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reduce stack usage of the recursive SelectCode function by out-lining each

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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
This commit is contained in:
Chris Lattner 2006-01-04 00:25:00 +00:00
parent 4e3c8e516f
commit 602f692461
1 changed files with 61 additions and 44 deletions
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105
utils/TableGen/DAGISelEmitter.cpp
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@ -2466,6 +2466,62 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
std::string InstNS = Target.inst_begin()->second.Namespace;
if (!InstNS.empty()) InstNS += "::";
// Group the patterns by their top-level opcodes.
std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName> PatternsByOpcode;
for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
TreePatternNode *Node = PatternsToMatch[i].getSrcPattern();
if (!Node->isLeaf()) {
PatternsByOpcode[Node->getOperator()].push_back(&PatternsToMatch[i]);
} else {
const ComplexPattern *CP;
if (IntInit *II =
dynamic_cast<IntInit*>(Node->getLeafValue())) {
PatternsByOpcode[getSDNodeNamed("imm")].push_back(&PatternsToMatch[i]);
} else if ((CP = NodeGetComplexPattern(Node, *this))) {
std::vector<Record*> OpNodes = CP->getRootNodes();
for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
PatternsByOpcode[OpNodes[j]].insert(PatternsByOpcode[OpNodes[j]].begin(),
&PatternsToMatch[i]);
}
} else {
std::cerr << "Unrecognized opcode '";
Node->dump();
std::cerr << "' on tree pattern '";
std::cerr << PatternsToMatch[i].getDstPattern()->getOperator()->getName();
std::cerr << "'!\n";
exit(1);
}
}
}
// Emit one Select_* method for each top-level opcode. We do this instead of
// emitting one giant switch statement to support compilers where this will
// result in the recursive functions taking less stack space.
for (std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
OS << "SDOperand Select_" << PBOI->first->getName() << "(SDOperand N) {\n";
const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
std::vector<PatternToMatch*> &Patterns = PBOI->second;
// We want to emit all of the matching code now. However, we want to emit
// the matches in order of minimal cost. Sort the patterns so the least
// cost one is at the start.
std::stable_sort(Patterns.begin(), Patterns.end(),
PatternSortingPredicate(*this));
for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
EmitCodeForPattern(*Patterns[i], OS);
OS << " std::cerr << \"Cannot yet select: \";\n"
<< " N.Val->dump(CurDAG);\n"
<< " std::cerr << '\\n';\n"
<< " abort();\n"
<< "}\n\n";
}
// Emit boilerplate.
OS << "// The main instruction selector code.\n"
<< "SDOperand SelectCode(SDOperand N) {\n"
@ -2544,55 +2600,16 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
<< " }\n"
<< " }\n";
// Group the patterns by their top-level opcodes.
std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName> PatternsByOpcode;
for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
TreePatternNode *Node = PatternsToMatch[i].getSrcPattern();
if (!Node->isLeaf()) {
PatternsByOpcode[Node->getOperator()].push_back(&PatternsToMatch[i]);
} else {
const ComplexPattern *CP;
if (IntInit *II =
dynamic_cast<IntInit*>(Node->getLeafValue())) {
PatternsByOpcode[getSDNodeNamed("imm")].push_back(&PatternsToMatch[i]);
} else if ((CP = NodeGetComplexPattern(Node, *this))) {
std::vector<Record*> OpNodes = CP->getRootNodes();
for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
PatternsByOpcode[OpNodes[j]].insert(PatternsByOpcode[OpNodes[j]].begin(),
&PatternsToMatch[i]);
}
} else {
std::cerr << "Unrecognized opcode '";
Node->dump();
std::cerr << "' on tree pattern '";
std::cerr << PatternsToMatch[i].getDstPattern()->getOperator()->getName();
std::cerr << "'!\n";
exit(1);
}
}
}
// Loop over all of the case statements.
// Loop over all of the case statements, emiting a call to each method we
// emitted above.
for (std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
std::vector<PatternToMatch*> &Patterns = PBOI->second;
OS << " case " << OpcodeInfo.getEnumName() << ":\n";
// We want to emit all of the matching code now. However, we want to emit
// the matches in order of minimal cost. Sort the patterns so the least
// cost one is at the start.
std::stable_sort(Patterns.begin(), Patterns.end(),
PatternSortingPredicate(*this));
for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
EmitCodeForPattern(*Patterns[i], OS);
OS << " break;\n\n";
OS << " case " << OpcodeInfo.getEnumName() << ": "
<< std::string(std::max(0, int(16-OpcodeInfo.getEnumName().size())), ' ')
<< "return Select_" << PBOI->first->getName() << "(N);\n";
}
OS << " } // end of big switch.\n\n"
<< " std::cerr << \"Cannot yet select: \";\n"