Index: include/llvm/Support/TargetParser.h
===================================================================
--- include/llvm/Support/TargetParser.h
+++ include/llvm/Support/TargetParser.h
@@ -117,6 +117,7 @@
     AK_ARMV7L,
     AK_ARMV7HL,
     AK_ARMV7S,
+    AK_ARMV7K,
     AK_LAST
   };
 
Index: lib/Support/TargetParser.cpp
===================================================================
--- lib/Support/TargetParser.cpp
+++ lib/Support/TargetParser.cpp
@@ -107,7 +107,8 @@
   { "armv7",     ARM::AK_ARMV7,    "7",       "v7",    ARMBuildAttrs::CPUArch::v7 },
   { "armv7l",    ARM::AK_ARMV7L,   "7-L",     "v7l",   ARMBuildAttrs::CPUArch::v7 },
   { "armv7hl",   ARM::AK_ARMV7HL,  "7-L",     "v7hl",  ARMBuildAttrs::CPUArch::v7 },
-  { "armv7s",    ARM::AK_ARMV7S,   "7-S",     "v7s",   ARMBuildAttrs::CPUArch::v7 }
+  { "armv7s",    ARM::AK_ARMV7S,   "7-S",     "v7s",   ARMBuildAttrs::CPUArch::v7 },
+  { "armv7k",    ARM::AK_ARMV7K,   "7-K",     "v7k",   ARMBuildAttrs::CPUArch::v7 }
 };
 // List of Arch Extension names.
 // FIXME: TableGen this.
@@ -662,6 +663,7 @@
   case ARM::AK_ARMV7HL:
   case ARM::AK_ARMV7S:
   case ARM::AK_ARMV7EM:
+  case ARM::AK_ARMV7K:
     return 7;
   case ARM::AK_ARMV8A:
   case ARM::AK_ARMV8_1A:
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -32,6 +32,7 @@
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MachO.h"
+#include "llvm/Support/TargetParser.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
@@ -743,6 +744,39 @@
   }
 }
 
+static MachO::CPUSubTypeARM getMachOSubTypeFromArch(StringRef Arch) {
+  unsigned AK = ARMTargetParser::parseArch(Arch);
+  switch (AK) {
+  default:
+    return MachO::CPU_SUBTYPE_ARM_V7;
+  case ARM::AK_ARMV4T:
+    return MachO::CPU_SUBTYPE_ARM_V4T;
+  case ARM::AK_ARMV6:
+  case ARM::AK_ARMV6K:
+    return MachO::CPU_SUBTYPE_ARM_V6;
+  case ARM::AK_ARMV5:
+    return MachO::CPU_SUBTYPE_ARM_V5;
+  case ARM::AK_ARMV5T:
+  case ARM::AK_ARMV5E:
+  case ARM::AK_ARMV5TE:
+  case ARM::AK_ARMV5TEJ:
+    return MachO::CPU_SUBTYPE_ARM_V5TEJ;
+  case ARM::AK_ARMV7:
+    return MachO::CPU_SUBTYPE_ARM_V7;
+  case ARM::AK_ARMV7S:
+    return MachO::CPU_SUBTYPE_ARM_V7S;
+  case ARM::AK_ARMV7K:
+    return MachO::CPU_SUBTYPE_ARM_V7K;
+  case ARM::AK_ARMV6M:
+  case ARM::AK_ARMV6SM:
+    return MachO::CPU_SUBTYPE_ARM_V6M;
+  case ARM::AK_ARMV7M:
+    return MachO::CPU_SUBTYPE_ARM_V7M;
+  case ARM::AK_ARMV7EM:
+    return MachO::CPU_SUBTYPE_ARM_V7EM;
+  }
+}
+
 MCAsmBackend *llvm::createARMAsmBackend(const Target &T,
                                         const MCRegisterInfo &MRI,
                                         const Triple &TheTriple, StringRef CPU,
@@ -751,18 +785,7 @@
   default:
     llvm_unreachable("unsupported object format");
   case Triple::MachO: {
-    MachO::CPUSubTypeARM CS =
-        StringSwitch<MachO::CPUSubTypeARM>(TheTriple.getArchName())
-            .Cases("armv4t", "thumbv4t", MachO::CPU_SUBTYPE_ARM_V4T)
-            .Cases("armv5e", "thumbv5e", MachO::CPU_SUBTYPE_ARM_V5TEJ)
-            .Cases("armv6", "thumbv6", MachO::CPU_SUBTYPE_ARM_V6)
-            .Cases("armv6m", "thumbv6m", MachO::CPU_SUBTYPE_ARM_V6M)
-            .Cases("armv7em", "thumbv7em", MachO::CPU_SUBTYPE_ARM_V7EM)
