Seems we aren't the only ones concerned about memset-like optimizations:

	http://www.bsdforums.org/forums/showthread.php?threadid=3778

This talks about using MMX assembly instructions for memcpy.

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  Bruce Momjian                        |  http://candle.pha.pa.us
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Fri, 18 Oct 2002 13:01:29 -0400 (EDT)
Bruce Momjian <pgman@candle.pha.pa.us>
memcpy testing