diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -592,6 +592,9 @@
 - Fix 32-bit ``__fastcall`` and ``__vectorcall`` ABI mismatch with MSVC.
 - Switch ``AVX512-BF16`` intrinsics types from ``short`` to ``__bf16``.
 - Add support for ``PREFETCHI`` instructions.
+- Support ISA of ``CMPCCXADD``.
+  * Support intrinsic of ``__cmpccxadd_epi32``.
+  * Support intrinsic of ``__cmpccxadd_epi64``.
 
 DWARF Support in Clang
 ----------------------
diff --git a/clang/include/clang/Basic/BuiltinsX86_64.def b/clang/include/clang/Basic/BuiltinsX86_64.def
--- a/clang/include/clang/Basic/BuiltinsX86_64.def
+++ b/clang/include/clang/Basic/BuiltinsX86_64.def
@@ -134,6 +134,8 @@
 TARGET_BUILTIN(__builtin_ia32_ptwrite64, "vUOi", "n", "ptwrite")
 
 TARGET_BUILTIN(__builtin_ia32_prefetchi, "vvC*Ui", "nc", "prefetchi")
+TARGET_BUILTIN(__builtin_ia32_cmpccxadd32, "Siv*SiSiIi", "n", "cmpccxadd")
+TARGET_BUILTIN(__builtin_ia32_cmpccxadd64, "SLLiv*SLLiSLLiIi", "n", "cmpccxadd")
 
 #undef BUILTIN
 #undef TARGET_BUILTIN
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4526,6 +4526,8 @@
 def mno_amx_int8 : Flag<["-"], "mno-amx-int8">, Group<m_x86_Features_Group>;
 def mamx_tile : Flag<["-"], "mamx-tile">, Group<m_x86_Features_Group>;
 def mno_amx_tile : Flag<["-"], "mno-amx-tile">, Group<m_x86_Features_Group>;
+def mcmpccxadd : Flag<["-"], "mcmpccxadd">, Group<m_x86_Features_Group>;
+def mno_cmpccxadd : Flag<["-"], "mno-cmpccxadd">, Group<m_x86_Features_Group>;
 def msse : Flag<["-"], "msse">, Group<m_x86_Features_Group>;
 def mno_sse : Flag<["-"], "mno-sse">, Group<m_x86_Features_Group>;
 def msse2 : Flag<["-"], "msse2">, Group<m_x86_Features_Group>;
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -137,6 +137,7 @@
   bool HasPTWRITE = false;
   bool HasINVPCID = false;
   bool HasENQCMD = false;
+  bool HasCMPCCXADD = false;
   bool HasKL = false;      // For key locker
   bool HasWIDEKL = false; // For wide key locker
   bool HasHRESET = false;
diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -332,6 +332,8 @@
       HasAMXINT8 = true;
     } else if (Feature == "+amx-tile") {
       HasAMXTILE = true;
+    } else if (Feature == "+cmpccxadd") {
+      HasCMPCCXADD = true;
     } else if (Feature == "+avxvnni") {
       HasAVXVNNI = true;
     } else if (Feature == "+serialize") {
@@ -778,6 +780,8 @@
     Builder.defineMacro("__AMXINT8__");
   if (HasAMXBF16)
     Builder.defineMacro("__AMXBF16__");
+  if (HasCMPCCXADD)
+    Builder.defineMacro("__CMPCCXADD__");
   if (HasAVXVNNI)
     Builder.defineMacro("__AVXVNNI__");
   if (HasSERIALIZE)
@@ -908,6 +912,7 @@
       .Case("clflushopt", true)
       .Case("clwb", true)
       .Case("clzero", true)
+      .Case("cmpccxadd", true)
       .Case("crc32", true)
       .Case("cx16", true)
       .Case("enqcmd", true)
@@ -1004,6 +1009,7 @@
       .Case("clwb", HasCLWB)
       .Case("clzero", HasCLZERO)
       .Case("crc32", HasCRC32)
+      .Case("cmpccxadd", HasCMPCCXADD)
       .Case("cx8", HasCX8)
       .Case("cx16", HasCX16)
       .Case("enqcmd", HasENQCMD)
diff --git a/clang/lib/Headers/CMakeLists.txt b/clang/lib/Headers/CMakeLists.txt
--- a/clang/lib/Headers/CMakeLists.txt
+++ b/clang/lib/Headers/CMakeLists.txt
@@ -150,6 +150,7 @@
   clflushoptintrin.h
   clwbintrin.h
   clzerointrin.h
+  cmpccxaddintrin.h
   crc32intrin.h
   emmintrin.h
   enqcmdintrin.h
diff --git a/clang/lib/Headers/cmpccxaddintrin.h b/clang/lib/Headers/cmpccxaddintrin.h
new file mode 100644
--- /dev/null
+++ b/clang/lib/Headers/cmpccxaddintrin.h
@@ -0,0 +1,69 @@
+/*===--------------- cmpccxaddintrin.h - CMPCCXADD intrinsics--------------===
+ *
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ *===-----------------------------------------------------------------------===
+ */
+#ifndef __IMMINTRIN_H
+#error "Never use <cmpccxaddintrin.h> directly; include <immintrin.h> instead."
+#endif // __IMMINTRIN_H
+
+#ifndef __CMPCCXADDINTRIN_H
+#define __CMPCCXADDINTRIN_H
+#ifdef __x86_64__
+
+typedef enum {
+  _CMPCCX_O,   /* Overflow.  */
+  _CMPCCX_NO,  /* No overflow.  */
+  _CMPCCX_B,   /* Below.  */
+  _CMPCCX_NB,  /* Not below.  */
+  _CMPCCX_Z,   /* Zero.  */
+  _CMPCCX_NZ,  /* Not zero.  */
+  _CMPCCX_BE,  /* Below or equal.  */
+  _CMPCCX_NBE, /* Neither below nor equal.  */
+  _CMPCCX_S,   /* Sign.  */
+  _CMPCCX_NS,  /* No sign.  */
+  _CMPCCX_P,   /* Parity.  */
+  _CMPCCX_NP,  /* No parity.  */
+  _CMPCCX_L,   /* Less.  */
+  _CMPCCX_NL,  /* Not less.  */
+  _CMPCCX_LE,  /* Less or equal.  */
+  _CMPCCX_NLE, /* Neither less nor equal.  */
+} _CMPCCX_ENUM;
+
+/// Compares the value from the memory __A with the value of __B. If the
+/// specified condition __D is met, then add the third operand __C to the
+/// __A and write it into __A, else the value of __A is unchanged. The return
+/// value is the original value of __A.
+///
+/// \headerfile <immintrin.h>
+///
+/// This intrinsic corresponds to the \c CMPCCXADD instructions.
+///
+/// \param __A
+///    __A pointer specifying the memory address.
+///
+/// \param __B
+///   A integer operand.
+///
+/// \param __C
+///   A integer operand.
+///
+/// \param __D
+///   The specified condition.
+///
+/// \returns a integer which is the original value of first operand.
+
+#define __cmpccxadd_epi32(__A, __B, __C, __D)                                  \
+  ((int)(__builtin_ia32_cmpccxadd32((void *)(__A), (int)(__B), (int)(__C),     \
+                                    (int)(__D))))
+
+#define __cmpccxadd_epi64(__A, __B, __C, __D)                                  \
+  ((long long)(__builtin_ia32_cmpccxadd64((void *)(__A), (long long)(__B),     \
+                                          (long long)(__C), (int)(__D))))
+
+#endif // __x86_64__
+#endif // __CMPCCXADDINTRIN_H
diff --git a/clang/lib/Headers/cpuid.h b/clang/lib/Headers/cpuid.h
--- a/clang/lib/Headers/cpuid.h
+++ b/clang/lib/Headers/cpuid.h
@@ -202,6 +202,7 @@
 /* Features in %eax for leaf 7 sub-leaf 1 */
 #define bit_AVXVNNI       0x00000010
 #define bit_AVX512BF16    0x00000020
+#define bit_CMPCCXADD     0x00000080
 #define bit_HRESET        0x00400000
 
 /* Features in %edx for leaf 7 sub-leaf 1 */
diff --git a/clang/lib/Headers/immintrin.h b/clang/lib/Headers/immintrin.h
--- a/clang/lib/Headers/immintrin.h
+++ b/clang/lib/Headers/immintrin.h
@@ -509,6 +509,11 @@
 #include <invpcidintrin.h>
 #endif
 
+#if !(defined(_MSC_VER) || defined(__SCE__)) || __has_feature(modules) ||      \
+    defined(__CMPCCXADD__)
+#include <cmpccxaddintrin.h>
+#endif
+
 #if !(defined(_MSC_VER) || defined(__SCE__)) || __has_feature(modules) ||      \
     defined(__KL__) || defined(__WIDEKL__)
 #include <keylockerintrin.h>
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -5410,6 +5410,10 @@
   case X86::BI__builtin_ia32_reducesh_mask:
     i = 4; l = 0; u = 255;
     break;
+  case X86::BI__builtin_ia32_cmpccxadd32:
+  case X86::BI__builtin_ia32_cmpccxadd64:
+    i = 3; l = 0; u = 15;
+    break;
   }
 
