s390x/tcg: Implement VECTOR SCATTER ELEMENT

Similar to VECTOR GATHER ELEMENT, but the other direction.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20190307121539.12842-25-david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

target/s390x/insn-data.def

@@ -1027,6 +1027,9 @@
     F(0xe74d, VREP,    VRI_c, V,   0, 0, 0, 0, vrep, 0, IF_VEC)
 /* VECTOR REPLICATE IMMEDIATE */
     F(0xe745, VREPI,   VRI_a, V,   0, 0, 0, 0, vrepi, 0, IF_VEC)
+/* VECTOR SCATTER ELEMENT */
+    E(0xe71b, VSCEF,   VRV,   V,   la2, 0, 0, 0, vsce, 0, ES_32, IF_VEC)
+    E(0xe71a, VSCEG,   VRV,   V,   la2, 0, 0, 0, vsce, 0, ES_64, IF_VEC)
 
 #ifndef CONFIG_USER_ONLY
 /* COMPARE AND SWAP AND PURGE */

target/s390x/translate_vx.inc.c

@@ -721,3 +721,25 @@ static DisasJumpType op_vrepi(DisasContext *s, DisasOps *o)
     gen_gvec_dupi(es, get_field(s->fields, v1), data);
     return DISAS_NEXT;
 }
+
+static DisasJumpType op_vsce(DisasContext *s, DisasOps *o)
+{
+    const uint8_t es = s->insn->data;
+    const uint8_t enr = get_field(s->fields, m3);
+    TCGv_i64 tmp;
+
+    if (!valid_vec_element(enr, es)) {
+        gen_program_exception(s, PGM_SPECIFICATION);
+        return DISAS_NORETURN;
+    }
+
+    tmp = tcg_temp_new_i64();
+    read_vec_element_i64(tmp, get_field(s->fields, v2), enr, es);
+    tcg_gen_add_i64(o->addr1, o->addr1, tmp);
+    gen_addi_and_wrap_i64(s, o->addr1, o->addr1, 0);
+
+    read_vec_element_i64(tmp, get_field(s->fields, v1), enr, es);
+    tcg_gen_qemu_st_i64(tmp, o->addr1, get_mem_index(s), MO_TE | es);
+    tcg_temp_free_i64(tmp);
+    return DISAS_NEXT;
+}