
v128 b = Sse2.srli_epi64(left, 32);
v128 bc = Sse2.mul_epu32(b, right);
v128 d = Sse2.srli_epi64(right, 32);
v128 ad = Sse2.mul_epu32(left, d);
v128 hi = Sse2.add_epi64(bc, ad);
hi = Sse2.slli_epi64(hi, 32);
return(Sse2.add_epi64(hi, ac));
}
else
{
throw new CPUFeatureCheckException();
}
}