This is not a right reason to code asm.<p>One of the main right reasons is to increase the independence from the lock-in of compilers, usually via absurd size and complexity, and the never-ending planned obsolescence of the language syntaxes (ISO or compiler specific extensions) they implement (the worst are c++ and similar due to their beyond sanity syntax complexity).<p>Of course, coding asm with an ultra-complex macro preprocessor is pointless. The assembler and macro preprocessor should be programs order of magnitude simpler than compilers (to keep the door open for alternatives).