bubble: one more optimization round
This commit is contained in:
Vince Weaver
parent
d0fda8e44d
commit
de0c366e75
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@ -25,7 +25,13 @@
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; 817BE = inline/unroll the cosines
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; 817A7 = inline clear screen (now no stack usage)
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; 64987 = calc sine and cosine at same time = 2.5fps
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; 61827 = remove unnecessary stores
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; 5D7EF = add a cosine table
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; 5CFBE = move TL/TH out of zero page
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; 5C353 = put UL in Y = ~2.6fps
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; NUM=24 35CD3 = ~4.5fps
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; NUM=16 1A2DD = ~9 fps
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; soft-switches
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@ -51,39 +57,32 @@ GBASL = $26
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GBASH = $27
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HPLOTXL = $90
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HPLOTXH = $91
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HPLOTYL = $92
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HPLOTYH = $93
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IVL = $94
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IVH = $95
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RXL = $96
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RXH = $97
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OUT1L = $98
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OUT1H = $99
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OUT2L = $9A
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OUT2H = $9B
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STEMP1L = $9C
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STEMP1H = $9D
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STEMP2L = $9E
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STEMP2H = $9F
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STEMP1L = $98
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STEMP1H = $99
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STEMP2L = $9A
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I = $D0
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J = $D1
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XL = $D4
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XH = $D5
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VL = $D6
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VH = $D7
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TL = $DA
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TH = $DB
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UL = $DC
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UH = $DD
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XL = $D2
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XH = $D3
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VL = $D4
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VH = $D5
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;TL = $D6
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;TH = $D7
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UL = $D8
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UH = $D9
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HGR_PAGE = $E6
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; const
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NUM = 32
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;NUM = 32
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NUM = 24
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bubble:
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@ -106,8 +105,8 @@ bubble:
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sta XH
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sta VL
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sta VH
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sta TL
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sta TH
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; sta TL
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; sta TH
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;=========================
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;=========================
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@ -164,114 +163,133 @@ rl_smc:
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adc XH ; 3
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sta RXH ; 3
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no_rl_carry:
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; fixed_add(i,0,vh,vl,&ivh,&ivl);
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;=======================================
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; precalc I+V for later use
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; IV=I+V
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; this is 8.8 fixed point so bottom byte of I is 0
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; clc ; C should be 0 from prev ;
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lda VL ; 3
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sta IVL ; 3
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sta STEMP1L ; store IVL directly in sine input ; 3
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lda I ; 3
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adc VH ; 3
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sta IVH ; 3
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adc VH ; IVH is in A for sine ; 3
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;=========================
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; U=SIN(I+V)+SIN(RR+X)
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; V=COS(I+V)+COS(RR+X)
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lda IVL ; 3
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sta STEMP1L ; 3
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lda IVH ; 3
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; calc SIN(I+V) in STEMP1L/A
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.include "sin_unrolled.s"
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; / 6.28 is roughly the same as *0.16
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; = .5 .25 .125 .0625 .03125
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; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
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; i=(i*0x28)>>8;
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; A has STEMP1H
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; 01234567 89ABCDEF
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; 3456789A
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; + 56789ABC
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;=============
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; i2=i<<3;
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asl STEMP1L ; 5
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rol ; 2
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asl STEMP1L ; 5
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rol ; 2
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asl STEMP1L ; 5
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rol ; 2
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; i1=i<<5;
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ldx STEMP1L ; 3
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stx STEMP2L ; 3
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sta STEMP1H ; 3
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asl STEMP2L ; 5
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rol ; 2
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asl STEMP2L ; 5
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rol ; 2
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; i=(i1+i2)>>8;
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; We ignore the low byte as we don't need it
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; possibly inaccurate as we don't clear carry?
