Simplify variables

example/src/main.nub

@@ -4,6 +4,7 @@ extern func puts(text: cstring)
 interface Printable
 {
     func print()
+    func test()
 }
 
 struct Human : Printable
@@ -15,6 +16,11 @@ struct Human : Printable
     {
         puts(this.name)
     }
+
+    func test()
+    {
+        puts("test")
+    }
 }
 
 func main(args: []cstring): i64
@@ -25,6 +31,7 @@ func main(args: []cstring): i64
     }
 
     x.print()
+    x.test()
 
     return 0
 }

src/compiler/NubLang/Generation/QBE/QBEGenerator.cs

@@ -559,12 +559,11 @@ public class QBEGenerator
     private void EmitVariableDeclaration(VariableDeclarationNode variableDeclaration)
     {
         var name = $"%{variableDeclaration.Name}";
-        _writer.Indented($"{name} =l alloc8 8");
+        _writer.Indented($"{name} =l alloc8 {SizeOf(variableDeclaration.Type)}");
 
         if (variableDeclaration.Assignment.HasValue)
         {
-            var value = EmitCreateCopyOrInitialize(variableDeclaration.Assignment.Value);
-            EmitStore(variableDeclaration.Assignment.Value.Type, value, name);
+            EmitCopyIntoOrInitialize(variableDeclaration.Assignment.Value, name);
         }
     }
 
@@ -697,11 +696,11 @@ public class QBEGenerator
 
         var elementType = ((ArrayTypeNode)arrayIndexAccess.Target.Type).ElementType;
 
-        var address = TmpName();
-        _writer.Indented($"{address} =l mul {index}, {SizeOf(elementType)}");
-        _writer.Indented($"{address} =l add {address}, 8");
-        _writer.Indented($"{address} =l add {array}, {address}");
-        return address;
+        var offset = TmpName();
+        _writer.Indented($"{offset} =l mul {index}, {SizeOf(elementType)}");
+        _writer.Indented($"{offset} =l add {offset}, 8");
+        _writer.Indented($"{offset} =l add {array}, {offset}");
+        return offset;
     }
 
     private string EmitAddressOfStructFieldAccess(StructFieldAccessNode structFieldAccess)
@@ -840,7 +839,11 @@ public class QBEGenerator
 
     private string EmitVariableIdent(VariableIdentNode variableIdent)
     {
-        return EmitLoad(variableIdent.Type, EmitAddressOfVariableIdent(variableIdent));
+        var address = EmitAddressOfVariableIdent(variableIdent);
+
+        return variableIdent.Type.IsSimpleType(out _, out _)
+            ? EmitLoad(variableIdent.Type, address)
+            : address;
     }
 
     private string EmitFuncParameterIdent(FuncParameterIdentNode funcParameterIdent)
@@ -1058,10 +1061,11 @@ public class QBEGenerator
         var func = TmpName();
         _writer.Indented($"{func} =l loadl {funcOffset}");
 
-        _writer.Indented($"{target} =l add {target}, 8");
-        _writer.Indented($"{target} =l loadl {target}");
+        var data = TmpName();
+        _writer.Indented($"{data} =l add {target}, 8");
+        _writer.Indented($"{data} =l loadl {data}");
 
-        List<string> parameterStrings = [$"l {target}"];
+        List<string> parameterStrings = [$"l {data}"];
 
         foreach (var parameter in interfaceFuncCall.Parameters)
         {