-/// extractSingletonRegisterForAsmOperand - Extract singleton register,
-/// if present, from specified token.
-void MatchableInfo::
-extractSingletonRegisterForAsmOperand(unsigned OperandNo,
- const AsmMatcherInfo &Info,
- std::string &RegisterPrefix) {
- StringRef Tok = AsmOperands[OperandNo].Token;
-
- // If this token is not an isolated token, i.e., it isn't separated from
- // other tokens (e.g. with whitespace), don't interpret it as a register name.
- if (!AsmOperands[OperandNo].IsIsolatedToken)
- return;
-
- if (RegisterPrefix.empty()) {
- std::string LoweredTok = Tok.lower();
- if (const CodeGenRegister *Reg = Info.Target.getRegisterByName(LoweredTok))
- AsmOperands[OperandNo].SingletonReg = Reg->TheDef;
- return;
- }
-
- if (!Tok.startswith(RegisterPrefix))
- return;
-
- StringRef RegName = Tok.substr(RegisterPrefix.size());
- if (const CodeGenRegister *Reg = Info.Target.getRegisterByName(RegName))
- AsmOperands[OperandNo].SingletonReg = Reg->TheDef;
-
- // If there is no register prefix (i.e. "%" in "%eax"), then this may
- // be some random non-register token, just ignore it.
- return;
-}
-