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Atari coding BBS
| Re: Optimisation question |
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Posted by: evil
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May,03.2012-14:43
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As Mikro said, do 60-61 movem.l in a rept, and use a loop around that to keep everything in i-cache (I think Mikro forgot about the subq / bpl for looping, can't use registers for that as they are used by the movem's).
Also don't use the blitter. It's far slower to copy data with than the processor. And it's not running in parallell, just like on STe it hogs the bus while working. Another drawback is incompatibility with a) bus speeders and b) fastram.
To use a7 is dubious, it depends if you have filesystem things going on while your routine is working, then do not shut off all int's and use a7. Otherwise I guess it would work.
Example:
copyrout:
move.w sr,-(a7)
move.w #$2700,sr ; stop all interrupts
move.l a7,.savea7
lea source,a6
lea dest,a7
move.w #num,.cnt
.loop:
rept 60
movem.l (a6)+,d0-a5
movem.l d0-a5,-(a7)
endr
subq.w #1,.cnt
bpl .loop
move.l .savea7,a7
move.w (a7)+,sr
rts
.cnt: dc.w 0
.savea7: dc.l 0
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Topic
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Posted by
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Date
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Optimisation question
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Sallafranque/Thadoss
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May,02.2012-19:07
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Re: Optimisation question
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Sallafranque/Thadoss
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May,02.2012-19:10
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Re: Optimisation question
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Cyprian
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May,02.2012-19:39
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Re: Optimisation question
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Bod/STAX
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May,02.2012-22:02
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Re: Optimisation question
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evil
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May,03.2012-14:43
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Re: Optimisation question
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evil
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May,03.2012-17:16
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Re: Optimisation question
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defjam
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May,03.2012-17:33
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Re: Optimisation question
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mikro
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May,03.2012-10:11
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Re: Optimisation question
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mikro
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May,03.2012-10:12
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Re: Optimisation question
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gloky
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May,03.2012-03:50
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Re: Optimisation question
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Sallafranque/Thadoss
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May,03.2012-18:46
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Re: Optimisation question
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ggn
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May,04.2012-08:01
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Re: Optimisation question
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gloky
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May,04.2012-17:16
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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