expm1f4

NAME

expm1f4 - return one less than e exponentiated by float elements

SYNOPSIS

Procedure call syntax:

#include <simdmath.h>

vector float expm1f4(vector float x);

Link with -lsimdmath

Inline call syntax:

#include <simdmath.h>

#include <expm1f4.h>

vector float _expm1f4(vector float x);

Parameters
x	input vector

DESCRIPTION

The expm1f4 function returns a vector of the exponential minus one (e^x)-1 for each element in x.

The purpose of this function is to return mathematically accurate values, even when an element is close to 0 (zero) so the exponent is close to 1 (one) leading to floating-point cancellation errors.

RETURN VALUE

The function expm1f4 returns a float vector in which each element is defined as:

one less than e raised to the power of the corresponding element of x.

ENVIRONMENT

SPU and PPU

CONFORMING TO

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

NOTES

Basis

ISO9899 (C99) exp function