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adc STEMP1H ; 2
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tax ; 2
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; tradeoff size for speed by having lookup
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; table for sign bits
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; the sign lookup only saves like 2 cycles
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;==========================
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; U=sin(IV)
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lda sin_table_low,X ; 4
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sta UL ; 3
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lda sin_table_high,X ; 4
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sta UH ; 3
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txa
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clc
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adc #64
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tax
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;===========================
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; V=sin(IV)
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lda sin_table_low,X ; 4
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lda cos_table_low,X ; 4
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sta VL ; 3
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lda sin_table_high,X ; 4
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lda cos_table_high,X ; 4
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sta VH ; 3
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lda RXL ; 3
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sta STEMP1L ; 3
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lda RXH ; 3
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.include "sin_unrolled.s"
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clc
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lda UL
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adc sin_table_low,X
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sta UL
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lda UH
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adc sin_table_high,X
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sta UH
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;=====================
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; U+=sin(RX)
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txa
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clc
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adc #64
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tax
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.if 0
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; 1.57 is roughly 0x0192 in 8.8
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clc ; 2
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lda IVL ; 3
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adc #$92 ; 2
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sta STEMP1L ; 3
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lda UL ; 3
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adc sin_table_low,X ; 4
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tay ; UL in Y ; 2
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; sta UL ; 3
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lda UH ; 3
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adc sin_table_high,X ; 4
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sta UH ; 3
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lda IVH ; 4
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adc #1 ; 2
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;================
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; V+=cos(RX)
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.include "sin_unrolled.s"
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lda sin_table_low,X ; 4
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sta OUT1L ; 3
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lda sin_table_high,X ; 4
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sta OUT1H ; 3
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; 1.57 is roughly 0x0192 in 8.8
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clc ; 2
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lda RXL ; 3
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adc #$92 ; 2
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sta STEMP1L ; 3
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lda RXH ; 3
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adc #1 ; 2
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.include "sin_unrolled.s"
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.endif
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clc
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lda VL
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adc sin_table_low,X
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sta VL
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lda VH
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adc sin_table_high,X
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sta VH
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lda VL ; 3
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adc cos_table_low,X ; 4+
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sta VL ; 3
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lda VH ; 3
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adc cos_table_high,X ; 4+
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sta VH ; 3
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; X=U+T
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clc ; 2
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lda UL ; 3
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adc TL ; 3
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; lda UL ; 3
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tya ; UL in Y ; 2
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tl_smc:
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adc #0 ; 2
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sta XL ; 3
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lda UH ; 3
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adc TH ; 3
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th_smc:
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adc #0 ; 2
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sta XH ; 3
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;===========================================================
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; HPLOT 32*U+140,32*V+96
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; U can be destroyed as we don't use it again?
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; U can be destroyed as we don't use it again
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; 01234567 89ABCDEF
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@ -279,7 +297,9 @@ no_rl_carry:
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; we want 56789ABC, rotate right by 3 is two iterations faster?
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lda UL ; 3
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tya ; UL in Y ; 2
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; lda UL ; 3
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lsr UH ; 5
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ror ; 2
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@ -353,12 +373,12 @@ done_i:
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; carry always set here as we got here from a BEQ
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; (bcs=bge, bcc=blt)
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lda TL ; 3
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lda tl_smc+1 ; 4
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adc #$7 ; really 8, carry always set ; 2
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sta TL ; 3
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sta tl_smc+1 ; 4
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lda #0 ; 2
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adc TH ; 3
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sta TH ; 3
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adc th_smc+1 ; 4
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sta th_smc+1 ; 4
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end:
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; flip pages
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@ -388,6 +408,7 @@ sin_table_low:
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.byte $61,$67,$6D,$73,$78,$7E,$83,$88,$8E,$93,$98,$9D,$A2,$A7,$AB,$B0
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.byte $B4,$B9,$BD,$C1,$C5,$C9,$CD,$D1,$D4,$D8,$DB,$DE,$E1,$E4,$E7,$E9
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.byte $EC,$EE,$F0,$F3,$F4,$F6,$F8,$F9,$FB,$FC,$FD,$FE,$FE,$FF,$FF,$FF
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cos_table_low:
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.byte $FF,$FF,$FF,$FF,$FE,$FE,$FD,$FC,$FB,$F9,$F8,$F6,$F5,$F3,$F1,$EE
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.byte $EC,$EA,$E7,$E4,$E1,$DE,$DB,$D8,$D5,$D1,$CD,$C9,$C6,$C2,$BD,$B9
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.byte $B5,$B0,$AC,$A7,$A2,$9D,$98,$93,$8E,$89,$83,$7E,$78,$73,$6D,$68
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@ -400,11 +421,20 @@ sin_table_low:
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.byte $14,$16,$19,$1C,$1E,$21,$25,$28,$2B,$2F,$32,$36,$3A,$3E,$42,$47
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.byte $4B,$4F,$54,$59,$5E,$62,$67,$6C,$72,$77,$7C,$82,$87,$8D,$92,$98
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.byte $9E,$A4,$AA,$AF,$B5,$BB,$C2,$C8,$CE,$D4,$DA,$E0,$E7,$ED,$F3,$F9
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cos_table_low_tail:
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.byte $00,$06,$0C,$12,$19,$1F,$25,$2B,$31,$38,$3E,$44,$4A,$50,$56,$5C
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.byte $61,$67,$6D,$73,$78,$7E,$83,$88,$8E,$93,$98,$9D,$A2,$A7,$AB,$B0
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.byte $B4,$B9,$BD,$C1,$C5,$C9,$CD,$D1,$D4,$D8,$DB,$DE,$E1,$E4,$E7,$E9
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.byte $EC,$EE,$F0,$F3,$F4,$F6,$F8,$F9,$FB,$FC,$FD,$FE,$FE,$FF,$FF,$FF
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.align $100
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sin_table_high:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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cos_table_high:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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@ -417,6 +447,11 @@ sin_table_high:
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.byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
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.byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
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.byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
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cos_table_high_tail:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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rl:
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.byte $00,$06,$0C,$12,$19,$1F,$25,$2B
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