git.y1.nz

commit 34945fa9b49848cb815b92ee796e4b6ab88a4ba4
parent 08ccffbf7ff31be4df264b4d682e1e17429dfacc
Author: Phidias618 <126189685+Phidias618@users.noreply.github.com>
Date:   Sun, 17 May 2026 15:43:05 +0200

refactor memcpy() for the z80 target
Diffstat:
M
gbdk-lib/libc/asm/z80/memcpy.s
18
++++++++++--------

1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/gbdk-lib/libc/asm/z80/memcpy.s b/gbdk-lib/libc/asm/z80/memcpy.s
@@ -7,24 +7,26 @@
 
 ; The Z80 has the ldir instruction, but the chain of ldi is faster.
 _memcpy:
-___memcpy:
+___memcpy:    
     ex de, hl
     pop af
     pop bc
     push af
-    ld a, b
-    or c
+
+    ld a, c
+    or b
     ret z
+    
     push de
+
     ld a, c
-    and #15
     add a
-    sub #32
     neg
-    ld iy, #1$
-    add iyl
+    and #31
+    
+    add #<1$
     ld iyl, a
-    adc iyh
+    adc #>1$
     sub iyl
     ld iyh, a
     xor a

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