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The PhiNodes 2D vector is only used during PHI node placement. It doesn't
need to be an instance variable! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8860 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -62,10 +62,6 @@ namespace {
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// VersionNumbers - Current version counters for each alloca
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std::vector<unsigned> VersionNumbers;
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// PhiNodes - Each alloca contains a list of basic blocks which contain PHI
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// nodes for the alloca.
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std::vector<std::vector<BasicBlock*> > PhiNodes;
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// NewPhiNodes - The PhiNodes we're adding.
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std::map<BasicBlock*, std::vector<PHINode*> > NewPhiNodes;
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@ -90,7 +86,6 @@ void PromoteMem2Reg::run() {
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Function &F = *DF.getRoot()->getParent();
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VersionNumbers.resize(Allocas.size());
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PhiNodes.resize(Allocas.size());
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for (unsigned i = 0; i != Allocas.size(); ++i) {
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AllocaInst *AI = Allocas[i];
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@ -110,6 +105,10 @@ void PromoteMem2Reg::run() {
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AllocaLookup[Allocas[i]] = i;
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// PhiNodeBlocks - A list of blocks that phi nodes have been inserted for
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// this alloca.
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std::vector<BasicBlock*> PhiNodeBlocks;
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// Compute the locations where PhiNodes need to be inserted. Look at the
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// dominance frontier of EACH basic-block we have a write in.
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//
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@ -120,19 +119,20 @@ void PromoteMem2Reg::run() {
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const DominanceFrontier::DomSetType &S = it->second;
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for (DominanceFrontier::DomSetType::iterator P = S.begin(),PE = S.end();
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P != PE; ++P)
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QueuePhiNode(*P, i);
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if (QueuePhiNode(*P, i))
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PhiNodeBlocks.push_back(*P);
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}
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}
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// Perform iterative step
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std::vector<BasicBlock*> &AllocaPhiNodes = PhiNodes[i];
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for (unsigned k = 0; k != AllocaPhiNodes.size(); k++) {
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DominanceFrontier::const_iterator it = DF.find(AllocaPhiNodes[k]);
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for (unsigned k = 0; k != PhiNodeBlocks.size(); k++) {
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DominanceFrontier::const_iterator it = DF.find(PhiNodeBlocks[k]);
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if (it != DF.end()) {
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const DominanceFrontier::DomSetType &S = it->second;
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for (DominanceFrontier::DomSetType::iterator
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P = S.begin(), PE = S.end(); P != PE; ++P)
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QueuePhiNode(*P, i);
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if (QueuePhiNode(*P, i))
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PhiNodeBlocks.push_back(*P);
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}
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}
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}
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@ -198,7 +198,6 @@ bool PromoteMem2Reg::QueuePhiNode(BasicBlock *BB, unsigned AllocaNo) {
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PN->addIncoming(NullVal, Preds[i]);
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BBPNs[AllocaNo] = PN;
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PhiNodes[AllocaNo].push_back(BB);
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return true;
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}
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