Frank Buss wrote:
> Looks like these 2 words are missing in ficl. Maybe there are other
useful
> words to convert integers to floats and vice-versa?
>
.... [code snipped]
>
>
> But this doesn't work. Looks like ficl saves a double in low/high
format.
> This is the output of Win32Forth:
>
> 12. . .
> 0 12
>
> and this on ficl (compiled on an ARM platform) :
> 12. . .
> 12 0
>
> Which one is the right one? I don't understand what the word "above"
means
> in "3.1.4.1 Double-cell integers".
"Above" is in the context of the stack, and means closer to TOS. On
most systems that's a lower memory address, but the intent is to avoid
being specific about memory addresses to avoid constraining
implementations.
> For me it looks better to push the high value as the last item on stack,
> because then I can just drop it, if not needed, instead of "swap drop"
Yes, that's exactly why the order is as it is (that was also
overwhelming common practice when the rule was written)
, so
> I've changed the ficl parsing function, now my d>f and f>d words are
> working as expected, e.g. like this:
>
> 12. d>f -6. d>f f/ f>d drop .
> -2
>
> But the other double words are not working any more.
Probably ficl has a lot of dependencies on the order they chose.
> Is there a better
> Forth system for ARM9 plaforms, maybe compiled instead of interpreted?
> Currently it runs in a WindowsCE environment and I need to interface to
> lots of C functions for driver accessing. Later it is possible that it
> should work with "Net+OS" ( http://www.digi.com/pdf/fs_netos7.pdf
),
too,
> which has lots of C functions, too.
Ficl is probably the most C-friendly. There's a SwiftX for ARMs, but
it's really designed for standalone targets.
Cheers,
Elizabeth
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