3 files changed, 30 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index eb8832a92dc..236b59121cf 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -125,6 +125,7 @@ public:
   bool parseStandaloneMBB(MachineBasicBlock *&MBB);
   bool parseStandaloneNamedRegister(unsigned &Reg);
   bool parseStandaloneVirtualRegister(VRegInfo *&Info);
+  bool parseStandaloneRegister(unsigned &Reg);
   bool parseStandaloneStackObject(int &FI);
   bool parseStandaloneMDNode(MDNode *&Node);
 
@@ -728,6 +729,22 @@ bool MIParser::parseStandaloneVirtualRegister(VRegInfo *&Info) {
   return false;
 }
 
+bool MIParser::parseStandaloneRegister(unsigned &Reg) {
+  lex();
+  if (Token.isNot(MIToken::NamedRegister) &&
+      Token.isNot(MIToken::VirtualRegister))
+    return error("expected either a named or virtual register");
+
+  VRegInfo *Info;
+  if (parseRegister(Reg, Info))
+    return true;
+
+  lex();
+  if (Token.isNot(MIToken::Eof))
+    return error("expected end of string after the register reference");
+  return false;
+}
+
 bool MIParser::parseStandaloneStackObject(int &FI) {
   lex();
   if (Token.isNot(MIToken::StackObject))
@@ -2230,6 +2247,12 @@ bool llvm::parseMBBReference(PerFunctionMIParsingState &PFS,
   return MIParser(PFS, Error, Src).parseStandaloneMBB(MBB);
 }
 
+bool llvm::parseRegisterReference(PerFunctionMIParsingState &PFS,
+                                  unsigned &Reg, StringRef Src,
+                                  SMDiagnostic &Error) {
+  return MIParser(PFS, Error, Src).parseStandaloneRegister(Reg);
+}
+
 bool llvm::parseNamedRegisterReference(PerFunctionMIParsingState &PFS,
                                        unsigned &Reg, StringRef Src,
                                        SMDiagnostic &Error) {
diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.h b/llvm/lib/CodeGen/MIRParser/MIParser.h
index a5f86ad945d..93a4d84ba62 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.h
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.h
@@ -96,6 +96,10 @@ bool parseMBBReference(PerFunctionMIParsingState &PFS,
                        MachineBasicBlock *&MBB, StringRef Src,
                        SMDiagnostic &Error);
 
+bool parseRegisterReference(PerFunctionMIParsingState &PFS,
+                            unsigned &Reg, StringRef Src,
+                            SMDiagnostic &Error);
+
 bool parseNamedRegisterReference(PerFunctionMIParsingState &PFS, unsigned &Reg,
                                  StringRef Src, SMDiagnostic &Error);
 
diff --git a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
index d95caf833ce..f6a403b35a0 100644
--- a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
@@ -439,8 +439,9 @@ bool MIRParserImpl::parseRegisterInfo(PerFunctionMIParsingState &PFS,
       if (Info.Kind != VRegInfo::NORMAL)
         return error(VReg.Class.SourceRange.Start,
               Twine("preferred register can only be set for normal vregs"));
-      if (parseNamedRegisterReference(PFS, Info.PreferredReg,
-                                      VReg.PreferredRegister.Value, Error))
+
+      if (parseRegisterReference(PFS, Info.PreferredReg,
+                                 VReg.PreferredRegister.Value, Error))
         return error(Error, VReg.PreferredRegister.SourceRange);
     }
   }