NetBSD master CVS tree commits

[source%NetBSD.ORG@localhost]

cgd
Mon Mar 24 15:01:41 PST 1997
Update of /cvsroot/src/sys/arch/alpha/alpha
In directory netbsd1:/var/slash-tmp/cvs-serv21033

Modified Files:
        mem.c 
Log Message:
Optimize the case of writing to /dev/zero, and clean up the
surrounding code a bit.  Partly suggested by gwr, them implemented
by mycroft in the i386 port, then cleaned up a bit to fit here.