32 bit pointers on X86_64 architecture

[Maurizio Vitale <maurizio dot vitale at polymath-solutions dot com>]

Hi all,
	is there a way to have 4 byte (data) pointers without resorting to - 
m32?
I'd like to have 64 bit code, but for a specific library I'm writing  
cache behaviour
would improve if pointers were smaller. Pointers to code would stay  
at 8 bytes.

Any suggestion?
If GCC dowsn't support this mode (and I couldn't find anything in the  
documentation)
I'm thinking about using the linker scripts for forcing all data/heap  
to be in 2Gb
and then add the top 32 bits when dereferencing "pointers", if  
there's a way to get
those 32 bits as a link time constant, rather than storing them in a  
memory location.
This would be done for the few pointers I actually care about.
Thanks in advance,

	Maurizio