diff --git a/clang/include/clang/Basic/BuiltinsPPC.def b/clang/include/clang/Basic/BuiltinsPPC.def
--- a/clang/include/clang/Basic/BuiltinsPPC.def
+++ b/clang/include/clang/Basic/BuiltinsPPC.def
@@ -322,6 +322,13 @@
 BUILTIN(__builtin_altivec_vmulhsd, "V2LLiV2LLiV2LLi", "")
 BUILTIN(__builtin_altivec_vmulhud, "V2ULLiV2ULLiV2ULLi", "")
 
+// P10 Vector Expand with Mask built-ins.
+BUILTIN(__builtin_altivec_vexpandbm, "V16UcV16Uc", "")
+BUILTIN(__builtin_altivec_vexpandhm, "V8UsV8Us", "")
+BUILTIN(__builtin_altivec_vexpandwm, "V4UiV4Ui", "")
+BUILTIN(__builtin_altivec_vexpanddm, "V2ULLiV2ULLi", "")
+BUILTIN(__builtin_altivec_vexpandqm, "V1ULLLiV1ULLLi", "")
+
 // P10 Vector Parallel Bits built-ins.
 BUILTIN(__builtin_altivec_vpdepd, "V2ULLiV2ULLiV2ULLi", "")
 BUILTIN(__builtin_altivec_vpextd, "V2ULLiV2ULLiV2ULLi", "")
diff --git a/clang/lib/Headers/altivec.h b/clang/lib/Headers/altivec.h
--- a/clang/lib/Headers/altivec.h
+++ b/clang/lib/Headers/altivec.h
@@ -17041,6 +17041,33 @@
   return __builtin_altivec_vextractqm(__a);
 }
 
+/* vec_expandm */
+
+static __inline__ vector unsigned char __ATTRS_o_ai
+vec_expandm(vector unsigned char __a) {
+  return __builtin_altivec_vexpandbm(__a);
+}
+
+static __inline__ vector unsigned short __ATTRS_o_ai
+vec_expandm(vector unsigned short __a) {
+  return __builtin_altivec_vexpandhm(__a);
+}
+
+static __inline__ vector unsigned int __ATTRS_o_ai
+vec_expandm(vector unsigned int __a) {
+  return __builtin_altivec_vexpandwm(__a);
+}
+
+static __inline__ vector unsigned long long __ATTRS_o_ai
+vec_expandm(vector unsigned long long __a) {
+  return __builtin_altivec_vexpanddm(__a);
+}
+
+static __inline__ vector unsigned __int128 __ATTRS_o_ai
+vec_expandm(vector unsigned __int128 __a) {
+  return __builtin_altivec_vexpandqm(__a);
+}
+
 /* vec_pdep */
 
 static __inline__ vector unsigned long long __ATTRS_o_ai
diff --git a/clang/test/CodeGen/builtins-ppc-p10vector.c b/clang/test/CodeGen/builtins-ppc-p10vector.c
--- a/clang/test/CodeGen/builtins-ppc-p10vector.c
+++ b/clang/test/CodeGen/builtins-ppc-p10vector.c
@@ -201,6 +201,36 @@
   return vec_cfuge(vulla, vullb);
 }
 
