diff --git a/clang/lib/Sema/OpenCLBuiltins.td b/clang/lib/Sema/OpenCLBuiltins.td
index 1a58747c40176e..0e10722eee342a 100644
--- a/clang/lib/Sema/OpenCLBuiltins.td
+++ b/clang/lib/Sema/OpenCLBuiltins.td
@@ -58,6 +58,7 @@ def FuncExtKhrSubgroupBallot             : FunctionExtension<"cl_khr_subgroup_ba
 def FuncExtKhrSubgroupNonUniformArithmetic: FunctionExtension<"cl_khr_subgroup_non_uniform_arithmetic">;
 def FuncExtKhrSubgroupShuffle            : FunctionExtension<"cl_khr_subgroup_shuffle">;
 def FuncExtKhrSubgroupShuffleRelative    : FunctionExtension<"cl_khr_subgroup_shuffle_relative">;
+def FuncExtKhrSubgroupClusteredReduce    : FunctionExtension<"cl_khr_subgroup_clustered_reduce">;
 def FuncExtKhrGlobalInt32BaseAtomics     : FunctionExtension<"cl_khr_global_int32_base_atomics">;
 def FuncExtKhrGlobalInt32ExtendedAtomics : FunctionExtension<"cl_khr_global_int32_extended_atomics">;
 def FuncExtKhrLocalInt32BaseAtomics      : FunctionExtension<"cl_khr_local_int32_base_atomics">;
@@ -1551,7 +1552,17 @@ let Extension = FuncExtKhrSubgroupShuffleRelative in {
 }
 
 // Section 38.10.1 - cl_khr_subgroup_clustered_reduce
-// TODO
+let Extension = FuncExtKhrSubgroupClusteredReduce in {
+  foreach op = ["add", "min", "max", "mul"] in {
+    def : Builtin<"sub_group_clustered_reduce_" # op, [AGenType1, AGenType1, UInt]>;
+  }
+  foreach op = ["and", "or", "xor"] in {
+    def : Builtin<"sub_group_clustered_reduce_" # op, [AIGenType1, AIGenType1, UInt]>;
+  }
+  foreach op = ["and", "or", "xor"] in {
+    def : Builtin<"sub_group_clustered_reduce_logical_" # op, [Int, Int, UInt]>;
+  }
+}
 
 //--------------------------------------------------------------------
 // Arm extensions.
diff --git a/clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl b/clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl
index 93dd6fcc0a0d38..6b9be37eadaf7c 100644
--- a/clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl
+++ b/clang/test/SemaOpenCL/fdeclare-opencl-builtins.cl
@@ -38,6 +38,7 @@ typedef long long2 __attribute__((ext_vector_type(2)));
 #if (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ >= 200)
 #define cl_khr_subgroup_ballot 1
 #define cl_khr_subgroup_non_uniform_arithmetic 1
+#define cl_khr_subgroup_clustered_reduce 1
 #endif
 #endif
 
@@ -144,10 +145,12 @@ kernel void basic_subgroup(global uint *out) {
 kernel void extended_subgroup(global uint4 *out, global int *scalar) {
   out[0] = get_sub_group_eq_mask();
   scalar[0] = sub_group_non_uniform_scan_inclusive_or(3);
+  scalar[1] = sub_group_clustered_reduce_logical_xor(2, 4);
 #if __OPENCL_C_VERSION__ < CL_VERSION_2_0 && !defined(__OPENCL_CPP_VERSION__)
-  // expected-error@-3{{implicit declaration of function 'get_sub_group_eq_mask' is invalid in OpenCL}}
-  // expected-error@-4{{implicit conversion changes signedness}}
-  // expected-error@-4{{implicit declaration of function 'sub_group_non_uniform_scan_inclusive_or' is invalid in OpenCL}}
+  // expected-error@-4{{implicit declaration of function 'get_sub_group_eq_mask' is invalid in OpenCL}}
+  // expected-error@-5{{implicit conversion changes signedness}}
+  // expected-error@-5{{implicit declaration of function 'sub_group_non_uniform_scan_inclusive_or' is invalid in OpenCL}}
+  // expected-error@-5{{implicit declaration of function 'sub_group_clustered_reduce_logical_xor' is invalid in OpenCL}}
 #endif
 }