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Prevent unnecessary CopyToReg when the same HW register appears in two spots

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in the pattern.

llvm-svn: 25437
This commit is contained in:
Evan Cheng 2006-01-19 01:55:45 +00:00
parent ddb170b73e
commit 49fa8f2cea
1 changed files with 9 additions and 0 deletions
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9
utils/TableGen/DAGISelEmitter.cpp
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@ -1835,6 +1835,7 @@ private:
std::map<std::string, Record*> OperatorMap;
// Names of all the folded nodes which produce chains.
std::vector<std::pair<std::string, unsigned> > FoldedChains;
std::set<std::string> Duplicates;
unsigned TmpNo;
public:
@ -1952,6 +1953,7 @@ public:
// previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName << OpNo
<< ") goto P" << PatternNo << "Fail;\n";
Duplicates.insert(RootName + utostr(OpNo));
continue;
}
}
@ -2351,6 +2353,13 @@ private:
EmitCopyToRegs(Child, RootName + utostr(OpNo), ChainEmitted);
} else {
if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
if (!Child->getName().empty()) {
std::string Name = RootName + utostr(OpNo);
if (Duplicates.find(Name) != Duplicates.end())
// A duplicate! Do not emit a copy for this node.
continue;
}
Record *RR = DI->getDef();
if (RR->isSubClassOf("Register")) {
MVT::ValueType RVT = getRegisterValueType(RR, T);