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now that the opcode is trivially exposed, start matching instructions

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by doing a binary search over the mnemonic instead of doing a linear
search through all possible instructions.  This implements rdar://7785064


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113171 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-09-06 21:22:45 +00:00
parent 96352e5ceb
commit 2b1f943444
1 changed files with 22 additions and 6 deletions
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28
utils/TableGen/AsmMatcherEmitter.cpp
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@ -1629,7 +1629,18 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
OS << " ConversionKind ConvertFn;\n";
OS << " MatchClassKind Classes[" << MaxNumOperands << "];\n";
OS << " unsigned RequiredFeatures;\n";
OS << " };\n\n";
OS << "// Predicate for searching for an opcode.\n";
OS << " struct LessOpcode {\n";
OS << " bool operator()(const MatchEntry &LHS, StringRef RHS) {\n";
OS << " return StringRef(LHS.Mnemonic) < RHS;\n";
OS << " }\n";
OS << " bool operator()(StringRef LHS, const MatchEntry &RHS) {\n";
OS << " return LHS < StringRef(RHS.Mnemonic);\n";
OS << " }\n";
OS << " };\n";
OS << "} // end anonymous namespace.\n\n";
OS << "static const MatchEntry MatchTable["
@ -1699,16 +1710,21 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
OS << " // Get the instruction mneumonic, which is the first token.\n";
OS << " StringRef Mnemonic = ((" << Target.getName()
<< "Operand*)Operands[0])->getToken();\n\n";
OS << " bool HadMatchOtherThanFeatures = false;\n\n";
// Emit code to search the table.
OS << " // Search the table.\n";
OS << " bool HadMatchOtherThanFeatures = false;\n";
OS << " for (const MatchEntry *it = MatchTable, "
<< "*ie = MatchTable + " << Info.Instructions.size()
<< "; it != ie; ++it) {\n";
OS << " std::pair<const MatchEntry*, const MatchEntry*> MnemonicRange =\n";
OS << " std::equal_range(MatchTable, MatchTable+"
<< Info.Instructions.size() << ", Mnemonic, LessOpcode());\n\n";
OS << " for (const MatchEntry *it = MnemonicRange.first, "
<< "*ie = MnemonicRange.second;\n"
OS << " it != ie; ++it) {\n";
OS << " // Instruction mneumonic must match.\n";
OS << " if (Mnemonic != it->Mnemonic) continue;";
OS << " if (Mnemonic != it->Mnemonic) continue;\n";
// Emit check that the subclasses match.
for (unsigned i = 0; i != MaxNumOperands; ++i) {