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(nasm.info)Section B.4.222

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B.4.222. `PFRCPIT2': Packed Single-Precision FP Reciprocal/ Reciprocal Square Root, Second Iteration Step
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     PFRCPIT2 mm1,mm2/m64          ; 0F 0F /r B6          [PENT,3DNOW]

   `PFRCPIT2' performs the second and final intermediate step in the
calculation of a reciprocal or reciprocal square root, refining the
values returned by the `PFRCP' and `PFRSQRT' instructions, respectively.

   The first source value (`mm1') is the output of either a `PFRCPIT1'
or a `PFRSQIT1' instruction, and the second source is the output of
either the `PFRCP' or the `PFRSQRT' instruction.  For more details, see
the AMD 3DNow! technology manual.