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xmas2016: optimizing a little
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commit
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@ -304,15 +304,14 @@ scroll_done:
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;
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; 2 init
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; 40*
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; hgr_scroll_line_loop: 20
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; high bit 22
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; get_offpage_byte: 5
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; hgr_scroll_line_loop: 25
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; high bit 20
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; prepare bits: 18
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; output new byte: 21
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; increment and loop: 7
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; 5 return
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;
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; original total = (93*40)+7=3727
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; (93*40)+7=3727 -- original total
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;
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hgr_scroll_line:
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@ -323,36 +322,35 @@ hgr_scroll_line:
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hgr_scroll_line_loop:
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lda (OUTL),Y ; get pixel block of interest ; 5
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sta CURRENT ; 3
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iny ; 2
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lda (OUTL),Y ; get subsequent pixel block ; 5/6 if off end
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sta NEXT ; 3
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dey ; restore Y ; 2
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;============
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; 20
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get_offpage_byte:
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cpy #39 ; 2
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bne not_thirtynine ; 3
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sty TEMPY ; 3
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thirtynine:
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; -1
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sty TEMPY ; save Y ; 3
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ldy #0 ; 2
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lda (INL),Y ; 5
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sta NEXT ; 3
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ldy TEMPY ; 3
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ldy TEMPY ; restore Y ; 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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done_thirtynine:
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sta NEXT ; 3
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;===================
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; usually: 5
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; usually: 25
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; rarely: 31
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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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beq move_high_bit ; 3
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cmp #6 ; -1,2
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beq move_high_bit ; 3
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bne keep_high_bit ; -1,3
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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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lda NEXT ; 3
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jmp done_high_bit ; 3
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keep_high_bit:
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@ -361,7 +359,8 @@ 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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; worst: 22
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; 2or6: 20
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; else: 18
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prepare_bits:
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