OpenCL™ Developer Guide for Intel® Core™ and Intel® Xeon® Processors
Why Optimizing Kernels Is Important?
As the OpenCL™ runtime calls an issued kernel many times, optimizing
the kernel can bring performance gains. If you move a piece of code out
of the innermost loop in a typical native code, move it from the kernel
as well. Examples of code types that you might move out of the loop: