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(nasm.info)Section B.4.221

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B.4.221. `PFRCPIT1': Packed Single-Precision FP Reciprocal, First Iteration Step
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     PFRCPIT1 mm1,mm2/m64          ; 0F 0F /r A6          [PENT,3DNOW]

   `PFRCPIT1' performs the first intermediate step in the calculation of
the reciprocal of a single-precision FP value. The first source value
(`mm1' is the original value, and the second source value (`mm2/m64' is
the result of a `PFRCP' instruction.

   For the final step in a reciprocal, returning the full 24-bit
accuracy of a single-precision FP value, see `PFRCPIT2' (*Note Section
B.4.222::). For more details, see the AMD 3DNow! technology manual.