diff --git a/clang/lib/Headers/cetintrin.h b/clang/lib/Headers/cetintrin.h
--- a/clang/lib/Headers/cetintrin.h
+++ b/clang/lib/Headers/cetintrin.h
@@ -43,8 +43,11 @@
 }
 
 static __inline__ unsigned int __DEFAULT_FN_ATTRS _rdsspd_i32() {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wuninitialized"
   unsigned int t;
   return __builtin_ia32_rdsspd(t);
+#pragma clang diagnostic pop
 }
 
 #ifdef __x86_64__
@@ -53,8 +56,11 @@
 }
 
 static __inline__ unsigned long long __DEFAULT_FN_ATTRS _rdsspq_i64() {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wuninitialized"
   unsigned long long t;
   return __builtin_ia32_rdsspq(t);
+#pragma clang diagnostic pop
 }
 #endif /* __x86_64__ */
 
diff --git a/clang/test/CodeGen/X86/sse-builtins-constrained.c b/clang/test/CodeGen/X86/sse-builtins-constrained.c
--- a/clang/test/CodeGen/X86/sse-builtins-constrained.c
+++ b/clang/test/CodeGen/X86/sse-builtins-constrained.c
@@ -1,8 +1,8 @@
 // REQUIRES: x86-registered-target
 // RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=UNCONSTRAINED --check-prefix=COMMON --check-prefix=COMMONIR
 // RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -ffp-exception-behavior=maytrap -DSTRICT=1 -emit-llvm -o - -Wall -Werror | FileCheck %s --check-prefix=CONSTRAINED --check-prefix=COMMON --check-prefix=COMMONIR
-// RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -S %s -o - -Wall -Werror | FileCheck %s --check-prefix=CHECK-ASM --check-prefix=COMMON
-// RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -ffp-exception-behavior=maytrap -DSTRICT=1 -S %s -o - -Wall -Werror | FileCheck %s --check-prefix=CHECK-ASM --check-prefix=COMMON
+// RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -S -o - -Wall -Werror | FileCheck %s --check-prefix=CHECK-ASM --check-prefix=COMMON
+// RUN: %clang_cc1 -ffreestanding %s -triple=x86_64-unknown-linux-gnu -target-feature +sse -ffp-exception-behavior=maytrap -DSTRICT=1 -S -o - -Wall -Werror | FileCheck %s --check-prefix=CHECK-ASM --check-prefix=COMMON
 
 #ifdef STRICT
 // Test that the constrained intrinsics are picking up the exception