From 96d9bc444090e76b0722b86c5644add2fe4cb808 Mon Sep 17 00:00:00 2001
From: hugova <hugova@kth.se>
Date: Sat, 29 Mar 2025 21:50:25 +0100
Subject: [PATCH] Improve performance of line_down from 837970 to 835768 (cpu
 cyceles of a test)

---
 wip-hugo/routines/line/line_down.s | 8 ++++++--
 wip-hugo/source.s                  | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/wip-hugo/routines/line/line_down.s b/wip-hugo/routines/line/line_down.s
index 6774b7e..cf61f5f 100644
--- a/wip-hugo/routines/line/line_down.s
+++ b/wip-hugo/routines/line/line_down.s
@@ -77,7 +77,9 @@ increment_pixel_x:
         BCC increment_pixel_x_end; We need to move to the next chunk
 move_8px_left:
         ;; 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
         LDA #%10000000
         STA byte_to_paint
@@ -101,7 +103,9 @@ increment_y_pos:
 move_8px_down: ; Z=1 --> C=1
         LDY #$00
         ;; 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
 increment_y_pos_end:
 case_2:
diff --git a/wip-hugo/source.s b/wip-hugo/source.s
index b7cd4f6..79b7b72 100755
--- a/wip-hugo/source.s
+++ b/wip-hugo/source.s
@@ -3,7 +3,7 @@
 .include "macros/timer.s"
 
 .include "STARTUP.s"
-.include "routines/line/line_test.s"
+.include "routines/line/line_test_time.s"
 ;jsr char_draw
 ;;This is used by .s files to terminate nicely without reading includes at the end!
 exit: