A.5.221 PFRCPIT1: Packed Single-Precision FP Reciprocal, First Iteration
Step
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 (section A.5.222). For more
details, see the AMD 3DNow! technology manual.