diff options
| -rw-r--r-- | llvm/include/llvm/Target/Target.td | 8 | ||||
| -rw-r--r-- | llvm/utils/TableGen/AsmMatcherEmitter.cpp | 34 |
2 files changed, 42 insertions, 0 deletions
diff --git a/llvm/include/llvm/Target/Target.td b/llvm/include/llvm/Target/Target.td index c5e8cfe5e9b..275be590221 100644 --- a/llvm/include/llvm/Target/Target.td +++ b/llvm/include/llvm/Target/Target.td @@ -941,6 +941,14 @@ class AsmParser { // written register name matcher bit ShouldEmitMatchRegisterName = 1; + // Set to true if the target needs a generated 'alternative register name' + // matcher. + // + // This generates a function which can be used to lookup registers from + // their aliases. This function will fail when called on targets where + // several registers share the same alias (i.e. not a 1:1 mapping). + bit ShouldEmitMatchRegisterAltName = 0; + // HasMnemonicFirst - Set to false if target instructions don't always // start with a mnemonic as the first token. bit HasMnemonicFirst = 1; diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp index 907eab677b5..07dbd285305 100644 --- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp +++ b/llvm/utils/TableGen/AsmMatcherEmitter.cpp @@ -2276,6 +2276,37 @@ static void emitMatchRegisterName(CodeGenTarget &Target, Record *AsmParser, OS << "}\n\n"; } +/// Emit the function to match a string to the target +/// specific register enum. +static void emitMatchRegisterAltName(CodeGenTarget &Target, Record *AsmParser, + raw_ostream &OS) { + // Construct the match list. + std::vector<StringMatcher::StringPair> Matches; + const auto &Regs = Target.getRegBank().getRegisters(); + for (const CodeGenRegister &Reg : Regs) { + + auto AltNames = Reg.TheDef->getValueAsListOfStrings("AltNames"); + + for (auto AltName : AltNames) { + AltName = StringRef(AltName).trim(); + + // don't handle empty alternative names + if (AltName.empty()) + continue; + + Matches.emplace_back(AltName, + "return " + utostr(Reg.EnumValue) + ";"); + } + } + + OS << "static unsigned MatchRegisterAltName(StringRef Name) {\n"; + + StringMatcher("Name", Matches, OS).Emit(); + + OS << " return 0;\n"; + OS << "}\n\n"; +} + static const char *getMinimalTypeForRange(uint64_t Range) { assert(Range <= 0xFFFFFFFFFFFFFFFFULL && "Enum too large"); if (Range > 0xFFFFFFFFULL) @@ -2816,6 +2847,9 @@ void AsmMatcherEmitter::run(raw_ostream &OS) { if (AsmParser->getValueAsBit("ShouldEmitMatchRegisterName")) emitMatchRegisterName(Target, AsmParser, OS); + if (AsmParser->getValueAsBit("ShouldEmitMatchRegisterAltName")) + emitMatchRegisterAltName(Target, AsmParser, OS); + OS << "#endif // GET_REGISTER_MATCHER\n\n"; OS << "\n#ifdef GET_SUBTARGET_FEATURE_NAME\n"; |
