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(nasm.info)Section B.4.215

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B.4.215. `PFMAX': Packed Single-Precision FP Maximum
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     PFMAX mm1,mm2/m64             ; 0F 0F /r A4          [PENT,3DNOW]

   `PFMAX' returns the higher of each pair of single-precision FP
values.  If the higher value is zero, it is returned as positive zero.