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Remove dead nodes more efficiently

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5462 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-02-01 06:23:33 +00:00
parent a1220afc3a
commit 5e7d0e2691
1 changed files with 2 additions and 1 deletions
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3
lib/Analysis/DataStructure/DataStructure.cpp
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@ -1095,7 +1095,8 @@ void DSGraph::removeDeadNodes(unsigned Flags) {
for (unsigned i = 0; i != Nodes.size(); ++i)
if (!Alive.count(Nodes[i])) {
DSNode *N = Nodes[i];
Nodes.erase(Nodes.begin()+i--); // Erase node from alive list.
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
}