asm declaration
From cppreference.com
                    
                                        
                    
                    
                                                            
                    It can be used to pass information to the back-end of the compiler.
This declaration is conditionally-supported and implementation defined, 
meaning that it may not be present and, even when provided by the implementation, it does not have a fixed meaning
[edit] Syntax
| asm ( string_literal ) | |||||||||