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Put all IVUsers in the processed set. Allow querying IVUsers with isIVUserOrOperand.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147686 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -166,6 +166,10 @@ public:
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const_iterator end() const { return IVUses.end(); }
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bool empty() const { return IVUses.empty(); }
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bool isIVUserOrOperand(Instruction *Inst) const {
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return Processed.count(Inst);
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}
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void print(raw_ostream &OS, const Module* = 0) const;
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/// dump - This method is used for debugging.
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@ -83,6 +83,11 @@ static bool isInteresting(const SCEV *S, const Instruction *I, const Loop *L,
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/// reducible SCEV, recursively add its users to the IVUsesByStride set and
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/// return true. Otherwise, return false.
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bool IVUsers::AddUsersIfInteresting(Instruction *I) {
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// Add this IV user to the Processed set before returning false to ensure that
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// all IV users are members of the set. See IVUsers::isIVUserOrOperand.
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if (!Processed.insert(I))
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return true; // Instruction already handled.
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if (!SE->isSCEVable(I->getType()))
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return false; // Void and FP expressions cannot be reduced.
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@ -93,9 +98,6 @@ bool IVUsers::AddUsersIfInteresting(Instruction *I) {
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if (Width > 64 || (TD && !TD->isLegalInteger(Width)))
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return false;
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if (!Processed.insert(I))
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return true; // Instruction already handled.
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// Get the symbolic expression for this instruction.
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const SCEV *ISE = SE->getSCEV(I);
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@ -268,6 +270,7 @@ void IVStrideUse::transformToPostInc(const Loop *L) {
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void IVStrideUse::deleted() {
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// Remove this user from the list.
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Parent->Processed.erase(this->getUser());
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Parent->IVUses.erase(this);
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// this now dangles!
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}
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