NASM 2.05 based x86 Instruction Reference[ch349]
A.5.323 UNPCKHPS: Unpack and Interleave High Packed Single-Precision FP Values UNPCKHPS xmm1,xmm2/m128 ; 0F 15 /r [KATMAI,SSE] UNPCKHPS performs an interleaved unpack of the high-order data elements of the source and destination operands, saving the result in "xmm1". It ignores the lower half of the sources. The operation of this instruction is: dst[31-0] := dst[95-64]; dst[63-32] := src[95-64]; dst[95-64] := dst[127-96]; dst[127-96] := src[127-96].