internal static v128 UIntToLong(v128 x) { if (Sse4_1.IsSse41Supported) { return(Sse4_1.cvtepu32_epi64(x)); } else if (Sse2.IsSse2Supported) { return(Sse2.unpacklo_epi32(x, default(v128))); } else { throw new CPUFeatureCheckException(); } }