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xmas2018: scrolling optimizing
This commit is contained in:
Vince Weaver
parent
fd1377c10c
commit
cd6d5e9f4c
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@ -196,17 +196,18 @@ 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+3651
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; 64*left_one_loop 6+3225
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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+(3657)))
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; total time = 14 + 140*(10+29+10+64*(41+23+(3225)))
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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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scroll_hgr_left:
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lda #$0 ; 2
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@ -282,11 +283,16 @@ scroll_done:
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;===========================================
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;
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; 86 init
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; 40*
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; hgr_scroll_line_loop: 25
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; high bit 20
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; prepare bits: 16
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; output new byte: 21
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; 10* (unrolled)
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; 3* hgr_scroll_line_loop: 16
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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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; high bit 20
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; prepare bits: 16
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; output new byte: 23
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; 1*
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; increment and loop: 7
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; 5 return
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;
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@ -294,7 +300,8 @@ 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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hgr_scroll_line:
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setup_column_40:
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@ -383,8 +390,204 @@ done_count:
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; best case(0)= 19
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; worse case(3)= 56
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; repeated 40 times
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ldx OUTL ; 3
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inx ; 2
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stx INL ; 3
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ldx OUTH ; 3
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stx INH ; 3
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;===========
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; 14
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; repeated 10 times
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hgr_scroll_line_loop:
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;============= Unroll 0
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lda (OUTL),Y ; get pixel block of interest ; 5
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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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;===================
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; 20
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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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high_bit0:
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lda COUNTL ; 3
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and #$3 ; 2
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cmp #2 ; 2
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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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jmp done_high_bit0 ; 3
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keep_high_bit0:
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lda CURRENT ; 3
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done_high_bit0:
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and #$80 ; 2
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sta HIGH ; 3
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;===================
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; 2or6: 20
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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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; 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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;==========
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; 16
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output_new0:
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; get current, mask off bottom 2 bits (no longer needed)
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; then OR in the saved high (color) bit as well as NEXT bits
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lda CURRENT ; 3
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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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;============= Unroll 1
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lda (OUTL),Y ; get pixel block of interest ; 5
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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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;===================
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; 20
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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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high_bit1:
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lda COUNTL ; 3
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and #$3 ; 2
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cmp #2 ; 2
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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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jmp done_high_bit1 ; 3
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keep_high_bit1:
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lda CURRENT ; 3
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done_high_bit1:
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and #$80 ; 2
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sta HIGH ; 3
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;===================
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; 2or6: 20
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; else: 18
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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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; 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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;==========
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; 16
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output_new1:
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; get current, mask off bottom 2 bits (no longer needed)
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; then OR in the saved high (color) bit as well as NEXT bits
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lda CURRENT ; 3
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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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;============= Unroll 2
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lda (OUTL),Y ; get pixel block of interest ; 5
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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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;===================
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; 16
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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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high_bit2:
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lda COUNTL ; 3
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and #$3 ; 2
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cmp #2 ; 2
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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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jmp done_high_bit2 ; 3
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keep_high_bit2:
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lda CURRENT ; 3
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done_high_bit2:
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and #$80 ; 2
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sta HIGH ; 3
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;===================
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; 2or6: 20
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; else: 18
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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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; 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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;==========
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; 16
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output_new2:
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; get current, mask off bottom 2 bits (no longer needed)
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; then OR in the saved high (color) bit as well as NEXT bits
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lda CURRENT ; 3
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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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;============= Unroll 3
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lda (OUTL),Y ; get pixel block of interest ; 5
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sta CURRENT ; 3
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@ -395,13 +598,11 @@ thirtynine:
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lda OFFSCREEN ; 3
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jmp done_thirtynine ; 3
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not_thirtynine:
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iny ; 2
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lda (OUTL),Y ; get subsequent pixel block ; 5
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dey ; 2
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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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;===================
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; usually: 25
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; usually: 21
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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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@ -449,14 +650,18 @@ output_new:
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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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;===========
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; 21
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iny ; 2
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;===========
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; 23
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cpy #40 ; 2
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bne hgr_scroll_line_loop ; 3
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beq hgr_scroll_return ; 3
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; -1
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jmp hgr_scroll_line_loop ; 3
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;===========
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; 7
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hgr_scroll_return:
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; -1
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rts ; 6
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