A.5.222 PFRCPIT2: Packed Single-Precision FP Reciprocal/ Reciprocal Square
Root, Second Iteration Step
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.