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(nasm.info)Section B.4.211

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B.4.211. `PF2IW': Packed Single-Precision FP to Integer Word Convert
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     PF2IW mm1,mm2/m64             ; 0F 0F /r 1C          [PENT,3DNOW]

   `PF2IW' converts two single-precision FP values in the source operand
to signed 16-bit integers, using truncation, and stores them in the
destination operand. Source values that are outside the range supported
by the destination are saturated to the largest absolute value of the
same sign.

   * In the K6-2 and K6-III, the 16-bit value is zero-extended to
     32-bits before storing.

   * In the K6-2+, K6-III+ and Athlon processors, the value is
     sign-extended to 32-bits before storing.