Index: include/clang/Basic/BuiltinsX86.def
===================================================================
--- include/clang/Basic/BuiltinsX86.def
+++ include/clang/Basic/BuiltinsX86.def
@@ -1887,6 +1887,9 @@
 TARGET_BUILTIN(__builtin_ia32_directstore_u32, "vUi*Ui", "n", "movdiri")
 TARGET_BUILTIN(__builtin_ia32_movdir64b, "vv*vC*", "n", "movdir64b")
 
+// PTWRITE
+TARGET_BUILTIN(__builtin_ia32_ptwrite32, "vUi", "n", "ptwrite")
+
 // MSVC
 TARGET_HEADER_BUILTIN(_BitScanForward, "UcUNi*UNi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_BitScanReverse, "UcUNi*UNi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
Index: include/clang/Basic/BuiltinsX86_64.def
===================================================================
--- include/clang/Basic/BuiltinsX86_64.def
+++ include/clang/Basic/BuiltinsX86_64.def
@@ -95,6 +95,7 @@
 TARGET_BUILTIN(__builtin_ia32_cvtusi2sd64, "V2dV2dULLiIi", "n", "avx512f")
 TARGET_BUILTIN(__builtin_ia32_cvtusi2ss64, "V4fV4fULLiIi", "n", "avx512f")
 TARGET_BUILTIN(__builtin_ia32_directstore_u64, "vULi*ULi", "n", "movdiri")
+TARGET_BUILTIN(__builtin_ia32_ptwrite64, "vULLi", "n", "ptwrite")
 
 #undef BUILTIN
 #undef TARGET_BUILTIN
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -2682,6 +2682,8 @@
 def mno_prefetchwt1 : Flag<["-"], "mno-prefetchwt1">, Group<m_x86_Features_Group>;
 def mprfchw : Flag<["-"], "mprfchw">, Group<m_x86_Features_Group>;
 def mno_prfchw : Flag<["-"], "mno-prfchw">, Group<m_x86_Features_Group>;
+def mptwrite : Flag<["-"], "mptwrite">, Group<m_x86_Features_Group>;
+def mno_ptwrite : Flag<["-"], "mno-ptwrite">, Group<m_x86_Features_Group>;
 def mrdpid : Flag<["-"], "mrdpid">, Group<m_x86_Features_Group>;
 def mno_rdpid : Flag<["-"], "mno-rdpid">, Group<m_x86_Features_Group>;
 def mrdrnd : Flag<["-"], "mrdrnd">, Group<m_x86_Features_Group>;
Index: lib/Basic/Targets/X86.h
===================================================================
--- lib/Basic/Targets/X86.h
+++ lib/Basic/Targets/X86.h
@@ -106,6 +106,7 @@
   bool HasWAITPKG = false;
   bool HasMOVDIRI = false;
   bool HasMOVDIR64B = false;
+  bool HasPTWRITE = false;
 
 protected:
   /// \brief Enumeration of all of the X86 CPUs supported by Clang.
Index: lib/Basic/Targets/X86.cpp
===================================================================
--- lib/Basic/Targets/X86.cpp
+++ lib/Basic/Targets/X86.cpp
@@ -253,6 +253,7 @@
     setFeatureEnabledImpl(Features, "waitpkg", true);
     LLVM_FALLTHROUGH;
   case CK_GoldmontPlus:
+    setFeatureEnabledImpl(Features, "ptwrite", true);
     setFeatureEnabledImpl(Features, "rdpid", true);
     setFeatureEnabledImpl(Features, "sgx", true);
     LLVM_FALLTHROUGH;
@@ -830,6 +831,8 @@
       HasMOVDIR64B = true;
     } else if (Feature == "+pconfig") {
       HasPCONFIG = true;
+    } else if (Feature == "+ptwrite") {
+      HasPTWRITE = true;
     }
 
     X86SSEEnum Level = llvm::StringSwitch<X86SSEEnum>(Feature)
@@ -1192,6 +1195,8 @@
     Builder.defineMacro("__MOVDIR64B__");
   if (HasPCONFIG)
     Builder.defineMacro("__PCONFIG__");
+  if (HasPTWRITE)
+    Builder.defineMacro("__PTWRITE__");
 
