git.y1.nz

commit d5968cce3043da406221dd5a8e75f80b9b02fb12
parent 6def65abde949d1c72c45dd1d7274c078e697e2a
Author: Toxa <untoxa@mail.ru>
Date:   Mon,  8 Jun 2026 15:14:59 +0300

GB/AP: more clear code for the GBA detection (same size and cycles)

Diffstat:
M
gbdk-lib/libc/targets/sm83/ap/crt0.s
10
+++++-----
M
gbdk-lib/libc/targets/sm83/gb/crt0.s
10
+++++-----

2 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/gbdk-lib/libc/targets/sm83/ap/crt0.s b/gbdk-lib/libc/targets/sm83/ap/crt0.s
@@ -222,19 +222,19 @@ _reset::
         CALL    .clear_WRAM
         POP     DE
 
-;       LD      (.mode),A       ; Clearing (.mode) is performed when clearing RAM
-
         ;; Store CPU type
         LD      A, D
         LD      (__cpu), A
         CP      #.CGB_TYPE
         JR      NZ, 1$
-        XOR     A
-        SRL     E
-        RLA
+        LD      A, E
+        AND     #0x01
         LD      (__is_GBA), A
 1$:
         XOR     A
+
+;       LD      (.mode),A       ; Clearing (.mode) is performed when clearing RAM
+
         ;; Initialize the display
         LDH     (.SCY),A
         LDH     (.SCX),A
diff --git a/gbdk-lib/libc/targets/sm83/gb/crt0.s b/gbdk-lib/libc/targets/sm83/gb/crt0.s
@@ -228,19 +228,19 @@ _reset::
         CALL    .clear_WRAM
         POP     DE
 
-;       LD      (.mode),A       ; Clearing (.mode) is performed when clearing RAM
-
         ;; Store CPU type
         LD      A, D
         LD      (__cpu), A
         CP      #.CGB_TYPE
         JR      NZ, 1$
-        XOR     A
-        SRL     E
-        RLA
+        LD      A, E
+        AND     #0x01
         LD      (__is_GBA), A
 1$:
         XOR     A
+
+;       LD      (.mode),A       ; Clearing (.mode) is performed when clearing RAM
+
         ;; Initialize the display
         LDH     (.SCY),A
         LDH     (.SCX),A

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