gbadev : Message: slow instructions on GBA

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slow instructions on GBA

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Message #12323 of 15019 |

Hi,

As I know, the modulo (x%y) and division (x/y) instructions are fairly slow on
GBA.
Are there any other instructions or program sequences to avoid on GBA
(especially in Vblan kinterrupt)? If yes, do you know alternative methods (like
bit shifting to increase the speed of multiplying by 2,4,8...) for them?

If there are any documents about these instructions (can be non GBA specific
too), I would be glad to hear about it.

Regards,

SzabFer

Fri Aug 2, 2002 12:41 pm

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"Szabo Ferenc" <szabfer@...>

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Message #12323 of 15019 |

Expand Messages	Author	Sort by Date
Hi, As I know, the modulo (x%y) and division (x/y) instructions are fairly slow on GBA. Are there any other instructions or program sequences to avoid on GBA...	Szabo Ferenc szabfer	Aug 2, 2002 11:54 am
... Square root. I think on devrs.com there's a link to page with tricks for fast sqrt. Frankly saying for the present I'm using the BIOS one, but now I wonder...	Maciej Sinilo yarpen2002	Aug 2, 2002 12:25 pm
... slow on GBA. Modulo and division are relatively slow on the AGB as it has no hardware divide unit, however they are not so slow they are going to screw up ...	James Boulton jim@...	Aug 2, 2002 12:37 pm
On 2 Aug 2002 at 13:15, James Boulton wrote: [snip] ... That's a very good advice. After all, as we all know, "premature optimization is the root of all evil"...	Maciej Sinilo yarpen2002	Aug 2, 2002 12:46 pm
... if you use GCC, here something else to be aware of: another major slowdown/bloat thing is using u8/s8/u16/s16 when don't HAVE to use them... if you don't...	Markus Glanzer vampy2000.geo	Aug 2, 2002 12:52 pm
it is exactly the same for parameters in functions: void f(u32) {} is better than f(u16) {} for the same reasons. Christian VOTAVA Responsable du...	Christian Votava cvotava@...	Aug 2, 2002 2:54 pm

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