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xmas2018: more scrolling optimization
This commit is contained in:
Vince Weaver
parent
cd6d5e9f4c
commit
5353c8814b
@ -196,18 +196,19 @@ OFFSCREEN = $05
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; Timing
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; scroll_hgr_left: 8
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; 140* scroll_hgr_loop: 10 setup
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; 64*left_one_loop 6+3225
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; 64*left_one_loop 6+3145
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; 23 (increments)
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; 29 increment counts
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; 10 check and loop
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; 6 return
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; total time = 14 + 140*(10+29+10+64*(41+23+(3225)))
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; total time = 14 + 140*(10+29+10+64*(41+23+(3151)))
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; 67,431,293 cycles = roughly 67s -- original
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; 64,564,093 cycles = roughly 64s -- optimize inner loop a bit
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; 33,347,034 cycles = roughly 33s -- don't shift hidden page
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; 30,569,434 cycles = roughly 30s -- unroll 4 times
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; 29,476,314 cycles = roughly 29s -- add back INH for +1 address
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; 28,813,247 cycles = roughly 29s -- use X register for NEXT
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scroll_hgr_left:
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lda #$0 ; 2
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@ -284,14 +285,14 @@ scroll_done:
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;
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; 86 init
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; 10* (unrolled)
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; 3* hgr_scroll_line_loop: 16
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; 3* hgr_scroll_line_loop: 15
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; high bit 20
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; prepare bits: 16
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; output new byte: 23
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; 1* hgr_scroll_line_loop: 21
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; prepare bits: 18
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; output new byte: 20
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; 1* hgr_scroll_line_loop: 20
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; high bit 20
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; prepare bits: 16
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; output new byte: 23
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; prepare bits: 18
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; output new byte: 20
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; 1*
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; increment and loop: 7
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; 5 return
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@ -300,8 +301,9 @@ scroll_done:
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; (91*40)+7=3647 -- remove branch in highbit code
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; (89*40)+7=3567 -- convert 5 asl to 4 ror
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; (89*40)+91=3651 -- re-write with col40 pre-calculated
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; (79*3 + 84*1 + 7)*10+91 = 3341
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; (75*3 + 80*1 + 7)*10+105= 3225
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; (79*3 + 84*1 + 7)*10+91 = 3341 -- unroll 4 times
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; (75*3 + 80*1 + 7)*10+105= 3225 -- move to INL=OUTL+1
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; (73*3 + 78*1 + 7)*10+105= 3145 -- use X register for next
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hgr_scroll_line:
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setup_column_40:
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@ -407,9 +409,9 @@ hgr_scroll_line_loop:
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sta CURRENT ; 3
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lda (INL),Y ; get subsequent pixel block ; 5
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sta NEXT ; 3
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tax ; NEXT ; 2
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;===================
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; 20
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; 15
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; if in bit 2 or 6 of horiz scroll, shift the color bit over
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; makes some color flicker, is there a better way?
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@ -420,7 +422,7 @@ high_bit0:
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bne keep_high_bit0 ; 3
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move_high_bit0:
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; -1
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lda NEXT ; 3
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txa ; NEXT ; 2
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jmp done_high_bit0 ; 3
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keep_high_bit0:
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lda CURRENT ; 3
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@ -432,19 +434,20 @@ done_high_bit0:
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; else: 18
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prepare_bits0:
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; get right byte, bottom 2 bits, shifted left to be in 6+5
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lda NEXT ; 3
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txa ; NEXT ; 2
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; this method 2 cycles faster than asl x 5
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ror ; 2
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ror ; 2
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ror ; 2
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ror ; 2
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and #$60 ; 2
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sta NEXT ; 3
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ora HIGH ; 3
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sta HIGH ; 3
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;==========
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; 16
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; 18
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output_new0:
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; get current, mask off bottom 2 bits (no longer needed)
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@ -454,12 +457,11 @@ output_new0:
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lsr ; 2
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and #$1f ; 2
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ora HIGH ; 3
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ora NEXT ; 3
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sta (OUTL),Y ; 6
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iny ; 2
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;===========
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; 23
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; 20
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@ -469,9 +471,9 @@ output_new0:
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sta CURRENT ; 3
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lda (INL),Y ; get subsequent pixel block ; 5
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sta NEXT ; 3
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tax ; NEXT ; 2
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;===================
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; 20
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; 15
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; if in bit 2 or 6 of horiz scroll, shift the color bit over
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; makes some color flicker, is there a better way?