   // Note that we don't force a hard error on the range check here, allowing
diff --git a/clang/test/CodeGen/X86/cmpccxadd-builtins-error-32.c b/clang/test/CodeGen/X86/cmpccxadd-builtins-error-32.c
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/X86/cmpccxadd-builtins-error-32.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 %s -ffreestanding -triple=i386-unknown-unknown \
+// RUN: -target-feature +cmpccxadd  -emit-llvm -fsyntax-only -verify
+
+#include <immintrin.h>
+
+int test_cmpccxadd32(void *__A, int __B, int __C) {
+  return __cmpccxadd_epi32(__A, __B, __C, 0); // expected-error {{call to undeclared function '__cmpccxadd_epi32'}}
+}
diff --git a/clang/test/CodeGen/X86/cmpccxadd-builtins-error.c b/clang/test/CodeGen/X86/cmpccxadd-builtins-error.c
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/X86/cmpccxadd-builtins-error.c
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 %s -ffreestanding -triple=x86_64-unknown-unknown \
+// RUN: -target-feature +cmpccxadd  -emit-llvm -fsyntax-only -verify
+
+#include <immintrin.h>
+
+int test_cmpccxadd32(void *__A, int __B, int __C) {
+  return __cmpccxadd_epi32(__A, __B, __C, 16); // expected-error {{argument value 16 is outside the valid range [0, 15]}}
+}
+
+long long test_cmpccxadd64(void *__A, long long __B, long long __C) {
+  return __cmpccxadd_epi64(__A, __B, __C, 16); // expected-error {{argument value 16 is outside the valid range [0, 15]}}
+}
diff --git a/clang/test/CodeGen/X86/cmpccxadd-builtins.c b/clang/test/CodeGen/X86/cmpccxadd-builtins.c
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/X86/cmpccxadd-builtins.c
@@ -0,0 +1,197 @@
+// RUN: %clang_cc1 %s -ffreestanding -triple=x86_64-unknown-unknown -target-feature +cmpccxadd \
+// RUN: -emit-llvm -o - -Wall -Werror -pedantic -Wno-gnu-statement-expression | FileCheck %s
+
+#include <immintrin.h>
+#include <stddef.h>
+
+int test_cmpbexadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpbexadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 0)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_O);
+}
+
+long long test_cmpbexadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpbexadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 0)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_O);
+}
+
+int test_cmpbxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpbxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 1)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NO);
+}
+
+long long test_cmpbxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpbxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 1)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NO);
+}
+
+int test_cmplexadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmplexadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 2)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_B);
+}
+
+long long test_cmplexadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmplexadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 2)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_B);
+}
+
+int test_cmplxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmplxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 3)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NB);
+}
+
+long long test_cmplxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmplxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 3)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NB);
+}
+
+int test_cmpnbexadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnbexadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 4)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_Z);
+}
+
+long long test_cmpnbexadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnbexadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 4)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_Z);
+}
+
+int test_cmpnbxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnbxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 5)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NZ);
+}
+
+long long test_cmpnbxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnbxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 5)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NZ);
+}
+
+int test_cmpnlexadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnlexadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 6)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_BE);
+}
+
+long long test_cmpnlexadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnlexadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 6)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_BE);
+}
+
+int test_cmpnlxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnlxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 7)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NBE);
+}
+
+long long test_cmpnlxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnlxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 7)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NBE);
+}
+
+int test_cmpnoxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnoxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 8)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_S);
+}
+
+long long test_cmpnoxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnoxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 8)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_S);
+}
+
+int test_cmpnpxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnpxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 9)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NS);
+}
+
+long long test_cmpnpxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnpxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 9)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NS);
+}
+
+int test_cmpnsxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnsxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 10)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_P);
+}
+
+long long test_cmpnsxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnsxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 10)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_P);
+}
+
+int test_cmpnzxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpnzxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 11)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NP);
+}
+
+long long test_cmpnzxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpnzxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 11)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NP);
+}
+
+int test_cmpoxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpoxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 12)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_L);
+}
+
+long long test_cmpoxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpoxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 12)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_L);
+}
+
+int test_cmppxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmppxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 13)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NL);
+}
+
+long long test_cmppxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmppxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 13)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NL);
+}
+
+int test_cmpsxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpsxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 14)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_LE);
+}
+
+long long test_cmpsxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpsxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 14)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_LE);
+}
+
+int test_cmpzxadd32(void *__A, int __B, int __C) {
+  // CHECK-LABEL: @test_cmpzxadd32(
+  // CHECK: call i32 @llvm.x86.cmpccxadd32(ptr %{{.*}}, i32 %{{.*}}, i32 %{{.*}}, i32 15)
+  return __cmpccxadd_epi32(__A, __B, __C, _CMPCCX_NLE);
+}
+
+long long test_cmpzxadd64(void *__A, long long __B, long long __C) {
+  // CHECK-LABEL: @test_cmpzxadd64(
+  // CHECK: call i64 @llvm.x86.cmpccxadd64(ptr %{{.*}}, i64 %{{.*}}, i64 %{{.*}}, i32 15)
+  return __cmpccxadd_epi64(__A, __B, __C, _CMPCCX_NLE);
+}
diff --git a/clang/test/Driver/x86-target-features.c b/clang/test/Driver/x86-target-features.c
--- a/clang/test/Driver/x86-target-features.c
+++ b/clang/test/Driver/x86-target-features.c
@@ -310,6 +310,11 @@
 // AVX512FP16: "-target-feature" "+avx512fp16"
 // NO-AVX512FP16: "-target-feature" "-avx512fp16"
 
+// RUN: %clang -target i686-unknown-linux-gnu -mcmpccxadd %s -### -o %t.o 2>&1 | FileCheck -check-prefix=CMPCCXADD %s
+// RUN: %clang -target i686-unknown-linux-gnu -mno-cmpccxadd %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-CMPCCXADD %s
+// CMPCCXADD: "-target-feature" "+cmpccxadd"
+// NO-CMPCCXADD: "-target-feature" "-cmpccxadd"
+
 // RUN: %clang --target=i386 -march=i386 -mcrc32 %s -### 2>&1 | FileCheck -check-prefix=CRC32 %s
 // RUN: %clang --target=i386 -march=i386 -mno-crc32 %s -### 2>&1 | FileCheck -check-prefix=NO-CRC32 %s
 // CRC32: "-target-feature" "+crc32"
diff --git a/clang/test/Preprocessor/x86_target_features.c b/clang/test/Preprocessor/x86_target_features.c
--- a/clang/test/Preprocessor/x86_target_features.c
+++ b/clang/test/Preprocessor/x86_target_features.c
@@ -581,6 +581,14 @@
 // AVX512FP16NOAVX512DQ-NOT: #define __AVX512DQ__ 1
 // AVX512FP16NOAVX512DQ-NOT: #define __AVX512FP16__ 1
 
+// RUN: %clang -target x86_64-unknown-linux-gnu -march=atom -mcmpccxadd -x c -E -dM -o - %s | FileCheck  -check-prefix=CMPCCXADD %s
+
+// CMPCCXADD: #define __CMPCCXADD__ 1
+
+// RUN: %clang -target x86_64-unknown-linux-gnu -march=atom -mno-cmpccxadd -x c -E -dM -o - %s | FileCheck  -check-prefix=NO-CMPCCXADD %s
+
+// NO-CMPCCXADD-NOT: #define __CMPCCXADD__ 1
+
 // RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mcrc32 -x c -E -dM -o - %s | FileCheck -check-prefix=CRC32 %s
 
 // CRC32: #define __CRC32__ 1
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -138,6 +138,7 @@
 
 * Add support for the ``RDMSRLIST and WRMSRLIST`` instructions.
 * Add support for the ``WRMSRNS`` instruction.
+* Support ISA of ``CMPCCXADD``.
 
 Changes to the OCaml bindings
 -----------------------------
diff --git a/llvm/include/llvm/IR/IntrinsicsX86.td b/llvm/include/llvm/IR/IntrinsicsX86.td
--- a/llvm/include/llvm/IR/IntrinsicsX86.td
+++ b/llvm/include/llvm/IR/IntrinsicsX86.td
@@ -5115,6 +5115,19 @@
               Intrinsic<[llvm_anyvector_ty], [llvm_x86amx_ty], [IntrNoMem]>;
 }
 
+let TargetPrefix = "x86" in {
+def int_x86_cmpccxadd32
+    : ClangBuiltin<"__builtin_ia32_cmpccxadd32">,
+      Intrinsic<[llvm_i32_ty],
+                [llvm_ptr_ty, llvm_i32_ty, llvm_i32_ty, llvm_i32_ty],
+                [IntrArgMemOnly, ImmArg<ArgIndex<3>>]>;
+
+def int_x86_cmpccxadd64
+    : ClangBuiltin<"__builtin_ia32_cmpccxadd64">,
+      Intrinsic<[llvm_i64_ty],
+                [llvm_ptr_ty, llvm_i64_ty, llvm_i64_ty, llvm_i32_ty],
+                [IntrArgMemOnly, ImmArg<ArgIndex<3>>]>;
+}
 //===----------------------------------------------------------------------===//
 // UINTR - User Level Interrupt
 
diff --git a/llvm/include/llvm/Support/X86TargetParser.def b/llvm/include/llvm/Support/X86TargetParser.def
--- a/llvm/include/llvm/Support/X86TargetParser.def
+++ b/llvm/include/llvm/Support/X86TargetParser.def
@@ -202,6 +202,7 @@
 X86_FEATURE       (XSAVES,          "xsaves")
 X86_FEATURE       (HRESET,          "hreset")
 X86_FEATURE       (AVX512FP16,      "avx512fp16")
+X86_FEATURE       (CMPCCXADD,       "cmpccxadd")
 X86_FEATURE       (AVXVNNI,         "avxvnni")
 // These features aren't really CPU features, but the frontend can set them.
 X86_FEATURE       (RETPOLINE_EXTERNAL_THUNK,    "retpoline-external-thunk")
diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -1807,6 +1807,7 @@
       MaxLevel >= 7 && !getX86CpuIDAndInfoEx(0x7, 0x1, &EAX, &EBX, &ECX, &EDX);
   Features["avxvnni"]    = HasLeaf7Subleaf1 && ((EAX >> 4) & 1) && HasAVXSave;
   Features["avx512bf16"] = HasLeaf7Subleaf1 && ((EAX >> 5) & 1) && HasAVX512Save;
+  Features["cmpccxadd"]  = HasLeaf7Subleaf1 && ((EAX >> 7) & 1);
   Features["hreset"]     = HasLeaf7Subleaf1 && ((EAX >> 22) & 1);
   Features["prefetchi"]  = HasLeaf7Subleaf1 && ((EDX >> 14) & 1);
 
diff --git a/llvm/lib/Support/X86TargetParser.cpp b/llvm/lib/Support/X86TargetParser.cpp
--- a/llvm/lib/Support/X86TargetParser.cpp
+++ b/llvm/lib/Support/X86TargetParser.cpp
@@ -582,6 +582,7 @@
 constexpr FeatureBitset ImpliedFeaturesHRESET = {};
 
 constexpr FeatureBitset ImpliedFeaturesPREFETCHI = {};
+constexpr FeatureBitset ImpliedFeaturesCMPCCXADD = {};
 constexpr FeatureBitset ImpliedFeaturesAVX512FP16 =
     FeatureAVX512BW | FeatureAVX512DQ | FeatureAVX512VL;
 // Key Locker Features
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h b/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
--- a/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
@@ -630,6 +630,11 @@
     /// byte like data16 or rep.
     PrefixByte = 10,
 
+    /// MRMDestMem4VOp3CC - This form is used for instructions that use the Mod/RM
+    /// byte to specify a destination which in this case is memory and operand 3
+    /// with VEX.VVVV, and also encodes a condition code.
+    MRMDestMem4VOp3CC = 20,
+
     /// MRM[0-7][rm] - These forms are used to represent instructions that use
     /// a Mod/RM byte, and use the middle field to hold extended opcode
     /// information.  In the intel manual these are represented as /0, /1, ...
@@ -1065,7 +1070,7 @@
         return 1;
       // Check for AVX-512 scatter which has a TIED_TO in the second to last
       // operand.
-      if (NumOps == 8 &&
+      if ((NumOps == 8) &&
           Desc.getOperandConstraint(6, MCOI::TIED_TO) == 0)
         return 1;
       return 0;
@@ -1119,6 +1124,7 @@
       // mask register.
       return 1 + HasVEX_4V + HasEVEX_K;
     case X86II::MRMSrcMem4VOp3:
+    case X86II::MRMDestMem4VOp3CC:
       // Skip registers encoded in reg.
       return 1 + HasEVEX_K;
     case X86II::MRMSrcMemOp4:
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
--- a/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
@@ -801,6 +801,25 @@
   switch (TSFlags & X86II::FormMask) {
   default:
     llvm_unreachable("Unexpected form in emitVEXOpcodePrefix!");
+  case X86II::MRMDestMem4VOp3CC: {
+    //  MemAddr, src1(ModR/M), src2(VEX_4V)
+    unsigned BaseRegEnc = getX86RegEncoding(MI, MemOperand + X86::AddrBaseReg);
+    VEX_B = ~(BaseRegEnc >> 3) & 1;
+    unsigned IndexRegEnc =
+        getX86RegEncoding(MI, MemOperand + X86::AddrIndexReg);
+    VEX_X = ~(IndexRegEnc >> 3) & 1;
+
+    CurOp += X86::AddrNumOperands;
+
+    unsigned RegEnc = getX86RegEncoding(MI, ++CurOp);
+    VEX_R = ~(RegEnc >> 3) & 1;
+    EVEX_R2 = ~(RegEnc >> 4) & 1;
+
+    unsigned VRegEnc = getX86RegEncoding(MI, CurOp++);
+    VEX_4V = ~VRegEnc & 0xf;
+    EVEX_V2 = ~(VRegEnc >> 4) & 1;
+    break;
+  }
   case X86II::MRM_C0:
   case X86II::RawFrm:
   case X86II::PrefixByte:
@@ -1429,6 +1448,15 @@
     CurOp = SrcRegNum + 1;
     break;
   }
+  case X86II::MRMDestMem4VOp3CC: {
+    unsigned CC = MI.getOperand(8).getImm();
+    emitByte(BaseOpcode + CC, OS);
+    unsigned SrcRegNum = CurOp + X86::AddrNumOperands;
+    emitMemModRMByte(MI, CurOp + 1, getX86RegNum(MI.getOperand(0)), TSFlags,
+                     HasREX, StartByte, OS, Fixups, STI, false);
+    CurOp = SrcRegNum + 3; // skip VEX_V4 and CC
+    break;
+  }
   case X86II::MRMDestMemFSIB:
   case X86II::MRMDestMem: {
     emitByte(BaseOpcode, OS);
diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td
--- a/llvm/lib/Target/X86/X86.td
+++ b/llvm/lib/Target/X86/X86.td
@@ -257,6 +257,8 @@
 def FeatureAMXBF16     : SubtargetFeature<"amx-bf16", "HasAMXBF16", "true",
                                       "Support AMX-BF16 instructions",
                                       [FeatureAMXTILE]>;
+def FeatureCMPCCXADD : SubtargetFeature<"cmpccxadd", "HasCMPCCXADD", "true",
+                                        "Support CMPCCXADD instructions">;
 def FeatureINVPCID : SubtargetFeature<"invpcid", "HasINVPCID", "true",
                                       "Invalidate Process-Context Identifier">;
 def FeatureSGX     : SubtargetFeature<"sgx", "HasSGX", "true",
diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -869,6 +869,9 @@
     AESENCWIDE256KL,
     AESDECWIDE256KL,
 
+    CMPCCXADD32,
+    CMPCCXADD64,
+
     // Save xmm argument registers to the stack, according to %al. An operator
     // is needed so that this can be expanded with control flow.
     VASTART_SAVE_XMM_REGS,
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -5628,6 +5628,8 @@
       Info.align = Align(1);
       Info.flags |= MachineMemOperand::MOLoad;
       return true;
+    case Intrinsic::x86_cmpccxadd32:
+    case Intrinsic::x86_cmpccxadd64:
     case Intrinsic::x86_atomic_bts:
     case Intrinsic::x86_atomic_btc:
     case Intrinsic::x86_atomic_btr: {
@@ -28234,6 +28236,20 @@
                           DAG.getShiftAmountConstant(Imm, VT, DL));
       return DAG.getNode(ISD::MERGE_VALUES, DL, Op->getVTList(), Res, Chain);
     }
+    case Intrinsic::x86_cmpccxadd32:
+    case Intrinsic::x86_cmpccxadd64: {
+      SDLoc DL(Op);
+      SDValue Chain = Op.getOperand(0);
+      SDValue Addr = Op.getOperand(2);
+      SDValue Src1 = Op.getOperand(3);
+      SDValue Src2 = Op.getOperand(4);
+      SDValue CC = Op.getOperand(5);
+      MachineMemOperand *MMO = cast<MemIntrinsicSDNode>(Op)->getMemOperand();
+      SDValue Operation = DAG.getMemIntrinsicNode(
+          X86ISD::CMPCCXADD32, DL, Op->getVTList(), {Chain, Addr, Src1, Src2, CC},
+          MVT::i32, MMO);
+      return Operation;
+    }
     }
     return SDValue();
   }
@@ -34154,6 +34170,8 @@
   NODE_NAME_CASE(AESDECWIDE128KL)
   NODE_NAME_CASE(AESENCWIDE256KL)
   NODE_NAME_CASE(AESDECWIDE256KL)
+  NODE_NAME_CASE(CMPCCXADD32)
+  NODE_NAME_CASE(CMPCCXADD64)
   NODE_NAME_CASE(TESTUI)
   }
   return nullptr;
diff --git a/llvm/lib/Target/X86/X86InstrFormats.td b/llvm/lib/Target/X86/X86InstrFormats.td
--- a/llvm/lib/Target/X86/X86InstrFormats.td
+++ b/llvm/lib/Target/X86/X86InstrFormats.td
@@ -28,6 +28,7 @@
 def RawFrmImm16   : Format<8>;
 def AddCCFrm      : Format<9>;
 def PrefixByte    : Format<10>;
+def MRMDestMem4VOp3CC : Format<20>;
 def MRMr0          : Format<21>;
 def MRMSrcMemFSIB  : Format<22>;
 def MRMDestMemFSIB : Format<23>;
diff --git a/llvm/lib/Target/X86/X86InstrInfo.td b/llvm/lib/Target/X86/X86InstrInfo.td
--- a/llvm/lib/Target/X86/X86InstrInfo.td
+++ b/llvm/lib/Target/X86/X86InstrInfo.td
@@ -131,6 +131,10 @@
                                               SDTCisVT<2, v2i64>,
                                               SDTCisPtrTy<3>]>;
 
