OpenCL Programming by Example

Built-in functions

In OpenCL C you cannot include the standard header files provided by C99 standard such as, math.h, stdio.h, stdlib.h, errno.h, and so on. OpenCL C provides a huge set of built in functions, which can be used by the programmer for programming the OpenCL kernels. Using built-in functions wherever possible may result in performance enhancement. Also this will make sure the code is portable across different vendors. We will discuss briefly the group of built-ins and will leave it to the reader to take a look at section 6.12 of OpenCL specification 1.2.

Work item function

While enqueuing a kernel using clEnqueueNDRangeKernel, we specify the global and local work sizes. To determine these values during the kernel function execution ...