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(nasm.info)Section B.4.214

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B.4.214. `PFCMPxx': Packed Single-Precision FP Compare
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     PFCMPEQ mm1,mm2/m64           ; 0F 0F /r B0          [PENT,3DNOW]
     PFCMPGE mm1,mm2/m64           ; 0F 0F /r 90          [PENT,3DNOW]
     PFCMPGT mm1,mm2/m64           ; 0F 0F /r A0          [PENT,3DNOW]

   The `PFCMPxx' instructions compare the packed single-point FP values
in the source and destination operands, and set the destination
according to the result. If the condition is true, the destination is
set to all 1s, otherwise it's set to all 0s.

   * `PFCMPEQ' tests whether dst == src;

   * `PFCMPGE' tests whether dst >= src;

   * `PFCMPGT' tests whether dst > src.