OpenCL global vs __global and kernel vs __kernel

Question

This is more a question of semantics.

In XCode, __global and global are syntax highlighted the same. __kernel and kernel are syntax highlighted the same.

What is the difference between __global vs global and __kernel vs kernel? Are they the same?

Answer 1

There is no difference.

By manual for __global:

The address space names without the __ prefix i.e. global, local, constant and private may be substituted for the corresponding address space names with the __ prefix.