Appendix E. Cg Standard Library Functions
Cg provides a set of built-in functions and predefined structures with binding semantics to simplify GPU programming. These functions are similar in spirit to the C standard library, offering a convenient set of common functions. In many cases, the functions map to a single native GPU instruction, so they are executed very quickly. Of the functions that map to multiple native GPU instructions, you may expect the most useful to become more efficient in the near future.
Although you can write your own versions of specific functions for performance or precision reasons, it is generally wiser to use the Cg Standard Library functions when possible. The Standard Library functions will continue to be optimized ...
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