+vector unsigned char test_vec_expandm_uc(void) {
+  // CHECK: @llvm.ppc.altivec.vexpandbm(<16 x i8> %{{.+}})
+  // CHECK-NEXT: ret <16 x i8>
+  return vec_expandm(vuca);
+}
+
+vector unsigned short test_vec_expandm_us(void) {
+  // CHECK: @llvm.ppc.altivec.vexpandhm(<8 x i16> %{{.+}})
+  // CHECK-NEXT: ret <8 x i16>
+  return vec_expandm(vusa);
+}
+
+vector unsigned int test_vec_expandm_ui(void) {
+  // CHECK: @llvm.ppc.altivec.vexpandwm(<4 x i32> %{{.+}})
+  // CHECK-NEXT: ret <4 x i32>
+  return vec_expandm(vuia);
+}
+
+vector unsigned long long test_vec_expandm_ull(void) {
+  // CHECK: @llvm.ppc.altivec.vexpanddm(<2 x i64> %{{.+}})
+  // CHECK-NEXT: ret <2 x i64>
+  return vec_expandm(vulla);
+}
+
+vector unsigned __int128 test_vec_expandm_u128(void) {
+  // CHECK: @llvm.ppc.altivec.vexpandqm(<1 x i128> %{{.+}})
+  // CHECK-NEXT: ret <1 x i128>
+  return vec_expandm(vui128a);
+}
+
 unsigned long long test_vgnb_1(void) {
   // CHECK: @llvm.ppc.altivec.vgnb(<1 x i128> %{{.+}}, i32 2)
   // CHECK-NEXT: ret i64
diff --git a/llvm/include/llvm/IR/IntrinsicsPowerPC.td b/llvm/include/llvm/IR/IntrinsicsPowerPC.td
--- a/llvm/include/llvm/IR/IntrinsicsPowerPC.td
+++ b/llvm/include/llvm/IR/IntrinsicsPowerPC.td
@@ -455,6 +455,18 @@
   def int_ppc_altivec_vextractqm : GCCBuiltin<"__builtin_altivec_vextractqm">,
               Intrinsic<[llvm_i32_ty], [llvm_v1i128_ty], [IntrNoMem]>;
 
