http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60073
--- Comment #7 from Alan Modra <amodra at gmail dot com> --- The variadic support in libfii is fairly recent. And yes, it might have been there earlier if the testcases actually tested what they were suppose to test! Note that powerpc64-gcc passes fp arguments corresponding to the ellipsis part of variadic functions in both the parameter save area and fp registers, contrary to the ABI which says they just go in the parameter save area if the function has a prototype. I think this was in part to satisfy libffi, where without variadic support you don't know whether a function call is normal or variadic and thus the powerpc libffi support had to pull fp values from fp registers. So we broke gcc (a little) to satisfy libffi..
