Hi, Dear Boissinot:
1. When I have irreducible CFG, I travel its nodes by DFS.
search backedge for every node. After I finish one node,
push it into a stack.
[0, 1, 2, M] <---push.
[0, 1, 2, M,...N] <---push.
When resolving node M, find a edge from node N to node M,
N is not in stack(M < N), It is a backedge.
N is in stack(M > N), It is NOT a backedge.
I treat these backedges as loop-edges. M is Loop header node.
If I cut these edges from CFG, CFG can be topological sort.
Am I right???
--- 10年1月26日，周二, Benoit Boissinot <bboissin+llvm@gmail.com> 写道：