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At the end of isel, select a replacement node for each handle that does not

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have one. This can happen if a load's real uses are dead (i.e. they do not
have uses themselves).

llvm-svn: 26014
This commit is contained in:
Evan Cheng 2006-02-06 08:12:55 +00:00
parent 6f1778d4e1
commit 2af9230f1e
1 changed files with 24 additions and 11 deletions
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35
utils/TableGen/DAGISelEmitter.cpp
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@ -2856,7 +2856,7 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
<< "CurDAG->getNode(ISD::HANDLENODE, MVT::Other, N);\n"
<< " CodeGenMap[N.getValue(" << OpcodeInfo.getNumResults()
<< ")] = Dummy;\n"
<< " HolderMap[N.getValue(" << OpcodeInfo.getNumResults()
<< " HandleMap[N.getValue(" << OpcodeInfo.getNumResults()
<< ")] = Dummy;\n"
<< " return Dummy;\n"
<< " }\n";
@ -3061,9 +3061,9 @@ void DAGISelEmitter::run(std::ostream &OS) {
<< "std::map<SDOperand, SDOperand> CodeGenMap;\n";
OS << "// Instance var to keep track of mapping of chain generating nodes\n"
<< "// and their place holder nodes.\n";
OS << "std::map<SDOperand, SDOperand> HolderMap;\n";
OS << "// Instance var to keep track of mapping of place holder nodes\n"
<< "// and their place handle nodes.\n";
OS << "std::map<SDOperand, SDOperand> HandleMap;\n";
OS << "// Instance var to keep track of mapping of place handle nodes\n"
<< "// and their replacement nodes.\n";
OS << "std::map<SDOperand, SDOperand> ReplaceMap;\n";
@ -3100,19 +3100,31 @@ void DAGISelEmitter::run(std::ostream &OS) {
OS << "\n";
OS << "// AddHandleReplacement - Note the pending replacement node for a\n"
<< "// holder node in ReplaceMap.\n";
<< "// handle node in ReplaceMap.\n";
OS << "void AddHandleReplacement(SDOperand N, SDOperand R) {\n";
OS << " std::map<SDOperand, SDOperand>::iterator HMI = HolderMap.find(N);\n";
OS << " if (HMI != HolderMap.end()) {\n";
OS << " std::map<SDOperand, SDOperand>::iterator HMI = HandleMap.find(N);\n";
OS << " if (HMI != HandleMap.end()) {\n";
OS << " ReplaceMap[HMI->second] = R;\n";
OS << " HolderMap.erase(N);\n";
OS << " HandleMap.erase(N);\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// ReplaceHolders - Replace all the holders with the real target\n";
OS << "// SelectDanglingHandles - Select replacements for all `dangling`\n";
OS << "// handles.Some handles do not yet have replacements because the\n";
OS << "// nodes they replacements have only dead readers.\n";
OS << "void SelectDanglingHandles() {\n";
OS << " for (std::map<SDOperand, SDOperand>::iterator I = "
<< "HandleMap.begin(),\n"
<< " E = HandleMap.end(); I != E; ++I) {\n";
OS << " SDOperand N = I->first;\n";
OS << " AddHandleReplacement(N, Select(N.getValue(0)));\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// ReplaceHandles - Replace all the handles with the real target\n";
OS << "// specific nodes.\n";
OS << "void ReplaceHolders() {\n";
OS << "void ReplaceHandles() {\n";
OS << " for (std::map<SDOperand, SDOperand>::iterator I = "
<< "ReplaceMap.begin(),\n"
<< " E = ReplaceMap.end(); I != E; ++I) {\n";
@ -3139,7 +3151,8 @@ void DAGISelEmitter::run(std::ostream &OS) {
OS << "// SelectRoot - Top level entry to DAG isel.\n";
OS << "SDOperand SelectRoot(SDOperand N) {\n";
OS << " SDOperand RetVal = Select(N);\n";
OS << " ReplaceHolders();\n";
OS << " SelectDanglingHandles();\n";
OS << " ReplaceHandles();\n";
OS << " ReplaceMap.clear();\n";
OS << " return RetVal;\n";
OS << "}\n";