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xmas2016: more optimization
This commit is contained in:
Vince Weaver
parent
d474040437
commit
f07631c25c
@ -184,6 +184,7 @@ NEXT = $02
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COUNTH = $03
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COUNTL = $04
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OFFSCREEN = $05
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FLIPHIGH = $06
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;===========================================
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;===========================================
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@ -196,13 +197,15 @@ 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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; 12 set fliphigh
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; 6 check keypress
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; 64*left_one_loop 6+2945
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; 23 (increments)
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; 29 increment counts
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; 22 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+(2951)))
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; total time = 14 + 140*(10+12+6+22+10+64*(41+23+(2951)))
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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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@ -211,6 +214,7 @@ OFFSCREEN = $05
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; 28,813,247 cycles = roughly 29s -- use X register for NEXT
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; 28,813,247 cycles = roughly 29s -- use X register for NEXT
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; 27,031,274 cycles = roughly 27s -- save LAST / skip OUTL
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; 27,022,814 cycles = roughly 27s -- move some things around
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scroll_hgr_left:
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lda #$0 ; 2
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@ -218,6 +222,7 @@ scroll_hgr_left:
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sta COUNTL ; 3
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;===========
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; 8
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; repeats 140 times
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scroll_hgr_loop:
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lda #$40 ; 2
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@ -228,20 +233,45 @@ scroll_hgr_smc:
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;============
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; 10
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; 0 000 00
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; 1 001 01
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;*2 010 10
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; 3 011 11
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; 4 100 00
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; 5 101 01
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;*6 110 10
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; Sets FLIPHIGH if we are on 2nd or 6th iteration out of 7
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lda COUNTL ; 3
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and #$3 ; 2
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sec ; 2
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sbc #2 ; 2
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sta FLIPHIGH ; 3
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;===========
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; 12
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lda KEYPRESS ; 4
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bmi scroll_done ; 3
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; -1
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;============
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; 6
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; repeats 64 times, once for east hline of 1/3 the screen
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left_one_loop:
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; scroll first page
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jsr hgr_scroll_line ; 6+???
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jsr hgr_scroll_line ; 6+????
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;============
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; 6+2*???
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; 6+????
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clc ; 2
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lda OUTL ; 3
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adc #$80 ; 2
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sta OUTL ; 3
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lda OUTH ; 3
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adc #$0 ; 2
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sta OUTH ; 3
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@ -252,10 +282,8 @@ left_one_loop:
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; 23
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; -1
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lda KEYPRESS ; 4
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bmi scroll_done ; 3
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; -1
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inc COUNTL ; 5
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lda COUNTL ; 3
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cmp #7 ; 2
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@ -266,7 +294,7 @@ left_one_loop:
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inc COUNTH ; 5
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;===========
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; 29
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; 22
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scroll_noinc_counth:
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lda COUNTH ; 3
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@ -285,7 +313,7 @@ scroll_done:
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; hgr_scroll_line
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;===========================================
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;
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; 86 init
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; 93 init
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; 10* (unrolled)
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; 3* hgr_scroll_line_loop: 10
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; high bit 20
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@ -306,7 +334,7 @@ scroll_done:
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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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; (68*3 + 73*1 + 7)*10+105= 2945 -- use LAST instead of load
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; (68*3 + 73*1 + 7)*10+112= 2952 -- use LAST instead of load
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hgr_scroll_line:
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setup_column_40:
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@ -403,15 +431,20 @@ done_count:
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;===========
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; 14
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lda (OUTL),Y ; get pixel block of interest ; 5
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tax
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lda (OUTL),Y ; get initial NEXT ; 5
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tax ; 2
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;===========
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; 7
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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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stx CURRENT ; 3
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stx CURRENT ; CURRENT=NEXT ; 3
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lda (INL),Y ; get subsequent pixel block ; 5
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tax ; NEXT ; 2
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@ -421,23 +454,37 @@ hgr_scroll_line_loop:
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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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lda FLIPHIGH ; 3 3 ; 3
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bne keep_high_bit0 ; 3 2 ; 3
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move_high_bit0:
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; -1
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txa ; NEXT ; 2
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jmp done_high_bit0 ; 3
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txa ; NEXT ; 2 ; 2
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jmp done_high_bit0 ; 3 ; 3
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keep_high_bit0:
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lda CURRENT ; 3
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lda CURRENT ; 3 ; 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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and #$80 ; 2 2 ; 2
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sta HIGH ; 3 3 ; 3
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;===================
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; 2or6: 20
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; else: 18
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; 2or6: 15
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; else: 14
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.if 0
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high_bit0:
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lda FLIPHIGH ; 3 3 ; 3
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beq keep_high_bit0 ; 2 3 ; 3
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; -1
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lda CURRENT ; 3 ; 3
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.byte $24 ; 3 ; 3
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keep_high_bit0:
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txa ; NEXT ; 2 ; 2
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done_high_bit0:
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and #$80 ; 2 2 ; 2
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sta HIGH ; 3 3 ; 3
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;===================
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; 2or6: 13
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; else: 16
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.endif
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prepare_bits0:
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@ -482,9 +529,7 @@ output_new0:
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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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lda FLIPHIGH ; 3
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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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@ -496,8 +541,8 @@ 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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; 2or6: 15
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; else: 14
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prepare_bits1:
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@ -542,9 +587,7 @@ output_new1:
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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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lda FLIPHIGH ; 3
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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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@ -556,8 +599,8 @@ 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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; 2or6: 15
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; else: 14
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prepare_bits2:
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@ -611,9 +654,7 @@ done_thirtynine:
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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_bit:
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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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lda FLIPHIGH ; 3
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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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@ -625,8 +666,8 @@ done_high_bit:
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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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; 2or6: 15
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; else: 14
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prepare_bits:
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