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(nasm.info)Section B.4.217

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B.4.217. `PFMUL': Packed Single-Precision FP Multiply
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     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].