Index: llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
===================================================================
--- llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -204,6 +204,8 @@
 
   struct BarrierOp {
     unsigned Val; // Not the enum since not all values have names.
+    const char *Data;
+    unsigned Length;
   };
 
   struct SysRegOp {
@@ -220,6 +222,8 @@
 
   struct PrefetchOp {
     unsigned Val;
+    const char *Data;
+    unsigned Length;
   };
 
   struct ShiftExtendOp {
@@ -347,6 +351,11 @@
     return Barrier.Val;
   }
 
+  StringRef getBarrierName() const {
+    assert(Kind == k_Barrier && "Invalid access!");
+    return StringRef(Barrier.Data, Barrier.Length);
+  }
+
   unsigned getReg() const override {
     assert(Kind == k_Register && "Invalid access!");
     return Reg.RegNum;
@@ -382,6 +391,11 @@
     return Prefetch.Val;
   }
 
+  StringRef getPrefetchName() const {
+    assert(Kind == k_Prefetch && "Invalid access!");
+    return StringRef(Prefetch.Data, Prefetch.Length);
+  }
+
   AArch64_AM::ShiftExtendType getShiftExtendType() const {
     assert(Kind == k_ShiftExtend && "Invalid access!");
     return ShiftExtend.Type;
@@ -1595,10 +1609,14 @@
     return Op;
   }
 
-  static std::unique_ptr<AArch64Operand> CreateBarrier(unsigned Val, SMLoc S,
+  static std::unique_ptr<AArch64Operand> CreateBarrier(unsigned Val,
+                                                       StringRef Str,
+                                                       SMLoc S,
                                                        MCContext &Ctx) {
     auto Op = make_unique<AArch64Operand>(k_Barrier, Ctx);
     Op->Barrier.Val = Val;
+    Op->Barrier.Data = Str.data();
+    Op->Barrier.Length = Str.size();
     Op->StartLoc = S;
     Op->EndLoc = S;
     return Op;
@@ -1629,10 +1647,14 @@
     return Op;
   }
 
-  static std::unique_ptr<AArch64Operand> CreatePrefetch(unsigned Val, SMLoc S,
+  static std::unique_ptr<AArch64Operand> CreatePrefetch(unsigned Val,
+                                                        StringRef Str,
+                                                        SMLoc S,
                                                         MCContext &Ctx) {
     auto Op = make_unique<AArch64Operand>(k_Prefetch, Ctx);
     Op->Prefetch.Val = Val;
+    Op->Barrier.Data = Str.data();
+    Op->Barrier.Length = Str.size();
     Op->StartLoc = S;
     Op->EndLoc = S;
     return Op;
@@ -1660,9 +1682,8 @@
        << AArch64_AM::getFPImmFloat(getFPImm()) << ") >";
     break;
   case k_Barrier: {
-    bool Valid;
-    StringRef Name = AArch64DB::DBarrierMapper().toString(getBarrier(), Valid);
-    if (Valid)
+    StringRef Name = getBarrierName();
+    if (!Name.empty())
       OS << "<barrier " << Name << ">";
     else
       OS << "<barrier invalid #" << getBarrier() << ">";
@@ -1705,9 +1726,8 @@
     OS << "c" << getSysCR();
     break;
   case k_Prefetch: {
-    bool Valid;
-    StringRef Name = AArch64PRFM::PRFMMapper().toString(getPrefetch(), Valid);
-    if (Valid)
+    StringRef Name = getPrefetchName();
+    if (!Name.empty())
       OS << "<prfop " << Name << ">";
     else
       OS << "<prfop invalid #" << getPrefetch() << ">";
@@ -1950,7 +1970,11 @@
       return MatchOperand_ParseFail;
     }
 
-    Operands.push_back(AArch64Operand::CreatePrefetch(prfop, S, getContext()));
+    bool Valid;
+    auto Mapper = AArch64PRFM::PRFMMapper();
+    StringRef Name = Mapper.toString(MCE->getValue(), Valid);
+    Operands.push_back(AArch64Operand::CreatePrefetch(prfop, Name,
+                                                      S, getContext()));
     return MatchOperand_Success;
   }
 
@@ -1960,14 +1984,16 @@
   }
 
   bool Valid;
-  unsigned prfop = AArch64PRFM::PRFMMapper().fromString(Tok.getString(), Valid);
+  auto Mapper = AArch64PRFM::PRFMMapper();
+  unsigned prfop = Mapper.fromString(Tok.getString(), Valid);
   if (!Valid) {
     TokError("pre-fetch hint expected");
     return MatchOperand_ParseFail;
   }
 
   Parser.Lex(); // Eat identifier token.
-  Operands.push_back(AArch64Operand::CreatePrefetch(prfop, S, getContext()));
+  Operands.push_back(AArch64Operand::CreatePrefetch(prfop, Tok.getString(),
+                                                    S, getContext()));
   return MatchOperand_Success;
 }
 
@@ -2569,8 +2595,11 @@
       Error(ExprLoc, "barrier operand out of range");
       return MatchOperand_ParseFail;
     }
-    Operands.push_back(
-        AArch64Operand::CreateBarrier(MCE->getValue(), ExprLoc, getContext()));
+    bool Valid;
+    auto Mapper = AArch64DB::DBarrierMapper();
+    StringRef Name = Mapper.toString(MCE->getValue(), Valid);
+    Operands.push_back( AArch64Operand::CreateBarrier(MCE->getValue(), Name,
+                                                      ExprLoc, getContext()));
     return MatchOperand_Success;
   }
 
@@ -2580,7 +2609,8 @@
   }
 
   bool Valid;
-  unsigned Opt = AArch64DB::DBarrierMapper().fromString(Tok.getString(), Valid);
+  auto Mapper = AArch64DB::DBarrierMapper();
+  unsigned Opt = Mapper.fromString(Tok.getString(), Valid);
   if (!Valid) {
     TokError("invalid barrier option name");
     return MatchOperand_ParseFail;
@@ -2592,8 +2622,8 @@
     return MatchOperand_ParseFail;
   }
 
-  Operands.push_back(
-      AArch64Operand::CreateBarrier(Opt, getLoc(), getContext()));
+  Operands.push_back( AArch64Operand::CreateBarrier(Opt, Tok.getString(),
+                                                    getLoc(), getContext()));
   Parser.Lex(); // Consume the option
 
   return MatchOperand_Success;
@@ -2618,8 +2648,8 @@
   assert(IsKnown == (MSRReg != -1U) &&
          "register should be -1 if and only if it's unknown");
 
-  uint32_t PStateField =
-      AArch64PState::PStateMapper().fromString(Tok.getString(), IsKnown);
+  auto PStateMapper = AArch64PState::PStateMapper();
+  uint32_t PStateField = PStateMapper.fromString(Tok.getString(), IsKnown);
   assert(IsKnown == (PStateField != -1U) &&
          "register should be -1 if and only if it's unknown");