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(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.
\m[blue]OpenCL Specification\m[]\s-2\u[1]\d\s+2
relationalFunctions(3clc)
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OpenCL Specification
page 264, section 6.12.6 - Relational Functions