   // Each case falls through to the previous one here.
   switch (SSELevel) {
@@ -1326,6 +1331,7 @@
       .Case("popcnt", true)
       .Case("prefetchwt1", true)
       .Case("prfchw", true)
+      .Case("ptwrite", true)
       .Case("rdpid", true)
       .Case("rdrnd", true)
       .Case("rdseed", true)
@@ -1405,6 +1411,7 @@
       .Case("popcnt", HasPOPCNT)
       .Case("prefetchwt1", HasPREFETCHWT1)
       .Case("prfchw", HasPRFCHW)
+      .Case("ptwrite", HasPTWRITE)
       .Case("rdpid", HasRDPID)
       .Case("rdrnd", HasRDRND)
       .Case("rdseed", HasRDSEED)
Index: lib/Headers/CMakeLists.txt
===================================================================
--- lib/Headers/CMakeLists.txt
+++ lib/Headers/CMakeLists.txt
@@ -76,6 +76,7 @@
   pconfigintrin.h
   popcntintrin.h
   prfchwintrin.h
+  ptwriteintrin.h
   rdseedintrin.h
   rtmintrin.h
   sgxintrin.h
Index: lib/Headers/cpuid.h
===================================================================
--- lib/Headers/cpuid.h
+++ lib/Headers/cpuid.h
@@ -202,6 +202,9 @@
 #define bit_XSAVEC      0x00000002
 #define bit_XSAVES      0x00000008
 
+/* Features in %eax for leaf 0x14 sub-leaf 0 */
+#define bit_PTWRITE     0x00000010
+
 /* Features in %ecx for leaf 0x80000001 */
 #define bit_LAHF_LM     0x00000001
 #define bit_ABM         0x00000020
Index: lib/Headers/module.modulemap
===================================================================
--- lib/Headers/module.modulemap
+++ lib/Headers/module.modulemap
@@ -69,6 +69,7 @@
     textual header "movdirintrin.h"
     textual header "pconfigintrin.h"
     textual header "sgxintrin.h"
+    textual header "ptwriteintrin.h"
 
     explicit module mm_malloc {
       requires !freestanding
Index: lib/Headers/ptwriteintrin.h
===================================================================
--- /dev/null
+++ lib/Headers/ptwriteintrin.h
@@ -0,0 +1,51 @@
+/*===------------ ptwriteintrin.h - PTWRITE intrinsic --------------------===
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+#ifndef __X86INTRIN_H
+#error "Never use <ptwriteintrin.h> directly; include <x86intrin.h> instead."
+#endif
+
+#ifndef __PTWRITEINTRIN_H
+#define __PTWRITEINTRIN_H
+
+/* Define the default attributes for the functions in this file. */
+#define __DEFAULT_FN_ATTRS \
+  __attribute__((__always_inline__, __nodebug__,  __target__("ptwrite")))
+
+static __inline__ void __DEFAULT_FN_ATTRS
+_ptwrite32(unsigned int __value) {
+  __builtin_ia32_ptwrite32(__value);
+}
+
+#ifdef __x86_64__
+
+static __inline__ void __DEFAULT_FN_ATTRS
+_ptwrite64(unsigned long long __value) {
+  __builtin_ia32_ptwrite64(__value);
+}
+
+#endif /* __x86_64__ */
+
+#undef __DEFAULT_FN_ATTRS
+
+#endif /* __PTWRITEINTRIN_H */
Index: lib/Headers/x86intrin.h
===================================================================
--- lib/Headers/x86intrin.h
+++ lib/Headers/x86intrin.h
@@ -113,4 +113,8 @@
 #include <sgxintrin.h>
 #endif
 
