diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -536,6 +536,4 @@
 
 def err_aix_default_altivec_abi : Error<
   "The default Altivec ABI on AIX is not yet supported, use '-mabi=vec-extabi' for the extended Altivec ABI">;
-
-def err_aix_altivec : Error<"'-mabi=vec-extabi' and '-mabi=vec-default' require '-maltivec'">;
 }
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4666,8 +4666,8 @@
     if (!Triple.isOSAIX())
       D.Diag(diag::err_drv_unsupported_opt_for_target)
           << A->getSpelling() << RawTriple.str();
-    if (!Args.hasArg(options::OPT_maltivec))
-      D.Diag(diag::err_aix_altivec);
+    if (Args.hasArg(options::OPT_mabi_EQ_vec_default))
+      D.Diag(diag::err_aix_default_altivec_abi);
   }
 
   if (Arg *A = Args.getLastArg(options::OPT_Wframe_larger_than_EQ)) {
diff --git a/clang/test/CodeGen/altivec.c b/clang/test/CodeGen/altivec.c
--- a/clang/test/CodeGen/altivec.c
+++ b/clang/test/CodeGen/altivec.c
@@ -2,23 +2,17 @@
 // RUN: %clang_cc1 -target-feature +altivec -triple powerpcle-unknown-unknown -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-LE
 // RUN: %clang_cc1 -target-feature +altivec -triple powerpc64-unknown-unknown -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
 // RUN: %clang_cc1 -target-feature +altivec -triple powerpc64le-unknown-unknown -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-LE
-// RUN: %clang_cc1 -target-feature +altivec -mabi=vec-extabi -triple powerpc-unknown-aix -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
-// RUN: %clang_cc1 -target-feature +altivec -mabi=vec-extabi -triple powerpc64-unknown-aix -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
-// RUN: not %clang_cc1 -target-feature +altivec -mabi=vec-default -triple powerpc-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
-// RUN: not %clang_cc1 -target-feature +altivec -mabi=vec-default -triple powerpc64-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
+// RUN: %clang_cc1 -target-feature +altivec -mabi=vec-extabi -target-cpu pwr8 -triple powerpc-unknown-aix -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
+// RUN: %clang_cc1 -target-feature +altivec -mabi=vec-extabi -target-cpu pwr8 -triple powerpc64-unknown-aix -emit-llvm %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
+// RUN: not %clang_cc1 -target-feature +altivec -mabi=vec-default -target-cpu pwr8 -triple powerpc-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
+// RUN: not %clang_cc1 -target-feature +altivec -mabi=vec-default -target-cpu pwr8 -triple powerpc64-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
  
-// RUN: %clang -S -emit-llvm -maltivec -mabi=vec-extabi -target powerpc-unknown-aix %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
-// RUN: not %clang -S -emit-llvm -maltivec -target powerpc-unknown-aix %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
-// RUN: not %clang -S -emit-llvm -maltivec -target powerpc64-unknown-aix %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR 
-// RUN: not %clang -S -emit-llvm -mabi=vec-default -target powerpc-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -emit-llvm -mabi=vec-extabi -target powerpc-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: %clang -S -emit-llvm -maltivec -mabi=vec-extabi -target powerpc64-unknown-aix %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
-// RUN: not %clang -S -emit-llvm -mabi=vec-default -target powerpc64-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -emit-llvm -mabi=vec-extabi -target powerpc64-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -mabi=vec-default -target powerpc-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -mabi=vec-extabi -target powerpc-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -mabi=vec-default -target powerpc64-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
-// RUN: not %clang -S -mabi=vec-extabi -target powerpc64-unknown-aix %s 2>&1  | FileCheck  %s --check-prefix=AIX-ATVER
+// RUN: not %clang -S -emit-llvm -maltivec -mcpu=pwr8 -target powerpc-unknown-aix %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
+// RUN: not %clang -S -emit-llvm -maltivec -mcpu=pwr8 -target powerpc64-unknown-aix %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR 
+// RUN: %clang -S -emit-llvm -maltivec -mabi=vec-extabi -mcpu=pwr8 -target powerpc-unknown-aix %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
+// RUN: %clang -S -emit-llvm -maltivec -mabi=vec-extabi -mcpu=pwr8 -target powerpc64-unknown-aix %s -o - | FileCheck %s --check-prefixes=CHECK,CHECK-BE
+// RUN: not %clang -S -emit-llvm -maltivec -mabi=vec-default -mcpu=pwr8 -triple powerpc-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
+// RUN: not %clang -S -emit-llvm -maltivec -mabi=vec-default -mcpu=pwr8 -triple powerpc64-unknown-aix -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=AIX-ERROR
 // Check initialization
 
 vector int test0 = (vector int)(1);       // CHECK: @test0 ={{.*}} global <4 x i32> <i32 1, i32 1, i32 1, i32 1>
@@ -63,4 +57,3 @@
 }
 
 // AIX-ERROR:  error: The default Altivec ABI on AIX is not yet supported, use '-mabi=vec-extabi' for the extended Altivec ABI
-// AIX-ATVER:  error: '-mabi=vec-extabi' and '-mabi=vec-default' require '-maltivec'