+def SDTX86Cmpccxadd : SDTypeProfile<1, 4, [SDTCisSameAs<0, 2>,
+                                           SDTCisPtrTy<1>, SDTCisSameAs<2, 3>,
+                                           SDTCisVT<4, i8>]>;
+
 def X86MemBarrier : SDNode<"X86ISD::MEMBARRIER", SDT_X86MEMBARRIER,
                             [SDNPHasChain,SDNPSideEffect]>;
 def X86MFence : SDNode<"X86ISD::MFENCE", SDT_X86MEMBARRIER,
@@ -341,6 +345,10 @@
                             [SDNPHasChain, SDNPMayLoad, SDNPSideEffect,
                              SDNPMemOperand]>;
 
+def X86cmpccxadd : SDNode<"X86ISD::CMPCCXADD32", SDTX86Cmpccxadd,
+                          [SDNPHasChain, SDNPMayLoad, SDNPMayStore,
+                           SDNPMemOperand]>;
+
 //===----------------------------------------------------------------------===//
 // X86 Operand Definitions.
 //
@@ -980,6 +988,7 @@
 def HasCX16      : Predicate<"Subtarget->hasCX16()">;
 def HasPCONFIG   : Predicate<"Subtarget->hasPCONFIG()">;
 def HasENQCMD    : Predicate<"Subtarget->hasENQCMD()">;
+def HasCMPCCXADD : Predicate<"Subtarget->hasCMPCCXADD()">;
 def HasKL        : Predicate<"Subtarget->hasKL()">;
 def HasWIDEKL    : Predicate<"Subtarget->hasWIDEKL()">;
 def HasHRESET    : Predicate<"Subtarget->hasHRESET()">;
@@ -3009,6 +3018,48 @@
     "prefetchit1\t$src", [(prefetch addr:$src, (i32 0), (i32 2), (i32 0))]>, TB;
 }
 
