In general, most use cases for assembler are better off using intrinsics - these give access to the advanced instructions of a processor while the compiler stil

In general, most use cases for assembler are better off using intrinsics - these give access to the advanced instructions of a processor while the compiler still does the register allocation and scheduling, and ABI compatibility. Only in a few cases, like if you really expect to invest a lot of time to scrape out the last few processor cycles, or you're doing something that can't be done with intrinsics (like an interrupt vector) does it make sense to drop into plain assembler.