Change the calling conventions only for the intrinsic functions.

[Umesh Kalappa <umesh dot kalappa0 at gmail dot com>]

Hi All ,



We are porting GCC  4.8.1 for the customized hardware, where the
current calling convention used as arguments are passed  by stack and
return value by register.

But we do have some intrinsic functions(that are supplied by hardware
folks ) which has the calling convention like both arguments and
return value are passed by stack.

So question is that currently the backend using  usually  conventions
like arguments are  passed by stack ad return value by register ,But
how do we can model that only intrinsic uses the caller stack space
for return value  over registers.


Appreciate  any hints or shed some lights  on the same.



Thank you

~Umesh