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Delete nodes more efficiently

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-02-01 06:41:15 +00:00
parent 5e7d0e2691
commit d4400c8297
1 changed files with 4 additions and 6 deletions
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10
lib/Analysis/DataStructure/DataStructure.cpp
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@ -1090,19 +1090,17 @@ void DSGraph::removeDeadNodes(unsigned Flags) {
ScalarMap.erase(GlobalNodes[i].first);
// Loop over all unreachable nodes, dropping their references...
std::vector<DSNode*> DeadNodes;
DeadNodes.reserve(Nodes.size()); // Only one allocation is allowed.
for (unsigned i = 0; i != Nodes.size(); ++i)
if (!Alive.count(Nodes[i])) {
DSNode *N = Nodes[i];
std::swap(Nodes[i--], Nodes.back()); // move node to end of vector
Nodes.pop_back(); // Erase node from alive list.
DeadNodes.push_back(N); // Add node to our list of dead nodes
N->dropAllReferences(); // Drop all outgoing edges
while (!N->getReferrers().empty())
N->getReferrers().back()->setNode(0);
delete N;
}
// Delete all dead nodes...
std::for_each(DeadNodes.begin(), DeadNodes.end(), deleter<DSNode>);
}
#if 0