This is a code dump associated with the benchmarking results that I posted to the x264 mailing list in September 2014.
At the time, I documented the changes to x264 that I made in the posts, but I recently received a request for the original code. Rather than send code to the sole requester, I'm making it universally available. I DO NOT purport this to be ready-to-use code.
This code was compiled at the time with v3.2 of Rowley Crossworks for ARM using the optional clang compiler.
As written, it leverages some of the I/O APIs provided as part of their IDE solution. I also leveraged the 'Target -> Download File' menu in the IDE to make it easy to pre-program the source material video frames into an unused region of the microcontroller's flash.