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reduce stack usage of the recursive SelectCode function by out-lining each
case of the switch statement into its own method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25069 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2466,6 +2466,62 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
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std::string InstNS = Target.inst_begin()->second.Namespace;
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if (!InstNS.empty()) InstNS += "::";
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// Group the patterns by their top-level opcodes.
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std::map<Record*, std::vector<PatternToMatch*>,
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CompareByRecordName> PatternsByOpcode;
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for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
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TreePatternNode *Node = PatternsToMatch[i].getSrcPattern();
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if (!Node->isLeaf()) {
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PatternsByOpcode[Node->getOperator()].push_back(&PatternsToMatch[i]);
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} else {
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const ComplexPattern *CP;
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if (IntInit *II =
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dynamic_cast<IntInit*>(Node->getLeafValue())) {
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PatternsByOpcode[getSDNodeNamed("imm")].push_back(&PatternsToMatch[i]);
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} else if ((CP = NodeGetComplexPattern(Node, *this))) {
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std::vector<Record*> OpNodes = CP->getRootNodes();
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for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
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PatternsByOpcode[OpNodes[j]].insert(PatternsByOpcode[OpNodes[j]].begin(),
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&PatternsToMatch[i]);
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}
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} else {
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std::cerr << "Unrecognized opcode '";
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Node->dump();
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std::cerr << "' on tree pattern '";
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std::cerr << PatternsToMatch[i].getDstPattern()->getOperator()->getName();
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std::cerr << "'!\n";
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exit(1);
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}
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}
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}
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// Emit one Select_* method for each top-level opcode. We do this instead of
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// emitting one giant switch statement to support compilers where this will
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// result in the recursive functions taking less stack space.
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for (std::map<Record*, std::vector<PatternToMatch*>,
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CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
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E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
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OS << "SDOperand Select_" << PBOI->first->getName() << "(SDOperand N) {\n";
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const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
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std::vector<PatternToMatch*> &Patterns = PBOI->second;
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// We want to emit all of the matching code now. However, we want to emit
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// the matches in order of minimal cost. Sort the patterns so the least
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// cost one is at the start.
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std::stable_sort(Patterns.begin(), Patterns.end(),
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PatternSortingPredicate(*this));
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for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
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EmitCodeForPattern(*Patterns[i], OS);
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OS << " std::cerr << \"Cannot yet select: \";\n"
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<< " N.Val->dump(CurDAG);\n"
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<< " std::cerr << '\\n';\n"
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<< " abort();\n"
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<< "}\n\n";
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}
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// Emit boilerplate.
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OS << "// The main instruction selector code.\n"
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<< "SDOperand SelectCode(SDOperand N) {\n"
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@ -2544,56 +2600,17 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
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<< " }\n"
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<< " }\n";
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// Group the patterns by their top-level opcodes.
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std::map<Record*, std::vector<PatternToMatch*>,
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CompareByRecordName> PatternsByOpcode;
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for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
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TreePatternNode *Node = PatternsToMatch[i].getSrcPattern();
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if (!Node->isLeaf()) {
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PatternsByOpcode[Node->getOperator()].push_back(&PatternsToMatch[i]);
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} else {
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const ComplexPattern *CP;
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if (IntInit *II =
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dynamic_cast<IntInit*>(Node->getLeafValue())) {
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PatternsByOpcode[getSDNodeNamed("imm")].push_back(&PatternsToMatch[i]);
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} else if ((CP = NodeGetComplexPattern(Node, *this))) {
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std::vector<Record*> OpNodes = CP->getRootNodes();
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for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
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PatternsByOpcode[OpNodes[j]].insert(PatternsByOpcode[OpNodes[j]].begin(),
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&PatternsToMatch[i]);
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}
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} else {
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std::cerr << "Unrecognized opcode '";
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Node->dump();
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std::cerr << "' on tree pattern '";
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std::cerr << PatternsToMatch[i].getDstPattern()->getOperator()->getName();
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std::cerr << "'!\n";
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exit(1);
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}
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}
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}
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// Loop over all of the case statements.
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// Loop over all of the case statements, emiting a call to each method we
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// emitted above.
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for (std::map<Record*, std::vector<PatternToMatch*>,
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CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
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E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
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const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
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std::vector<PatternToMatch*> &Patterns = PBOI->second;
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OS << " case " << OpcodeInfo.getEnumName() << ":\n";
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// We want to emit all of the matching code now. However, we want to emit
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// the matches in order of minimal cost. Sort the patterns so the least
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// cost one is at the start.
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std::stable_sort(Patterns.begin(), Patterns.end(),
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PatternSortingPredicate(*this));
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for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
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EmitCodeForPattern(*Patterns[i], OS);
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OS << " break;\n\n";
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OS << " case " << OpcodeInfo.getEnumName() << ": "
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<< std::string(std::max(0, int(16-OpcodeInfo.getEnumName().size())), ' ')
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<< "return Select_" << PBOI->first->getName() << "(N);\n";
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}
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OS << " } // end of big switch.\n\n"
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<< " std::cerr << \"Cannot yet select: \";\n"
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<< " N.Val->dump(CurDAG);\n"
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