diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -514,9 +514,6 @@
   case CK_K8:
   case CK_K8SSE3:
   case CK_x86_64:
-  case CK_x86_64_v2:
-  case CK_x86_64_v3:
-  case CK_x86_64_v4:
     defineCPUMacros(Builder, "k8");
     break;
   case CK_AMDFAM10: