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s390x/tcg: Implement VECTOR ADD COMPUTE CARRY

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128-bit handling courtesy of Richard H.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2019-04-10 23:15:30 +02:00
parent b1e67c8f23
commit c563f28ade
2 changed files with 100 additions and 0 deletions
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2
target/s390x/insn-data.def
View File

@ -1058,6 +1058,8 @@
/* VECTOR ADD */
F(0xe7f3, VA, VRR_c, V, 0, 0, 0, 0, va, 0, IF_VEC)
/* VECTOR ADD COMPUTE CARRY */
F(0xe7f1, VACC, VRR_c, V, 0, 0, 0, 0, vacc, 0, IF_VEC)
#ifndef CONFIG_USER_ONLY
/* COMPARE AND SWAP AND PURGE */

98
target/s390x/translate_vx.inc.c
View File

@ -136,6 +136,9 @@ static void get_vec_element_ptr_i64(TCGv_ptr ptr, uint8_t reg, TCGv_i64 enr,
tcg_temp_free_i64(tmp);
}
#define gen_gvec_3(v1, v2, v3, gen) \
tcg_gen_gvec_3(vec_full_reg_offset(v1), vec_full_reg_offset(v2), \
vec_full_reg_offset(v3), 16, 16, gen)
#define gen_gvec_3_ool(v1, v2, v3, data, fn) \
tcg_gen_gvec_3_ool(vec_full_reg_offset(v1), vec_full_reg_offset(v2), \
vec_full_reg_offset(v3), 16, 16, data, fn)
@ -985,3 +988,98 @@ static DisasJumpType op_va(DisasContext *s, DisasOps *o)
get_field(s->fields, v3));
return DISAS_NEXT;
}
static void gen_acc(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b, uint8_t es)
{
const uint8_t msb_bit_nr = NUM_VEC_ELEMENT_BITS(es) - 1;
TCGv_i64 msb_mask = tcg_const_i64(dup_const(es, 1ull << msb_bit_nr));
TCGv_i64 t1 = tcg_temp_new_i64();
TCGv_i64 t2 = tcg_temp_new_i64();
TCGv_i64 t3 = tcg_temp_new_i64();
/* Calculate the carry into the MSB, ignoring the old MSBs */
tcg_gen_andc_i64(t1, a, msb_mask);
tcg_gen_andc_i64(t2, b, msb_mask);
tcg_gen_add_i64(t1, t1, t2);
/* Calculate the MSB without any carry into it */
tcg_gen_xor_i64(t3, a, b);
/* Calculate the carry out of the MSB in the MSB bit position */
tcg_gen_and_i64(d, a, b);
tcg_gen_and_i64(t1, t1, t3);
tcg_gen_or_i64(d, d, t1);
/* Isolate and shift the carry into position */
tcg_gen_and_i64(d, d, msb_mask);
tcg_gen_shri_i64(d, d, msb_bit_nr);
tcg_temp_free_i64(t1);
tcg_temp_free_i64(t2);
tcg_temp_free_i64(t3);
}
static void gen_acc8_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)
{
gen_acc(d, a, b, ES_8);
}
static void gen_acc16_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)
{
gen_acc(d, a, b, ES_16);
}
static void gen_acc_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b)
{
TCGv_i32 t = tcg_temp_new_i32();
tcg_gen_add_i32(t, a, b);
tcg_gen_setcond_i32(TCG_COND_LTU, d, t, b);
tcg_temp_free_i32(t);
}
static void gen_acc_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)
{
TCGv_i64 t = tcg_temp_new_i64();
tcg_gen_add_i64(t, a, b);
tcg_gen_setcond_i64(TCG_COND_LTU, d, t, b);
tcg_temp_free_i64(t);
}
static void gen_acc2_i64(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 al,
TCGv_i64 ah, TCGv_i64 bl, TCGv_i64 bh)
{
TCGv_i64 th = tcg_temp_new_i64();
TCGv_i64 tl = tcg_temp_new_i64();
TCGv_i64 zero = tcg_const_i64(0);
tcg_gen_add2_i64(tl, th, al, zero, bl, zero);
tcg_gen_add2_i64(tl, th, th, zero, ah, zero);
tcg_gen_add2_i64(tl, dl, tl, th, bh, zero);
tcg_gen_mov_i64(dh, zero);
tcg_temp_free_i64(th);
tcg_temp_free_i64(tl);
tcg_temp_free_i64(zero);
}
static DisasJumpType op_vacc(DisasContext *s, DisasOps *o)
{
const uint8_t es = get_field(s->fields, m4);
static const GVecGen3 g[4] = {
{ .fni8 = gen_acc8_i64, },
{ .fni8 = gen_acc16_i64, },
{ .fni4 = gen_acc_i32, },
{ .fni8 = gen_acc_i64, },
};
if (es > ES_128) {
gen_program_exception(s, PGM_SPECIFICATION);
return DISAS_NORETURN;
} else if (es == ES_128) {
gen_gvec128_3_i64(gen_acc2_i64, get_field(s->fields, v1),
get_field(s->fields, v2), get_field(s->fields, v3));
return DISAS_NEXT;
}
gen_gvec_3(get_field(s->fields, v1), get_field(s->fields, v2),
get_field(s->fields, v3), &g[es]);
return DISAS_NEXT;
}