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Add a bool to isEdgeFeasible that tells it whether to treat unknown
value as undef or untracked. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51295 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -147,8 +147,12 @@ public:
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LatticeVal getOrInitValueState(Value *V);
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/// isEdgeFeasible - Return true if the control flow edge from the 'From'
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/// basic block to the 'To' basic block is currently feasible...
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bool isEdgeFeasible(BasicBlock *From, BasicBlock *To);
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/// basic block to the 'To' basic block is currently feasible. If
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/// AggressiveUndef is true, then this treats values with unknown lattice
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/// values as undefined. This is generally only useful when solving the
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/// lattice, not when querying it.
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bool isEdgeFeasible(BasicBlock *From, BasicBlock *To,
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bool AggressiveUndef = false);
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private:
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/// UpdateState - When the state for some instruction is potentially updated,
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@ -165,7 +169,8 @@ private:
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/// getFeasibleSuccessors - Return a vector of booleans to indicate which
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/// successors are reachable from a given terminator instruction.
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void getFeasibleSuccessors(TerminatorInst &TI, SmallVectorImpl<bool> &Succs);
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void getFeasibleSuccessors(TerminatorInst &TI, SmallVectorImpl<bool> &Succs,
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bool AggressiveUndef);
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void visitInst(Instruction &I);
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void visitPHINode(PHINode &I);
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@ -115,7 +115,8 @@ void SparseSolver::markEdgeExecutable(BasicBlock *Source, BasicBlock *Dest) {
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/// getFeasibleSuccessors - Return a vector of booleans to indicate which
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/// successors are reachable from a given terminator instruction.
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void SparseSolver::getFeasibleSuccessors(TerminatorInst &TI,
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SmallVectorImpl<bool> &Succs) {
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SmallVectorImpl<bool> &Succs,
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bool AggressiveUndef) {
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Succs.resize(TI.getNumSuccessors());
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if (TI.getNumSuccessors() == 0) return;
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@ -125,7 +126,12 @@ void SparseSolver::getFeasibleSuccessors(TerminatorInst &TI,
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return;
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}
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LatticeVal BCValue = getOrInitValueState(BI->getCondition());
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LatticeVal BCValue;
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if (AggressiveUndef)
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BCValue = getOrInitValueState(BI->getCondition());
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else
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BCValue = getLatticeState(BI->getCondition());
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if (BCValue == LatticeFunc->getOverdefinedVal() ||
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BCValue == LatticeFunc->getUntrackedVal()) {
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// Overdefined condition variables can branch either way.
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@ -157,7 +163,12 @@ void SparseSolver::getFeasibleSuccessors(TerminatorInst &TI,
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}
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SwitchInst &SI = cast<SwitchInst>(TI);
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LatticeVal SCValue = getOrInitValueState(SI.getCondition());
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LatticeVal SCValue;
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if (AggressiveUndef)
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SCValue = getOrInitValueState(SI.getCondition());
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else
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SCValue = getLatticeState(SI.getCondition());
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if (SCValue == LatticeFunc->getOverdefinedVal() ||
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SCValue == LatticeFunc->getUntrackedVal()) {
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// All destinations are executable!
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@ -182,10 +193,11 @@ void SparseSolver::getFeasibleSuccessors(TerminatorInst &TI,
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/// isEdgeFeasible - Return true if the control flow edge from the 'From'
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/// basic block to the 'To' basic block is currently feasible...
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bool SparseSolver::isEdgeFeasible(BasicBlock *From, BasicBlock *To) {
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bool SparseSolver::isEdgeFeasible(BasicBlock *From, BasicBlock *To,
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bool AggressiveUndef) {
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SmallVector<bool, 16> SuccFeasible;
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TerminatorInst *TI = From->getTerminator();
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getFeasibleSuccessors(*TI, SuccFeasible);
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getFeasibleSuccessors(*TI, SuccFeasible, AggressiveUndef);
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for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
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if (TI->getSuccessor(i) == To && SuccFeasible[i])
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@ -196,7 +208,7 @@ bool SparseSolver::isEdgeFeasible(BasicBlock *From, BasicBlock *To) {
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void SparseSolver::visitTerminatorInst(TerminatorInst &TI) {
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SmallVector<bool, 16> SuccFeasible;
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getFeasibleSuccessors(TI, SuccFeasible);
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getFeasibleSuccessors(TI, SuccFeasible, true);
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BasicBlock *BB = TI.getParent();
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@ -226,7 +238,7 @@ void SparseSolver::visitPHINode(PHINode &PN) {
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// transfer function to give us the merge of the incoming values.
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for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
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// If the edge is not yet known to be feasible, it doesn't impact the PHI.
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if (!isEdgeFeasible(PN.getIncomingBlock(i), PN.getParent()))
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if (!isEdgeFeasible(PN.getIncomingBlock(i), PN.getParent(), true))
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continue;
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// Merge in this value.
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