git.y1.nz

commit ad3742249666d6cbb87a94b2b9affcc53af799a8
parent 4e1d28757412dcf837ede001cfb25dd50aecffd3
Author: Toxa <untoxa@mail.ru>
Date:   Mon, 16 Mar 2026 16:18:31 +0300

SMS/GG/MSX: improve get_bkg_xy_addr() performance

Diffstat:
M
gbdk-lib/include/msx/msx.h
2
+-
M
gbdk-lib/include/sms/sms.h
2
+-
M
gbdk-lib/libc/targets/z80/coords_to_address.s
17
++++++-----------

3 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/gbdk-lib/include/msx/msx.h b/gbdk-lib/include/msx/msx.h
@@ -834,7 +834,7 @@ uint8_t * set_tile_xy(uint8_t x, uint8_t y, uint8_t t) Z88DK_CALLEE PRESERVES_RE
 /**
  * Get address of X,Y tile of background map
  */
-uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) Z88DK_CALLEE PRESERVES_REGS(iyh, iyl);
+uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) PRESERVES_REGS(iyh, iyl);
 #define get_win_xy_addr get_bkg_xy_addr
 
 #endif /* _MSX_H */
diff --git a/gbdk-lib/include/sms/sms.h b/gbdk-lib/include/sms/sms.h
@@ -920,7 +920,7 @@ inline uint8_t * set_attribute_xy(uint8_t x, uint8_t y, uint8_t a) Z88DK_CALLEE 
 /**
  * Get address of X,Y tile of background map
  */
-uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) Z88DK_CALLEE PRESERVES_REGS(iyh, iyl);
+uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) PRESERVES_REGS(iyh, iyl);
 #define get_win_xy_addr get_bkg_xy_addr
 
 #endif /* _SMS_H */
diff --git a/gbdk-lib/libc/targets/z80/coords_to_address.s b/gbdk-lib/libc/targets/z80/coords_to_address.s
@@ -5,6 +5,12 @@
 
         .area   _HOME
 
+; uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) __preserves_regs(iyh, iyl);
+
+_get_bkg_xy_addr::
+        ld d, l
+        ld e, a
+
 ; translate coords in DE into address in DE
 .coords_to_address::
         ld a, (_shadow_VDP_R2)
@@ -41,13 +47,3 @@
         ld d, b                 ; dest DE = BC + ((0x20 * Y) * 2) + (X * 2)
 
         ret
-
-; uint8_t * get_bkg_xy_addr(uint8_t x, uint8_t y) __z88dk_callee __preserves_regs(iyh, iyl);
-
-_get_bkg_xy_addr::
-        pop hl
-        ex (sp), hl
-        ex de, hl
-        call .coords_to_address
-        ex de, hl
-        ret
-

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