diff --git a/clang/lib/Sema/DeclSpec.cpp b/clang/lib/Sema/DeclSpec.cpp
--- a/clang/lib/Sema/DeclSpec.cpp
+++ b/clang/lib/Sema/DeclSpec.cpp
@@ -1269,7 +1269,8 @@
       // Note that this intentionally doesn't include _Complex _Bool.
       if (!S.getLangOpts().CPlusPlus)
         S.Diag(TSTLoc, diag::ext_integer_complex);
-    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
+    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double &&
+               TypeSpecType != TST_float128) {
       S.Diag(TSCLoc, diag::err_invalid_complex_spec)
         << getSpecifierName((TST)TypeSpecType, Policy);
       TypeSpecComplex = TSC_unspecified;
diff --git a/clang/test/CodeGen/ppc64-complex-parms.c b/clang/test/CodeGen/ppc64-complex-parms.c
--- a/clang/test/CodeGen/ppc64-complex-parms.c
+++ b/clang/test/CodeGen/ppc64-complex-parms.c
@@ -1,8 +1,19 @@
+// REQUIRES: powerpc-registered-target
 // RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -target-feature +float128 -DTEST_F128 -triple \
+// RUN:   powerpc64le-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s \
+// RUN:   --check-prefix CHECK-F128
 
 float crealf(_Complex float);
 double creal(_Complex double);
 long double creall(_Complex long double);
+#ifdef TEST_F128
+__float128 crealf128(_Complex __float128);
+__float128 foo_f128(_Complex __float128 x) {
+  return crealf128(x);
+}
+// CHECK-F128: define fp128 @foo_f128(fp128 {{[%A-Za-z0-9.]+}}, fp128 {{[%A-Za-z0-9.]+}})
+#endif
 
 float foo_float(_Complex float x) {
   return crealf(x);
diff --git a/clang/test/CodeGen/ppc64-complex-return.c b/clang/test/CodeGen/ppc64-complex-return.c
--- a/clang/test/CodeGen/ppc64-complex-return.c
+++ b/clang/test/CodeGen/ppc64-complex-return.c
@@ -1,9 +1,20 @@
 // REQUIRES: powerpc-registered-target
 // RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -target-feature +float128 -DTEST_F128 -triple \
+// RUN:   powerpc64le-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s \
+// RUN:   --check-prefix CHECK-F128
 
 float crealf(_Complex float);
 double creal(_Complex double);
 long double creall(_Complex long double);
+#ifdef TEST_F128
+__float128 crealf128(_Complex __float128);
+_Complex __float128 foo_f128(_Complex __float128 x) {
+  return x;
+}
+
+// CHECK-F128: define { fp128, fp128 } @foo_f128(fp128 {{[%A-Za-z0-9.]+}}, fp128 {{[%A-Za-z0-9.]+}}) [[NUW:#[0-9]+]] {
+#endif
 
 _Complex float foo_float(_Complex float x) {
   return x;
@@ -80,6 +91,17 @@
 // CHECK: extractvalue { ppc_fp128, ppc_fp128 } [[VAR3]], 0
 // CHECK: extractvalue { ppc_fp128, ppc_fp128 } [[VAR3]], 1
 
+#ifdef TEST_F128
+__float128 bar_f128(void) {
+  return crealf128(foo_f128(2.0Q - 2.5Qi));
+}
+
+// CHECK-F128: define fp128 @bar_f128() [[NUW]] {
+// CHECK-F128: [[VAR3:[%A-Za-z0-9.]+]] = call { fp128, fp128 } @foo_f128
+// CHECK-F128: extractvalue { fp128, fp128 } [[VAR3]], 0
+// CHECK-F128: extractvalue { fp128, fp128 } [[VAR3]], 1
+#endif
+
 int bar_int(void) {
   return __real__(foo_int(2 - 3i));
 }