Index: clang/lib/Driver/ToolChains/Darwin.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Darwin.cpp
+++ clang/lib/Driver/ToolChains/Darwin.cpp
@@ -2000,16 +2000,9 @@
   llvm::Triple::OSType OSTy = llvm::Triple::UnknownOS;
 
   StringRef MachOArchName = Toolchain.getMachOArchName(Args);
-  if (MachOArchName == "arm64" || MachOArchName == "arm64e") {
-#if __arm64__
-    // A clang running on an Apple Silicon mac defaults
-    // to building for mac when building for arm64 rather than
-    // defaulting to iOS.
+  if (MachOArchName == "arm64" || MachOArchName == "arm64e")
     OSTy = llvm::Triple::MacOSX;
-#else
-    OSTy = llvm::Triple::IOS;
-#endif
-  } else if (MachOArchName == "armv7" || MachOArchName == "armv7s")
+  else if (MachOArchName == "armv7" || MachOArchName == "armv7s")
     OSTy = llvm::Triple::IOS;
   else if (MachOArchName == "armv7k" || MachOArchName == "arm64_32")
     OSTy = llvm::Triple::WatchOS;
Index: clang/test/Driver/apple-arm64-arch.c
===================================================================
--- clang/test/Driver/apple-arm64-arch.c
+++ clang/test/Driver/apple-arm64-arch.c
@@ -2,6 +2,5 @@
 // RUN:   FileCheck %s
 //
 // REQUIRES: system-darwin
-// XFAIL: apple-silicon-mac
 //
-// CHECK: "-triple" "arm64-apple-ios{{[0-9.]+}}"
+// CHECK: "-triple" "arm64-apple-macosx{{[0-9.]+}}"