recipf4_fast

NAME

recipf4_fast - return approximate reciprocals of float elements

SYNOPSIS

Procedure call syntax:

#include <simdmath.h>

vector float recipf4_fast(vector float x);

Link with -lsimdmath

Inline call syntax:

#include <simdmath.h>

#include <recipf4.h>

vector float _recipf4_fast(vector float x);

Parameters
x	input vector

DESCRIPTION

The recipf4_fast function returns a vector of the reciprocals of the corresponding elements of x. The recipf4 function provides a slower but more accurate version of recipf4_fast.

RETURN VALUE

The function recipf4_fast returns a float vector in which each element is defined as:

the reciprocals of the corresponding element of x.
When an element of x is Inf the result is 0 with the sign of x.
When an element of x is 0:
- on the PPU the result is Inf with the sign of x,
- on the SPU the result is HUGE_VAL with the sign of x.
When an element of x is NaN the result is NaN.

ENVIRONMENT

recipf4_fast: SPU only

CONFORMING TO

SIMD Math library specification for the Cell Broadband Engine™ Architecture.

NOTES

Basis

ISO9899 (C99) recip functions.