isunordered(3) Test if arguments are unordered.

int isunordered(float x, float y);
intn isunordered(floatn x, floatn y);
int isunordered(double x, double y);
longn isunordered(doublen x, doublen y);

int isunordered (half x, half y) // if half extension enabled
shortn isunordered (halfn x, halfn y) // if half extension enabled


Test if arguments are unordered. isunordered() takes arguments x and y, returning non-zero if x or y is NaN, and zero otherwise.


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 Specificationm[][1]


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OpenCL Specification
page 264, section 6.12.6 - Relational Functions