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Atari demoscene BBS
| Re: Line rout |
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Posted by: corbo
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Sep,27.2011-19:33
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just 'cause i like this conversation :) - Sorry if i'm boring you
- Chuck asked me to code a line rout, but i don't have the time... it's very frustrating!
the "main loop" code is like:
.downwardYMajor_run
move.l d0,d4 ; 4
add.l d1,d0 ; 8
move.l d0,d5 ; 4
swap d4 ; 4
swap d5 ; 4
lsl.w #4,d5 ; 16
or.w d5,d4 ; 4
add.w d4,d4 ; 4
move.w (a2,d4.w),d4 ; 16
jmp (a3,d4.w) ; 16
; 16x ORI.w #xxxx,yyyy(a0) ; 256
; add.w #imm,a0 ; 12
; jmp (a1) ; 8
.downwardYMajor_runDone
sub.w #SegmentedLine_RunLength,d3 ; 8
bge.s .downwardYMajor_run ; 8 or 12
; = 372
you can "pre-cache" the result of (a3, d4.w), with 12 more cycles per 16 pixels
(replace jmp (a3, d4.w) by move.l (a3, d4.w), (an)+)
You need to init d0-d7 (4*8 cycles = 32)
You save 64 cycles per 16 pixels.
a4: your "pre-cache":
you need a move.l (a4)+, a1 //16 cycles
then jmp (a1)
so, you earn 64 - (12 + 32 + 16) for the first 16 pixels = 4 cycles
for the next, you earn 64 - (12 + 16) = 36 cycles
after that, i don't consider the last modulo 16 pixels (i ponder about auto-modified code. It can be great for that... not on falcon, sure).
Only for the last mod 16 pixels, I think for line < 32 pixels, it's not interesting.
hoplà
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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Line rout
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Chuck
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Sep,08.2011-18:49
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Re: Line rout
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ggn
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Sep,08.2011-21:14
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Re: Line rout
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Chuck/Dune
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Sep,08.2011-23:21
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Re: Line rout
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Leonard
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Sep,09.2011-11:47
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Re: Line rout
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Mr.Styckx
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Sep,09.2011-18:24
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Re: Line rout
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chuck
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Sep,09.2011-22:31
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Re: Line rout
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ggn
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Sep,10.2011-15:57
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Re: Line rout
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ggn
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Sep,09.2011-19:55
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Re: Line rout
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Simon Sunnyboy / Paradize
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Sep,11.2011-16:58
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Re: Line rout
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rudis
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Sep,11.2011-17:58
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Re: Line rout
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Simon Sunnyboy / Paradize
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Sep,13.2011-14:18
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Line Rout
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Defjam
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Sep,10.2011-20:45
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Re: Line Rout
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Chuck/Dune
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Sep,11.2011-01:09
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Re: Line Rout
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Kalms
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Sep,13.2011-22:42
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Re: Line Rout
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Defjam
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Sep,14.2011-18:38
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Re: Line Rout
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Kalms
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Sep,14.2011-23:12
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Re: Line rout
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RA/pdx
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Sep,09.2011-23:35
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Re: Line rout
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PeP
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Sep,10.2011-20:14
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Re: Line rout
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Marcer
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Sep,10.2011-23:16
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Re: Line rout
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baah
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Sep,12.2011-10:23
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Re: Line rout
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baah
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Sep,12.2011-10:27
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Re: Line rout
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Chuck
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Sep,21.2011-21:36
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Re: Line rout
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Kalms
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Sep,22.2011-22:13
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Re: Line rout
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corbo
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Sep,23.2011-01:11
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Re: Line rout
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corbo
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Sep,23.2011-01:12
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Re: Line rout
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evil
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Sep,24.2011-11:04
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Re: Line rout
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Kalms
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Sep,26.2011-20:54
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Re: Line rout
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corbo
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Sep,27.2011-19:33
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Re: Line rout
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Kalms
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Sep,28.2011-14:46
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Re: Line rout
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Chuck/Dune
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Sep,24.2011-17:28
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Re: Line rout
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baah
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Oct,03.2011-19:27
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Re: Line rout
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Kalms
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Oct,03.2011-23:58
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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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