different pointer kinds

[Alessandro Lonardo <alessandro dot lonardo at roma1 dot infn dot it>]

Did anybody face the problem of defining 2 different kinds of pointers 
with gcc?
Suppose you have 2 different memory spaces (A, B) that can be addressed 
using different
register sets (Aptr, Bptr).
Registers belonging to set Aptr have a different size from registers  
belonging to set Bptr.
At syntax level one could implement something like:

int *a_ptr  __attribute__((A));
int *b_ptr  __attribute__((B));

Pmode accepts only one definition and it seems that there is no obvious 
implementation for this,
e.g. :

#define Pmode0   PQI
#define Pmode1   PHI

Thanks in advance,

Alessandro Lonardo