Thanks for the feedback; it helps me better understand concerns I
should be aware of in these cases.  Needless to say, I now think that
a more conservative and less [potentially] costly approach is
warranted.

In the FreeBSD source tree (src/lib/libc/amd64/string, IIRC), they
made some changes to our string functions (mostly removing vestigial
i386 instructions).  Would these changes be a good thing to merge in?

Regards,

--Blair