internal static v128 IntToLong(v128 x) { if (Sse4_1.IsSse41Supported) { return(Sse4_1.cvtepi32_epi64(x)); } else if (Sse2.IsSse2Supported) { return(Sse2.unpacklo_epi32(x, Sse2.cmpgt_epi32(default(v128), x))); } else { throw new CPUFeatureCheckException(); } }