+//===----------------------------------------------------------------------===//
+// CMPCCXADD Instructions
+//
+let Predicates = [HasCMPCCXADD, In64BitMode], Defs = [EFLAGS],
+    Constraints = "$dstsrc2 = $dst" in {
+def CMPCCXADDmr32 : I<0xe0, MRMDestMem4VOp3CC, (outs GR32:$dst),
+          (ins GR32:$dstsrc2, i32mem:$dstsrc1, GR32:$src3, ccode:$cond),
+          "cmp${cond}xadd\t{$src3, $dst, $dstsrc1|$dstsrc1, $dst, $src3}",
+          [(set GR32:$dst, (X86cmpccxadd addr:$dstsrc1, GR32:$dstsrc2, GR32:$src3, timm:$cond))]>,
+          VEX_4V, T8PD, Sched<[WriteXCHG]>;
+
+def CMPCCXADDmr64 : I<0xe0, MRMDestMem4VOp3CC, (outs GR64:$dst),
+          (ins GR64:$dstsrc2, i64mem:$dstsrc1, GR64:$src3, ccode:$cond),
+          "cmp${cond}xadd\t{$src3, $dst, $dstsrc1|$dstsrc1, $dst, $src3}",
+          [(set GR64:$dst, (X86cmpccxadd addr:$dstsrc1, GR64:$dstsrc2, GR64:$src3, timm:$cond))]>,
+          VEX_4V, VEX_W, T8PD, Sched<[WriteXCHG]>;
+}
+
+multiclass CMPCCXADD_Aliases<string Cond, int CC> {
+  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc1|$dstsrc1, $dst, $src3}",
+                  (CMPCCXADDmr32 GR32:$dst, i32mem:$dstsrc1, GR32:$src3, CC), 0>;
+  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc1|$dstsrc1, $dst, $src3}",
+                  (CMPCCXADDmr64 GR64:$dst, i64mem:$dstsrc1, GR64:$src3, CC), 0>;
+}
+
+defm : CMPCCXADD_Aliases<"o" ,  0>;
+defm : CMPCCXADD_Aliases<"no",  1>;
+defm : CMPCCXADD_Aliases<"b" ,  2>;
+defm : CMPCCXADD_Aliases<"nb",  3>;
+defm : CMPCCXADD_Aliases<"z" ,  4>;
+defm : CMPCCXADD_Aliases<"nz",  5>;
+defm : CMPCCXADD_Aliases<"be",  6>;
+defm : CMPCCXADD_Aliases<"nbe", 7>;
+defm : CMPCCXADD_Aliases<"s" ,  8>;
+defm : CMPCCXADD_Aliases<"ns",  9>;
+defm : CMPCCXADD_Aliases<"p" , 10>;
+defm : CMPCCXADD_Aliases<"np", 11>;
+defm : CMPCCXADD_Aliases<"l" , 12>;
+defm : CMPCCXADD_Aliases<"nl", 13>;
+defm : CMPCCXADD_Aliases<"le", 14>;
+defm : CMPCCXADD_Aliases<"nle",15>;
+
 //===----------------------------------------------------------------------===//
 // Pattern fragments to auto generate TBM instructions.
 //===----------------------------------------------------------------------===//
diff --git a/llvm/test/CodeGen/X86/cmpccxadd-intrinsics.ll b/llvm/test/CodeGen/X86/cmpccxadd-intrinsics.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/X86/cmpccxadd-intrinsics.ll
@@ -0,0 +1,358 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -verify-machineinstrs -mtriple=x86_64-unknown-unknown --show-mc-encoding -mattr=+cmpccxadd | FileCheck %s
+
+define dso_local i32 @test_cmpbexadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpbexadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpoxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe0,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 0)
+  ret i32 %0
+}
+
+declare i32 @llvm.x86.cmpccxadd32(i8*, i32, i32, i32 immarg)
+
+define dso_local i64 @test_cmpbexadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpbexadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpoxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe0,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 0)
+  ret i64 %0
+}
+
+declare i64 @llvm.x86.cmpccxadd64(i8*, i64, i64, i32 immarg)
+
+define dso_local i32 @test_cmpbxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpbxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpnoxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe1,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 1)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpbxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpbxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpnoxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe1,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 1)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmplexadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmplexadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpbxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe2,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 2)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmplexadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmplexadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpbxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe2,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 2)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmplxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmplxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpaexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe3,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 3)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmplxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmplxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpaexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe3,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 3)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnbexadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnbexadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe4,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 4)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnbexadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnbexadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe4,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 4)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnbxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnbxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpnexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe5,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 5)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnbxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnbxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpnexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe5,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 5)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnlexadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnlexadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpbexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe6,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 6)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnlexadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnlexadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpbexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe6,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 6)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnlxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnlxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpaxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe7,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 7)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnlxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnlxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpaxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe7,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 7)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnoxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnoxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpsxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe8,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 8)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnoxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnoxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpsxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe8,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 8)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnpxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnpxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpnsxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xe9,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 9)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnpxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnpxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpnsxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xe9,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 9)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnsxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnsxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmppxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xea,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 10)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnsxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnsxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmppxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xea,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 10)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpnzxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpnzxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpnpxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xeb,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 11)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpnzxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpnzxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpnpxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xeb,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 11)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpoxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpoxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmplxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xec,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 12)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpoxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpoxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmplxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xec,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 12)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmppxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmppxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpgexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xed,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 13)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmppxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmppxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpgexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xed,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 13)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpsxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpsxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmplexadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xee,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 14)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpsxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpsxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmplexadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xee,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 14)
+  ret i64 %0
+}
+
+define dso_local i32 @test_cmpzxadd32(i8* %__A, i32 %__B, i32 %__C) nounwind {
+; CHECK-LABEL: test_cmpzxadd32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl %esi, %eax # encoding: [0x89,0xf0]
+; CHECK-NEXT:    cmpgxadd %edx, %eax, (%rdi) # encoding: [0xc4,0xe2,0x69,0xef,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i32 @llvm.x86.cmpccxadd32(i8* %__A, i32 %__B, i32 %__C, i32 15)
+  ret i32 %0
+}
+
+define dso_local i64 @test_cmpzxadd64(i8* %__A, i64 %__B, i64 %__C) nounwind {
+; CHECK-LABEL: test_cmpzxadd64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movq %rsi, %rax # encoding: [0x48,0x89,0xf0]
+; CHECK-NEXT:    cmpgxadd %rdx, %rax, (%rdi) # encoding: [0xc4,0xe2,0xe9,0xef,0x07]
+; CHECK-NEXT:    retq # encoding: [0xc3]
+entry:
+  %0 = tail call i64 @llvm.x86.cmpccxadd64(i8* %__A, i64 %__B, i64 %__C, i32 15)
+  ret i64 %0
+}
diff --git a/llvm/test/MC/Disassembler/X86/cmpccxadd-64.txt b/llvm/test/MC/Disassembler/X86/cmpccxadd-64.txt
new file mode 100644
--- /dev/null
+++ b/llvm/test/MC/Disassembler/X86/cmpccxadd-64.txt
@@ -0,0 +1,771 @@
+# RUN: llvm-mc --disassemble %s -triple=x86_64 | FileCheck %s --check-prefixes=ATT
+# RUN: llvm-mc --disassemble %s -triple=x86_64 -x86-asm-syntax=intel --output-asm-variant=1 | FileCheck %s --check-prefixes=INTEL
+
+# ATT:   cmpbexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpbexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpbexadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpbexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpbexadd  %eax, %ecx, (%rip)
+# INTEL: cmpbexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe6,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpbexadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpbexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe6,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpbexadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpbexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe6,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpbexadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpbexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe6,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpbexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpbexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpbexadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpbexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpbexadd  %r10, %r9, (%rip)
+# INTEL: cmpbexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe6,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpbexadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpbexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe6,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpbexadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpbexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe6,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpbexadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpbexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe6,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpbxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpbxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpbxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpbxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpbxadd  %eax, %ecx, (%rip)
+# INTEL: cmpbxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe2,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpbxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpbxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe2,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpbxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpbxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe2,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpbxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpbxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe2,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpbxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpbxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpbxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpbxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpbxadd  %r10, %r9, (%rip)
+# INTEL: cmpbxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe2,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpbxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpbxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe2,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpbxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpbxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe2,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpbxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpbxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe2,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmplexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmplexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmplexadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmplexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xee,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmplexadd  %eax, %ecx, (%rip)
+# INTEL: cmplexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xee,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmplexadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmplexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xee,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmplexadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmplexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xee,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmplexadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmplexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xee,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmplexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmplexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmplexadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmplexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xee,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmplexadd  %r10, %r9, (%rip)
+# INTEL: cmplexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xee,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmplexadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmplexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xee,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmplexadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmplexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xee,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmplexadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmplexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xee,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmplxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmplxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmplxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmplxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xec,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmplxadd  %eax, %ecx, (%rip)
+# INTEL: cmplxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xec,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmplxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmplxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xec,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmplxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmplxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xec,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmplxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmplxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xec,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmplxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmplxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmplxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmplxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xec,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmplxadd  %r10, %r9, (%rip)
+# INTEL: cmplxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xec,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmplxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmplxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xec,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmplxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmplxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xec,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmplxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmplxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xec,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpaxadd %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpaxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpaxadd %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpaxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpaxadd %eax, %ecx, (%rip)
+# INTEL: cmpaxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe7,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpaxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpaxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe7,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpaxadd %eax, %ecx, 508(%rcx)
+# INTEL: cmpaxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe7,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpaxadd %eax, %ecx, -512(%rdx)
+# INTEL: cmpaxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe7,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpaxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpaxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpaxadd %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpaxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpaxadd %r10, %r9, (%rip)
+# INTEL: cmpaxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe7,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpaxadd %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpaxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe7,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpaxadd %r10, %r9, 1016(%rcx)
+# INTEL: cmpaxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe7,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpaxadd %r10, %r9, -1024(%rdx)
+# INTEL: cmpaxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe7,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpaexadd %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpaexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpaexadd %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpaexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpaexadd %eax, %ecx, (%rip)
+# INTEL: cmpaexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe3,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpaexadd %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpaexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe3,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpaexadd %eax, %ecx, 508(%rcx)
+# INTEL: cmpaexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe3,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpaexadd %eax, %ecx, -512(%rdx)
+# INTEL: cmpaexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe3,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpaexadd %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpaexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpaexadd %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpaexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpaexadd %r10, %r9, (%rip)
+# INTEL: cmpaexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe3,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpaexadd %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpaexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe3,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpaexadd %r10, %r9, 1016(%rcx)
+# INTEL: cmpaexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe3,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpaexadd %r10, %r9, -1024(%rdx)
