diff --git a/include/llvm/MC/MCParser/MCParsedAsmOperand.h b/include/llvm/MC/MCParser/MCParsedAsmOperand.h
index 0ce32d617ef..06e9dc90652 100644
--- a/include/llvm/MC/MCParser/MCParsedAsmOperand.h
+++ b/include/llvm/MC/MCParser/MCParsedAsmOperand.h
@@ -34,6 +34,13 @@ public:
   /// isMem - Is this a memory operand?
   virtual bool isMem() const = 0;
 
+  /// isMSAsmWildcard - Is this a wildcard operand?  This is specific to
+  /// MS-style inline assembly and should never happen in normal assembly.
+  virtual bool isMSAsmWildcard() const { return false; }
+
+  /// setMSAsmWildcard - Convert the operand into a wildcard.
+  virtual void setMSAsmWildcard(unsigned Size) { }
+
   /// getStartLoc - Get the location of the first token of this operand.
   virtual SMLoc getStartLoc() const = 0;
   /// getEndLoc - Get the location of the last token of this operand.
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 704d5f94261..2f78b16e445 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -158,7 +158,8 @@ struct X86Operand : public MCParsedAsmOperand {
     Token,
     Register,
     Immediate,
-    Memory
+    Memory,
+    MSAsmWildcard
   } Kind;
 
   SMLoc StartLoc, EndLoc;
@@ -185,6 +186,10 @@ struct X86Operand : public MCParsedAsmOperand {
       unsigned Scale;
       unsigned Size;
     } Mem;
+
+    struct {
+      unsigned Size;
+    } MSAsm;
   };
 
   X86Operand(KindTy K, SMLoc Start, SMLoc End)
@@ -318,25 +323,32 @@ struct X86Operand : public MCParsedAsmOperand {
 
   bool isMem() const { return Kind == Memory; }
   bool isMem8() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 8);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 8)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 8);
   }
   bool isMem16() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 16);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 16)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 16);
   }
   bool isMem32() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 32);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 32)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 32);
   }
   bool isMem64() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 64);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 64)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 64);
   }
   bool isMem80() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 80);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 80)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 80);
   }
   bool isMem128() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 128);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 128)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 128);
   }
   bool isMem256() const {
-    return Kind == Memory && (!Mem.Size || Mem.Size == 256);
+    return (Kind == Memory && (!Mem.Size || Mem.Size == 256)) ||
+      (Kind == MSAsmWildcard && MSAsm.Size == 256);
   }
 
   bool isMemVX32() const {
@@ -363,6 +375,12 @@ struct X86Operand : public MCParsedAsmOperand {
 
   bool isReg() const { return Kind == Register; }
 
+  bool isMSAsmWildcard() const { return Kind == MSAsmWildcard; }
+  void setMSAsmWildcard(unsigned Size) {
+    Kind = MSAsmWildcard;
+    this->MSAsm.Size = Size;
+  }
+
   void addExpr(MCInst &Inst, const MCExpr *Expr) const {
     // Add as immediates when possible.
     if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))