On 2/28/08 8:59 AM, Jan Hubicka wrote:
Yes, I do believe that wast majority of DU/UD code can stay as it is. We just need to introduce the PHI nodes, either in a way Gimple does that in separate section of CFG or as real RTL noop moves (or we can even have RTL PHI code that would behave same way as USEs does not, ie bypass machine validation issues).
Introducing them as objects in the DF datastructures may be more convenient. You just make them a separate list of PHI nodes in each BB as we have in GIMPLE.
Diego.
