Fixed breaking bug with Register.set

.gitignore

@@ -1,2 +1,3 @@
 
-.dir-locals.el
+.dir-locals.el
+__pycache__

register.py

@@ -22,7 +22,9 @@ class Register:
         if value < 0:
             self.value = self.truncate_val(abs(value), self.n_bits - 1)
             self.negate()
-        self.truncate()
+        else:
+            self.value = value
+            self.truncate()
 
     def get(self):
         return self.value