From fee7f01d1e193266b9ca88ef6b5466d543e4cec4 Mon Sep 17 00:00:00 2001 From: Craig Topper Date: Tue, 18 Sep 2012 06:10:45 +0000 Subject: Use variable type for index into mnemonic table. Shrinks size of index field on in tree targets. Saving static data space. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164108 91177308-0d34-0410-b5e6-96231b3b80d8 --- utils/TableGen/AsmMatcherEmitter.cpp | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'utils/TableGen/AsmMatcherEmitter.cpp') diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp index b7f98a0082..338a0b2fd2 100644 --- a/utils/TableGen/AsmMatcherEmitter.cpp +++ b/utils/TableGen/AsmMatcherEmitter.cpp @@ -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::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"; -- cgit v1.2.3-18-g5258