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Use variable type for index into mnemonic table. Shrinks size of index field on in tree targets. Saving static data space.

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llvm-svn: 164108
This commit is contained in:
Craig Topper 2012-09-18 06:10:45 +00:00
parent 6cba50cbb4
commit c4107aa8c2
1 changed files with 14 additions and 5 deletions
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19
utils/TableGen/AsmMatcherEmitter.cpp
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@ -2681,11 +2681,21 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
emitComputeAvailableFeatures(Info, OS);
StringToOffsetTable StringTable;
size_t MaxNumOperands = 0;
unsigned MaxMnemonicIndex = 0;
for (std::vector<MatchableInfo*>::const_iterator it =
Info.Matchables.begin(), ie = Info.Matchables.end();
it != ie; ++it)
MaxNumOperands = std::max(MaxNumOperands, (*it)->AsmOperands.size());
it != ie; ++it) {
MatchableInfo &II = **it;
MaxNumOperands = std::max(MaxNumOperands, II.AsmOperands.size());
// Store a pascal-style length byte in the mnemonic.
std::string LenMnemonic = char(II.Mnemonic.size()) + II.Mnemonic.str();
MaxMnemonicIndex = std::max(MaxMnemonicIndex,
StringTable.GetOrAddStringOffset(LenMnemonic, false));
}
// Emit the static match table; unused classes get initalized to 0 which is
// guaranteed to be InvalidMatchClass.
@ -2700,7 +2710,8 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
OS << "namespace {\n";
OS << " struct MatchEntry {\n";
OS << " static const char *const MnemonicTable;\n";
OS << " uint32_t Mnemonic;\n";
OS << " " << getMinimalTypeForRange(MaxMnemonicIndex)
<< " Mnemonic;\n";
OS << " uint16_t Opcode;\n";
OS << " " << getMinimalTypeForRange(Info.Matchables.size())
<< " ConvertFn;\n";
@ -2730,8 +2741,6 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
OS << "} // end anonymous namespace.\n\n";
StringToOffsetTable StringTable;
OS << "static const MatchEntry MatchTable["
<< Info.Matchables.size() << "] = {\n";