Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!bagate!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.advocacy
Subject: Re: (Video) Hardware Idiots ?
Message-ID: <22362@cbmvax.commodore.com>
Date: 12 Jun 91 18:41:28 GMT
References: <1991Jun8.191231 <1991Jun9.0 <1991Jun9.060440.29078@leland.Stanford.EDU> <1991Jun10.065629.21255@marlin.jcu.edu.au>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 20

In article <1991Jun10.065629.21255@marlin.jcu.edu.au> cpca@marlin.jcu.edu.au (Colin Adams) writes:
>In article <1991Jun9.060440.29078@leland.Stanford.EDU> bard@jessica.stanford.edu (David Hopper) writes:
>>DON'T, don't EVER think that the blitter drags the system down.

>On the speed of the 030 vs the blitter.  A student here was using
>the blitter to copy screens around constantly for his graphics project
>on his Amiga 3000 and it was going a bit slow.
>I told him to try using CopyMemQuick and he got a 75% increase in speed.
>Nough said!

Not really.  You have done a simple test of the best case for the 68030 vs.
the blitter.  Now try the worst case.  Instead of longword aligned blocks of
memory, try a situation where source and destination are on different bit
boundaries.  Next, try a three operand blit operation, where all three operands
are on different bit boundaries.  You'll see that the blitter does the 
nontrivial cases pretty well.
-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
	"This is my mistake.  Let me make it good." -R.E.M.