Index: docs/yaml2obj.rst
===================================================================
--- docs/yaml2obj.rst
+++ docs/yaml2obj.rst
@@ -65,6 +65,7 @@
                                  , IMAGE_FILE_MACHINE_AMD64
                                  , IMAGE_FILE_MACHINE_ARM
                                  , IMAGE_FILE_MACHINE_ARMNT
+                                 , IMAGE_FILE_MACHINE_ARM64
                                  , IMAGE_FILE_MACHINE_EBC
                                  , IMAGE_FILE_MACHINE_I386
                                  , IMAGE_FILE_MACHINE_IA64
Index: include/llvm/Support/COFF.h
===================================================================
--- include/llvm/Support/COFF.h
+++ include/llvm/Support/COFF.h
@@ -88,6 +88,7 @@
     IMAGE_FILE_MACHINE_AMD64     = 0x8664,
     IMAGE_FILE_MACHINE_ARM       = 0x1C0,
     IMAGE_FILE_MACHINE_ARMNT     = 0x1C4,
+    IMAGE_FILE_MACHINE_ARM64     = 0xAA64,
     IMAGE_FILE_MACHINE_EBC       = 0xEBC,
     IMAGE_FILE_MACHINE_I386      = 0x14C,
     IMAGE_FILE_MACHINE_IA64      = 0x200,
Index: lib/Object/COFFYAML.cpp
===================================================================
--- lib/Object/COFFYAML.cpp
+++ lib/Object/COFFYAML.cpp
@@ -56,6 +56,7 @@
   ECase(IMAGE_FILE_MACHINE_AMD64);
   ECase(IMAGE_FILE_MACHINE_ARM);
   ECase(IMAGE_FILE_MACHINE_ARMNT);
+  ECase(IMAGE_FILE_MACHINE_ARM64);
   ECase(IMAGE_FILE_MACHINE_EBC);
   ECase(IMAGE_FILE_MACHINE_I386);
   ECase(IMAGE_FILE_MACHINE_IA64);
Index: tools/llvm-readobj/COFFDumper.cpp
===================================================================
--- tools/llvm-readobj/COFFDumper.cpp
+++ tools/llvm-readobj/COFFDumper.cpp
@@ -153,6 +153,7 @@
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_AMD64    ),
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_ARM      ),
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_ARMNT    ),
+  LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_ARM64    ),
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_EBC      ),
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_I386     ),
   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_IA64     ),