log2d2

NAME

log2d2 - return base-2 logarithms of double elements

SYNOPSIS

Procedure call syntax:

#include <simdmath.h>
vector double log2d2(vector double x);
Link with -lsimdmath

Inline call syntax:

#include <simdmath.h>
#include <log2d2.h>
vector double _log2d2(vector double x);
Parameters  
x input vector

DESCRIPTION

The log2d2 function returns a vector of the base 2 logarithms of the corresponding elements of x.

RETURN VALUE

Thelog2d2 function returns a double vector in which each element is defined as:
  • the base 2 logarithm for the corresponding element of x.
  • If an element of x is negative, the corresponding element of the result is undefined.

ENVIRONMENT

SPU only

CONFORMING TO

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

NOTES

Basis

ISO9899 (C99) log2 functions.

SEE ALSO

log2(3), log2f4(3), exp2(3), exp2d2(3), exp2f4(3), cbrt(3), cbrtd2(3), cbrtf4(3), exp(3), expd2(3), expf4(3), frexp(3), frexpd2(3), frexpf4(3), hypot(3), hypotd2(3), ilogb(3), ilogbd2(3), ilogbf4(3), ldexp(3), ldexpd2(3), ldexpf4(3), log(3), logd2(3), logf4(3), log10(3), log10d2(3), log10f4(3), log1p(3), log1pd2(3), log1pf4(3), logb(3), logbf4(3), scalbn(3), scalbnf4(3), sqrt(3), sqrtd2(3), sqrtf4(3)