Index: lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -1700,12 +1700,14 @@
       return ParseIntelOperator(IOK_TYPE);
   }
 
+  bool PtrInOperand = false;
   unsigned Size = getIntelMemOperandSize(Tok.getString());
   if (Size) {
     Parser.Lex(); // Eat operand size (e.g., byte, word).
     if (Tok.getString() != "PTR" && Tok.getString() != "ptr")
       return ErrorOperand(Tok.getLoc(), "Expected 'PTR' or 'ptr' token!");
     Parser.Lex(); // Eat ptr.
+    PtrInOperand = true;
   }
   Start = Tok.getLoc();
 
@@ -1761,9 +1763,16 @@
   if (!ParseRegister(RegNo, Start, End)) {
     // If this is a segment register followed by a ':', then this is the start
     // of a segment override, otherwise this is a normal register reference.
-    if (getLexer().isNot(AsmToken::Colon))
+    // In case it is a normal register and there is ptr in the operand this 
+    // is an error
+    if (getLexer().isNot(AsmToken::Colon)){
+      if (PtrInOperand){
+        return ErrorOperand(Start, "ambiguous operand - could not "
+          "determine if register or register indirect addressing");
+      }
       return X86Operand::CreateReg(RegNo, Start, End);
-
+    }
+    
     return ParseIntelSegmentOverride(/*SegReg=*/RegNo, Start, Size);
   }
 
Index: test/MC/X86/intel-syntax-ambiguous.s
===================================================================
--- test/MC/X86/intel-syntax-ambiguous.s
+++ test/MC/X86/intel-syntax-ambiguous.s
@@ -45,3 +45,12 @@
 
 fadd   "?half@?0??bar@@YAXXZ@4NA"
 // CHECK: error: ambiguous operand size for instruction 'fadd'
+
+// Instruction line with PTR inside check that they don't accept register as memory.
+
+// CHECK:  error: ambiguous operand - could not determine if register or register indirect addressing
+// CHECK: andps xmm1, xmmword ptr xmm1
+andps xmm1, xmmword ptr xmm1
+// CHECK:  error: ambiguous operand - could not determine if register or register indirect addressing
+// CHECK: andps xmmword ptr xmm1, xmm1
+andps xmmword ptr xmm1, xmm1