Index: lib/Basic/Targets/X86.h
===================================================================
--- lib/Basic/Targets/X86.h
+++ lib/Basic/Targets/X86.h
@@ -203,6 +203,10 @@
     /// Knights Landing processor.
     CK_KNL,
 
+    /// \name Knights Mill
+    /// Knights Mill processor.
+    CK_KNM,
+
     /// \name Lakemont
     /// Lakemont microarchitecture based processors.
     CK_Lakemont,
@@ -321,6 +325,7 @@
     case CK_SkylakeServer:
     case CK_Cannonlake:
     case CK_KNL:
+    case CK_KNM:
     case CK_K8:
     case CK_K8SSE3:
     case CK_AMDFAM10:
Index: lib/Basic/Targets/X86.cpp
===================================================================
--- lib/Basic/Targets/X86.cpp
+++ lib/Basic/Targets/X86.cpp
@@ -229,6 +229,7 @@
     setFeatureEnabledImpl(Features, "cx16", true);
     break;
 
+  case CK_KNM:
   case CK_KNL:
     setFeatureEnabledImpl(Features, "avx512f", true);
     setFeatureEnabledImpl(Features, "avx512cd", true);
@@ -853,6 +854,9 @@
   case CK_KNL:
     defineCPUMacros(Builder, "knl");
     break;
+  case CK_KNM:
+    defineCPUMacros(Builder, "knm");
+    break;
   case CK_Lakemont:
     Builder.defineMacro("__tune_lakemont__");
     break;
@@ -1552,6 +1556,7 @@
       .Cases("skylake-avx512", "skx", CK_SkylakeServer)
       .Case("cannonlake", CK_Cannonlake)
       .Case("knl", CK_KNL)
+      .Case("knm", CK_KNM)
       .Case("lakemont", CK_Lakemont)
       .Case("k6", CK_K6)
       .Case("k6-2", CK_K6_2)
Index: test/Driver/x86-march.c
===================================================================
--- test/Driver/x86-march.c
+++ test/Driver/x86-march.c
@@ -52,6 +52,10 @@
 // RUN:   | FileCheck %s -check-prefix=knl
 // knl: "-target-cpu" "knl"
 //
+// RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=knm 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=knm
+// knm: "-target-cpu" "knm"
+//
 // RUN: %clang -target x86_64-unknown-unknown -c -### %s -march=cannonlake 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=cannonlake
 // cannonlake: "-target-cpu" "cannonlake"
Index: test/Preprocessor/predefined-arch-macros.c
===================================================================
--- test/Preprocessor/predefined-arch-macros.c
+++ test/Preprocessor/predefined-arch-macros.c
@@ -783,6 +783,81 @@
 // CHECK_KNL_M64: #define __tune_knl__ 1
 // CHECK_KNL_M64: #define __x86_64 1
 // CHECK_KNL_M64: #define __x86_64__ 1
+
+// RUN: %clang -march=knm -m32 -E -dM %s -o - 2>&1 \
+// RUN:     -target i386-unknown-linux \
+// RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_KNM_M32
+// CHECK_KNM_M32: #define __AES__ 1
+// CHECK_KNM_M32: #define __AVX2__ 1
+// CHECK_KNM_M32: #define __AVX512CD__ 1
+// CHECK_KNM_M32: #define __AVX512ER__ 1
