Re: Processor specific optimisations

"MickaŽl Pointier" <mpointie@eden-studios.fr>
30 Jan 2002 00:59:34 -0500

          From comp.compilers

Related articles
[5 earlier articles]
Re: Processor specific optimisations walter@bytecraft.com (Walter Banks) (2002-01-24)
Re: Processor specific optimisations jgd@cix.co.uk (2002-01-24)
Re: Processor specific optimisations thp@cs.ucr.edu (2002-01-24)
Re: Processor specific optimisations RLWatkins@CompuServe.Com (R. L. Watkins) (2002-01-24)
Re: Processor specific optimisations mpointie@eden-studios.fr (MickaŽl Pointier) (2002-01-28)
Re: Processor specific optimisations rickh@capaccess.org (2002-01-28)
Re: Processor specific optimisations mpointie@eden-studios.fr (MickaŽl Pointier) (2002-01-30)
Re: Processor specific optimisations Ulrich.Teichert@gmx.de (2002-01-30)
Re: Processor specific optimisations perle@cs.tu-berlin.de (2002-01-30)
Re: Processor specific optimisations mpointie@eden-studios.fr (MickaŽl Pointier) (2002-02-06)
Re: Processor specific optimisations clc5q@cs.virginia.edu (Clark L. Coleman) (2002-02-06)
Re: Processor specific optimisations rickh@capaccess.org (2002-02-06)
| List of all articles for this month |

From: "MickaŽl Pointier" <mpointie@eden-studios.fr>
Newsgroups: comp.compilers
Date: 30 Jan 2002 00:59:34 -0500
Organization: ImagiNET / Colt Internet
References: 02-01-077 02-01-126 02-01-151
Keywords: optimize, architecture
Posted-Date: 30 Jan 2002 00:59:34 EST

> Ah, nice. Speaking of the 6502 and deliberately falling off the
> edge of the earth as a programming technique, has anyone ever used
> 6502 "pre-indexed indirect" addressing? I didn't find any occurance
> of it in the C64 ROMs, 8k by Commodore and 8k by Microsoft.


I never manage to find a case where it was worthwhile to use it.
This specific adressing mode takes too much cpu time, and too
much room in zero page for my tastes :)


Anyway, if someone has any practical use, and more specificaly, if a
compiler could use it efficiently, go ahead !


        Mickael Pointier
[There are lots of CISC instruction sets with instructions that compilers
never use because it's faster to use several simpler ones. The x86
ENTER instruction is a good example. -John]



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