s390x/tcg: Implement VECTOR SUBTRACT WITH BORROW INDICATION

Fairly easy as only 128-bit handling is required. Simply perform the
subtraction and then subtract the borrow.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/target/s390x/translate_vx.inc.c b/target/s390x/translate_vx.inc.c
index b7052f73f8..66a938a909 100644
--- a/target/s390x/translate_vx.inc.c
+++ b/target/s390x/translate_vx.inc.c
@@ -2192,3 +2192,29 @@ static DisasJumpType op_vscbi(DisasContext *s, DisasOps *o)
                get_field(s->fields, v3), &g[es]);
     return DISAS_NEXT;
 }
+
+static void gen_sbi2_i64(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 al, TCGv_i64 ah,
+                         TCGv_i64 bl, TCGv_i64 bh, TCGv_i64 cl, TCGv_i64 ch)
+{
+    TCGv_i64 tl = tcg_temp_new_i64();
+    TCGv_i64 zero = tcg_const_i64(0);
+
+    tcg_gen_andi_i64(tl, cl, 1);
+    tcg_gen_sub2_i64(dl, dh, al, ah, bl, bh);
+    tcg_gen_sub2_i64(dl, dh, dl, dh, tl, zero);
+    tcg_temp_free_i64(tl);
+    tcg_temp_free_i64(zero);
+}
+
+static DisasJumpType op_vsbi(DisasContext *s, DisasOps *o)
+{
+    if (get_field(s->fields, m5) != ES_128) {
+        gen_program_exception(s, PGM_SPECIFICATION);
+        return DISAS_NORETURN;
+    }
+
+    gen_gvec128_4_i64(gen_sbi2_i64, get_field(s->fields, v1),
+                      get_field(s->fields, v2), get_field(s->fields, v3),
+                      get_field(s->fields, v4));
+    return DISAS_NEXT;
+}