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Prevent unnecessary CopyToReg when the same HW register appears in two spots
in the pattern. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25437 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1835,6 +1835,7 @@ private:
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std::map<std::string, Record*> OperatorMap;
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// Names of all the folded nodes which produce chains.
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std::vector<std::pair<std::string, unsigned> > FoldedChains;
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std::set<std::string> Duplicates;
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unsigned TmpNo;
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public:
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@ -1952,6 +1953,7 @@ public:
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// previously named thing.
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OS << " if (" << VarMapEntry << " != " << RootName << OpNo
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<< ") goto P" << PatternNo << "Fail;\n";
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Duplicates.insert(RootName + utostr(OpNo));
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continue;
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}
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}
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@ -2351,6 +2353,13 @@ private:
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EmitCopyToRegs(Child, RootName + utostr(OpNo), ChainEmitted);
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} else {
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if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
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if (!Child->getName().empty()) {
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std::string Name = RootName + utostr(OpNo);
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if (Duplicates.find(Name) != Duplicates.end())
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// A duplicate! Do not emit a copy for this node.
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continue;
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}
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Record *RR = DI->getDef();
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if (RR->isSubClassOf("Register")) {
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MVT::ValueType RVT = getRegisterValueType(RR, T);
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