s390x/tcg: Implement VECTOR SUBTRACT WITH BORROW INDICATION
authorDavid Hildenbrand <david@redhat.com>
Wed, 10 Apr 2019 20:15:07 +0000 (22:15 +0200)
committerDavid Hildenbrand <david@redhat.com>
Fri, 17 May 2019 08:54:13 +0000 (10:54 +0200)
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>
target/s390x/insn-data.def
target/s390x/translate_vx.inc.c

index 94de3c9c7d30106636080a6c28e7c1d05e1f61df..a60d8531dc52f6b710fb9e8f70e86f3fad78ff5f 100644 (file)
     F(0xe7f7, VS,      VRR_c, V,   0, 0, 0, 0, vs, 0, IF_VEC)
 /* VECTOR SUBTRACT COMPUTE BORROW INDICATION */
     F(0xe7f5, VSCBI,   VRR_c, V,   0, 0, 0, 0, vscbi, 0, IF_VEC)
+/* VECTOR SUBTRACT WITH BORROW INDICATION */
+    F(0xe7bf, VSBI,    VRR_d, V,   0, 0, 0, 0, vsbi, 0, IF_VEC)
 
 #ifndef CONFIG_USER_ONLY
 /* COMPARE AND SWAP AND PURGE */
index b7052f73f8a553cc50e377eba4aab15df7a72fc7..66a938a90972ae0c9828c1536fe68d18ed284bdb 100644 (file)
@@ -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;
+}