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 {