Index: include/clang/Basic/BuiltinsPPC.def
===================================================================
--- include/clang/Basic/BuiltinsPPC.def
+++ include/clang/Basic/BuiltinsPPC.def
@@ -278,6 +278,11 @@
 BUILTIN(__builtin_altivec_vpopcntw, "V4UiV4Ui", "")
 BUILTIN(__builtin_altivec_vpopcntd, "V2ULLiV2ULLi", "")
 
+// Absolute difference built-ins
+BUILTIN(__builtin_altivec_vabsdub, "V16UcV16UcV16Uc", "")
+BUILTIN(__builtin_altivec_vabsduh, "V8UsV8UsV8Us", "")
+BUILTIN(__builtin_altivec_vabsduw, "V4UiV4UiV4Ui", "")
+
 // VSX built-ins.
 
 BUILTIN(__builtin_vsx_lxvd2x, "V2divC*", "")
Index: lib/Headers/altivec.h
===================================================================
--- lib/Headers/altivec.h
+++ lib/Headers/altivec.h
@@ -163,6 +163,26 @@
       __a, __builtin_altivec_vsubsws((vector signed int)(0), __a));
 }
 
+/* vec_absd */
+#if defined(__POWER9_VECTOR__)
+
+static __inline__ vector unsigned char __ATTRS_o_ai
+vec_absd(vector unsigned char __a, vector unsigned char __b) {
+  return __builtin_altivec_vabsdub(__a, __b);
+}
+
+static __inline__ vector unsigned short __ATTRS_o_ai
+vec_absd(vector unsigned short __a, vector unsigned short __b) {
+  return __builtin_altivec_vabsduh(__a, __b);
+}
+
+static __inline__ vector unsigned int __ATTRS_o_ai
+vec_absd(vector unsigned int __a,  vector unsigned int __b) {
+  return __builtin_altivec_vabsduw(__a, __b);
+}
+
+#endif /* End __POWER9_VECTOR__ */
+
 /* vec_add */
 
 static __inline__ vector signed char __ATTRS_o_ai
Index: test/CodeGen/builtins-ppc-p9vector.c
===================================================================
--- test/CodeGen/builtins-ppc-p9vector.c
+++ test/CodeGen/builtins-ppc-p9vector.c
@@ -726,3 +726,18 @@
 // CHECK-NEXT: ret <4 x float>
   return vec_insert_exp (vuia,vuib);
 }
+vector unsigned char test59(void) {
+// CHECK-BE: call <16 x i8> @llvm.ppc.altivec.vabsdub(<16 x i8> {{.+}}, <16 x i8> {{.+}})
+// CHECK: call <16 x i8> @llvm.ppc.altivec.vabsdub(<16 x i8> {{.+}}, <16 x i8> {{.+}})
+  return vec_absd(vuca, vucb);
+}
+vector unsigned short test60(void) {
+// CHECK-BE: call <8 x i16> @llvm.ppc.altivec.vabsduh(<8 x i16> {{.+}}, <8 x i16> {{.+}})
+// CHECK: call <8 x i16> @llvm.ppc.altivec.vabsduh(<8 x i16> {{.+}}, <8 x i16> {{.+}})
+  return vec_absd(vusa, vusb);
+}
+vector unsigned int test61(void) {
+// CHECK-BE: call <4 x i32> @llvm.ppc.altivec.vabsduw(<4 x i32> {{.+}}, <4 x i32> {{.+}})
+// CHECK: call <4 x i32> @llvm.ppc.altivec.vabsduw(<4 x i32> {{.+}}, <4 x i32> {{.+}})
+  return vec_absd(vuia, vuib);
+}