diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 2621e433cd..76aec5a21f 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -1164,6 +1164,8 @@
     F(0xe774, VSL,     VRR_c, V,   0, 0, 0, 0, vsl, 0, IF_VEC)
 /* VECTOR SHIFT LEFT BY BYTE */
     F(0xe775, VSLB,    VRR_c, V,   0, 0, 0, 0, vsl, 0, IF_VEC)
+/* VECTOR SHIFT LEFT DOUBLE BY BYTE */
+    F(0xe777, VSLDB,   VRI_d, V,   0, 0, 0, 0, vsldb, 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 734c022b36..43f67e3f82 100644
--- a/target/s390x/translate_vx.inc.c
+++ b/target/s390x/translate_vx.inc.c
@@ -2060,3 +2060,32 @@ static DisasJumpType op_vsl(DisasContext *s, DisasOps *o)
     tcg_temp_free_i64(shift);
     return DISAS_NEXT;
 }
+
+static DisasJumpType op_vsldb(DisasContext *s, DisasOps *o)
+{
+    const uint8_t i4 = get_field(s->fields, i4) & 0xf;
+    const int left_shift = (i4 & 7) * 8;
+    const int right_shift = 64 - left_shift;
+    TCGv_i64 t0 = tcg_temp_new_i64();
+    TCGv_i64 t1 = tcg_temp_new_i64();
+    TCGv_i64 t2 = tcg_temp_new_i64();
+
+    if ((i4 & 8) == 0) {
+        read_vec_element_i64(t0, get_field(s->fields, v2), 0, ES_64);
+        read_vec_element_i64(t1, get_field(s->fields, v2), 1, ES_64);
+        read_vec_element_i64(t2, get_field(s->fields, v3), 0, ES_64);
+    } else {
+        read_vec_element_i64(t0, get_field(s->fields, v2), 1, ES_64);
+        read_vec_element_i64(t1, get_field(s->fields, v3), 0, ES_64);
+        read_vec_element_i64(t2, get_field(s->fields, v3), 1, ES_64);
+    }
+    tcg_gen_extract2_i64(t0, t1, t0, right_shift);
+    tcg_gen_extract2_i64(t1, t2, t1, right_shift);
+    write_vec_element_i64(t0, get_field(s->fields, v1), 0, ES_64);
+    write_vec_element_i64(t1, get_field(s->fields, v1), 1, ES_64);
+
+    tcg_temp_free(t0);
+    tcg_temp_free(t1);
+    tcg_temp_free(t2);
+    return DISAS_NEXT;
+}