* Segher Boessenkool: > Hi! > > On Mon, Oct 14, 2019 at 11:26:15AM +0200, Florian Weimer wrote: >> In some cases, it is desirable as an optimization not to save any >> callee-saved registers in the function prologue. This is common for >> functions which are at the lowest frame, where there is nothing to >> return to, and unwinding cannot proceed, either. However, GCC seems to >> generate code for saving registers even for such functions, for example: > >> Is there a way to avoid this? > > I don't think so. > > What will this do to debuggability? Not much I hope... There are many > comparable cases where we lose variable contents of callers. The values saved belong to the caller's frame. If we know that such a frame does not exist, there can't be a debugging regression because the values are meaningless. > Could you open a feature request please? I filed: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92086> Thanks, Florian
