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Ignore redundant constraints
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42397 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -134,6 +134,21 @@ namespace {
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assert(Offset == 0 || Ty != AddressOf &&
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"Offset is illegal on addressof constraints");
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}
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bool operator==(const Constraint &RHS) const {
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return RHS.Type == Type
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&& RHS.Dest == Dest
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&& RHS.Src == Src
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&& RHS.Offset == Offset;
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}
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bool operator<(const Constraint &RHS) const {
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if (RHS.Type != Type)
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return RHS.Type < Type;
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else if (RHS.Dest != Dest)
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return RHS.Dest < Dest;
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else if (RHS.Src != Src)
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return RHS.Src < Src;
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return RHS.Offset < Offset;
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}
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};
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// Node class - This class is used to represent a node in the constraint
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@ -1735,6 +1750,7 @@ void Andersens::HUValNum(unsigned NodeIndex) {
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/// replaced by their the pointer equivalence class representative.
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void Andersens::RewriteConstraints() {
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std::vector<Constraint> NewConstraints;
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std::set<Constraint> Seen;
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PEClass2Node.clear();
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PENLEClass2Node.clear();
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@ -1771,9 +1787,11 @@ void Andersens::RewriteConstraints() {
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C.Src = FindEquivalentNode(RHSNode, RHSLabel);
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C.Dest = FindEquivalentNode(FindNode(LHSNode), LHSLabel);
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if (C.Src == C.Dest && C.Type == Constraint::Copy)
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if (C.Src == C.Dest && C.Type == Constraint::Copy
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|| Seen.count(C) != 0)
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continue;
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Seen.insert(C);
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NewConstraints.push_back(C);
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}
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Constraints.swap(NewConstraints);
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