On Tue, Apr 15, 2008 at 10:59 AM, Fran Baena <[EMAIL PROTECTED]> wrote: > Hi all, > > i'm currently studing alias analysis, and i have some questions, for > instance, when are the du/ud-chains calculated?
ud chains are implicit in SSA form, since each use only has one reaching definiiton. du chains are calculated after SSA by the operand scanner. > Before translating to > SSA form? Nope. > If i'm not wrong the def-use chain connects a definition of a variable > to all the uses it may flow to, and the use-def chain connects a use > to all the definitions that may flow to it. But, what chain is better > for data-flow analysis? one is useful for forward dataflow, the other is useful for backwards dataflow. > Maybe the answer is both? Yes. > > Thanks in advance > > Fran >
