Induction Variable

[Rajkishore Barik]

Hi,
Can someone tell me how to obtain the following:

1) Given a rtx, find out if it is an induction variable.
2) For an induction variable, find all the loop nest
3) For each loopnest, find the corresponding upper and lower bounds 
(compile-time)
4) For an induction variables, find the increment/decrement value

I tried using the "iv_analysis_init(loop)", "iv_analyze()" and 
"iv_iv_analysis_done()". However,
since I am calling these functions later in the stage (just before 
register allocation), they give me
ICE. Any clue?

Aliasing:
5) Given two mem-rtx "a" and "b" find if they alias to each other. Assume 
that "a" and "b" 
represent programmer defined arrays which are never assigned directly. I 
looked at the code
of alias.c, but the interfaces are not clear to me as to how they should 
be used to get what I want.

regards,
Raj