NAME
sqrtf4_fast - return approximate square root of float elementsSYNOPSIS
Procedure call syntax:
| #include <simdmath.h> |
| vector float sqrtf4_fast(vector float x); |
| Link with -lsimdmath |
Inline call syntax:
| #include <simdmath.h> |
| #include <sqrtf4.h> |
| vector float _sqrtf4_fast(vector float x); |
| Parameters | |
| x | input vector |
DESCRIPTION
The sqrtf4_fast function computes the square roots of the elements of the input vectors.
The values returned are up to 3 ULP (units of least position)
off over the input range [1.0,3.99999...]. This is the default implementation
and has a histogram of error of:
| ULP Error | Count |
|---|---|
| -3 | 0 |
| -2 | 68 |
| 0 | 5985155 |
| 1 | 8611186 |
| 2 | 1752588 |
| 3 | 43324 |
RETURN VALUE
The function sqrtf4_fast returns
a float vector in which each element is defined as 
ENVIRONMENT
SPU only
CONFORMING TO
SIMD Math library specification for the Cell Broadband Engine™ Architecture.
NOTES
Basis
ISO9899 (C99) sqrt functions.