From d33de14694da804d97d5531335934bafda6aac3b Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Sat, 15 Oct 2022 11:13:54 +0200
Subject: [PATCH] Emulator: Fix swap opcodes

---
 src/cpu-prefix.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/cpu-prefix.cpp b/src/cpu-prefix.cpp
index 97009f2..164e84d 100644
--- a/src/cpu-prefix.cpp
+++ b/src/cpu-prefix.cpp
@@ -365,8 +365,7 @@ void CPU::swap()
 		m_wait_cycles += 8;
 
 		// Swap upper 4 bits in register r8 with lower 4 bits
-		register_ = register_ & 0xff;
-		register_ = (register_ >> 4) | (register_ << 4);
+		register_ = ((register_ >> 4) | (register_ << 4)) & 0xff;
 
 		// Set flags
 		m_zf = (register_ == 0);