Re: [Flashforth-devel] For-next loops - the New Design

[Peter J. <pe...@me...>]

Igor,
    I'm going to disagree with you on preference.  I think that most 
people will come to FF, not from assembler, but from some other 
high-level language and they will expect "0 for" to iterate 0 times.  I 
know that I do.  If I wanted to iterate 65536 times in one of my 
programs, I'd likely be wanting to do more iterations at some point and 
I'd use a 24-bit or 32-bit counter anyway.
Regards,
Peter J.


On 28/05/15 21:03, om1zz wrote:
> Do you insist on a single asm instruction for the entire for-next loop implementation?
> Do-loop is min 30 instructions in FF.
>
> I think that with N vs. N+1 idea when handling for (in any form) you break the consistency of for-loop implementation understanding.
>
> I would easily spend another 1-2 asm instructions and do it consistent. Speed plays no role here.
> When somebody wants to bitbang a pin it could be done in asm.
>
> N for ..
> N ?for ..
>
> both will do N loops through the body. The only diff is the ?for skips zero. That is very consistent.
>
> 0 for
>
> will do M loops where M=2^16 in this case. That is also consistent as you work with 16bit assembler.
>
> I am suggesting that as a standard for the for-loop design for any architecture on my github.
>
> Igor.
>
>
>
>
> ______________________________________________________________
>> Od: Mikael Nordman <mik...@fl...>
>> Komu: <fla...@li...>
>> Datum: 27.05.2015 17:59
>> Předmět: Re: [Flashforth-devel] For-next loops - the New Design
>>
>> Yes, Yes,
>> I understand what you want.
>> But you dont seem to understand that it cannot be done
>> in a simple for..next loop that has only one decrement and branch
>> instruction, and that has an index that counts down to zero.
>>
>> In order the get the full 16 bit loop count you have to give as input
>> the N+1 count.
>>
>> But if you have some idea how to implement it in PIC assembly code,
>> please write it out.
>>
>> BR Mike
>>
>> On 27.05.2015 10:32, om1zz wrote:
>>> 0 _for 65535 65534 ..
>>> .. 13 12 11 10 9 8 7 6 5 4 3 2 1 0
>>> 65536 ok<#,ram>
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