On Sun, Oct 16, 2011 at 06:31, Richard Guenther <richard.guent...@gmail.com> wrote: > The question is now, of course why you need to emit calls > from an asm() statement, something which isn't guaranteed > to work anyway (IIRC).
It's not guaranteed to work in general. The problem to solve is that I know the function which is called is not clobbering any registers. If I leave it with the normal function call gcc has to spill registers. If I can hide the function call the generated code can be significantly better. An alternative solution would be to have a function attribute which allows me to specify which registers are clobbered. Or at least an attribute which says none are clobbered.
