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Forums > C64 Coding > Code indenting
2017-09-11 07:40
oziphantom

Registered: Oct 2014
Posts: 174
Code indenting

I've always been a strict
label code comment
kinda guy but of late I've been experimenting with code readability and speed boosts. Indenting does seem to improve things
updateMovement
	ldx Ents.movementPtr
-	lda YXDeltas,x
	cmp #$AA
	bne +
	ldx Ents.movementPtrBase
	stx Ents.movementPtr
	jmp -
+	clc
	adc Ents.y
	sta Ents.y
	inx	
	lda YXDeltas,x
	beq _endAdd
	bmi _sub
	clc
	adc Ents.x
	sta Ents.x
	bcc _endAdd
	inc Ents.xMSB
	jmp _endAdd
_sub
	clc
	adc Ents.x
	sta Ents.x
	lda Ents.xMSB
	adc #$ff
	sta Ents.xMSB
_endAdd
	inx
	stx Ents.movementPtr
	rts
vs
updateMovement
	ldx Ents.movementPtr
-	lda YXDeltas,x
	cmp #$AA
	bne +
	    ldx Ents.movementPtrBase
	    stx Ents.movementPtr
	jmp -
+	clc
	adc Ents.y
	sta Ents.y
	inx	
	lda YXDeltas,x
	beq _endAdd
	    bmi _sub
                clc
                adc Ents.x
                sta Ents.x
                bcc _endAdd
                    inc Ents.xMSB
                    jmp _endAdd
       _sub
            clc
            adc Ents.x
            sta Ents.x
            lda Ents.xMSB
            adc #$ff
            sta Ents.xMSB
_endAdd
	inx
	stx Ents.movementPtr
	rts
this kind of falls apart when you get the to the leap frog code. I.e something like
bmi C
beq B
A
A
A
bne C
A
A
jmp D
B
B
B
B
beq D
C
C
C
C
D
D
D
So I was wondering if anybody else had tumbled down this rabbit hole or had other things to do to help?
 
... 13 posts hidden. Click here to view all posts....
 
2017-09-11 12:06
dano

Registered: Jul 2004
Posts: 131
What Cruzer said.
2017-09-11 12:18
Groepaz

Registered: Dec 2001
Posts: 8548
not a single label named "shit". unreadable.
2017-09-11 12:46
Mr. SID

Registered: Jan 2003
Posts: 348
You lost me at the + and - labels... :)
2017-09-11 13:16
Oswald

Registered: Apr 2002
Posts: 4242
I still hate all that branching going on, why not just 16 bit math?

bmi case:

+3 cycle bmi -2 cycle at adc # = +1 cycle slower than adc abs,x

bpl case:

not taken branch:2
not taken bcc: 2
inc 5
jmp 4

13 cycles = +1 cycle slower than lda adc sta (Each 4)


only 1 case its faster.

instead of #$aa it could be a dec counter bmi.
2017-09-11 16:28
Perplex

Registered: Feb 2009
Posts: 209
Quoting Cruzer
The only time it makes sense to indent asm code is if it's in curly brackets, e.g. because of an if-statement or for-loop.


This.
2017-09-12 00:17
Skate

Registered: Jul 2003
Posts: 470
C64 has no tab key for a reason. :)
2017-09-12 00:51
Groepaz

Registered: Dec 2001
Posts: 8548
and TASS already auto-idents the way god intended!
2017-09-12 07:32
oziphantom

Registered: Oct 2014
Posts: 174
Quoting Perplex
Quoting Cruzer
The only time it makes sense to indent asm code is if it's in curly brackets, e.g. because of an if-statement or for-loop.


This.


Python, Ruby et al ?
2017-09-12 07:44
oziphantom

Registered: Oct 2014
Posts: 174
Quoting Skate
C64 has no tab key for a reason. :)


And the C128 does for a reason ;) The Kernal even has Tab Stops build in.
2017-09-15 19:37
Skate

Registered: Jul 2003
Posts: 470
Quote: Quoting Skate
C64 has no tab key for a reason. :)


And the C128 does for a reason ;) The Kernal even has Tab Stops build in.


We are free to use indenting for our C128 projects then, good to know.

I have a C128 but it will take a few more decades until i need that much memory and speed. ;)
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