Index: llvm/trunk/include/llvm/IR/IntrinsicsX86.td
===================================================================
--- llvm/trunk/include/llvm/IR/IntrinsicsX86.td
+++ llvm/trunk/include/llvm/IR/IntrinsicsX86.td
@@ -3897,6 +3897,14 @@
 }
 
 //===----------------------------------------------------------------------===//
+// Support protection key
+let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
+  def int_x86_rdpkru : GCCBuiltin <"__builtin_ia32_rdpkru">,
+              Intrinsic<[llvm_i32_ty], [], [IntrNoMem]>;
+  def int_x86_wrpkru : GCCBuiltin<"__builtin_ia32_wrpkru">,
+              Intrinsic<[], [llvm_i32_ty], [IntrNoMem]>;
+}
+//===----------------------------------------------------------------------===//
 // Half float conversion
 
 let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
Index: llvm/trunk/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
===================================================================
--- llvm/trunk/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
+++ llvm/trunk/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
@@ -707,12 +707,12 @@
     case X86II::MRM_E3: case X86II::MRM_E4: case X86II::MRM_E5:
     case X86II::MRM_E8: case X86II::MRM_E9: case X86II::MRM_EA:
     case X86II::MRM_EB: case X86II::MRM_EC: case X86II::MRM_ED:
-    case X86II::MRM_EE: case X86II::MRM_F0: case X86II::MRM_F1:
-    case X86II::MRM_F2: case X86II::MRM_F3: case X86II::MRM_F4:
-    case X86II::MRM_F5: case X86II::MRM_F6: case X86II::MRM_F7:
-    case X86II::MRM_F8: case X86II::MRM_F9: case X86II::MRM_FA:
-    case X86II::MRM_FB: case X86II::MRM_FC: case X86II::MRM_FD:
-    case X86II::MRM_FE: case X86II::MRM_FF:
+    case X86II::MRM_EE: case X86II::MRM_EF: case X86II::MRM_F0:
+    case X86II::MRM_F1: case X86II::MRM_F2: case X86II::MRM_F3:
+    case X86II::MRM_F4: case X86II::MRM_F5: case X86II::MRM_F6:
+    case X86II::MRM_F7: case X86II::MRM_F8: case X86II::MRM_F9:
+    case X86II::MRM_FA: case X86II::MRM_FB: case X86II::MRM_FC:
+    case X86II::MRM_FD: case X86II::MRM_FE: case X86II::MRM_FF:
       return -1;
     }
   }
Index: llvm/trunk/lib/Target/X86/X86InstrSystem.td
===================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSystem.td
+++ llvm/trunk/lib/Target/X86/X86InstrSystem.td
@@ -549,6 +549,12 @@
 }
 let Defs = [RAX, RDX, RSI], Uses = [RAX, RSI] in
   def MONTMUL : I<0xa6, MRM_C0, (outs), (ins), "montmul", []>, TB;
+//==-----------------------------------------------------------------------===//
+// PKU  - enable protection key
+let Defs = [EAX, EDX], Uses = [ECX] in 
+  def RDPKRU : I<0x01, MRM_EE, (outs), (ins), "rdpkru", []>, TB;
+let Uses = [EAX, ECX, EDX] in
+  def WRPKRU : I<0x01, MRM_EF, (outs), (ins), "wrpkru", []>, TB;
 
 //===----------------------------------------------------------------------===//
 // FS/GS Base Instructions
Index: llvm/trunk/test/MC/X86/X86_64-pku.s
===================================================================
--- llvm/trunk/test/MC/X86/X86_64-pku.s
+++ llvm/trunk/test/MC/X86/X86_64-pku.s
@@ -0,0 +1,8 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown -mattr=+pku --show-encoding < %s | FileCheck %s
+// CHECK: rdpkru
+// CHECK: encoding: [0x0f,0x01,0xee]
+   rdpkru
+
+// CHECK: wrpkru
+// CHECK: encoding: [0x0f,0x01,0xef]
+   wrpkru 
\ No newline at end of file
Index: llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp
===================================================================
--- llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp
+++ llvm/trunk/utils/TableGen/X86RecognizableInstr.cpp
@@ -796,12 +796,12 @@
   case X86Local::MRM_E3: case X86Local::MRM_E4: case X86Local::MRM_E5:
   case X86Local::MRM_E8: case X86Local::MRM_E9: case X86Local::MRM_EA:
   case X86Local::MRM_EB: case X86Local::MRM_EC: case X86Local::MRM_ED:
-  case X86Local::MRM_EE: case X86Local::MRM_F0: case X86Local::MRM_F1:
-  case X86Local::MRM_F2: case X86Local::MRM_F3: case X86Local::MRM_F4:
-  case X86Local::MRM_F5: case X86Local::MRM_F6: case X86Local::MRM_F7:
-  case X86Local::MRM_F9: case X86Local::MRM_FA: case X86Local::MRM_FB:
-  case X86Local::MRM_FC: case X86Local::MRM_FD: case X86Local::MRM_FE:
-  case X86Local::MRM_FF:
+  case X86Local::MRM_EE: case X86Local::MRM_EF: case X86Local::MRM_F0:
+  case X86Local::MRM_F1: case X86Local::MRM_F2: case X86Local::MRM_F3:
+  case X86Local::MRM_F4: case X86Local::MRM_F5: case X86Local::MRM_F6:
+  case X86Local::MRM_F7: case X86Local::MRM_F9: case X86Local::MRM_FA:
+  case X86Local::MRM_FB:  case X86Local::MRM_FC: case X86Local::MRM_FD:
+  case X86Local::MRM_FE:  case X86Local::MRM_FF:
     // Ignored.
     break;
   }