git.y1.nz

commit e3b2f469d4211cad07d4458cbda6d3aea49fa299
parent 7a62ba7196a6ea5ed4fc9bb950030f7b96164764
Author: Toxa <56631470+untoxa@users.noreply.github.com>
Date:   Mon,  2 Mar 2026 14:54:54 +0300

Merge pull request #865 from Phidias618/patch-1

Fix divisions by one
Diffstat:
M
gbdk-lib/libc/asm/sm83/div.s
17
++++++++++++++++-

1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/gbdk-lib/libc/asm/sm83/div.s b/gbdk-lib/libc/asm/sm83/div.s
@@ -69,7 +69,12 @@ __divuint::
 		
 		or l
         jr z, .division_by_zero
-        
+
+		ld a, l
+		and h
+		inc a
+		jr z, .division_by_one
+		
         ; if X < Y then
         ;	return quotient = 0 and remainder = X
         ; else
@@ -164,6 +169,16 @@ ret_hl_in_de:
         ; if this is reached, then bc = 0
         scf
 		jr ret_hl_in_de
+.division_by_one:
+		; returns a remainder of 0 and a quotient of X
+		ld c, e
+		ld b, d
+		
+		; a is assumed to store 0
+		ld d, a
+		ld e, a
+		
+		ret
 
 
 ; mixed sign division

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