4 files changed, 13 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/MIRParser/MILexer.cpp b/llvm/lib/CodeGen/MIRParser/MILexer.cpp
index 5ae1b10afd6..e15a4d1e753 100644
--- a/llvm/lib/CodeGen/MIRParser/MILexer.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MILexer.cpp
@@ -191,6 +191,7 @@ static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
       .Case("dead", MIToken::kw_dead)
       .Case("killed", MIToken::kw_killed)
       .Case("undef", MIToken::kw_undef)
+      .Case("internal", MIToken::kw_internal)
       .Case("early-clobber", MIToken::kw_early_clobber)
       .Case("debug-use", MIToken::kw_debug_use)
       .Case("frame-setup", MIToken::kw_frame_setup)
diff --git a/llvm/lib/CodeGen/MIRParser/MILexer.h b/llvm/lib/CodeGen/MIRParser/MILexer.h
index 2f55ae4f0db..e7abbb2dd89 100644
--- a/llvm/lib/CodeGen/MIRParser/MILexer.h
+++ b/llvm/lib/CodeGen/MIRParser/MILexer.h
@@ -52,6 +52,7 @@ struct MIToken {
     kw_dead,
     kw_killed,
     kw_undef,
+    kw_internal,
     kw_early_clobber,
     kw_debug_use,
     kw_frame_setup,
@@ -138,7 +139,8 @@ public:
   bool isRegisterFlag() const {
     return Kind == kw_implicit || Kind == kw_implicit_define ||
            Kind == kw_dead || Kind == kw_killed || Kind == kw_undef ||
-           Kind == kw_early_clobber || Kind == kw_debug_use;
+           Kind == kw_internal || Kind == kw_early_clobber ||
+           Kind == kw_debug_use;
   }
 
   bool isMemoryOperandFlag() const {
diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index 36b34395d4d..7984116efcb 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -777,13 +777,15 @@ bool MIParser::parseRegisterFlag(unsigned &Flags) {
   case MIToken::kw_undef:
     Flags |= RegState::Undef;
     break;
+  case MIToken::kw_internal:
+    Flags |= RegState::InternalRead;
+    break;
   case MIToken::kw_early_clobber:
     Flags |= RegState::EarlyClobber;
     break;
   case MIToken::kw_debug_use:
     Flags |= RegState::Debug;
     break;
-  // TODO: parse the other register flags.
   default:
     llvm_unreachable("The current token should be a register flag");
   }
@@ -828,7 +830,8 @@ bool MIParser::parseRegisterOperand(MachineOperand &Dest, bool IsDef) {
   Dest = MachineOperand::CreateReg(
       Reg, Flags & RegState::Define, Flags & RegState::Implicit,
       Flags & RegState::Kill, Flags & RegState::Dead, Flags & RegState::Undef,
-      Flags & RegState::EarlyClobber, SubReg, Flags & RegState::Debug);
+      Flags & RegState::EarlyClobber, SubReg, Flags & RegState::Debug,
+      Flags & RegState::InternalRead);
   return false;
 }
 
@@ -1235,6 +1238,7 @@ bool MIParser::parseMachineOperand(MachineOperand &Dest) {
   case MIToken::kw_dead:
   case MIToken::kw_killed:
   case MIToken::kw_undef:
+  case MIToken::kw_internal:
   case MIToken::kw_early_clobber:
   case MIToken::kw_debug_use:
   case MIToken::underscore:
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index 8bb5203c507..957cb20eace 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -617,9 +617,11 @@ void MIPrinter::print(const MachineOperand &Op, const TargetRegisterInfo *TRI) {
   printTargetFlags(Op);
   switch (Op.getType()) {
   case MachineOperand::MO_Register:
-    // TODO: Print the other register flags.
+    // FIXME: Serialize the tied register.
     if (Op.isImplicit())
       OS << (Op.isDef() ? "implicit-def " : "implicit ");
+    if (Op.isInternalRead())
+      OS << "internal ";
     if (Op.isDead())
       OS << "dead ";
     if (Op.isKill())