RTL alias annotation

[Iman Narasamdya]

Hello,

I'd like to know the meaning of alias annotations occuring in RTL. For 
example, in
	(mem/f:SI
		(plus:SI (reg/f:SI 6 ebp)
		(const_int -4 [0xfffffffc])) [0 name+0 S4 A32])
what do 0, S4, and A32 in [0 name+0 S4 A32] mean?

Another question is does gcc perform inter-procedural alias-analysis? If 
it does, does it emit some information of it in the RTL?

Rgds,

Iman Narasamdya