Index: clang/lib/Basic/Targets/PPC.cpp
===================================================================
--- clang/lib/Basic/Targets/PPC.cpp
+++ clang/lib/Basic/Targets/PPC.cpp
@@ -318,8 +318,10 @@
                         .Case("pwr8", true)
                         .Default(false);
   Features["float128"] = llvm::StringSwitch<bool>(CPU)
-                        .Case("pwr9", true)
-                        .Default(false);
+                             .Case("ppc64le", true)
+                             .Case("pwr9", true)
+                             .Case("pwr8", true)
+                             .Default(false);
 
   Features["spe"] = llvm::StringSwitch<bool>(CPU)
                         .Case("8548", true)
@@ -343,9 +345,10 @@
   if (!ppcUserFeaturesCheck(Diags, FeaturesVec))
     return false;
 
-  if (!(ArchDefs & ArchDefinePwr9) && (ArchDefs & ArchDefinePpcgr) &&
+  if (!(ArchDefs & (ArchDefinePwr9 | ArchDefinePwr8)) &&
+      (ArchDefs & ArchDefinePpcgr) &&
       llvm::find(FeaturesVec, "+float128") != FeaturesVec.end()) {
-    // We have __float128 on PPC but not power 9 and above.
+    // We have __float128 on PPC but not power 8 and above.
     Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfloat128" << CPU;
     return false;
   }
Index: clang/test/Driver/ppc-f128-support-check.c
===================================================================
--- clang/test/Driver/ppc-f128-support-check.c
+++ clang/test/Driver/ppc-f128-support-check.c
@@ -2,13 +2,15 @@
 // RUN:   -mcpu=pwr9 %s 2>&1 | FileCheck %s --check-prefix=HASF128
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
 // 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
+// RUN:   -mcpu=pwr8 %s 2>&1 | FileCheck %s --check-prefix=HASF128
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mcpu=pwr7 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
+// RUN:   -mcpu=power8 %s 2>&1 | FileCheck %s --check-prefix=HASF128
 // RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
-// RUN:   -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
+// RUN:   %s 2>&1 | FileCheck %s --check-prefix=HASF128
+
+// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
+// RUN:   -mcpu=pwr7 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
 
 #ifdef __FLOAT128__
 static_assert(false, "__float128 enabled");