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@ -482,7 +484,7 @@ high_bit1:
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bne keep_high_bit1 ; 3
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move_high_bit1:
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; -1
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lda NEXT ; 3
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txa ; NEXT ; 2
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jmp done_high_bit1 ; 3
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keep_high_bit1:
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lda CURRENT ; 3
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@ -496,17 +498,17 @@ done_high_bit1:
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prepare_bits1:
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; get right byte, bottom 2 bits, shifted left to be in 6+5
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lda NEXT ; 3
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txa ; NEXT ; 2
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; this method 2 cycles faster than asl x 5
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ror ; 2
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ror ; 2
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ror ; 2
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ror ; 2
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and #$60 ; 2
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sta NEXT ; 3
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ora HIGH ; 3
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sta HIGH ; 3
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;==========
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; 16
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; 18
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output_new1:
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; get current, mask off bottom 2 bits (no longer needed)
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@ -516,12 +518,11 @@ output_new1:
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lsr ; 2
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and #$1f ; 2
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ora HIGH ; 3
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ora NEXT ; 3
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sta (OUTL),Y ; 6
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iny ; 2
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;===========
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; 23
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; 20
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@ -531,9 +532,9 @@ output_new1:
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sta CURRENT ; 3
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lda (INL),Y ; get subsequent pixel block ; 5
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sta NEXT ; 3
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tax ; NEXT ; 2
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;===================
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; 16
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; 15
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; if in bit 2 or 6 of horiz scroll, shift the color bit over
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; makes some color flicker, is there a better way?
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@ -544,7 +545,7 @@ high_bit2:
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bne keep_high_bit2 ; 3
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move_high_bit2:
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; -1
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lda NEXT ; 3
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txa ; NEXT ; 2
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jmp done_high_bit2 ; 3
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keep_high_bit2:
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lda CURRENT ; 3
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@ -558,17 +559,17 @@ done_high_bit2:
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prepare_bits2:
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; get right byte, bottom 2 bits, shifted left to be in 6+5
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lda NEXT ; 3
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txa ; NEXT ; 2
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; this method 2 cycles faster than asl x 5
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ror ; 2
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ror ; 2
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ror ; 2
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ror ; 2
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and #$60 ; 2
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sta NEXT ; 3
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ora HIGH ; 3
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sta HIGH ; 3
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;==========
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; 16
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; 18
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output_new2:
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; get current, mask off bottom 2 bits (no longer needed)
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@ -577,13 +578,13 @@ output_new2:
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lsr ; 2
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lsr ; 2
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and #$1f ; 2
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ora HIGH ; 3
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ora NEXT ; 3
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sta (OUTL),Y ; 6
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iny ; 2
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;===========
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; 23
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; 20
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;============= Unroll 3
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@ -600,9 +601,9 @@ thirtynine:
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not_thirtynine:
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lda (INL),Y ; get subsequent pixel block ; 5
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done_thirtynine:
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sta NEXT ; 3
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tax ; NEXT ; 2
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;===================
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; usually: 21
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; usually: 20
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; rarely: 18
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; if in bit 2 or 6 of horiz scroll, shift the color bit over
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@ -614,7 +615,7 @@ high_bit:
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bne keep_high_bit ; 3
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move_high_bit:
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; -1
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lda NEXT ; 3
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txa ; NEXT ; 2
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jmp done_high_bit ; 3
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keep_high_bit:
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lda CURRENT ; 3
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@ -628,17 +629,17 @@ done_high_bit:
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prepare_bits:
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; get right byte, bottom 2 bits, shifted left to be in 6+5
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lda NEXT ; 3
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txa ; NEXT ; 2
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; this method 2 cycles faster than asl x 5
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ror ; 2
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ror ; 2
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ror ; 2
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ror ; 2
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and #$60 ; 2
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sta NEXT ; 3
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ora HIGH ; 3
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sta HIGH ; 3
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;==========
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; 16
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; 18
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output_new:
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; get current, mask off bottom 2 bits (no longer needed)
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@ -648,12 +649,11 @@ output_new:
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lsr ; 2
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and #$1f ; 2
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ora HIGH ; 3
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ora NEXT ; 3
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sta (OUTL),Y ; 6
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iny ; 2
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;===========
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; 23
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; 20
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cpy #40 ; 2
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