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Devine Lu Linvega's posts Post Back to profile
Devine Lu Linvega

@d6 I can't come on IRC at the moment, but I have a question, and I think you might be able to help.

It's probably very silly, but I need a second opinion, for a part of a routine that checks if two characters are whitespace ( char1 char2 -- f ):

Instead of:
#21 LTH SWP #21 LTH AND

Would it be safe to just do:
ORA #21 LTH

23 May 2023 at 17:05 | Open on merveilles.town
6 comments
David JONES

@neauoire @d6 on a tangential note, I recommend.you implement WITHIN from Forth 2012. It encodes "is in" and "not in" range checks. I found it invaluable for tokenizing in my Forth.

23 May 2023 at 19:02 | Open on typo.social
⛧ esoterik ⛧

@neauoire best i can come up with for this is:

LTHk JMP SWP NIP #21 LTH

23 May 2023 at 19:34 | Open on merveilles.town
Kartik Agaram

@neauoire @d6 Neat idea, but here's a counter-example. If the stack countains a space (#20) and a tab (#09), their ORA would be #29, which would return false instead of true.

23 May 2023 at 19:56 | Open on merveilles.town
Devine Lu Linvega

@akkartik @d6 I ended up masking with a MUL 😬
23 May 2023 at 20:23 | Open on merveilles.town
Kartik Agaram

@neauoire Too clever by far for my taste 😄

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." -- Brian Kernighan

@d6

23 May 2023 at 20:41 | Open on merveilles.town
⛧ esoterik ⛧

@neauoire @akkartik i think comparing the max against #20 would be more straightforward but this works too i guess

23 May 2023 at 20:50 | Open on merveilles.town
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