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tfv: inner loop optimization
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@ -838,7 +838,7 @@ match:
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ram[SCREEN_X]++;
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if (ram[SCREEN_X] >= LOWRES_W) break;
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cycles.mode7+=43;
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cycles.mode7+=41;
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/* cache last value */
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@ -186,5 +186,19 @@ In-line unsigned multiply inside of signed multiply (save 12 cycles)
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Frame Rate = 5.42 fps
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Have loop counter count down from 40 instead of count up (avoid compare)
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Cycles: flying= 187
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Cycles: getkey= 46
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Cycles: page_flip= 26
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Cycles: multiply= 40,888
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Cycles: mode7= 115,538
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Cycles: lookup_map= 22,747
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Cycles: put_sprite= 2,561
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================================
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Total = 181,993
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Frame Rate = 5.49 fps
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Each cycle removed from inner X loop saves
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32*40=1280 cycles
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@ -935,8 +935,7 @@ calc_horizontal_scale:
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; brk ; space_y = f7:04
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; FIXME: start at 40 and decrement?
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ldx #0 ; was SCREEN_X ; 2
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ldx #40 ; was SCREEN_X ; 2
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;==========
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; 22
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screenx_loop:
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@ -994,11 +993,10 @@ dyi_label:
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adc #0 ; 2
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sta SPACEY_I ; 3
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inx ;inc SCREEN_X ; 2
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cpx #40 ; LOWRES width ; 2
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beq done_screenx_loop ; 2nt/3
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dex ; decrement SCREEN_X ; 2
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beq done_screenx_loop ; branch until we've done 40 ; 2nt/3
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;=============
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; 43
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; 41
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; cache color and return if same as last time
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