NASM 2.05 based x86 Instruction Reference[ch241]

A.5.217 PFMUL: Packed Single-Precision FP Multiply PFMUL mm1,mm2/m64 ; 0F 0F /r B4 [PENT,3DNOW] PFMUL returns the product of each pair of single-precision FP values. dst[0-31] := dst[0-31] * src[0-31], dst[32-63] := dst[32-63] * src[32-63].