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FREXP(3clc) OpenCL Manual FREXP(3clc)


frexp - Extract mantissa and exponent.

floatn frexp(floatn x, __global intn *exp);

floatn frexp(floatn x, __local intn *exp);

floatn frexp(floatn x, __private intn *exp);

float frexp(float x, __global int *exp);

float frexp(float x, __local int *exp);

float frexp(float x, __private int *exp);

doublen frexp(doublen x, __global intn *exp);

doublen frexp(doublen x, __local intn *exp);

doublen frexp(doublen x, __private intn *exp);

double frexp(double x, __global int *exp);

double frexp(double x, __local int *exp);

double frexp(double x, __private int *exp);

halfn frexp(halfn x, __global intn *exp);

halfn frexp(halfn x, __local intn *exp);

halfn frexp(halfn x, __private intn *exp);

half frexp(half x, __global int *exp);

half frexp(half x, __local int *exp);

half frexp(half x, __private int *exp);


Extract mantissa and exponent from x. For each component the mantissa returned is a float with magnitude in the interval [1/2, 1) or 0. Each component of x equals mantissa returned * 2exp.


The built-in math functions are not affected by the prevailing rounding mode in the calling environment, and always return the same value as they would if called with the round to nearest even rounding mode.

An application that wants to use half and halfn types will need to include the #pragma OPENCL EXTENSION cl_khr_fp16(3clc) : enable directive.


OpenCL Specification[1]




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OpenCL Specification
page 244, section 6.12.2 - Math Functions
01/14/2021 The Khronos Group