diff --git a/include/llvm/Target/Target.td b/include/llvm/Target/Target.td
index cc19e0de8eb..ee9e83f5d1c 100644
--- a/include/llvm/Target/Target.td
+++ b/include/llvm/Target/Target.td
@@ -221,6 +221,9 @@ class Instruction {
   // purposes.
   bit isCodeGenOnly = 0;
 
+  // Is this instruction a pseudo instruction for use by the assembler parser.
+  bit isAsmParserOnly = 0;
+
   InstrItinClass Itinerary = NoItinerary;// Execution steps used for scheduling.
 
   string Constraints = "";  // OperandConstraint, e.g. $src = $dst.
diff --git a/utils/TableGen/X86RecognizableInstr.cpp b/utils/TableGen/X86RecognizableInstr.cpp
index 94ed15b0c37..b7085ae6c7b 100644
--- a/utils/TableGen/X86RecognizableInstr.cpp
+++ b/utils/TableGen/X86RecognizableInstr.cpp
@@ -230,6 +230,10 @@ void RecognizableInstr::processInstr(DisassemblerTables &tables,
                                    const CodeGenInstruction &insn,
                                    InstrUID uid)
 {
+  // Ignore "asm parser only" instructions.
+  if (insn.TheDef->getValueAsBit("isAsmParserOnly"))
+    return;
+  
   RecognizableInstr recogInstr(tables, insn, uid);
   
   recogInstr.emitInstructionSpecifier(tables);