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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>
master
David Hildenbrand 2019-04-10 22:15:07 +02:00
parent 1ee2d7ba72
commit 48390a7c27
2 changed files with 28 additions and 0 deletions
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2
target/s390x/insn-data.def
View File

@ -1178,6 +1178,8 @@
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 */

26
target/s390x/translate_vx.inc.c
View 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;
}