Article View: comp.sys.amiga.tech
Article #12956Re: ExecBase
From: Tomas G. Rokicki
Date: Thu, 01 Jun 1989 17:40
Date: Thu, 01 Jun 1989 17:40
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In article <44325@vax1.tcd.ie>, rwallace@vax1.tcd.ie writes: > In article <8905242209.AA20811@postgres.Berkeley.EDU>, dillon@POSTGRES.BERKELEY.EDU (Matt Dillon) writes: > > I strongly suggest though that people who write programs or > > assembly routines NOT always get execbase from location 4. The reason is > > simply that from what I can tell location 4 is in CHIP memory and thus > > subject to fetch delays when one is in a high bandwidth video mode. > You WHAT? How long is one instruction going to take no matter how high > bandwidth a video mode you're using? If you're accessing ExecBase at all it > means you're calling a ROM routine and those are so bloody inefficient the If you are using one of those video modes that take up `all' bandwidth (such as many under the new ECS, or hires four-bit plane) that *one* instruction can easily take an entire scan-line, or 63us. Most library routines (such as exec) are not as inefficient as this. Listen to Matt; he knows whereof he speaks of. Wherefor dost thou question him?
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!decwrl!shelby!polya!rokicki From: rokicki@polya.Stanford.EDU (Tomas G. Rokicki) Newsgroups: comp.sys.amiga.tech Subject: Re: ExecBase Message-ID: <9641@polya.Stanford.EDU> Date: 1 Jun 89 17:40:18 GMT References: <8905242209.AA20811@postgres.Berkeley.EDU> <44325@vax1.tcd.ie> Sender: Tomas G. Rokicki <rokicki@polya.Stanford.EDU> Organization: Stanford University Lines: 18