new liveness pass

Stephen Weeks
Mon, 4 Dec 2000 09:56:02 -0800 (PST)

> The liveness pass looks really impressive.  I don't quite follow your 
> description though -- when you say that a variable is at the head of
> the liveness list or not there at all, you're certainly not implying that
> the list is a singleton, are you? 

No.  Since we are working on one variable at a time, and a variable is always
added to the front of the list, we can check for it only there.