signbit3clc

int signbit(float );

intn signbit(floatn );

int signbit(double );

longn signbit(doublen );

Overview

The built-in function signbit tests for sign bit. The scalar version of the function returns a 1 if the sign bit in the float is set else returns 0. The vector version of the function returns the following for each component in floatn: -1 (i.e. all bits set) if the sign bit in the float is set else returns 0.

Notes

If an implementation extends this specification to support IEEE-754 flags or exceptions, then all built-in relational functions shall proceed without raising the invalid floating-point exception when one or more of the operands are NaNs.

The built-in relational functions are extended with cl_khr_fp16(3clc) to include appropriate versions of functions that take half, and half{2|3|4|8|16} as arguments and return values.

The function returns a 0 if the specified relation is false and a 1 if the specified relation is true for scalar argument types. These functions shall return a 0 if the specified relation is false and a - 1 (i.e. all bits set) if the specified relation is true for vector argument types.

Specification

OpenCL Specification[1]

Notes

1.

OpenCL Specification

page 264, section 6.12.6 - Relational Functions