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Offline Freyaday

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Re: Features Wishlist
« Reply #3255 on: October 07, 2013, 10:22:56 am »
I just realized that bitshifting a var down one is equivalent to var>1. Is there a way this optimization could find its way into Axe?
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Offline Runer112

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Re: Features Wishlist
« Reply #3256 on: October 07, 2013, 01:26:31 pm »
Can you clarify what you mean, perhaps showing it in code and how it should be optimized?

Offline Streetwalrus

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Re: Features Wishlist
« Reply #3257 on: October 07, 2013, 03:52:38 pm »
Well, that's basically var/2. And it only works on unsigned values so it can't be an auto opt.

Offline Freyaday

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Re: Features Wishlist
« Reply #3258 on: October 07, 2013, 10:09:35 pm »
Instead of doing
Code: [Select]
I>1 or
Code: [Select]
I>=2, you can do
Code: [Select]
I/2 which is already auto-opted to a bitshift; could the other two functions be added to the auto-opts? It also works for other powers of two.
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Offline Runer112

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Re: Features Wishlist
« Reply #3259 on: October 07, 2013, 10:15:23 pm »
But those return completely different things..?

I realize that in the context of a conditional like If I>1, dividing by 2 will result in the same conditional branch being followed, but people can use it in computations as well. If you want the optimization in the context of conditionals and understand the different return value, you can always do it manually. :P Axe doesn't really have great capability to perform context-sensitive optimizations that only trigger in certain scenarios. I don't think the peephole optimizer's current state (the system that seems like would be responsible for such an optimization) could even support making this optimization only in if statements.
« Last Edit: October 07, 2013, 10:19:19 pm by Runer112 »

Offline Builderboy

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Re: Features Wishlist
« Reply #3260 on: October 08, 2013, 05:18:42 am »
A good example of why this would break down is that you could no longer do things like If (I>1) and (A=2), since the 'and' operator is bitwise instead of boolean the conditional would never pass if I is 4 for instance.

Offline Streetwalrus

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Re: Features Wishlist
« Reply #3261 on: October 08, 2013, 11:45:18 am »
Well, ? and ?? should be used for conditionals anyway.
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Offline Hayleia

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Re: Features Wishlist
« Reply #3262 on: October 08, 2013, 01:22:28 pm »
Well, ? and ?? should be used for conditionals anyway.
That doesn't mean you can't put optimizations within this kind of "blocks". For example, if you want to store 1 in D when B>1 and don't touch it otherwise, you can do B>1?→D.
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Offline Streetwalrus

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Re: Features Wishlist
« Reply #3263 on: October 08, 2013, 01:29:20 pm »
I was just telling BB that ?? and ? were better than or and and. ;) I know about this kind of HL abuse, it's pretty awesome. :D
And I personally believe that it just shouldn't auto opt >1 to /2 because of what Hayleia said.
« Last Edit: October 08, 2013, 01:31:11 pm by Streetwalker »

Offline TIfanx1999

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Re: Features Wishlist
« Reply #3264 on: October 08, 2013, 02:06:10 pm »
A good example of why this would break down is that you could no longer do things like If (I>1) and (A=2), since the 'and' operator is bitwise instead of boolean the conditional would never pass if I is 4 for instance.

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Offline Freyaday

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Re: Features Wishlist
« Reply #3265 on: October 19, 2013, 01:20:56 pm »
Is signed for loop comparisons a possibility?
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Offline Runer112

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Re: Features Wishlist
« Reply #3266 on: October 19, 2013, 01:22:49 pm »
Possible: yes. Easy to implement: I'm not so sure... I'll look into it, though.

Offline ClrDraw

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Re: Features Wishlist
« Reply #3267 on: October 19, 2013, 01:30:35 pm »
It would be awesome if Axe also had more commands for utility type programs in addition to all the game stuff.
It would be great if it could:

RunPRGM(programNAME)
easily run achived/unarchived basic and assembly programs without an axiom

RunAPP(appNAME)
run Apps from within the program
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Offline Runer112

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Re: Features Wishlist
« Reply #3268 on: October 19, 2013, 01:37:17 pm »
Running external apps and programs is tricky and should really involve stuff like error handlers when done properly. Considering DrDnar's axiom exists and does most of that already, and that the Axe application's 2 pages are pretty much completely full, I don't think this is something I'd consider adding to Axe at the moment.

Offline jo-thijs

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Re: Features Wishlist
« Reply #3269 on: October 30, 2013, 05:48:42 pm »
I've just noticed the use of rp_Ans and rp_Byte in the Commands.inc file, it's brillant!
when I saw, it, a question arose however: what if it would be possible to find another start code
that is followed by a label, where axe will go to the label and copy the code that is there in the final code
and then return? could this free some space in axe, without slowing axe too much down?
an example would be:
p_ShiftLeftFast:         ;16982 cycles, 44 bytes
   .db __ShiftLeftFast_SubEnd-1-$
   ld   hl,plotSScreen+768
x_ShiftLeftFastEntry:
   ld   b,64
__ShiftLeftFast_Loop:
   dec   hl
   sla   (hl)
__ShiftLeftFast_SubEnd:
   .db copy_subfunc
   .dw _ShiftLeftFast_End
   .db 0,copy_subfunc
   .dw _ShiftLeftFast_End
   .db 6
   dec   hl
   rl   (hl)
   djnz   __ShiftLeftFast_Loop
   ret
__ShiftLeftFast_End:
   .db 15
   dec   hl
   rl   (hl)
   dec   hl
   rl   (hl)
   dec   hl
   rl   (hl)
   dec   hl
   rl   (hl)
   dec   hl
   rl   (hl)

which would be 6 bytes smaller if I'm correct.
another example:
p_NEN2:
   .db 1
   inc   l
   .db copy_subfunc
   .dw p_NEN1
        .db 0

which would save 3 bytes.
another example:
p_NE2:
   .db 1
   dec   l
   .db copy_subfunc
   .dw p_NE1
   .db 0

which would save 4 bytes.
and so on.

this is probably just a crazy idea I got, but I wanted to post it anyway.