+# INTEL: cmpaexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe3,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpgxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpgxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpgxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpgxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xef,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpgxadd  %eax, %ecx, (%rip)
+# INTEL: cmpgxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xef,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpgxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpgxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xef,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpgxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpgxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xef,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpgxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpgxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xef,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpgxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpgxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpgxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpgxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xef,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpgxadd  %r10, %r9, (%rip)
+# INTEL: cmpgxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xef,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpgxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpgxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xef,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpgxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpgxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xef,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpgxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpgxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xef,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpgexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpgexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpgexadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpgexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xed,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpgexadd  %eax, %ecx, (%rip)
+# INTEL: cmpgexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xed,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpgexadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpgexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xed,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpgexadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpgexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xed,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpgexadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpgexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xed,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpgexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpgexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpgexadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpgexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xed,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpgexadd  %r10, %r9, (%rip)
+# INTEL: cmpgexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xed,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpgexadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpgexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xed,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpgexadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpgexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xed,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpgexadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpgexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xed,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpnoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpnoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnoxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpnoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnoxadd  %eax, %ecx, (%rip)
+# INTEL: cmpnoxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe1,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnoxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpnoxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe1,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpnoxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpnoxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe1,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpnoxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpnoxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe1,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpnoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpnoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnoxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpnoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnoxadd  %r10, %r9, (%rip)
+# INTEL: cmpnoxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe1,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnoxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpnoxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe1,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpnoxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpnoxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe1,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpnoxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpnoxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe1,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpnpxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpnpxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnpxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpnpxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnpxadd  %eax, %ecx, (%rip)
+# INTEL: cmpnpxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xeb,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnpxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpnpxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xeb,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpnpxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpnpxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xeb,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpnpxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpnpxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xeb,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpnpxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpnpxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnpxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpnpxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnpxadd  %r10, %r9, (%rip)
+# INTEL: cmpnpxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xeb,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnpxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpnpxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xeb,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpnpxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpnpxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xeb,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpnpxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpnpxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xeb,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpnsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpnsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnsxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpnsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnsxadd  %eax, %ecx, (%rip)
+# INTEL: cmpnsxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe9,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnsxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpnsxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe9,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpnsxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpnsxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe9,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpnsxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpnsxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe9,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpnsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpnsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnsxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpnsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnsxadd  %r10, %r9, (%rip)
+# INTEL: cmpnsxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe9,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnsxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpnsxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe9,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpnsxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpnsxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe9,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpnsxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpnsxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe9,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpnexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpnexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnexadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpnexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnexadd  %eax, %ecx, (%rip)
+# INTEL: cmpnexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe5,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnexadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpnexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe5,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpnexadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpnexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe5,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpnexadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpnexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe5,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpnexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpnexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpnexadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpnexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpnexadd  %r10, %r9, (%rip)
+# INTEL: cmpnexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe5,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpnexadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpnexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe5,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpnexadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpnexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe5,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpnexadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpnexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe5,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpoxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpoxadd  %eax, %ecx, (%rip)
+# INTEL: cmpoxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe0,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpoxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpoxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe0,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpoxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpoxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe0,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpoxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpoxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe0,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpoxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpoxadd  %r10, %r9, (%rip)
+# INTEL: cmpoxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe0,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpoxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpoxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe0,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpoxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpoxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe0,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpoxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpoxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe0,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmppxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmppxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmppxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmppxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xea,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmppxadd  %eax, %ecx, (%rip)
+# INTEL: cmppxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xea,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmppxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmppxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xea,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmppxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmppxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xea,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmppxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmppxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xea,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmppxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmppxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmppxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmppxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xea,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmppxadd  %r10, %r9, (%rip)
+# INTEL: cmppxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xea,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmppxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmppxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xea,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmppxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmppxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xea,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmppxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmppxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xea,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpsxadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpsxadd  %eax, %ecx, (%rip)
+# INTEL: cmpsxadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe8,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpsxadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpsxadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe8,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpsxadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpsxadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe8,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpsxadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpsxadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe8,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpsxadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpsxadd  %r10, %r9, (%rip)
+# INTEL: cmpsxadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe8,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpsxadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpsxadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe8,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpsxadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpsxadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe8,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpsxadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpsxadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe8,0x8a,0x00,0xfc,0xff,0xff
+
+# ATT:   cmpexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+# INTEL: cmpexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+0xc4,0xa2,0x79,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpexadd  %eax, %ecx, 291(%r8,%rax,4)
+# INTEL: cmpexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+0xc4,0xc2,0x79,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpexadd  %eax, %ecx, (%rip)
+# INTEL: cmpexadd dword ptr [rip], ecx, eax
+0xc4,0xe2,0x79,0xe4,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpexadd  %eax, %ecx, -128(,%rbp,2)
+# INTEL: cmpexadd dword ptr [2*rbp - 128], ecx, eax
+0xc4,0xe2,0x79,0xe4,0x0c,0x6d,0x80,0xff,0xff,0xff
+
+# ATT:   cmpexadd  %eax, %ecx, 508(%rcx)
+# INTEL: cmpexadd dword ptr [rcx + 508], ecx, eax
+0xc4,0xe2,0x79,0xe4,0x89,0xfc,0x01,0x00,0x00
+
+# ATT:   cmpexadd  %eax, %ecx, -512(%rdx)
+# INTEL: cmpexadd dword ptr [rdx - 512], ecx, eax
+0xc4,0xe2,0x79,0xe4,0x8a,0x00,0xfe,0xff,0xff
+
+# ATT:   cmpexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+# INTEL: cmpexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+0xc4,0x22,0xa9,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10
+
+# ATT:   cmpexadd  %r10, %r9, 291(%r8,%rax,4)
+# INTEL: cmpexadd qword ptr [r8 + 4*rax + 291], r9, r10
+0xc4,0x42,0xa9,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00
+
+# ATT:   cmpexadd  %r10, %r9, (%rip)
+# INTEL: cmpexadd qword ptr [rip], r9, r10
+0xc4,0x62,0xa9,0xe4,0x0d,0x00,0x00,0x00,0x00
+
+# ATT:   cmpexadd  %r10, %r9, -256(,%rbp,2)
+# INTEL: cmpexadd qword ptr [2*rbp - 256], r9, r10
+0xc4,0x62,0xa9,0xe4,0x0c,0x6d,0x00,0xff,0xff,0xff
+
+# ATT:   cmpexadd  %r10, %r9, 1016(%rcx)
+# INTEL: cmpexadd qword ptr [rcx + 1016], r9, r10
+0xc4,0x62,0xa9,0xe4,0x89,0xf8,0x03,0x00,0x00
+
+# ATT:   cmpexadd  %r10, %r9, -1024(%rdx)
+# INTEL: cmpexadd qword ptr [rdx - 1024], r9, r10
+0xc4,0x62,0xa9,0xe4,0x8a,0x00,0xfc,0xff,0xff
+
diff --git a/llvm/test/MC/X86/cmpccxadd-att-64.s b/llvm/test/MC/X86/cmpccxadd-att-64.s
new file mode 100644
--- /dev/null
+++ b/llvm/test/MC/X86/cmpccxadd-att-64.s
@@ -0,0 +1,770 @@
+// RUN: llvm-mc -triple x86_64 --show-encoding %s | FileCheck %s
+
+// CHECK: cmpbexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpbexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbexadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpbexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x0d,0x00,0x00,0x00,0x00]
+          cmpbexadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpbexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpbexadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpbexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x89,0xfc,0x01,0x00,0x00]
+          cmpbexadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpbexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x8a,0x00,0xfe,0xff,0xff]
+          cmpbexadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpbexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpbexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbexadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpbexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x0d,0x00,0x00,0x00,0x00]
+          cmpbexadd  %r10, %r9, (%rip)
+
+// CHECK: cmpbexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpbexadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpbexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x89,0xf8,0x03,0x00,0x00]
+          cmpbexadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpbexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x8a,0x00,0xfc,0xff,0xff]
+          cmpbexadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpbxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpbxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpbxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x0d,0x00,0x00,0x00,0x00]
+          cmpbxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpbxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpbxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpbxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x89,0xfc,0x01,0x00,0x00]
+          cmpbxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpbxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x8a,0x00,0xfe,0xff,0xff]
+          cmpbxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpbxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpbxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpbxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x0d,0x00,0x00,0x00,0x00]
+          cmpbxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpbxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpbxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpbxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x89,0xf8,0x03,0x00,0x00]
+          cmpbxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpbxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x8a,0x00,0xfc,0xff,0xff]
+          cmpbxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmplexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmplexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xee,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplexadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmplexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x0d,0x00,0x00,0x00,0x00]
+          cmplexadd  %eax, %ecx, (%rip)
+
+// CHECK: cmplexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmplexadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmplexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x89,0xfc,0x01,0x00,0x00]
+          cmplexadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmplexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x8a,0x00,0xfe,0xff,0xff]
+          cmplexadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmplexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmplexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xee,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplexadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmplexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x0d,0x00,0x00,0x00,0x00]
+          cmplexadd  %r10, %r9, (%rip)
+
+// CHECK: cmplexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmplexadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmplexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x89,0xf8,0x03,0x00,0x00]
+          cmplexadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmplexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x8a,0x00,0xfc,0xff,0xff]
+          cmplexadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmplxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmplxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xec,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmplxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x0d,0x00,0x00,0x00,0x00]
+          cmplxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmplxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmplxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmplxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x89,0xfc,0x01,0x00,0x00]
+          cmplxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmplxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x8a,0x00,0xfe,0xff,0xff]
