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SCEVTraversal: Add a visited set.
Expression trees may be DAGs. Make sure traversal has linear complexity. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160426 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,6 +15,7 @@
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#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPRESSIONS_H
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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@ -505,9 +506,10 @@ namespace llvm {
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class SCEVTraversal {
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SV &Visitor;
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SmallVector<const SCEV *, 8> Worklist;
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SmallPtrSet<const SCEV *, 8> Visited;
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void push(const SCEV *S) {
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if (Visitor.follow(S))
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if (Visited.insert(S) && Visitor.follow(S))
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Worklist.push_back(S);
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}
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public:
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