Test for a NaN.

int isnan ( float )
intn isnan ( floatn )
int isnan ( double )
longn isnan ( doublen )

int isnan (half) // if half extension enabled shortn isnan (halfn) // if half extension enabled


Test for NaN.


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 to include versions that take half, and half{2|3|4|8|16} as arguments.

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.


OpenCL Specification

Also see

Relational Functions

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