This section describes half precision intrinsic functions that are only supported in device code. To use these functions, include the header file cuda_fp16.h in your program. The following macros are available to help users selectively enable/disable various definitions present in the header file:

• CUDA_NO_HALF - If defined, this macro will prevent the definition of additional type aliases in the global namespace, helping to avoid potential conflicts with symbols defined in the user program.

• __CUDA_NO_HALF_CONVERSIONS__ - If defined, this macro will prevent the use of the C++ type conversions (converting constructors and conversion operators) that are common for built-in floating-point types, but may be undesirable for half which is essentially a user-defined type.

• __CUDA_NO_HALF_OPERATORS__ and __CUDA_NO_HALF2_OPERATORS__ - If defined, these macros will prevent the inadvertent use of usual arithmetic and comparison operators. This enforces the storage-only type semantics and prevents C++ style computations on half and half2 types.