git.y1.nz

commit c3f5af60f1725310af49db449f2752ca6ceb42aa
parent a19eebc8d858454f6863ceefc52c5a7124deb1a1
Author: Toxa <untoxa@mail.ru>
Date:   Wed, 25 Aug 2021 15:27:07 +0300

SMS/GG: save a few bytes and cycles in .set_tile_map_xy_tt/.set_tile_map_xy_tt_compat

Diffstat:
M
gbdk-lib/libc/targets/z80/set_tile_map_xy.s
8
++------
M
gbdk-lib/libc/targets/z80/set_tile_map_xy_compat.s
8
++------

2 files changed, 4 insertions(+), 12 deletions(-)
diff --git a/gbdk-lib/libc/targets/z80/set_tile_map_xy.s b/gbdk-lib/libc/targets/z80/set_tile_map_xy.s
@@ -17,12 +17,8 @@
         push bc                 ; Store source
 
         ld a, d
-        rlca 
-        rlca 
-        rlca 
-        rlca 
-        rlca 
-        rlca 
+        rrca                    ; rrca(2) == rlca(6)
+        rrca
         ld d, a
         and #0x07
         add h
diff --git a/gbdk-lib/libc/targets/z80/set_tile_map_xy_compat.s b/gbdk-lib/libc/targets/z80/set_tile_map_xy_compat.s
@@ -19,12 +19,8 @@
         push bc                 ; Store source
 
         ld a, d
-        rlca 
-        rlca 
-        rlca 
-        rlca 
-        rlca 
-        rlca 
+        rrca                    ; rrca(2) == rlca(6)
+        rrca 
         ld d, a
         and #0x07
         add h

This webpage is intended to be an accessible preview of this repository. To get a fuller picture, clone it and use the git CLI.