diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 04c64217b7fc0b31a2a85e2706bd4bd5c08ce78d..5fcc54607813aa4670cc61247e2a451eb3939354 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -272,6 +272,8 @@ DEF_HELPER_2(vextsh2w, void, avr, avr)
 DEF_HELPER_2(vextsb2d, void, avr, avr)
 DEF_HELPER_2(vextsh2d, void, avr, avr)
 DEF_HELPER_2(vextsw2d, void, avr, avr)
+DEF_HELPER_2(vnegw, void, avr, avr)
+DEF_HELPER_2(vnegd, void, avr, avr)
 DEF_HELPER_2(vupkhpx, void, avr, avr)
 DEF_HELPER_2(vupklpx, void, avr, avr)
 DEF_HELPER_2(vupkhsb, void, avr, avr)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index 5aee0a81c7086ffed3455411cbf498f3d5611890..dca479838df4b399a6775284809bad0df8d457a3 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -1949,6 +1949,18 @@ VEXT_SIGNED(vextsh2d, s64, UINT16_MAX, int16_t, int64_t)
 VEXT_SIGNED(vextsw2d, s64, UINT32_MAX, int32_t, int64_t)
 #undef VEXT_SIGNED
 
+#define VNEG(name, element)                                         \
+void helper_##name(ppc_avr_t *r, ppc_avr_t *b)                      \
+{                                                                   \
+    int i;                                                          \
+    VECTOR_FOR_INORDER_I(i, element) {                              \
+        r->element[i] = -b->element[i];                             \
+    }                                                               \
+}
+VNEG(vnegw, s32)
+VNEG(vnegd, s64)
+#undef VNEG
+
 #define VSPLTI(suffix, element, splat_type)                     \
     void helper_vspltis##suffix(ppc_avr_t *r, uint32_t splat)   \
     {                                                           \
diff --git a/target-ppc/translate/vmx-impl.inc.c b/target-ppc/translate/vmx-impl.inc.c
index c8998f3eab3813ad81242d01476a9ccba7f30529..563f1016420fa01dc5e92ea60ed0f9f4847b0a47 100644
--- a/target-ppc/translate/vmx-impl.inc.c
+++ b/target-ppc/translate/vmx-impl.inc.c
@@ -815,6 +815,8 @@ GEN_VXFORM_NOA(vclzb, 1, 28)
 GEN_VXFORM_NOA(vclzh, 1, 29)
 GEN_VXFORM_NOA(vclzw, 1, 30)
 GEN_VXFORM_NOA(vclzd, 1, 31)
+GEN_VXFORM_NOA_2(vnegw, 1, 24, 6)
+GEN_VXFORM_NOA_2(vnegd, 1, 24, 7)
 GEN_VXFORM_NOA_2(vextsb2w, 1, 24, 16)
 GEN_VXFORM_NOA_2(vextsh2w, 1, 24, 17)
 GEN_VXFORM_NOA_2(vextsb2d, 1, 24, 24)
diff --git a/target-ppc/translate/vmx-ops.inc.c b/target-ppc/translate/vmx-ops.inc.c
index 68cba3e4745ab4d6d4d4d6b2fbeb90e1378b331e..ab64ab2e0192d1202a007c7aa2f6eb762f0b2e16 100644
--- a/target-ppc/translate/vmx-ops.inc.c
+++ b/target-ppc/translate/vmx-ops.inc.c
@@ -215,6 +215,8 @@ GEN_VXFORM_DUAL_INV(vspltish, vinserth, 6, 13, 0x00000000, 0x100000,
 GEN_VXFORM_DUAL_INV(vspltisw, vinsertw, 6, 14, 0x00000000, 0x100000,
                                                PPC_ALTIVEC),
 GEN_VXFORM_300_EXT(vinsertd, 6, 15, 0x100000),
+GEN_VXFORM_300_EO(vnegw, 0x01, 0x18, 0x06),
+GEN_VXFORM_300_EO(vnegd, 0x01, 0x18, 0x07),
 GEN_VXFORM_300_EO(vextsb2w, 0x01, 0x18, 0x10),
 GEN_VXFORM_300_EO(vextsh2w, 0x01, 0x18, 0x11),
 GEN_VXFORM_300_EO(vextsb2d, 0x01, 0x18, 0x18),