Path: chuka.playstation.co.uk!news
From: "Peter Armstrong" <hanno@btinternet.com>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: negative scrolling on homebrew map routine - need help!!
Date: Wed, 21 Mar 2001 19:53:09 -0000
Organization: PlayStation Net Yaroze (SCEE)
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"Andrew Partington" <andrew.partington@harbinger.com> wrote in message
news:3AB8DFBA.7BDE2A4E@harbinger.com...
> Hang on - I think I know why i'm having problems setting the stack to
point at the
> DCache:
>
> I was browsing the member homepages and I came across Andreas
Schrattenecker's page
> - he did something similar, but he was using a couple of global variables
to store
> the stack pointer in, instead of trying to dump it straight on the stack
like the
> thick git that I am :-P
>
> Andreas reckons he's getting a 400% speed increase under CW, negligable
speed
> increase under GCC - is GCC really that much better when it comes to
producing
> optimal code?

I've been trying to set the stack pointer to the d-cache but havent been
having much luck. All my tests have been within the debugger, which seems to
have a problem with the new stack pointer. After your post I tried the
program in PSComsUtil and it runs fine.
Despite the new stack value in the target settings the ny.pxe file still has
it's stack set at the default 801FFFF0. I changed this to point to the
d-cache and the program runs but in siocons it won't return to the brick
screen.

CW code does seem to be a little slower than GCC code, I've not really done
any proper comparisons but in one instance the GCC compiled code was around
10% faster than CW.

> > Thanks Peter, that worked 100%!  But now I can't see how many
HSyncs/frame I am
> > getting - is there any way I can get my VSync(0) value back using
callbacks
> > without causing another wait for vertical retrace?  (calling VSync with
values
> > greater than 0 doesn't seem to return anything useful)

VSync(1) does still appear to return the hsync count, it's just its counter
is no longer reset. If you add the relevant lines from the following code
you should get the same timing value as before.

DrawSync(0);

timer = VSync(1) - timer;
FntPrint("timer  %d\n",timer);

wait = 1;
while(wait == 1);
wait = 2;

timer = VSync(1);

Regards,
Peter