+          cmplxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmplxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmplxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xec,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmplxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x0d,0x00,0x00,0x00,0x00]
+          cmplxadd  %r10, %r9, (%rip)
+
+// CHECK: cmplxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmplxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmplxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x89,0xf8,0x03,0x00,0x00]
+          cmplxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmplxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x8a,0x00,0xfc,0xff,0xff]
+          cmplxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpaxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpaxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbexadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpaxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbexadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpaxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnbexadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpaxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x89,0xfc,0x01,0x00,0x00]
+          cmpnbexadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpaxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnbexadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpaxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpaxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbexadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpaxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbexadd  %r10, %r9, (%rip)
+
+// CHECK: cmpaxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnbexadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpaxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x89,0xf8,0x03,0x00,0x00]
+          cmpnbexadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpaxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnbexadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpaexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpaexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpaexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpaexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnbxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpaexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x89,0xfc,0x01,0x00,0x00]
+          cmpnbxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpaexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnbxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpaexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpaexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpaexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpaexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnbxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpaexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x89,0xf8,0x03,0x00,0x00]
+          cmpnbxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpaexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnbxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpgxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpgxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xef,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlexadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpgxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlexadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpgxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnlexadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpgxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x89,0xfc,0x01,0x00,0x00]
+          cmpnlexadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpgxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnlexadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpgxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpgxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xef,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlexadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpgxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlexadd  %r10, %r9, (%rip)
+
+// CHECK: cmpgxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnlexadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpgxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x89,0xf8,0x03,0x00,0x00]
+          cmpnlexadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpgxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnlexadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpgexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpgexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xed,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpgexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpgexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnlxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpgexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x89,0xfc,0x01,0x00,0x00]
+          cmpnlxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpgexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnlxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpgexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpgexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xed,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpgexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpgexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnlxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpgexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x89,0xf8,0x03,0x00,0x00]
+          cmpnlxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpgexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnlxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpnoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnoxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnoxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpnoxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x0d,0x00,0x00,0x00,0x00]
+          cmpnoxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpnoxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnoxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpnoxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x89,0xfc,0x01,0x00,0x00]
+          cmpnoxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpnoxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnoxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpnoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnoxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnoxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpnoxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x0d,0x00,0x00,0x00,0x00]
+          cmpnoxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpnoxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnoxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpnoxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x89,0xf8,0x03,0x00,0x00]
+          cmpnoxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpnoxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnoxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpnpxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnpxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnpxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnpxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpnpxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x0d,0x00,0x00,0x00,0x00]
+          cmpnpxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpnpxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnpxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpnpxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x89,0xfc,0x01,0x00,0x00]
+          cmpnpxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpnpxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnpxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpnpxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnpxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnpxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnpxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpnpxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x0d,0x00,0x00,0x00,0x00]
+          cmpnpxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpnpxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnpxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpnpxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x89,0xf8,0x03,0x00,0x00]
+          cmpnpxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpnpxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnpxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpnsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnsxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnsxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpnsxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x0d,0x00,0x00,0x00,0x00]
+          cmpnsxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpnsxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnsxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpnsxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x89,0xfc,0x01,0x00,0x00]
+          cmpnsxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpnsxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnsxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpnsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnsxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnsxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpnsxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x0d,0x00,0x00,0x00,0x00]
+          cmpnsxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpnsxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnsxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpnsxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x89,0xf8,0x03,0x00,0x00]
+          cmpnsxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpnsxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnsxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpnexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnzxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnzxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpnexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x0d,0x00,0x00,0x00,0x00]
+          cmpnzxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpnexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnzxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpnexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x89,0xfc,0x01,0x00,0x00]
+          cmpnzxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpnexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnzxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpnexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnzxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpnexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnzxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpnexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x0d,0x00,0x00,0x00,0x00]
+          cmpnzxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpnexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnzxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpnexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x89,0xf8,0x03,0x00,0x00]
+          cmpnzxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpnexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnzxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpoxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpoxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpoxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpoxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x0d,0x00,0x00,0x00,0x00]
+          cmpoxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpoxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpoxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpoxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x89,0xfc,0x01,0x00,0x00]
+          cmpoxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpoxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x8a,0x00,0xfe,0xff,0xff]
+          cmpoxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpoxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpoxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpoxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpoxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x0d,0x00,0x00,0x00,0x00]
+          cmpoxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpoxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpoxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpoxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x89,0xf8,0x03,0x00,0x00]
+          cmpoxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpoxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x8a,0x00,0xfc,0xff,0xff]
+          cmpoxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmppxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmppxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmppxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xea,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmppxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmppxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x0d,0x00,0x00,0x00,0x00]
+          cmppxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmppxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmppxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmppxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x89,0xfc,0x01,0x00,0x00]
+          cmppxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmppxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x8a,0x00,0xfe,0xff,0xff]
+          cmppxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmppxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmppxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmppxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xea,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmppxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmppxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x0d,0x00,0x00,0x00,0x00]
+          cmppxadd  %r10, %r9, (%rip)
+
+// CHECK: cmppxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmppxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmppxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x89,0xf8,0x03,0x00,0x00]
+          cmppxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmppxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x8a,0x00,0xfc,0xff,0xff]
+          cmppxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpsxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpsxadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpsxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpsxadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x0d,0x00,0x00,0x00,0x00]
+          cmpsxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpsxadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpsxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpsxadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x89,0xfc,0x01,0x00,0x00]
+          cmpsxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpsxadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x8a,0x00,0xfe,0xff,0xff]
+          cmpsxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpsxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpsxadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpsxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpsxadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x0d,0x00,0x00,0x00,0x00]
+          cmpsxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpsxadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpsxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpsxadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x89,0xf8,0x03,0x00,0x00]
+          cmpsxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpsxadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x8a,0x00,0xfc,0xff,0xff]
+          cmpsxadd  %r10, %r9, -1024(%rdx)
+
+// CHECK: cmpexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpzxadd  %eax, %ecx, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpexadd  %eax, %ecx, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpzxadd  %eax, %ecx, 291(%r8,%rax,4)
+
+// CHECK: cmpexadd  %eax, %ecx, (%rip)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x0d,0x00,0x00,0x00,0x00]
+          cmpzxadd  %eax, %ecx, (%rip)
+
+// CHECK: cmpexadd  %eax, %ecx, -128(,%rbp,2)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpzxadd  %eax, %ecx, -128(,%rbp,2)
+
+// CHECK: cmpexadd  %eax, %ecx, 508(%rcx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x89,0xfc,0x01,0x00,0x00]
+          cmpzxadd  %eax, %ecx, 508(%rcx)
+
+// CHECK: cmpexadd  %eax, %ecx, -512(%rdx)
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x8a,0x00,0xfe,0xff,0xff]
+          cmpzxadd  %eax, %ecx, -512(%rdx)
+
+// CHECK: cmpexadd  %r10, %r9, 268435456(%rbp,%r14,8)
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpzxadd  %r10, %r9, 268435456(%rbp,%r14,8)
+
+// CHECK: cmpexadd  %r10, %r9, 291(%r8,%rax,4)
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpzxadd  %r10, %r9, 291(%r8,%rax,4)
+
+// CHECK: cmpexadd  %r10, %r9, (%rip)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x0d,0x00,0x00,0x00,0x00]
+          cmpzxadd  %r10, %r9, (%rip)
+
+// CHECK: cmpexadd  %r10, %r9, -256(,%rbp,2)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpzxadd  %r10, %r9, -256(,%rbp,2)
+
+// CHECK: cmpexadd  %r10, %r9, 1016(%rcx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x89,0xf8,0x03,0x00,0x00]
+          cmpzxadd  %r10, %r9, 1016(%rcx)
+
+// CHECK: cmpexadd  %r10, %r9, -1024(%rdx)
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x8a,0x00,0xfc,0xff,0xff]
+          cmpzxadd  %r10, %r9, -1024(%rdx)
+
diff --git a/llvm/test/MC/X86/cmpccxadd-intel-64.s b/llvm/test/MC/X86/cmpccxadd-intel-64.s
new file mode 100644
--- /dev/null
+++ b/llvm/test/MC/X86/cmpccxadd-intel-64.s
@@ -0,0 +1,770 @@
+// RUN: llvm-mc -triple x86_64 -x86-asm-syntax=intel -output-asm-variant=1 --show-encoding %s | FileCheck %s
+
+// CHECK: cmpbexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpbexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpbexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x0d,0x00,0x00,0x00,0x00]
+          cmpbexadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpbexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpbexadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpbexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x89,0xfc,0x01,0x00,0x00]
+          cmpbexadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpbexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x8a,0x00,0xfe,0xff,0xff]
+          cmpbexadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpbexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpbexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe6,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbexadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpbexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x0d,0x00,0x00,0x00,0x00]
+          cmpbexadd qword ptr [rip], r9, r10
+
+// CHECK: cmpbexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpbexadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpbexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x89,0xf8,0x03,0x00,0x00]
+          cmpbexadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpbexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe6,0x8a,0x00,0xfc,0xff,0xff]
+          cmpbexadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpbxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpbxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpbxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x0d,0x00,0x00,0x00,0x00]
+          cmpbxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpbxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpbxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpbxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x89,0xfc,0x01,0x00,0x00]
+          cmpbxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpbxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe2,0x8a,0x00,0xfe,0xff,0xff]
+          cmpbxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpbxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe2,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpbxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpbxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe2,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpbxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpbxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x0d,0x00,0x00,0x00,0x00]
+          cmpbxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpbxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpbxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpbxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x89,0xf8,0x03,0x00,0x00]
+          cmpbxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpbxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe2,0x8a,0x00,0xfc,0xff,0xff]
+          cmpbxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmplexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmplexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xee,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmplexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x0d,0x00,0x00,0x00,0x00]
+          cmplexadd dword ptr [rip], ecx, eax
+
+// CHECK: cmplexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmplexadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmplexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x89,0xfc,0x01,0x00,0x00]
+          cmplexadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmplexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xee,0x8a,0x00,0xfe,0xff,0xff]
+          cmplexadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmplexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xee,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmplexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xee,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplexadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmplexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x0d,0x00,0x00,0x00,0x00]
+          cmplexadd qword ptr [rip], r9, r10
+
+// CHECK: cmplexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmplexadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmplexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x89,0xf8,0x03,0x00,0x00]
+          cmplexadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmplexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xee,0x8a,0x00,0xfc,0xff,0xff]
