Re: A86: Line routine

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Line routine
From: Jimmy =?iso-8859-1?Q?M=E5rdell?= <yarin@acc.umu.se>
Date: Wed, 06 May 1998 14:32:05 +0200
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <Pine.LNX.3.95.980505214937.9275C-100000@S-103-151.resnet.o hio-state.edu>
References: <3.0.5.32.19980506033230.008132f0@mail.acc.umu.se>
Reply-To: assembly-86@lists.ticalc.org


At 21:53 1998-05-05 -0400, you wrote:
>
>On Wed, 6 May 1998, Jimmy Mårdell wrote:
>
>> How fast? I've made a pretty fast line routine using self-modifying
>> code, no temporary mem and only one push/pop in the repeat routine.
>> It's about 4 times faster than Stephane Jantzens line routine.
>
>The inner loop of my line routine takes about 110 t-states per pixel (more
>or less, depending on the slope of the line).  It also uses no temporary
>memory and only one push/pop.  Do you want to exchange routines?  They
>probably look the same. :-) 

I counted the T cycles in the FLINE inner loop:

 * delta_x >= delta_y   ==>   98.5   T cycles average
 * delta_x <  delta_y   ==>  106.75  T cycles average

I think FLINE is available at ticalc.org (at least as an Usgard function
library).

--
Real name: Jimmy Mårdell                "can't go mucking with a 'void *'"
IRC......: Yarin                                // Apple's MPW C compiler
Email....: mailto:yarin@acc.umu.se        
Homepage.: http://www.algonet.se/~mja/

References:

Re: A86: GetPixel

From: Jimmy =?iso-8859-1?Q?M=E5rdell?= <yarin@acc.umu.se>

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