Just using the copy & zero code in <asm/string-486.h> would give a big
boost for the Pentium, I suspect. I believe Linus when he says that
file contains bugs, and I wouldn't be at all surprised if the copy isn't
optimal for a Pentium. But it'll be a big improvement over `rep movsl'.
We don't care about the other string functions anyway -- my vote is for
ditching them. Just optimise the zero and copy functions. Any takers?
(Oh yeah, and move those huge codes _out of line_ too -- those huge
unrolled loops don't need to be inline and take valuable memory).
-- Jamie
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