diff --git a/llvm/include/llvm/BinaryFormat/MachO.h b/llvm/include/llvm/BinaryFormat/MachO.h
--- a/llvm/include/llvm/BinaryFormat/MachO.h
+++ b/llvm/include/llvm/BinaryFormat/MachO.h
@@ -1477,7 +1477,11 @@
   CPU_SUBTYPE_ARM_V7EM = 16
 };
 
-enum CPUSubTypeARM64 { CPU_SUBTYPE_ARM64_ALL = 0 };
+enum CPUSubTypeARM64 {
+  CPU_SUBTYPE_ARM64_ALL = 0,
+  CPU_SUBTYPE_ARM64_V8 = 1,
+  CPU_SUBTYPE_ARM64E = 2,
+};
 
 enum CPUSubTypeSPARC { CPU_SUBTYPE_SPARC_ALL = 0 };