+#if !defined(_MSC_VER) || __has_feature(modules) || defined(__PTWRITE__)
+#include <ptwriteintrin.h>
+#endif
+
 #endif /* __X86INTRIN_H */
Index: test/CodeGen/ptwrite.c
===================================================================
--- /dev/null
+++ test/CodeGen/ptwrite.c
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 %s -ffreestanding -triple=x86_64-unknown-unknown -target-feature +ptwrite -emit-llvm -o - -Wall -Werror -pedantic | FileCheck %s --check-prefix=X86 --check-prefix=X86_64
+// RUN: %clang_cc1 %s -ffreestanding -triple=i386-unknown-unknown -target-feature +ptwrite -emit-llvm -o - -Wall -Werror -pedantic | FileCheck %s --check-prefix=X86
+
+#include <x86intrin.h>
+
+#include <stdint.h>
+
+void test_ptwrite32(uint32_t value) {
+  //X86-LABEL: @test_ptwrite32
+  //X86: call void @llvm.x86.ptwrite32(i32 %{{.*}})
+  _ptwrite32(value);
+}
+
+#ifdef __x86_64__
+
+void test_ptwrite64(uint64_t value) {
+  //X86_64-LABEL: @test_ptwrite64
+  //X86_64: call void @llvm.x86.ptwrite64(i64 %{{.*}})
+  _ptwrite64(value);
+}
+
+#endif /* __x86_64__ */
Index: test/Driver/x86-target-features.c
===================================================================
--- test/Driver/x86-target-features.c
+++ test/Driver/x86-target-features.c
@@ -164,3 +164,8 @@
 // RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mno-pconfig %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-PCONFIG %s
 // PCONFIG: "-target-feature" "+pconfig"
 // NO-PCONFIG: "-target-feature" "-pconfig"
+
+// RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mptwrite %s -### -o %t.o 2>&1 | FileCheck -check-prefix=PTWRITE %s
+// RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mno-ptwrite %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-PTWRITE %s
+// PTWRITE: "-target-feature" "+ptwrite"
+// NO-PTWRITE: "-target-feature" "-ptwrite"
Index: test/Preprocessor/predefined-arch-macros.c
===================================================================
--- test/Preprocessor/predefined-arch-macros.c
+++ test/Preprocessor/predefined-arch-macros.c
@@ -1402,6 +1402,7 @@
 // CHECK_GLMP_M32: #define __PCLMUL__ 1
 // CHECK_GLMP_M32: #define __POPCNT__ 1
 // CHECK_GLMP_M32: #define __PRFCHW__ 1
+// CHECK_GLMP_M32: #define __PTWRITE__ 1
 // CHECK_GLMP_M32: #define __RDPID__ 1
 // CHECK_GLMP_M32: #define __RDRND__ 1
 // CHECK_GLMP_M32: #define __RDSEED__ 1
@@ -1437,6 +1438,7 @@
 // CHECK_GLMP_M64: #define __PCLMUL__ 1
 // CHECK_GLMP_M64: #define __POPCNT__ 1
 // CHECK_GLMP_M64: #define __PRFCHW__ 1
+// CHECK_GLMP_M64: #define __PTWRITE__ 1
 // CHECK_GLMP_M64: #define __RDPID__ 1
 // CHECK_GLMP_M64: #define __RDRND__ 1
 // CHECK_GLMP_M64: #define __RDSEED__ 1
@@ -1474,6 +1476,7 @@
 // CHECK_TRM_M32: #define __PCLMUL__ 1
 // CHECK_TRM_M32: #define __POPCNT__ 1
 // CHECK_TRM_M32: #define __PRFCHW__ 1
+// CHECK_TRM_M32: #define __PTWRITE__ 1
 // CHECK_TRM_M32: #define __RDPID__ 1
 // CHECK_TRM_M32: #define __RDRND__ 1
 // CHECK_TRM_M32: #define __RDSEED__ 1
@@ -1514,6 +1517,7 @@
 // CHECK_TRM_M64: #define __PCLMUL__ 1
 // CHECK_TRM_M64: #define __POPCNT__ 1
 // CHECK_TRM_M64: #define __PRFCHW__ 1
+// CHECK_TRM_M64: #define __PTWRITE__ 1
 // CHECK_TRM_M64: #define __RDPID__ 1
 // CHECK_TRM_M64: #define __RDRND__ 1
 // CHECK_TRM_M64: #define __RDSEED__ 1