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Optimize po_iterator: don't do redundant lookups.

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llvm-svn: 125211
This commit is contained in:
Dan Gohman 2011-02-09 19:25:31 +00:00
parent bd07266baa
commit a5cb7ac412
1 changed files with 2 additions and 4 deletions
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6
include/llvm/ADT/PostOrderIterator.h
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@ -56,8 +56,7 @@ class po_iterator : public std::iterator<std::forward_iterator_tag,
void traverseChild() { void traverseChild() {
while (VisitStack.back().second != GT::child_end(VisitStack.back().first)) { while (VisitStack.back().second != GT::child_end(VisitStack.back().first)) {
NodeType *BB = *VisitStack.back().second++; NodeType *BB = *VisitStack.back().second++;
if (!this->Visited.count(BB)) { // If the block is not visited... if (this->Visited.insert(BB)) { // If the block is not visited...
this->Visited.insert(BB);
VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB))); VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB)));
} }
} }
@ -72,8 +71,7 @@ class po_iterator : public std::iterator<std::forward_iterator_tag,
inline po_iterator(NodeType *BB, SetType &S) : inline po_iterator(NodeType *BB, SetType &S) :
po_iterator_storage<SetType, ExtStorage>(S) { po_iterator_storage<SetType, ExtStorage>(S) {
if(!S.count(BB)) { if (this->Visited.insert(BB)) {
this->Visited.insert(BB);
VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB))); VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB)));
traverseChild(); traverseChild();
} }