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Improve performance of line_down from 837970 to 835768 (cpu cyceles of a test)

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hugova 2025-03-29 21:50:25 +01:00
parent 963cc1b258
commit 96d9bc4440
2 changed files with 7 additions and 3 deletions
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8
wip-hugo/routines/line/line_down.s
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@ -77,7 +77,9 @@ increment_pixel_x:
BCC increment_pixel_x_end; We need to move to the next chunk BCC increment_pixel_x_end; We need to move to the next chunk
move_8px_left: move_8px_left:
;; Next chunk is 8 addresses away. Look in pixel_draw for more detail. ;; Next chunk is 8 addresses away. Look in pixel_draw for more detail.
Add_16 >btp_mem_pos, <btp_mem_pos, #$08, #$00 ;; -8.
;; C = 1 therefore you se 07
Add_16 >btp_mem_pos, <btp_mem_pos, #$07, #$00, !
;; Restores byte to paint ;; Restores byte to paint
LDA #%10000000 LDA #%10000000
STA byte_to_paint STA byte_to_paint
@ -101,7 +103,9 @@ increment_y_pos:
move_8px_down: ; Z=1 --> C=1 move_8px_down: ; Z=1 --> C=1
LDY #$00 LDY #$00
;; Switch to chunk bellow ;; Switch to chunk bellow
Add_16 >btp_mem_pos, <btp_mem_pos, #$40, #$01; +320 ; C = 1
; So we subtract #$3F, #$01 +C
Add_16 >btp_mem_pos, <btp_mem_pos, #$3F, #$01, !; +320
JMP for_x JMP for_x
increment_y_pos_end: increment_y_pos_end:
case_2: case_2:

2
wip-hugo/source.s
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@ -3,7 +3,7 @@
.include "macros/timer.s" .include "macros/timer.s"
.include "STARTUP.s" .include "STARTUP.s"
.include "routines/line/line_test.s" .include "routines/line/line_test_time.s"
;jsr char_draw ;jsr char_draw
;;This is used by .s files to terminate nicely without reading includes at the end! ;;This is used by .s files to terminate nicely without reading includes at the end!
exit: exit: