Index: include/llvm/IR/IntrinsicsX86.td
===================================================================
--- include/llvm/IR/IntrinsicsX86.td
+++ include/llvm/IR/IntrinsicsX86.td
@@ -4872,3 +4872,13 @@
               Intrinsic<[llvm_v16f32_ty],
               [llvm_v16f32_ty, llvm_v16i32_ty, llvm_v16i32_ty], [IntrNoMem]>;
 }
+
+//===----------------------------------------------------------------------===//
+// ENQCMD - Enqueue Stores Instructions
+
+let TargetPrefix = "x86" in {
+  def int_x86_enqcmd : GCCBuiltin<"__builtin_ia32_enqcmd">,
+              Intrinsic<[llvm_i8_ty], [llvm_ptr_ty, llvm_ptr_ty], []>;
+  def int_x86_enqcmds : GCCBuiltin<"__builtin_ia32_enqcmds">,
+              Intrinsic<[llvm_i8_ty], [llvm_ptr_ty, llvm_ptr_ty], []>;
+}
Index: lib/Support/Host.cpp
===================================================================
--- lib/Support/Host.cpp
+++ lib/Support/Host.cpp
@@ -1380,6 +1380,7 @@
   Features["cldemote"]        = HasLeaf7 && ((ECX >> 25) & 1);
   Features["movdiri"]         = HasLeaf7 && ((ECX >> 27) & 1);
   Features["movdir64b"]       = HasLeaf7 && ((ECX >> 28) & 1);
+  Features["enqcmd"]          = HasLeaf7 && ((ECX >> 29) & 1);
 
   // There are two CPUID leafs which information associated with the pconfig
   // instruction:
Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -263,6 +263,8 @@
                                     "Support RDPID instructions">;
 def FeatureWAITPKG  : SubtargetFeature<"waitpkg", "HasWAITPKG", "true",
                                       "Wait and pause enhancements">;
+def FeatureENQCMD : SubtargetFeature<"enqcmd", "HasENQCMD", "true",
+                                     "Has ENQCMD instructions">;
 // On some processors, instructions that implicitly take two memory operands are
 // slow. In practice, this means that CALL, PUSH, and POP with memory operands
 // should be avoided in favor of a MOV + register CALL/PUSH/POP.
Index: lib/Target/X86/X86ISelDAGToDAG.cpp
===================================================================
--- lib/Target/X86/X86ISelDAGToDAG.cpp
+++ lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2071,6 +2071,8 @@
       Parent->getOpcode() != ISD::INTRINSIC_W_CHAIN && // unaligned loads, fixme
       Parent->getOpcode() != ISD::INTRINSIC_VOID && // nontemporal stores
       Parent->getOpcode() != X86ISD::TLSCALL && // Fixme
+      Parent->getOpcode() != X86ISD::ENQCMD && // Fixme
+      Parent->getOpcode() != X86ISD::ENQCMDS && // Fixme
       Parent->getOpcode() != X86ISD::EH_SJLJ_SETJMP && // setjmp
       Parent->getOpcode() != X86ISD::EH_SJLJ_LONGJMP) { // longjmp
     unsigned AddrSpace =
Index: lib/Target/X86/X86ISelLowering.h
===================================================================
--- lib/Target/X86/X86ISelLowering.h
+++ lib/Target/X86/X86ISelLowering.h
@@ -589,6 +589,9 @@
       // User level wait
       UMWAIT, TPAUSE,
 
+      // Enqueue Stores Instructions
+      ENQCMD, ENQCMDS,
+
       // Compare and swap.
       LCMPXCHG_DAG = ISD::FIRST_TARGET_MEMORY_OPCODE,
       LCMPXCHG8_DAG,
Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -23233,6 +23233,27 @@
       return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(), SetCC,
                          Operation.getValue(1));
     }
+    case Intrinsic::x86_enqcmd:
+    case Intrinsic::x86_enqcmds: {
+      SDLoc dl(Op);
+      SDValue Chain = Op.getOperand(0);
+      SDVTList VTs = DAG.getVTList(MVT::i32, MVT::Other);
+      unsigned Opcode;
+      switch (IntNo) {
+      default: llvm_unreachable("Impossible intrinsic!");
+      case Intrinsic::x86_enqcmd:
+        Opcode = X86ISD::ENQCMD;
+        break;
+      case Intrinsic::x86_enqcmds:
+        Opcode = X86ISD::ENQCMDS;
+        break;
+      }
+      SDValue Operation = DAG.getNode(Opcode, dl, VTs, Chain, Op.getOperand(2),
+                                      Op.getOperand(3));
+      SDValue SetCC = getSETCC(X86::COND_E, Operation.getValue(0), dl, DAG);
+      return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(), SetCC,
+                         Operation.getValue(1));
+    }
     }
     return SDValue();
   }
@@ -28213,6 +28234,8 @@
   case X86ISD::NT_BRIND:           return "X86ISD::NT_BRIND";
   case X86ISD::UMWAIT:             return "X86ISD::UMWAIT";
   case X86ISD::TPAUSE:             return "X86ISD::TPAUSE";
+  case X86ISD::ENQCMD:             return "X86ISD:ENQCMD";
+  case X86ISD::ENQCMDS:            return "X86ISD:ENQCMDS";
   }
   return nullptr;
 }
Index: lib/Target/X86/X86InstrInfo.td
===================================================================
--- lib/Target/X86/X86InstrInfo.td
+++ lib/Target/X86/X86InstrInfo.td
@@ -127,6 +127,9 @@
 
 def SDT_X86MEMBARRIER : SDTypeProfile<0, 0, []>;
 
+def SDT_X86ENQCMD : SDTypeProfile<1, 2, [SDTCisVT<0, i32>,
+                                         SDTCisPtrTy<1>, SDTCisSameAs<1, 2>]>;
+
 def X86MemBarrier : SDNode<"X86ISD::MEMBARRIER", SDT_X86MEMBARRIER,
                             [SDNPHasChain,SDNPSideEffect]>;
 def X86MFence : SDNode<"X86ISD::MFENCE", SDT_X86MEMBARRIER,
@@ -307,6 +310,11 @@
                                             SDTCisVT<2, i32>, SDTCisVT<3, i32>]>,
                        [SDNPHasChain, SDNPSideEffect]>;
 
+def X86enqcmd : SDNode<"X86ISD::ENQCMD", SDT_X86ENQCMD,
+                       [SDNPHasChain, SDNPSideEffect]>;
+def X86enqcmds : SDNode<"X86ISD::ENQCMDS", SDT_X86ENQCMD,
+                       [SDNPHasChain, SDNPSideEffect]>;
+
 //===----------------------------------------------------------------------===//
 // X86 Operand Definitions.
 //
@@ -900,6 +908,7 @@
 def HasCmpxchg8b : Predicate<"Subtarget->hasCmpxchg8b()">;
 def HasCmpxchg16b: Predicate<"Subtarget->hasCmpxchg16b()">;
 def HasPCONFIG   : Predicate<"Subtarget->hasPCONFIG()">;
+def HasENQCMD    : Predicate<"Subtarget->hasENQCMD()">;
 def Not64BitMode : Predicate<"!Subtarget->is64Bit()">,
                              AssemblerPredicate<"!Mode64Bit", "Not 64-bit mode">;
 def In64BitMode  : Predicate<"Subtarget->is64Bit()">,
@@ -2755,6 +2764,37 @@
                    T8PD, AdSize64, Requires<[HasMOVDIR64B, In64BitMode]>;
 } // SchedRW
 
+//===----------------------------------------------------------------------===//
+// ENQCMD/S - Enqueue 64-byte command as user with 64-byte write atomicity
+//
+let SchedRW = [WriteStore], Defs = [EFLAGS] in {
+  def ENQCMD16 : I<0xF8, MRMSrcMem, (outs), (ins GR16:$dst, i512mem:$src),
+                 "enqcmd\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmd GR16:$dst, addr:$src))]>,
+                 T8XD, AdSize16, Requires<[HasENQCMD, Not64BitMode]>;
+  def ENQCMD32 : I<0xF8, MRMSrcMem, (outs), (ins GR32:$dst, i512mem:$src),
+                 "enqcmd\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmd GR32:$dst, addr:$src))]>,
+                 T8XD, AdSize32, Requires<[HasENQCMD]>;
+  def ENQCMD64 : I<0xF8, MRMSrcMem, (outs), (ins GR64:$dst, i512mem:$src),
+                 "enqcmd\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmd GR64:$dst, addr:$src))]>,
+                 T8XD, AdSize64, Requires<[HasENQCMD, In64BitMode]>;
+
+  def ENQCMDS16 : I<0xF8, MRMSrcMem, (outs), (ins GR16:$dst, i512mem:$src),
+                 "enqcmds\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmds GR16:$dst, addr:$src))]>,
+                 T8XS, AdSize16, Requires<[HasENQCMD, Not64BitMode]>;
+  def ENQCMDS32 : I<0xF8, MRMSrcMem, (outs), (ins GR32:$dst, i512mem:$src),
+                 "enqcmds\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmds GR32:$dst, addr:$src))]>,
+                 T8XS, AdSize32, Requires<[HasENQCMD]>;
+  def ENQCMDS64 : I<0xF8, MRMSrcMem, (outs), (ins GR64:$dst, i512mem:$src),
+                 "enqcmds\t{$src, $dst|$dst, $src}",
+                 [(set EFLAGS, (X86enqcmds GR64:$dst, addr:$src))]>,
+                 T8XS, AdSize64, Requires<[HasENQCMD, In64BitMode]>;
+}
+
 //===----------------------------------------------------------------------===//
 // CLZERO Instruction
 //
Index: lib/Target/X86/X86Subtarget.h
===================================================================
--- lib/Target/X86/X86Subtarget.h
+++ lib/Target/X86/X86Subtarget.h
@@ -356,6 +356,9 @@
   /// Processor has AVX-512 bfloat16 floating-point extensions
   bool HasBF16 = false;
 
+  /// Processor supports ENQCMD instructions
+  bool HasENQCMD = false;
+
   /// Processor has AVX-512 Bit Algorithms instructions
   bool HasBITALG = false;
 
@@ -688,6 +691,7 @@
   bool hasSGX() const { return HasSGX; }
   bool threewayBranchProfitable() const { return ThreewayBranchProfitable; }
   bool hasINVPCID() const { return HasINVPCID; }
+  bool hasENQCMD() const { return HasENQCMD; }
   bool useRetpolineIndirectCalls() const { return UseRetpolineIndirectCalls; }
   bool useRetpolineIndirectBranches() const {
     return UseRetpolineIndirectBranches;
Index: test/CodeGen/X86/enqcmd-intrinsics.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/enqcmd-intrinsics.ll
@@ -0,0 +1,57 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+enqcmd | FileCheck %s --check-prefix=X64
+; RUN: llc < %s -mtriple=i386-unknown-unknown -mattr=+enqcmd | FileCheck %s --check-prefix=X86
+; RUN: llc < %s -mtriple=x86_64-linux-gnux32 -mattr=+enqcmd | FileCheck %s --check-prefix=X32
+
+define i8 @test_enqcmd(i8* %dst, i8* %src) {
+entry:
+; X64-LABEL: test_enqcmd:
+; X64:       # %bb.0: # %entry
+; X64-NEXT:    enqcmd (%rsi), %rdi
+; X64-NEXT:    sete %al
+; X64-NEXT:    retq
+
+; X86-LABEL: test_enqcmd:
+; X86:       # %bb.0: # %entry
+; X86-NEXT:    movl {{[0-9+]}}(%esp), %eax
+; X86-NEXT:    movl {{[0-9+]}}(%esp), %ecx
+; X86-NEXT:    enqcmd (%eax), %ecx
+; X86-NEXT:    sete %al
+; X86-NEXT:    retl
+
+; X32-LABEL: test_enqcmd:
+; X32:       # %bb.0: # %entry
+; X32:         enqcmd (%esi), %edi
+; X32-NEXT:    sete %al
+; X32-NEXT:    retq
+  %0 = call i8 @llvm.x86.enqcmd(i8* %dst, i8* %src)
+  ret i8 %0
+}
+
+define i8 @test_enqcmds(i8* %dst, i8* %src) {
+entry:
+; X64-LABEL: test_enqcmds:
+; X64:       # %bb.0: # %entry
+; X64-NEXT:    enqcmds (%rsi), %rdi
+; X64-NEXT:    sete %al
+; X64-NEXT:    retq
+
+; X86-LABEL: test_enqcmds:
+; X86:       # %bb.0: # %entry
+; X86-NEXT:    movl {{[0-9+]}}(%esp), %eax
+; X86-NEXT:    movl {{[0-9+]}}(%esp), %ecx
+; X86-NEXT:    enqcmds (%eax), %ecx
+; X86-NEXT:    sete %al
+; X86-NEXT:    retl
+
+; X32-LABEL: test_enqcmds:
+; X32:       # %bb.0: # %entry
+; X32:         enqcmds (%esi), %edi
+; X32-NEXT:    sete %al
+; X32-NEXT:    retq
+  %0 = call i8 @llvm.x86.enqcmds(i8* %dst, i8* %src)
+  ret i8 %0
+}
+
+declare i8 @llvm.x86.enqcmd(i8*, i8*)
+declare i8 @llvm.x86.enqcmds(i8*, i8*)
Index: test/MC/Disassembler/X86/x86-16.txt
===================================================================
--- test/MC/Disassembler/X86/x86-16.txt
+++ test/MC/Disassembler/X86/x86-16.txt
@@ -806,3 +806,33 @@
 
 #CHECK: movdir64b (%si), %ax
 0x66 0x0f 0x38 0xf8 0x04
+
+# CHECK: enqcmd (%bx), %di
+0xf2,0x0f,0x38,0xf8,0x3f
+
+# CHECK: enqcmd 8128(%si), %ax
+0xf2,0x0f,0x38,0xf8,0x84,0xc0,0x1f
+
+# CHECK: enqcmd -8192(%di), %bx
+0xf2,0x0f,0x38,0xf8,0x9d,0x00,0xe0
+
+# CHECK: enqcmd 7408, %cx
+0xf2,0x0f,0x38,0xf8,0x0e,0xf0,0x1c
+
+# CHECK: enqcmds (%bx), %di
+0xf3,0x0f,0x38,0xf8,0x3f
+
+# CHECK: enqcmds 8128(%si), %ax
+0xf3,0x0f,0x38,0xf8,0x84,0xc0,0x1f
+
+# CHECK: enqcmds -8192(%di), %bx
+0xf3,0x0f,0x38,0xf8,0x9d,0x00,0xe0
+
+# CHECK: enqcmds 7408, %cx
+0xf3,0x0f,0x38,0xf8,0x0e,0xf0,0x1c
+
+# CHECK: enqcmd (%edi), %edi
+0x67,0xf2,0x0f,0x38,0xf8,0x3f
+
+# CHECK: enqcmds (%edi), %edi
+0x67,0xf3,0x0f,0x38,0xf8,0x3f
Index: test/MC/Disassembler/X86/x86-32.txt
===================================================================
--- test/MC/Disassembler/X86/x86-32.txt
+++ test/MC/Disassembler/X86/x86-32.txt
@@ -901,3 +901,45 @@
 
 # CHECK: addb $0, 305419896(,%eiz)
 0x80 0x04 0x25 0x78 0x56 0x34 0x12 0x00
+
+# CHECK: enqcmd 268435456(%ebp,%eax,8), %esi
+0xf2,0x0f,0x38,0xf8,0xb4,0xc5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmd (%ecx), %edi
+0xf2,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmd 8128(%ecx), %eax
+0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmd -8192(%edx), %ebx
+0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmd 485498096, %eax
+0xf2,0x0f,0x38,0xf8,0x05,0xf0,0x1c,0xf0,0x1c
+
+# CHECK: enqcmds 268435456(%ebp,%eax,8), %esi
+0xf3,0x0f,0x38,0xf8,0xb4,0xc5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmds (%ecx), %edi
+0xf3,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmds 8128(%ecx), %eax
+0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmds -8192(%edx), %ebx
+0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmds 485498096, %eax
+0xf3,0x0f,0x38,0xf8,0x05,0xf0,0x1c,0xf0,0x1c
+
+# CHECK: enqcmd (%bx,%di), %di
+0x67,0xf2,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmd 8128(%bx,%di), %ax
+0x67,0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f
+
+# CHECK: enqcmds (%bx,%di), %di
+0x67,0xf3,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmds 8128(%bx,%di), %ax
+0x67,0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f
Index: test/MC/Disassembler/X86/x86-64.txt
===================================================================
--- test/MC/Disassembler/X86/x86-64.txt
+++ test/MC/Disassembler/X86/x86-64.txt
@@ -631,3 +631,63 @@
 0x63 0x08
 # CHECK: movslq (%rax), %cx
 0x66 0x63 0x08
+
+# CHECK: enqcmd 485498096, %eax
+0x67,0xf2,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c
+
+# CHECK: enqcmd  268435456(%ebp,%r14d,8), %esi
+0x67,0xf2,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmd  (%r9d), %edi
+0x67,0xf2,0x41,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmd  8128(%ecx), %eax
+0x67,0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmd  -8192(%edx), %ebx
+0x67,0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmds 268435456(%ebp,%r14d,8), %esi
+0x67,0xf3,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmds (%r9d), %edi
+0x67,0xf3,0x41,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmds 8128(%ecx), %eax
+0x67,0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmds -8192(%edx), %ebx
+0x67,0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmds 485498096, %eax
+0x67,0xf3,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c
+
+# CHECK: enqcmd  268435456(%rbp,%r14,8), %rsi
+0xf2,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmd  (%r9), %rdi
+0xf2,0x41,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmd  8128(%rcx), %rax
+0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmd  -8192(%rdx), %rbx
+0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmd 485498096, %rax
+0xf2,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c
+
+# CHECK: enqcmds 268435456(%rbp,%r14,8), %rsi
+0xf3,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10
+
+# CHECK: enqcmds (%r9), %rdi
+0xf3,0x41,0x0f,0x38,0xf8,0x39
+
+# CHECK: enqcmds 8128(%rcx), %rax
+0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00
+
+# CHECK: enqcmds -8192(%rdx), %rbx
+0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff
+
+# CHECK: enqcmds 485498096, %rax
+0xf3,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c
Index: test/MC/X86/x86-16.s
===================================================================
--- test/MC/X86/x86-16.s
+++ test/MC/X86/x86-16.s
@@ -989,3 +989,43 @@
 // CHECK: movdir64b (%si), %ax
 // CHECK: encoding: [0x66,0x0f,0x38,0xf8,0x04]
 movdir64b (%si), %ax
+
+// CHECK: enqcmd (%bx), %di
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x3f]
+enqcmd  (%bx), %di
+
+// CHECK: enqcmd 8128(%si), %ax
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x84,0xc0,0x1f]
+enqcmd  8128(%si), %ax
+
+// CHECK: enqcmd -8192(%di), %bx
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x9d,0x00,0xe0]
+enqcmd  -8192(%di), %bx
+
+// CHECK: enqcmd 7408, %cx
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x0e,0xf0,0x1c]
+enqcmd  7408, %cx
+
+// CHECK: enqcmds (%bx), %di
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x3f]
+enqcmds (%bx), %di
+
+// CHECK: enqcmds 8128(%si), %ax
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x84,0xc0,0x1f]
+enqcmds 8128(%si), %ax
+
+// CHECK: enqcmds -8192(%di), %bx
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x9d,0x00,0xe0]
+enqcmds -8192(%di), %bx
+
+// CHECK: enqcmds 7408, %cx
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x0e,0xf0,0x1c]
+enqcmds  7408, %cx
+
+// CHECK: enqcmd (%edi), %edi
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x3f]
+enqcmd  (%edi), %edi
+
+// CHECK: enqcmds (%edi), %edi
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x3f]
+enqcmds (%edi), %edi
Index: test/MC/X86/x86-32-coverage.s
===================================================================
--- test/MC/X86/x86-32-coverage.s
+++ test/MC/X86/x86-32-coverage.s
@@ -10816,3 +10816,59 @@
 // CHECK: aad # encoding: [0xd5,0x0a]
 // INTEL: aad{{$}}
 aad $10
+
+// CHECK: enqcmd 268435456(%ebp,%eax,8), %esi
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0xb4,0xc5,0x00,0x00,0x00,0x10]
+enqcmd  0x10000000(%ebp, %eax, 8), %esi
+
+// CHECK: enqcmd (%ecx), %edi
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x39]
+enqcmd  (%ecx), %edi
+
+// CHECK: enqcmd 8128(%ecx), %eax
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmd  8128(%ecx), %eax
+
+// CHECK: enqcmd -8192(%edx), %ebx
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmd  -8192(%edx), %ebx
+
+// CHECK: enqcmd 485498096, %eax
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x05,0xf0,0x1c,0xf0,0x1c]
+enqcmd 485498096, %eax
+
+// CHECK: enqcmds 268435456(%ebp,%eax,8), %esi
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0xb4,0xc5,0x00,0x00,0x00,0x10]
+enqcmds 0x10000000(%ebp, %eax, 8), %esi
+
+// CHECK: enqcmds (%ecx), %edi
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x39]
+enqcmds (%ecx), %edi
+
+// CHECK: enqcmds 8128(%ecx), %eax
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmds 8128(%ecx), %eax
+
+// CHECK: enqcmds -8192(%edx), %ebx
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmds -8192(%edx), %ebx
+
+// CHECK: enqcmds 485498096, %eax
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x05,0xf0,0x1c,0xf0,0x1c]
+enqcmds 485498096, %eax
+
+// CHECK: enqcmd (%bx,%di), %di
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x39]
+enqcmd  (%bx,%di), %di
+
+// CHECK: enqcmd 8128(%bx,%di), %ax
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f]
+enqcmd  8128(%bx,%di), %ax
+
+// CHECK: enqcmds (%bx,%di), %di
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x39]
+enqcmds (%bx,%di), %di
+
+// CHECK: enqcmds 8128(%bx,%di), %ax
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f]
+enqcmds 8128(%bx,%di), %ax
Index: test/MC/X86/x86-64.s
===================================================================
--- test/MC/X86/x86-64.s
+++ test/MC/X86/x86-64.s
@@ -1797,3 +1797,83 @@
 // CHECK: lock
 // This line has to be the last one in the file
 lock
+
+// CHECK: enqcmd 268435456(%ebp,%r14d,8), %esi
+// CHECK: encoding: [0x67,0xf2,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10]
+enqcmd  0x10000000(%ebp, %r14d, 8), %esi
+
+// CHECK: enqcmd (%r9d), %edi
+// CHECK: encoding: [0x67,0xf2,0x41,0x0f,0x38,0xf8,0x39]
+enqcmd  (%r9d), %edi
+
+// CHECK: enqcmd 8128(%ecx), %eax
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmd  8128(%ecx), %eax
+
+// CHECK: enqcmd -8192(%edx), %ebx
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmd  -8192(%edx), %ebx
+
+// CHECK: enqcmd 485498096, %eax
+// CHECK: encoding: [0x67,0xf2,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c]
+enqcmd 485498096, %eax
+
+// CHECK: enqcmds 268435456(%ebp,%r14d,8), %esi
+// CHECK: encoding: [0x67,0xf3,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10]
+enqcmds 0x10000000(%ebp, %r14d, 8), %esi
+
+// CHECK: enqcmds (%r9d), %edi
+// CHECK: encoding: [0x67,0xf3,0x41,0x0f,0x38,0xf8,0x39]
+enqcmds (%r9d), %edi
+
+// CHECK: enqcmds 8128(%ecx), %eax
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmds 8128(%ecx), %eax
+
+// CHECK: enqcmds -8192(%edx), %ebx
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmds -8192(%edx), %ebx
+
+// CHECK: enqcmds 485498096, %eax
+// CHECK: encoding: [0x67,0xf3,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c]
+enqcmds 485498096, %eax
+
+// CHECK: enqcmd 268435456(%rbp,%r14,8), %rsi
+// CHECK: encoding: [0xf2,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10]
+enqcmd  0x10000000(%rbp, %r14, 8), %rsi
+
+// CHECK: enqcmd (%r9), %rdi
+// CHECK: encoding: [0xf2,0x41,0x0f,0x38,0xf8,0x39]
+enqcmd  (%r9), %rdi
+
+// CHECK: enqcmd 8128(%rcx), %rax
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmd  8128(%rcx), %rax
+
+// CHECK: enqcmd -8192(%rdx), %rbx
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmd  -8192(%rdx), %rbx
+
+// CHECK: enqcmd 485498096, %rax
+// CHECK: encoding: [0xf2,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c]
+enqcmd 485498096, %rax
+
+// CHECK: enqcmds 268435456(%rbp,%r14,8), %rsi
+// CHECK: encoding: [0xf3,0x42,0x0f,0x38,0xf8,0xb4,0xf5,0x00,0x00,0x00,0x10]
+enqcmds 0x10000000(%rbp, %r14, 8), %rsi
+
+// CHECK: enqcmds (%r9), %rdi
+// CHECK: encoding: [0xf3,0x41,0x0f,0x38,0xf8,0x39]
+enqcmds (%r9), %rdi
+
+// CHECK: enqcmds 8128(%rcx), %rax
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x81,0xc0,0x1f,0x00,0x00]
+enqcmds 8128(%rcx), %rax
+
+// CHECK: enqcmds -8192(%rdx), %rbx
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x9a,0x00,0xe0,0xff,0xff]
+enqcmds -8192(%rdx), %rbx
+
+// CHECK: enqcmds 485498096, %rax
+// CHECK: encoding: [0xf3,0x0f,0x38,0xf8,0x04,0x25,0xf0,0x1c,0xf0,0x1c]
+enqcmds 485498096, %rax