diff --git a/clang/lib/Basic/Targets/PPC.cpp b/clang/lib/Basic/Targets/PPC.cpp
--- a/clang/lib/Basic/Targets/PPC.cpp
+++ b/clang/lib/Basic/Targets/PPC.cpp
@@ -317,6 +317,9 @@
                         .Case("pwr9", true)
                         .Case("pwr8", true)
                         .Default(false);
+  Features["float128"] = llvm::StringSwitch<bool>(CPU)
+                        .Case("pwr9", true)
+                        .Default(false);
 
   Features["spe"] = llvm::StringSwitch<bool>(CPU)
                         .Case("8548", true)
diff --git a/clang/test/Driver/ppc-f128-support-check.c b/clang/test/Driver/ppc-f128-support-check.c
--- a/clang/test/Driver/ppc-f128-support-check.c
+++ b/clang/test/Driver/ppc-f128-support-check.c
@@ -1,7 +1,7 @@
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=pwr9 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
+// RUN:   -mcpu=pwr9 %s 2>&1 | FileCheck %s --check-prefix=HASF128
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=power9 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
+// RUN:   -mcpu=power9 %s 2>&1 | FileCheck %s --check-prefix=HASF128
 
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
 // RUN:   -mcpu=pwr8 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128