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ready.
Registered: Feb 2003
Posts: 441 |
64tass: labels inside FOR ... NEXT loops
hello,
does 64tass have the possibility to use indexed labels, like inside a FOR...NEXT loop?
Something like:
.FOR X=0, X<X_MAX-1, X=X+1
LABEL(X)
LDA #ABC
STA ZXY
.NEXT
so to have X_MAX labels.
Unrolled:
LABEL1
LDA #ABC
STA ZXY
LABEL2
LDA #ABC
STA ZXY
..... |
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Compyx
Registered: Jan 2005
Posts: 631 |
Sorry, I meant ^start of course.
Personally I'd rather break stuff now than later if it makes sense. Keeping old cruft around doesn't make maintaining things easier.
Deprecation warnings only serve to have people think "I'll fix that later", which they only do when stuff actually breaks. |
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soci
Registered: Sep 2003
Posts: 474 |
It's not a maintenance issue as the code implementing it was refactored a few times already and is not much.
The concern is that the de facto standard notation for bank bytes still can't be used while there was a 100% replacement for years to create the exact same strings (and more).
I've added the warning for now as it helps to identify what needs to be changed and how. Especially that the breakage is hard to spot in some cases. Then sometime next year or so "^xxx" will be changed to calculate the bank bytes instead. |
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chatGPZ
Registered: Dec 2001
Posts: 11127 |
Quote:Keeping old cruft around doesn't make maintaining things easier.
you only say that because you don't like it =P |
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ready.
Registered: Feb 2003
Posts: 441 |
How could I use the same list feature but in a matrix way, so that lista is a matrix and no just a vector? |
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soci
Registered: Sep 2003
Posts: 474 |
Matrixes are just nested lists.
m = [[1,2],[3,4]]
lda #m[0,0]
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soci
Registered: Sep 2003
Posts: 474 |
Btw. in 1.54 I've added scoped loop directives. Now the second example in post #5 can be simplified to:
*= $1000
lista .bfor i = 0, i < 8, i += 1
label lda #i
.if i > 3
lbl2 nop
.fi
.next
.word lista.label ; all labels
.word lista[4].lbl2 ; the one from the 5th run |
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oziphantom
Registered: Oct 2014
Posts: 478 |
This new feature is handy for avoiding the "I used a" trap ;)
aka
.for a = 0, a < 10 , a += 2
then later
lsr a
.warning Invalid addressing mode |
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soci
Registered: Sep 2003
Posts: 474 |
The loop related calculations are not scoped. This is so you can update an existing variable created somewhere above and that the loop variable is available later for checks/further continuation loops.
Such unfortunate name choices should be avoided. Using -Wshadow can help with that. |
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ready.
Registered: Feb 2003
Posts: 441 |
thanks for the replies, they've been really useful.
Now I take it to an even further level.
Let's say I need a multiple index label, so far I only need a vector of labels, thus: LABEL[0], LABEL[1], LABEL[2]....
But how can I implement a matrix of labels, thus
LABEL[0][0], LABEL[0][1],....
LABEL[1][0], LABEL[1][1],...
LABEL[2][0], LABEL[2][1],...
Somthing like:
FRAME := [][][]
.FOR FRAME=0,FRAME<=6,FRAME=FRAME+2
.FOR ZOOM=1,ZOOM<=3,ZOOM=ZOOM+1
FRAME .= [FRAME],[ZOOM]
.binary .....
.NEXT
.NEXT |
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soci
Registered: Sep 2003
Posts: 474 |
You need to nest them. For the exact style you want:
FRAMES := []
.FOR FRAME=0, FRAME<=6, FRAME += 2
ZOOMS := []
.FOR ZOOM=1, ZOOM<=3, ZOOM += 1
- .binary .....
ZOOMS ..= [-] ; collect in zooms
.NEXT
FRAMES ..= [ZOOMS] ; collect zooms in frames
.NEXT
lda #<FRAMES[2][0]
ldx #>FRAMES[2][0]
However I would do this instead:
FRAMES .BFOR FRAME IN RANGE(0, 7, 2)
ZOOMS .BFOR ZOOM IN RANGE(1, 4)
.binary .....
.NEXT
.NEXT
lda #<FRAMES[2].ZOOMS[0]
ldx #>FRAMES[2].ZOOMS[0]
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