+  // P10 Vector Expand with Mask
+  def int_ppc_altivec_vexpandbm : GCCBuiltin<"__builtin_altivec_vexpandbm">,
+              Intrinsic<[llvm_v16i8_ty], [llvm_v16i8_ty], [IntrNoMem]>;
+  def int_ppc_altivec_vexpandhm : GCCBuiltin<"__builtin_altivec_vexpandhm">,
+              Intrinsic<[llvm_v8i16_ty], [llvm_v8i16_ty], [IntrNoMem]>;
+  def int_ppc_altivec_vexpandwm : GCCBuiltin<"__builtin_altivec_vexpandwm">,
+              Intrinsic<[llvm_v4i32_ty], [llvm_v4i32_ty], [IntrNoMem]>;
+  def int_ppc_altivec_vexpanddm : GCCBuiltin<"__builtin_altivec_vexpanddm">,
+              Intrinsic<[llvm_v2i64_ty], [llvm_v2i64_ty], [IntrNoMem]>;
+  def int_ppc_altivec_vexpandqm : GCCBuiltin<"__builtin_altivec_vexpandqm">,
+              Intrinsic<[llvm_v1i128_ty], [llvm_v1i128_ty], [IntrNoMem]>;
+
   // P10 Vector Parallel Bits Deposit/Extract Doubleword Builtins.
   def int_ppc_altivec_vpdepd : GCCBuiltin<"__builtin_altivec_vpdepd">,
               Intrinsic<[llvm_v2i64_ty], [llvm_v2i64_ty, llvm_v2i64_ty],
diff --git a/llvm/lib/Target/PowerPC/PPCInstrPrefix.td b/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
--- a/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
@@ -1003,19 +1003,24 @@
                                       (int_ppc_altivec_vextractqm v1i128:$vB))]>;
   def VEXPANDBM : VXForm_RD5_XO5_RS5<1602, 0, (outs vrrc:$vD), (ins vrrc:$vB),
                                      "vexpandbm $vD, $vB", IIC_VecGeneral,
-                                     []>;
+                                     [(set v16i8:$vD, (int_ppc_altivec_vexpandbm
+					   v16i8:$vB))]>;
   def VEXPANDHM : VXForm_RD5_XO5_RS5<1602, 1, (outs vrrc:$vD), (ins vrrc:$vB),
                                      "vexpandhm $vD, $vB", IIC_VecGeneral,
-                                     []>;
+                                     [(set v8i16:$vD, (int_ppc_altivec_vexpandhm
+                                           v8i16:$vB))]>;
   def VEXPANDWM : VXForm_RD5_XO5_RS5<1602, 2, (outs vrrc:$vD), (ins vrrc:$vB),
                                      "vexpandwm $vD, $vB", IIC_VecGeneral,
-                                     []>;
+                                     [(set v4i32:$vD, (int_ppc_altivec_vexpandwm
+                                           v4i32:$vB))]>;
   def VEXPANDDM : VXForm_RD5_XO5_RS5<1602, 3, (outs vrrc:$vD), (ins vrrc:$vB),
                                      "vexpanddm $vD, $vB", IIC_VecGeneral,
-                                     []>;
+                                     [(set v2i64:$vD, (int_ppc_altivec_vexpanddm
+                                           v2i64:$vB))]>;
   def VEXPANDQM : VXForm_RD5_XO5_RS5<1602, 4, (outs vrrc:$vD), (ins vrrc:$vB),
                                      "vexpandqm $vD, $vB", IIC_VecGeneral,
-                                     []>;
+                                     [(set v1i128:$vD, (int_ppc_altivec_vexpandqm
+                                           v1i128:$vB))]>;
   def MTVSRBM : VXForm_RD5_XO5_RS5<1602, 16, (outs vrrc:$vD), (ins g8rc:$rB),
                                    "mtvsrbm $vD, $rB", IIC_VecGeneral,
                                    []>;
diff --git a/llvm/test/CodeGen/PowerPC/p10-vector-mask-ops.ll b/llvm/test/CodeGen/PowerPC/p10-vector-mask-ops.ll
--- a/llvm/test/CodeGen/PowerPC/p10-vector-mask-ops.ll
+++ b/llvm/test/CodeGen/PowerPC/p10-vector-mask-ops.ll
@@ -64,3 +64,59 @@
   %ext = tail call i32 @llvm.ppc.altivec.vextractqm(<1 x i128> %a)
   ret i32 %ext
 }
+
+declare <16 x i8> @llvm.ppc.altivec.vexpandbm(<16 x i8>)
+declare <8 x i16> @llvm.ppc.altivec.vexpandhm(<8 x i16>)
+declare <4 x i32> @llvm.ppc.altivec.vexpandwm(<4 x i32>)
+declare <2 x i64> @llvm.ppc.altivec.vexpanddm(<2 x i64>)
+declare <1 x i128> @llvm.ppc.altivec.vexpandqm(<1 x i128>)
+
+define <16 x i8> @test_vexpandbm(<16 x i8> %a) {
+; CHECK-LABEL: test_vexpandbm:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vexpandbm v2, v2
+; CHECK-NEXT:    blr
+entry:
+  %exp = tail call <16 x i8> @llvm.ppc.altivec.vexpandbm(<16 x i8> %a)
+  ret <16 x i8> %exp
+}
+
+define <8 x i16> @test_vexpandhm(<8 x i16> %a) {
+; CHECK-LABEL: test_vexpandhm:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vexpandhm v2, v2
+; CHECK-NEXT:    blr
+entry:
+  %exp = tail call <8 x i16> @llvm.ppc.altivec.vexpandhm(<8 x i16> %a)
+  ret <8 x i16> %exp
+}
+
+define <4 x i32> @test_vexpandwm(<4 x i32> %a) {
+; CHECK-LABEL: test_vexpandwm:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vexpandwm v2, v2
+; CHECK-NEXT:    blr
+entry:
+  %exp = tail call <4 x i32> @llvm.ppc.altivec.vexpandwm(<4 x i32> %a)
+  ret <4 x i32> %exp
+}
+
+define <2 x i64> @test_vexpanddm(<2 x i64> %a) {
+; CHECK-LABEL: test_vexpanddm:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vexpanddm v2, v2
+; CHECK-NEXT:    blr
+entry:
+  %exp = tail call <2 x i64> @llvm.ppc.altivec.vexpanddm(<2 x i64> %a)
+  ret <2 x i64> %exp
+}
+
+define <1 x i128> @test_vexpandqm(<1 x i128> %a) {
+; CHECK-LABEL: test_vexpandqm:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vexpandqm v2, v2
+; CHECK-NEXT:    blr
+entry:
+  %exp = tail call <1 x i128> @llvm.ppc.altivec.vexpandqm(<1 x i128> %a)
+  ret <1 x i128> %exp
+}