internal static v128 SByteToLong(sbyte2 x)
{
if (Sse4_1.IsSse41Supported)
{
return(Sse4_1.cvtepi8_epi64(x));
}
else if (Sse2.IsSse2Supported)
{
v128 sign = Sse2.cmpgt_epi8(default(v128), x);
v128 shorts = Sse2.unpacklo_epi8(x, sign);
sign = Sse2.unpacklo_epi8(sign, sign);
v128 ints = Sse2.unpacklo_epi16(shorts, sign);
sign = Sse2.unpacklo_epi16(sign, sign);
return(Sse2.unpacklo_epi16(ints, sign));
}
else
{
throw new CPUFeatureCheckException();
}
}
