Index: lib/Target/PowerPC/PPCInstrAltivec.td
===================================================================
--- lib/Target/PowerPC/PPCInstrAltivec.td
+++ lib/Target/PowerPC/PPCInstrAltivec.td
@@ -1310,8 +1310,13 @@
 }
 
 // Vector Integer Negate
-def VNEGW : VX_VT5_EO5_VB5<1538, 6, "vnegw", []>;
-def VNEGD : VX_VT5_EO5_VB5<1538, 7, "vnegd", []>;
+def VNEGW : VX_VT5_EO5_VB5<1538, 6, "vnegw",
+                           [(set v4i32:$vD,
+                            (sub (v4i32 immAllZerosV), v4i32:$vB))]>;
+
+def VNEGD : VX_VT5_EO5_VB5<1538, 7, "vnegd",
+                           [(set v2i64:$vD,
+                            (sub (v2i64 (bitconvert (v4i32 immAllZerosV))), v2i64:$vB))]>;
 
 // Vector Parity Byte
 def VPRTYBW : VX_VT5_EO5_VB5<1538,  8, "vprtybw", []>;
Index: test/CodeGen/PowerPC/vsx-p9.ll
===================================================================
--- test/CodeGen/PowerPC/vsx-p9.ll
+++ test/CodeGen/PowerPC/vsx-p9.ll
@@ -143,4 +143,26 @@
   ret void
 }
 
+define <4 x i32> @test0(<4 x i32> %a) local_unnamed_addr #0 {
+entry:
+  %sub.i = sub <4 x i32> zeroinitializer, %a
+  ret <4 x i32> %sub.i
+
+; CHECK-LABEL: @test0
+; CHECK: vnegw 2, 2
+; CHECK: blr
+
+}
+
+define <2 x i64> @test1(<2 x i64> %a) local_unnamed_addr #0 {
+entry:
+  %sub.i = sub <2 x i64> zeroinitializer, %a
+  ret <2 x i64> %sub.i
+
+; CHECK-LABEL: @test1
+; CHECK: vnegd 2, 2
+; CHECK: blr
+
+}
+
 declare void @sink(...)