From 1398de818129e6d8eb0a826708e15dfc18383a1c Mon Sep 17 00:00:00 2001
From: Lea <me@janderedev.xyz>
Date: Wed, 25 Jan 2023 19:12:14 +0100
Subject: [PATCH] mfw overflowing_add

---
 src/emulator/instructions/arithmetic.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/emulator/instructions/arithmetic.rs b/src/emulator/instructions/arithmetic.rs
index 6af8f5d..8b06d44 100644
--- a/src/emulator/instructions/arithmetic.rs
+++ b/src/emulator/instructions/arithmetic.rs
@@ -48,8 +48,8 @@ pub fn dad(register: Register, state: &mut EmulatorState) {
         _ => panic!("Cannot perform DAD on register {:?}", register),
     };
 
-    let result = num as u32 + u16::from_le_bytes([state.l, state.h]) as u32;
-    state.cc.c = result > 0xffff;
+    let (result, overflow) = num.overflowing_add(u16::from_le_bytes([state.l, state.h]));
+    state.cc.c = overflow;
     state.h = (result >> 8) as u8;
     state.l = result as u8;
 }