frexpf4

NAME

frexpf4 - return fractions and exponents of float elements

SYNOPSIS

Procedure call syntax:

#include <simdmath.h>

vector float frexpf4(vector float x, vector signed int *pexp);

Link with -lsimdmath

Inline call syntax:

#include <simdmath.h>

#include <frexpf4.h>

vector float _frexpf4(vector float x, vector signed int *pexp);

Parameters
x	input vector
*pexp	pointer to output vector

DESCRIPTION

The frexpf4 function is used to split the values of the elements in x into a normalized fraction and an exponent. frexpf4 returns a vector of fractions and a vector of exponent integers in *pexp.

Each fraction element frac, and each exponent integer element exp, represent the value of the corresponding element x, such that:

Every element of |frac| is in the interval or is 0.
$x=frac*2^exp$
If an element of x is 0 the corresponding element of *pexp is also 0.
If an element of x is NaN the corresponding element of the result is NaN and the corresponding element of *pexp is undefined.
If an element of x is Inf the corresponding element of the result is Inf and the corresponding element of *pexp is undefined.

RETURN VALUE

The function frexpf4 returns:

a float vector in which each element is defined as the normalized fraction of the corresponding element of x, and
a signed int* vector in which each element is defined as the exponent such that 2 raised to this value and multiplied by the normalized fraction is equal to x.

ENVIRONMENT

SPU and PPU

CONFORMING TO

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

NOTES

Basis

ISO9899 (C99) frexp functions.