PFRCPIT1
Usage: PFRCPIT1 dest,src Modifies flags: None
Performs the first intermediate step in the Newton-Raphson iteration to refine the reciprocal approximation produced by the PFRCP instruction (the second and final step completes the iteration and is accurate to 24 bits).
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. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcpit1 mm1 mm2
PFRCPIT1
Usage: PFRCPIT1 dest,src Modifies flags: None
Performs the first intermediate step in the Newton-Raphson iteration to refine the reciprocal approximation produced by the PFRCP instruction (the second and final step completes the iteration and is accurate to 24 bits).
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. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcpit1 mm1 mm2
PFRCPIT1
Usage: PFRCPIT1 dest,src Modifies flags: None
Performs the first intermediate step in the Newton-Raphson iteration to refine the reciprocal approximation produced by the PFRCP instruction (the second and final step completes the iteration and is accurate to 24 bits).
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. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcpit1 mm1 mm2