Simplified code

src/build/core/CompileCall.go

@@ -11,8 +11,8 @@ import (
 // Registers that are in use must be saved if they are modified by the function.
 // After the function call, they must be restored in reverse order.
 func (f *Function) CompileCall(root *expression.Expression) error {
-	funcNameRoot := root.Children[0]
 	funcName := ""
+	funcNameRoot := root.Children[0]
 
 	if funcNameRoot.IsLeaf() {
 		funcName = funcNameRoot.Token.Text(f.File.Bytes)
@@ -47,7 +47,7 @@ func (f *Function) CompileCall(root *expression.Expression) error {
 
 	// Push
 	for _, register := range f.CPU.General {
-		if f.CurrentScope().IsUsed(register) {
+		if f.RegisterIsUsed(register) {
 			f.Register(asm.PUSH, register)
 		}
 	}
@@ -59,19 +59,20 @@ func (f *Function) CompileCall(root *expression.Expression) error {
 		f.Call(funcName)
 	}
 
+	// Free parameter registers
 	for _, register := range registers {
 		if register == f.CPU.Output[0] && root.Parent != nil {
 			continue
 		}
 
-		f.CurrentScope().Free(register)
+		f.FreeRegister(register)
 	}
 
 	// Pop
 	for i := len(f.CPU.General) - 1; i >= 0; i-- {
 		register := f.CPU.General[i]
 
-		if f.CurrentScope().IsUsed(register) {
+		if f.RegisterIsUsed(register) {
 			f.Register(asm.POP, register)
 		}
 	}