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From: colonel@gloria.UUCP (Col. G. L. Sicherman)
Newsgroups: net.lang.c
Subject: Re: fast string copy
Message-ID: <1049@gloria.UUCP>
Date: Wed, 27-Mar-85 19:43:11 EST
Article-I.D.: gloria.1049
Posted: Wed Mar 27 19:43:11 1985
Date-Received: Sat, 30-Mar-85 00:20:24 EST
References: <1061@decwrl.UUCP>
Organization: The Church of Artificial Intelligence
Lines: 24

["In the service of Virman Vundabar we learn perfection!"]

> I think this is cute, how VAX/VMS beats Unix at its own game.  The VMS C
> compiler generates code as good as or better than anything I have seen posted
> so far!
> 
> 	char *s,*t;
> 	while (*s++ = *t++);
> 
> generates (on a VAX 780):
> 
> 		movb	(r2)+,(r1)+
> 		beql	sym.2
> 	sym.1:
> 		movb	(r2)+,(r1)+
> 		bneq	sym.1
> 	sym.2:
> 
> This is as fast as you can get.

Careful!  You can probably speed it up by unrolling the loop....
-- 
Col. G. L. Sicherman
...{rocksvax|decvax}!sunybcs!colonel