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

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

Some reasoning to mu suggestion below:
1. we talking here forth - a better macro assembler
2. with your scenario we move towards a primitive function with "more intelligence" than one would expected from a better assembler..
3. imho for-next in forth is an equivalent of "decrement and skip if zero" construct, where (at least me since '82) observed the behaviour when putting zero in it loops for a lot of times around :)
Igor

>Hmm, the old FOR shall behave, I think:
>
>2 for ---> 1 0 (2 counts)
>0 for ----> 65535 65534 .. 0 (65536 counts)
>
>new ?FOR
>
>2 ?for ---> 1 0 (2 counts)
>0 ?for ---> skip (none count)
>
>So no change with 99,99999% of old code.
>I.
>
>______________________________________________________________
>> Od: Mikael Nordman <mik...@fl...>
>> Komu: <fla...@li...>
>> Datum: 26.05.2015 06:38
>> Předmět: Re: [Flashforth-devel] For-next loop - full 16bit count?
>>
>>I did some experiments with this and have now two for..next loops
>>: t for r@ u. next ;  ok<#,ram>
>>: tt for2 r@ u. next ;  ok<#,ram>
>>9 t 8 7 6 5 4 3 2 1 0  ok<#,ram>
>>9 tt 9 8 7 6 5 4 3 2 1 0  ok<#,ram>
>>
>>The only problem is the naming of the words.
>>The old FOR ideally should be called ?FOR
>>and the new one FOR.
>>But that introduces a problem with existing FF code...
>>
>>Mike
>>
>>On 24.05.2015 16:00, om1zz wrote:
>>> 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).
>>
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>