diff --git a/llvm/lib/TextAPI/MachO/Architecture.cpp b/llvm/lib/TextAPI/MachO/Architecture.cpp
new file mode 100644
index 0000000..e9d3e9e
--- /dev/null
+++ b/llvm/lib/TextAPI/MachO/Architecture.cpp
@@ -0,0 +1,77 @@
+//===- Architecture.cpp ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the architecture helper functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/BinaryFormat/MachO.h"
+
+namespace llvm {
+namespace MachO {
+
+Architecture getArchitectureFromCpuType(uint32_t CPUType, uint32_t CPUSubType) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  if (CPUType == (Type) &&                                                     \
+      (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) == (Subtype))                    \
+    return Architecture::Arch;
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+
+  return Architecture::unknown;
+}
+
+Architecture getArchitectureFromName(StringRef Name) {
+  return StringSwitch<Architecture>(Name)
+#define ARCHINFO(Arch, Type, Subtype) .Case(#Arch, Architecture::Arch)
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+      .Default(Architecture::unknown);
+}
+
+StringRef getArchitectureName(Architecture Arch) {
+  switch (Arch) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  case Architecture::Arch:                                                     \
+    return #Arch;
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+  case Architecture::unknown:
+    return "unknown";
+  }
+
+  // Appease some compilers that cannot figure out that this is a fully covered
+  // switch statement.
+  return "unknown";
+}
+
+std::pair<uint32_t, uint32_t> getCPUTypeFromArchitecture(Architecture Arch) {
+  switch (Arch) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  case Architecture::Arch:                                                     \
+    return std::make_pair(Type, Subtype);
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+  case Architecture::unknown:
+    return std::make_pair(0, 0);
+  }
+
+  // Appease some compilers that cannot figure out that this is a fully covered
+  // switch statement.
+  return std::make_pair(0, 0);
+}
+
+raw_ostream &operator<<(raw_ostream &OS, Architecture Arch) {
+  OS << getArchitectureName(Arch);
+  return OS;
+}
+
+} // end namespace MachO.
+} // end namespace llvm.