+// CHECK_KNM_M32: #define __AVX512F__ 1
+// CHECK_KNM_M32: #define __AVX512PF__ 1
+// CHECK_KNM_M32: #define __AVX__ 1
+// CHECK_KNM_M32: #define __BMI2__ 1
+// CHECK_KNM_M32: #define __BMI__ 1
+// CHECK_KNM_M32: #define __F16C__ 1
+// CHECK_KNM_M32: #define __FMA__ 1
+// CHECK_KNM_M32: #define __LZCNT__ 1
+// CHECK_KNM_M32: #define __MMX__ 1
+// CHECK_KNM_M32: #define __PCLMUL__ 1
+// CHECK_KNM_M32: #define __POPCNT__ 1
+// CHECK_KNM_M32: #define __PREFETCHWT1__ 1
+// CHECK_KNM_M32: #define __RDRND__ 1
+// CHECK_KNM_M32: #define __RTM__ 1
+// CHECK_KNM_M32: #define __SSE2__ 1
+// CHECK_KNM_M32: #define __SSE3__ 1
+// CHECK_KNM_M32: #define __SSE4_1__ 1
+// CHECK_KNM_M32: #define __SSE4_2__ 1
+// CHECK_KNM_M32: #define __SSE__ 1
+// CHECK_KNM_M32: #define __SSSE3__ 1
+// CHECK_KNM_M32: #define __XSAVEOPT__ 1
+// CHECK_KNM_M32: #define __XSAVE__ 1
+// CHECK_KNM_M32: #define __i386 1
+// CHECK_KNM_M32: #define __i386__ 1
+// CHECK_KNM_M32: #define __knm 1
+// CHECK_KNM_M32: #define __knm__ 1
+// CHECK_KNM_M32: #define __tune_knm__ 1
+// CHECK_KNM_M32: #define i386 1
+
+// RUN: %clang -march=knm -m64 -E -dM %s -o - 2>&1 \
+// RUN:     -target i386-unknown-linux \
+// RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_KNM_M64
+// CHECK_KNM_M64: #define __AES__ 1
+// CHECK_KNM_M64: #define __AVX2__ 1
+// CHECK_KNM_M64: #define __AVX512CD__ 1
+// CHECK_KNM_M64: #define __AVX512ER__ 1
+// CHECK_KNM_M64: #define __AVX512F__ 1
+// CHECK_KNM_M64: #define __AVX512PF__ 1
+// CHECK_KNM_M64: #define __AVX__ 1
+// CHECK_KNM_M64: #define __BMI2__ 1
+// CHECK_KNM_M64: #define __BMI__ 1
+// CHECK_KNM_M64: #define __F16C__ 1
+// CHECK_KNM_M64: #define __FMA__ 1
+// CHECK_KNM_M64: #define __LZCNT__ 1
+// CHECK_KNM_M64: #define __MMX__ 1
+// CHECK_KNM_M64: #define __PCLMUL__ 1
+// CHECK_KNM_M64: #define __POPCNT__ 1
+// CHECK_KNM_M64: #define __PREFETCHWT1__ 1
+// CHECK_KNM_M64: #define __RDRND__ 1
+// CHECK_KNM_M64: #define __RTM__ 1
+// CHECK_KNM_M64: #define __SSE2_MATH__ 1
+// CHECK_KNM_M64: #define __SSE2__ 1
+// CHECK_KNM_M64: #define __SSE3__ 1
+// CHECK_KNM_M64: #define __SSE4_1__ 1
+// CHECK_KNM_M64: #define __SSE4_2__ 1
+// CHECK_KNM_M64: #define __SSE_MATH__ 1
+// CHECK_KNM_M64: #define __SSE__ 1
+// CHECK_KNM_M64: #define __SSSE3__ 1
+// CHECK_KNM_M64: #define __XSAVEOPT__ 1
+// CHECK_KNM_M64: #define __XSAVE__ 1
+// CHECK_KNM_M64: #define __amd64 1
+// CHECK_KNM_M64: #define __amd64__ 1
+// CHECK_KNM_M64: #define __knm 1
+// CHECK_KNM_M64: #define __knm__ 1
+// CHECK_KNM_M64: #define __tune_knm__ 1
+// CHECK_KNM_M64: #define __x86_64 1
+// CHECK_KNM_M64: #define __x86_64__ 1
 //
 // RUN: %clang -march=skylake-avx512 -m32 -E -dM %s -o - 2>&1 \
 // RUN:     -target i386-unknown-linux \