----- Original Message -----
From: Daniel Serpell <daniel@ATMLAB.UTFSM.CL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 26, 2003 5:59 PM
Subject: Re: [PIC]: 8-byte vertical adder?


> On Thu, Jun 26, 2003 at 05:13:46PM +0100, Sergio Masci wrote:
> > From: Daniel Serpell <daniel@ATMLAB.UTFSM.CL>
> >
> > Assuming that this is actually giving you what you want and that acc is 16
bits,
> > the first 3 iterations of the loop can be perfomed on 8 bit acc and the
> > remainder on 16 bit acc. Also your lookup table will require 256 entries
>
> I'm not thinking on using lookup tables. The code will be:
>

<snip>

>
> That's exactly 121 cycles, and 121 program words.
> But seeing it writen, I have found an error (try to spot it!),
> so 7 more instructions are needed (with 128 cycles total).
> The code can be expanded for more than 8 bits.
>
>     Daniel.

Unfortunatly I don't have time to go working through your code right now (which
is why I wrote the alogrithm in C in the first place). Perhaps you can show us
the corrected version?

Why do you not want to use a lookup table? This would speed things up. I will
certainly be having a closer look at what Scott has produced when I get a few
minutes.

Regards
Sergio Masci

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