Path: chuka.playstation.co.uk!news
From: sosman@terratron.com (Steven Osman)
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Daft Question [long]
Date: Fri, 31 Aug 2001 03:56:38 GMT
Organization: PlayStation Net Yaroze (SCEE)
Lines: 44
Message-ID: <3b910a19.35654388@www.netyaroze-europe.com>
References: <9m1d9c$b2i7@www.netyaroze-europe.com> <01c12ceb$fba64880$9709e4d5@pal-s-omnibook> <9m9c88$ioj5@www.netyaroze-europe.com> <01c12edc$cc2bf440$991fe4d5@pal-s-omnibook> <9me1g1$1sb13@www.netyaroze-europe.com> <9meajl$1sb17@www.netyaroze-europe.com> <9med8s$1sb18@www.netyaroze-europe.com> <9mekaq$1sb20@www.netyaroze-europe.com> <3b915bb2.83462112@www.netyaroze-europe.com> <9mm6uc$h6i10@www.netyaroze-europe.com> <9mmc13$ijv4@www.netyaroze-europe.com>
NNTP-Posting-Host: dsl092-099-074.nyc2.dsl.speakeasy.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Newsreader: Forte Agent 1.5/32.452

I thought you were wrong ;)  -- actually, I thought it was pretty neat
when you said the compile will convert it...

Unfortunately, Codewarrior doesn't do it:

given:

int a,b,c;
a=5000;
b=a/1024;
c=a>>10;

Here are the two "divisions":

Using divide:

lw       t2,4(sp)
nop      
bgez     t2,*+16
sra      t9,t2,10
addiu    t1,t2,1023
sra      t9,t1,10
sw       t9,8(sp)

Using shift:

lw       t0,4(sp)
nop      
sra      t2,t0,10
sw       t2,12(sp)


On Thu, 30 Aug 2001 22:43:42 +0100, "Jon Prestidge  (Jon@surfed.to)"
<jon@surfed.to> wrote:

>> and divide by 1024 instead (the compiler
>> will convert it to >>10
>> for you... unless it's a very crap compiler).
> 
>um, am I right?  I'm having second thoughts whether the compile would do that for you now... best put ">>10" instead of "/1024" to make sure incase I'm wrong.
>
>yours,
>"flakey Jon".