Much as I take his overall point - that a close to the metal language is not always best for performance - the author would be well advised to take a look at the C99 restrict keyword.
gcc certainly does (use -std=c99). If you don't want to use C99, use __restrict__ to use it as a gcc extension. This is C-specific - I don't believe a similar standard has worked its way into C++ yet, although compilers may have extensions that support it. I don't know about msvc, I'm afraid.
