target-ppc: implement vnegw/d instructions

Vector Integer Negate Instructions:

vnegw: Vector Negate Word
vnegd: Vector Negate Doubleword
Signed-off-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

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)

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)   \
     {                                                           \

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)

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),