ASM Modulus? - ASM & Related Topics

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ASM Modulus?

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KilloZapit
Fishin' Lakitu

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Since: 2007-09-01 10:07:46 PM
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Posted on 2007-09-23 02:15:34 AM

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How would you go about doing a modulus in asm anyway? XD I am makeing a sprite that I think will use the X coord as a peramiter like some of the normal ones do.

smkdan
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Posted on 2007-09-23 02:31:15 AM

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The SNES has hardware multiply / divide (with remainders).

Code

4204 wl++++ WRDIVL - Dividend C low byte 4205 wh++++ WRDIVH - Dividend C high byte dddddddd dddddddd 4206 wb++++ WRDIVB - Divisor B bbbbbbbb Write $4204/5, then $4206. 16 "machine cycles" (probably 96 master cycles) after $4206 is set, the quotient may be read from $4214/5, and the remainder from $4216/7. Presumably, $4204/5 are not altered by this process, much like $4202. The division is unsigned. Division by 0 gives a quotient of $FFFF and a remainder of C.

I guess you'll be making use of the remainder there.

KilloZapit
Fishin' Lakitu

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Posted on 2007-09-23 02:58:00 AM

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so what, I have to insert code to delay untill it's done or will it do it it's self?

smkdan
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Posted on 2007-09-23 03:36:22 AM

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You have to delay with instructions. 8 NOPS for divide and 4 for multiply is in order unless you have something to do within the wait period.

KilloZapit
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Posted on 2007-09-23 04:17:07 AM

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I might, but does it take EXACTLY that long?

smkdan
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Posted on 2007-09-23 04:21:19 AM

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It's a safe limit..

KilloZapit
Fishin' Lakitu

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Posted on 2007-09-23 05:19:17 AM

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Bah It's not working as I expected and it takes a bunch of code to do what I want, so I will just make multible custom sprites I guess.

Bah! dosn't sprite tool have a way of makeing sprites which use the las sprites code pointer without reassmembleing the code? =_=

Last edited on 2007-09-23 05:39:46 AM by KilloZapit.

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