From d6a8e5c6de916bc8d26d7e5d4b9ab228dd097215 Mon Sep 17 00:00:00 2001
From: Binyamin Y Cohen <42520501+binyamin555@users.noreply.github.com>
Date: Mon, 13 Jan 2025 17:16:00 +0200
Subject: [PATCH] Update main.cpp

Update `SWP` and `SWPC` instructions so that they don't override the 3rd register.
---
 Astro8-Emulator/main.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Astro8-Emulator/main.cpp b/Astro8-Emulator/main.cpp
index 1b3df84..4bee71a 100644
--- a/Astro8-Emulator/main.cpp
+++ b/Astro8-Emulator/main.cpp
@@ -1705,14 +1705,14 @@ void Update()
 				cout << "ldw  change AReg to " << AReg << endl;
 			break;
 		case SWP:
-			CReg = AReg;
-			AReg = BReg;
-			BReg = CReg;
+			AReg = AReg ^ BReg;
+			BReg = AReg ^ BReg;
+			AReg = AReg ^ BReg;
 			break;
 		case SWPC:
-			BReg = CReg;
-			CReg = AReg;
-			AReg = BReg;
+			AReg = AReg ^ CReg;
+			CReg = AReg ^ CReg;
+			AReg = AReg ^ CReg;
 			break;
 		case PCR:
 			AReg = programCounter - 1;