logbd2

NAME

logbd2 - return exponents of double elements

SYNOPSIS

Procedure call syntax:

#include <simdmath.h>

vector double logbd2(vector double x);

Link with -lsimdmath

Inline call syntax:

#include <simdmath.h>

#include <logbd2.h>

vector double _logbd2(vector double x);

Parameters
x	input vector

DESCRIPTION

The logbd2 function determines an integer exponent exp and a fraction frac that represent the value of a finite element of x.

RETURN VALUE

The function logbd2 returns a double vector in which each element is defined as the exponent of the corresponding element of x expressed as a floating-point value, such that:

$x=frac*exp^FLT_RADIX$
|frac| is in the interval [1, FLT_RADIX)
If an element of x is negative, the corresponding element of the result is undefined.

For the logbd2 function on the SPU:

if an element of x is 0 the result is undefined.

ENVIRONMENT

SPU only

CONFORMING TO

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

NOTES

Basis

ISO9899 (C99) logb functions.