Implemented a basic optimization

src/build/core/CompileCall.go

@@ -29,12 +29,6 @@ func (f *Function) CompileCall(root *expression.Expression) error {
 		registers = f.cpu.Syscall[:len(parameters)]
 	}
 
-	for _, register := range f.cpu.Input {
-		if f.cpu.IsUsed(register) {
-			f.SaveRegister(register)
-		}
-	}
-
 	err := f.ExpressionsToRegisters(parameters, registers)
 
 	if err != nil {

src/build/core/ExecuteRegisterRegister.go

@@ -26,9 +26,7 @@ func (f *Function) ExecuteRegisterRegister(operation token.Token, destination cp
 		f.assembler.RegisterRegister(asm.COMPARE, destination, source)
 
 	case "=":
-		if destination != source {
-			f.assembler.RegisterRegister(asm.MOVE, destination, source)
-		}
+		f.assembler.RegisterRegister(asm.MOVE, destination, source)
 
 	default:
 		return errors.New(&errors.InvalidOperator{Operator: operation.Text()}, f.File, operation.Position)

src/build/core/Function.go

@@ -47,6 +47,13 @@ func NewFunction(name string, file *fs.File, body token.List) *Function {
 func (f *Function) Compile() {
 	defer close(f.finished)
 	f.assembler.Label(asm.LABEL, f.Name)
+
+	for _, register := range f.cpu.Input {
+		if f.cpu.IsUsed(register) {
+			f.SaveRegister(register)
+		}
+	}
+
 	f.err = f.CompileTokens(f.Body)
 	f.assembler.Return()
 }

src/build/core/TokenToRegister.go

@@ -21,10 +21,7 @@ func (f *Function) TokenToRegister(t token.Token, register cpu.Register) error {
 			return errors.New(&errors.UnknownIdentifier{Name: name}, f.File, t.Position)
 		}
 
-		if register != variable.Register {
-			f.assembler.RegisterRegister(asm.MOVE, register, variable.Register)
-		}
-
+		f.assembler.RegisterRegister(asm.MOVE, register, variable.Register)
 		f.useVariable(variable)
 		return nil