-            .Cases("armv7k", "thumbv7k", MachO::CPU_SUBTYPE_ARM_V7K)
-            .Cases("armv7m", "thumbv7m", MachO::CPU_SUBTYPE_ARM_V7M)
-            .Cases("armv7s", "thumbv7s", MachO::CPU_SUBTYPE_ARM_V7S)
-            .Default(MachO::CPU_SUBTYPE_ARM_V7);
-
+    MachO::CPUSubTypeARM CS = getMachOSubTypeFromArch(TheTriple.getArchName());
     return new ARMAsmBackendDarwin(T, TheTriple, CS);
   }
   case Triple::COFF:
Index: test/CodeGen/ARM/MachO-subtypes.ll
===================================================================
--- /dev/null
+++ test/CodeGen/ARM/MachO-subtypes.ll
@@ -0,0 +1,68 @@
+; Check that MachO ARM CPU Subtypes are respected
+
+; RUN: llc -mtriple=armv4t-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V4T
+
+; RUN: llc -mtriple=armv5-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V5
+; RUN: llc -mtriple=armv5e-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V5
+; RUN: llc -mtriple=armv5t-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V5
+; RUN: llc -mtriple=armv5te-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V5
+; RUN: llc -mtriple=armv5tej-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V5
+
+; RUN: llc -mtriple=armv6-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6
+; RUN: llc -mtriple=armv6k-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6
+; RUN: llc -mtriple=thumbv6-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6
+; RUN: llc -mtriple=thumbv6k-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6
+
+; RUN: llc -mtriple=armv6m-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6M
+; RUN: llc -mtriple=thumbv6m-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V6M
+
+; RUN: llc -mtriple=armv7-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7
+; RUN: llc -mtriple=thumbv7-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7
+
+; RUN: llc -mtriple=thumbv7em-apple-darwin -mcpu=cortex-m4 -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7EM
+; RUN: llc -mtriple=thumbv7em-apple-darwin -mcpu=cortex-m7 -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7EM
+
+; RUN: llc -mtriple=armv7k-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7K
+; RUN: llc -mtriple=thumbv7k-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7K
+
+; RUN: llc -mtriple=thumbv7m-apple-darwin -mcpu=sc300 -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7M
+; RUN: llc -mtriple=thumbv7m-apple-darwin -mcpu=cortex-m3 -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7M
+
+; RUN: llc -mtriple=armv7s-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7S
+; RUN: llc -mtriple=thumbv7s-apple-darwin -filetype=obj -o - < %s \
+; RUN: | llvm-readobj -file-headers | FileCheck %s --check-prefix=CHECK-V7S
+
+define void @_test() {
+  ret void
+}
+
+; CHECK-V4T:   CpuSubType: CPU_SUBTYPE_ARM_V4T (0x5)
+; CHECK-V5:   CpuSubType: CPU_SUBTYPE_ARM_V5 (0x7)
+; CHECK-V6:   CpuSubType: CPU_SUBTYPE_ARM_V6 (0x6)
+; CHECK-V6M:   CpuSubType: CPU_SUBTYPE_ARM_V6M (0xE)
+; CHECK-V7:   CpuSubType: CPU_SUBTYPE_ARM_V7 (0x9)
+; CHECK-V7EM:   CpuSubType: CPU_SUBTYPE_ARM_V7EM (0x10)
+; CHECK-V7K:   CpuSubType: CPU_SUBTYPE_ARM_V7K (0xC)
+; CHECK-V7M:   CpuSubType: CPU_SUBTYPE_ARM_V7M (0xF)
+; CHECK-V7S:   CpuSubType: CPU_SUBTYPE_ARM_V7S (0xB)