Improve performance of line_down from 837970 to 835768 (cpu cyceles of a test)
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2 changed files with 7 additions and 3 deletions
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@ -77,7 +77,9 @@ increment_pixel_x:
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BCC increment_pixel_x_end; We need to move to the next chunk
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move_8px_left:
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;; Next chunk is 8 addresses away. Look in pixel_draw for more detail.
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Add_16 >btp_mem_pos, <btp_mem_pos, #$08, #$00
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;; -8.
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;; C = 1 therefore you se 07
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Add_16 >btp_mem_pos, <btp_mem_pos, #$07, #$00, !
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;; Restores byte to paint
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LDA #%10000000
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STA byte_to_paint
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@ -101,7 +103,9 @@ increment_y_pos:
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move_8px_down: ; Z=1 --> C=1
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LDY #$00
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;; Switch to chunk bellow
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Add_16 >btp_mem_pos, <btp_mem_pos, #$40, #$01; +320
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; C = 1
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; So we subtract #$3F, #$01 +C
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Add_16 >btp_mem_pos, <btp_mem_pos, #$3F, #$01, !; +320
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JMP for_x
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increment_y_pos_end:
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case_2:
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@ -3,7 +3,7 @@
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.include "macros/timer.s"
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.include "STARTUP.s"
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.include "routines/line/line_test.s"
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.include "routines/line/line_test_time.s"
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;jsr char_draw
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;;This is used by .s files to terminate nicely without reading includes at the end!
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exit:
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