conditional registers per function, possible or not?

[Dylan_S_Cuthbert@hq.scei.sony.co.jp]

I didn't get a response to my last question along these lines:

Is it at all possible within the current gcc frame work to be able to use
conditional registers selected on a per function basis?

Something like this perhaps:

int SpecialFunction( ) __attribute__ ((registers_begin( $8))) __attribute__
((registers_end( $20)));

Ideas?

Dylan Cuthbert