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Fix the dominates method to return true if the two nodes are the same. Add

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a new properlyDominates method to do what the old one did.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24407 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-11-18 07:27:33 +00:00
parent f124d5e500
commit a35bef9db2
1 changed files with 13 additions and 5 deletions
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18
include/llvm/Analysis/Dominators.h
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@ -306,16 +306,24 @@ public:
inline Node *getIDom() const { return IDom; }
inline const std::vector<Node*> &getChildren() const { return Children; }
/// properlyDominates - Returns true iff this dominates N and this != N.
/// Note that this is not a constant time operation!
///
bool properlyDominates(const Node *N) const {
const Node *IDom;
while ((IDom = N->getIDom()) != 0 && IDom != this)
N = IDom; // Walk up the tree
return IDom != 0;
}
/// dominates - Returns true iff this dominates N. Note that this is not a
/// constant time operation!
///
inline bool dominates(const Node *N) const {
const Node *IDom;
while ((IDom = N->getIDom()) != 0 && IDom != this)
N = IDom; // Walk up the tree
return IDom != 0;
if (N == this) return true; // A node trivially dominates itself.
return properlyDominates(N);
}
private:
inline Node(BasicBlock *BB, Node *iDom) : TheBB(BB), IDom(iDom) {}
inline Node *addChild(Node *C) { Children.push_back(C); return C; }