Rsqrt - Analog Devices VISUALDSP++ 3.5 Manual

rsqrt

reciprocal square root
Synopsis
#include <math.h>
float rsqrtf (float a);
double rsqrt (double a);
Description
This function calculates the reciprocal of the square root of the number
If is negative, the function returns 0.
a
Algorithm
Domain
[0.0 to +3.4 x 10
VisualDSP++ 3.5 C/C++ Compiler and Library Manual
for ADSP-219x DSPs
38
for
rsqrtf()
DSP Run-Time Library
.
a
4-101