I made an implementation, which was quite a lot faster than my co-vorker's and this started a friendly competition to make the fastest portable C implementation of memcpy(). When looking at his code, I found several places where improvements could be made. His implementation was faster than many standardized C library routines found in the embedded market. The story began when a co-worker of mine made an implementation of memcpy that he was very proud of. This implementation has been used successfully in several project where performance needed a boost, including the iPod Linux port, the xHarbour Compiler, the pymat python-Matlab interface, the Inspire IRCd client, and various PSP games. This article describes a fast and portable memcpy implementation that can replace the standard library version of memcpy when higher performance is needed.
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