Generating assembler code

Sometimes when you are working on a device driver or some kernel functions - or just if you need to speed-up one small function in your program you might want to create the function in assembler code. Writing assembler is hard but you can let the C compiler do the hard stuff for you and then just optimize the result. Sometimes you might hit an optimizer bug which forces you to look at the generated code to see where the problem is - even compilers have bugs.

gcc -S myCfile.c 

produces assembler output.