[Qemu-devel] [PATCH v1 23/33] s390x/tcg: Implement VECTOR PERMUTE DOUBLEWORD IMMEDIATE

[David Hildenbrand <david@redhat.com>]

Read the whole input before modifying the destination vector.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/insn-data.def      |  2 ++
 target/s390x/translate_vx.inc.c | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index b4b4be651b..eb4dea2e2d 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -1022,6 +1022,8 @@
     F(0xe795, VPKLS,   VRR_b, V,   0, 0, 0, 0, vpks, 0, IF_VEC)
 /* VECTOR PERMUTE */
     F(0xe78c, VPERM,   VRR_e, V,   0, 0, 0, 0, vperm, 0, IF_VEC)
+/* VECTOR PERMUTE DOUBLEWORD IMMEDIATE */
+    F(0xe784, VPDI,    VRR_c, V,   0, 0, 0, 0, vpdi, 0, IF_VEC)
 
 #ifndef CONFIG_USER_ONLY
 /* COMPARE AND SWAP AND PURGE */
diff --git a/target/s390x/translate_vx.inc.c b/target/s390x/translate_vx.inc.c
index a57d4816c4..e67b47f262 100644
--- a/target/s390x/translate_vx.inc.c
+++ b/target/s390x/translate_vx.inc.c
@@ -614,3 +614,19 @@ static DisasJumpType op_vperm(DisasContext *s, DisasOps *o)
                    0, gen_helper_gvec_vperm);
     return DISAS_NEXT;
 }
+
+static DisasJumpType op_vpdi(DisasContext *s, DisasOps *o)
+{
+    const uint8_t i2 = extract32(get_field(s->fields, m4), 2, 1);
+    const uint8_t i3 = extract32(get_field(s->fields, m4), 0, 1);
+    TCGv_i64 t0 = tcg_temp_new_i64();
+    TCGv_i64 t1 = tcg_temp_new_i64();
+
+    read_vec_element_i64(t0, get_field(s->fields, v2), i2, MO_64);
+    read_vec_element_i64(t1, get_field(s->fields, v3), i3, MO_64);
+    write_vec_element_i64(t0, get_field(s->fields, v1), 0, MO_64);
+    write_vec_element_i64(t1, get_field(s->fields, v1), 1, MO_64);
+    tcg_temp_free_i64(t0);
+    tcg_temp_free_i64(t1);
+    return DISAS_NEXT;
+}
-- 
2.17.2