Re: [Flashforth-devel] For-next loop - full 16bit count?

[om1zz <om...@vo...>]

Yea, I do understand the zero loop skip intention, but I consider that a bug.
There is no way to do full 65536 loops with 16bit without doing 0 for..next.

As the web knowledge says - there are only incompatible for-next loops and inefficient and lazy do-loops :)

I would recommnd to change the behavior to full 16bit, entering 0 should be the users responsibility (similar as divide by zero).

Or to have for..next 16bit and mfor..next with less bits (like an 8bitter mcu processing 255 data values only) :)
I.


______________________________________________________________
> Od: Mikael Nordman <mik...@fl...>
> Komu: <fla...@li...>
> Datum: 24.05.2015 12:39
> Předmět: Re: [Flashforth-devel] For-next loop - full 16bit count?
>
>Yep,
>You are right. next works bu decrementing the index and checking for
>carry when the index goes from 0 to 65535.
>
>The 0 for..next loops zero times.
>The 2 for..next loops two times. index values are 1 and 0
>65535 for..next loops 65535 times. Index goes from 65534 to 0
>
>for..next was designed to check for the  zero count and not loop in case 
>the count is zero. This is very useful in all cases except if
>you want to loop the full 65536 times.
>
>BR Mike
>
>On 24.05.2015 13:06, om1zz wrote:
>> Hmm, while messing with an external memory I need to count over entire unsigned 16bit for-loop range (to work with a block of 65536 data).
>>
>> When doing
>>
>> 65535 for ... next
>>
>> I get 65535 counts ( 65534..0), but I miss 65535th :)
>>
>> I've tried
>>
>> 0 for ... next
>>
>> but that does not loop. I think with zero input it should count over $ffff down to zero to get the full 16bit scope..
>
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