+          cmplexadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmplxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmplxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xec,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmplxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x0d,0x00,0x00,0x00,0x00]
+          cmplxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmplxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmplxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmplxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x89,0xfc,0x01,0x00,0x00]
+          cmplxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmplxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xec,0x8a,0x00,0xfe,0xff,0xff]
+          cmplxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmplxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xec,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmplxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmplxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xec,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmplxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmplxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x0d,0x00,0x00,0x00,0x00]
+          cmplxadd qword ptr [rip], r9, r10
+
+// CHECK: cmplxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmplxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmplxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x89,0xf8,0x03,0x00,0x00]
+          cmplxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmplxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xec,0x8a,0x00,0xfc,0xff,0xff]
+          cmplxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpaxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpaxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpaxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbexadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpaxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnbexadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpaxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x89,0xfc,0x01,0x00,0x00]
+          cmpnbexadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpaxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe7,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnbexadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpaxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe7,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpaxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe7,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbexadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpaxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbexadd qword ptr [rip], r9, r10
+
+// CHECK: cmpaxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnbexadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpaxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x89,0xf8,0x03,0x00,0x00]
+          cmpnbexadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpaxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe7,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnbexadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpaexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpaexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpaexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpaexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnbxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpaexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x89,0xfc,0x01,0x00,0x00]
+          cmpnbxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpaexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe3,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnbxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpaexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe3,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnbxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpaexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe3,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnbxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpaexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x0d,0x00,0x00,0x00,0x00]
+          cmpnbxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpaexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnbxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpaexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x89,0xf8,0x03,0x00,0x00]
+          cmpnbxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpaexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe3,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnbxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpgxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpgxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xef,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpgxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlexadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpgxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnlexadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpgxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x89,0xfc,0x01,0x00,0x00]
+          cmpnlexadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpgxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xef,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnlexadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpgxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xef,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpgxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xef,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlexadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpgxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlexadd qword ptr [rip], r9, r10
+
+// CHECK: cmpgxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnlexadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpgxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x89,0xf8,0x03,0x00,0x00]
+          cmpnlexadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpgxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xef,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnlexadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpgexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpgexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xed,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpgexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpgexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnlxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpgexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x89,0xfc,0x01,0x00,0x00]
+          cmpnlxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpgexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xed,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnlxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpgexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xed,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnlxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpgexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xed,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnlxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpgexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x0d,0x00,0x00,0x00,0x00]
+          cmpnlxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpgexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnlxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpgexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x89,0xf8,0x03,0x00,0x00]
+          cmpnlxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpgexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xed,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnlxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpnoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpnoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpnoxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x0d,0x00,0x00,0x00,0x00]
+          cmpnoxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpnoxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnoxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpnoxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x89,0xfc,0x01,0x00,0x00]
+          cmpnoxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpnoxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe1,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnoxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpnoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe1,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpnoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe1,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpnoxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x0d,0x00,0x00,0x00,0x00]
+          cmpnoxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpnoxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnoxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpnoxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x89,0xf8,0x03,0x00,0x00]
+          cmpnoxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpnoxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe1,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnoxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpnpxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnpxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpnpxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnpxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpnpxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x0d,0x00,0x00,0x00,0x00]
+          cmpnpxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpnpxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnpxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpnpxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x89,0xfc,0x01,0x00,0x00]
+          cmpnpxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpnpxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xeb,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnpxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpnpxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xeb,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnpxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpnpxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xeb,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnpxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpnpxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x0d,0x00,0x00,0x00,0x00]
+          cmpnpxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpnpxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnpxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpnpxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x89,0xf8,0x03,0x00,0x00]
+          cmpnpxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpnpxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xeb,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnpxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpnsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpnsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpnsxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x0d,0x00,0x00,0x00,0x00]
+          cmpnsxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpnsxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnsxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpnsxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x89,0xfc,0x01,0x00,0x00]
+          cmpnsxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpnsxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe9,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnsxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpnsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe9,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpnsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe9,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpnsxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x0d,0x00,0x00,0x00,0x00]
+          cmpnsxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpnsxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnsxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpnsxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x89,0xf8,0x03,0x00,0x00]
+          cmpnsxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpnsxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe9,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnsxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpnexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnzxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpnexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnzxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpnexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x0d,0x00,0x00,0x00,0x00]
+          cmpnzxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpnexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpnzxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpnexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x89,0xfc,0x01,0x00,0x00]
+          cmpnzxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpnexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe5,0x8a,0x00,0xfe,0xff,0xff]
+          cmpnzxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpnexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe5,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpnzxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpnexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe5,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpnzxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpnexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x0d,0x00,0x00,0x00,0x00]
+          cmpnzxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpnexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpnzxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpnexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x89,0xf8,0x03,0x00,0x00]
+          cmpnzxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpnexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe5,0x8a,0x00,0xfc,0xff,0xff]
+          cmpnzxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpoxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpoxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpoxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x0d,0x00,0x00,0x00,0x00]
+          cmpoxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpoxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpoxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpoxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x89,0xfc,0x01,0x00,0x00]
+          cmpoxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpoxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe0,0x8a,0x00,0xfe,0xff,0xff]
+          cmpoxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe0,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpoxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe0,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpoxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpoxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x0d,0x00,0x00,0x00,0x00]
+          cmpoxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpoxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpoxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpoxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x89,0xf8,0x03,0x00,0x00]
+          cmpoxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpoxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe0,0x8a,0x00,0xfc,0xff,0xff]
+          cmpoxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmppxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmppxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmppxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xea,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmppxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmppxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x0d,0x00,0x00,0x00,0x00]
+          cmppxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmppxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmppxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmppxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x89,0xfc,0x01,0x00,0x00]
+          cmppxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmppxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xea,0x8a,0x00,0xfe,0xff,0xff]
+          cmppxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmppxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xea,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmppxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmppxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xea,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmppxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmppxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x0d,0x00,0x00,0x00,0x00]
+          cmppxadd qword ptr [rip], r9, r10
+
+// CHECK: cmppxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmppxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmppxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x89,0xf8,0x03,0x00,0x00]
+          cmppxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmppxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xea,0x8a,0x00,0xfc,0xff,0xff]
+          cmppxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpsxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpsxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpsxadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x0d,0x00,0x00,0x00,0x00]
+          cmpsxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpsxadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpsxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpsxadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x89,0xfc,0x01,0x00,0x00]
+          cmpsxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpsxadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe8,0x8a,0x00,0xfe,0xff,0xff]
+          cmpsxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe8,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpsxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe8,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpsxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpsxadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x0d,0x00,0x00,0x00,0x00]
+          cmpsxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpsxadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpsxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpsxadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x89,0xf8,0x03,0x00,0x00]
+          cmpsxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpsxadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe8,0x8a,0x00,0xfc,0xff,0xff]
+          cmpsxadd qword ptr [rdx - 1024], r9, r10
+
+// CHECK: cmpexadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+// CHECK: encoding: [0xc4,0xa2,0x79,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpzxadd dword ptr [rbp + 8*r14 + 268435456], ecx, eax
+
+// CHECK: cmpexadd dword ptr [r8 + 4*rax + 291], ecx, eax
+// CHECK: encoding: [0xc4,0xc2,0x79,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpzxadd dword ptr [r8 + 4*rax + 291], ecx, eax
+
+// CHECK: cmpexadd dword ptr [rip], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x0d,0x00,0x00,0x00,0x00]
+          cmpzxadd dword ptr [rip], ecx, eax
+
+// CHECK: cmpexadd dword ptr [2*rbp - 128], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x0c,0x6d,0x80,0xff,0xff,0xff]
+          cmpzxadd dword ptr [2*rbp - 128], ecx, eax
+
+// CHECK: cmpexadd dword ptr [rcx + 508], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x89,0xfc,0x01,0x00,0x00]
+          cmpzxadd dword ptr [rcx + 508], ecx, eax
+
+// CHECK: cmpexadd dword ptr [rdx - 512], ecx, eax
+// CHECK: encoding: [0xc4,0xe2,0x79,0xe4,0x8a,0x00,0xfe,0xff,0xff]
+          cmpzxadd dword ptr [rdx - 512], ecx, eax
+
+// CHECK: cmpexadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+// CHECK: encoding: [0xc4,0x22,0xa9,0xe4,0x8c,0xf5,0x00,0x00,0x00,0x10]
+          cmpzxadd qword ptr [rbp + 8*r14 + 268435456], r9, r10
+
+// CHECK: cmpexadd qword ptr [r8 + 4*rax + 291], r9, r10
+// CHECK: encoding: [0xc4,0x42,0xa9,0xe4,0x8c,0x80,0x23,0x01,0x00,0x00]
+          cmpzxadd qword ptr [r8 + 4*rax + 291], r9, r10
+
+// CHECK: cmpexadd qword ptr [rip], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x0d,0x00,0x00,0x00,0x00]
+          cmpzxadd qword ptr [rip], r9, r10
+
+// CHECK: cmpexadd qword ptr [2*rbp - 256], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x0c,0x6d,0x00,0xff,0xff,0xff]
+          cmpzxadd qword ptr [2*rbp - 256], r9, r10
+
+// CHECK: cmpexadd qword ptr [rcx + 1016], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x89,0xf8,0x03,0x00,0x00]
+          cmpzxadd qword ptr [rcx + 1016], r9, r10
+
+// CHECK: cmpexadd qword ptr [rdx - 1024], r9, r10
+// CHECK: encoding: [0xc4,0x62,0xa9,0xe4,0x8a,0x00,0xfc,0xff,0xff]
+          cmpzxadd qword ptr [rdx - 1024], r9, r10
+
diff --git a/llvm/utils/TableGen/X86RecognizableInstr.h b/llvm/utils/TableGen/X86RecognizableInstr.h
--- a/llvm/utils/TableGen/X86RecognizableInstr.h
+++ b/llvm/utils/TableGen/X86RecognizableInstr.h
@@ -106,6 +106,7 @@
     RawFrmImm16   = 8,
     AddCCFrm      = 9,
     PrefixByte    = 10,
+    MRMDestMem4VOp3CC = 20,
     MRMr0          = 21,
     MRMSrcMemFSIB  = 22,
     MRMDestMemFSIB = 23,
diff --git a/llvm/utils/TableGen/X86RecognizableInstr.cpp b/llvm/utils/TableGen/X86RecognizableInstr.cpp
--- a/llvm/utils/TableGen/X86RecognizableInstr.cpp
+++ b/llvm/utils/TableGen/X86RecognizableInstr.cpp
@@ -546,6 +546,17 @@
     HANDLE_OPERAND(roRegister)
     HANDLE_OPTIONAL(immediate)
     break;
+  case X86Local::MRMDestMem4VOp3CC:
+    // Operand 1 is a sibmem/memory operand
+    // Operand 2 is a mod/r
+    // Operand 3 is VEX.vvvv
+    assert(numPhysicalOperands == 4 &&
+           "Unexpected number of operands for MRMDestMem4VOp3CC");
+    HANDLE_OPERAND(roRegister)
+    HANDLE_OPERAND(memory)
+    HANDLE_OPERAND(vvvvRegister)
+    HANDLE_OPERAND(opcodeModifier)
+    break;
   case X86Local::MRMDestMem:
   case X86Local::MRMDestMemFSIB:
     // Operand 1 is a memory operand (possibly SIB-extended)
@@ -808,6 +819,7 @@
     filter = std::make_unique<ModFilter>(true);
     break;
   case X86Local::MRMDestMem:
+  case X86Local::MRMDestMem4VOp3CC:
   case X86Local::MRMDestMemFSIB:
   case X86Local::MRMSrcMem:
   case X86Local::MRMSrcMemFSIB:
@@ -858,7 +870,8 @@
 
   if (Form == X86Local::AddRegFrm || Form == X86Local::MRMSrcRegCC ||
       Form == X86Local::MRMSrcMemCC || Form == X86Local::MRMXrCC ||
-      Form == X86Local::MRMXmCC || Form == X86Local::AddCCFrm) {
+      Form == X86Local::MRMXmCC || Form == X86Local::AddCCFrm ||
+      Form == X86Local::MRMDestMem4VOp3CC) {
     uint8_t Count = Form == X86Local::AddRegFrm ? 8 : 16;
     assert(((opcodeToSet % Count) == 0) && "ADDREG_FRM opcode not aligned");