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s390x/tcg: Implement VECTOR MERGE (HIGH|LOW) 

We cannot use gvec expansion as source and destination elements are
have different element numbers. So we'll expand using a fancy loop.
Also, we have to take care of overlapping source and destination
registers, therefore use a safe evaluation irder depending on the
operation.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190307121539.12842-19-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-03-07 13:15:25 +01:00 committed by Cornelia Huck
parent f6c7ff6757
commit 2ff47e6cce
2 changed files with 46 additions and 0 deletions
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4
target/s390x/insn-data.def
View File

@ -1010,6 +1010,10 @@
F(0xe762, VLVGP, VRR_f, V, r2, r3, 0, 0, vlvgp, 0, IF_VEC)
/* VECTOR LOAD WITH LENGTH */
F(0xe737, VLL, VRS_b, V, la2, r3_32u, 0, 0, vll, 0, IF_VEC)
/* VECTOR MERGE HIGH */
F(0xe761, VMRH, VRR_c, V, 0, 0, 0, 0, vmr, 0, IF_VEC)
/* VECTOR MERGE LOW */
F(0xe760, VMRL, VRR_c, V, 0, 0, 0, 0, vmr, 0, IF_VEC)
#ifndef CONFIG_USER_ONLY
/* COMPARE AND SWAP AND PURGE */

42
target/s390x/translate_vx.inc.c
View File

@ -532,3 +532,45 @@ static DisasJumpType op_vll(DisasContext *s, DisasOps *o)
tcg_temp_free_ptr(a0);
return DISAS_NEXT;
}
static DisasJumpType op_vmr(DisasContext *s, DisasOps *o)
{
const uint8_t v1 = get_field(s->fields, v1);
const uint8_t v2 = get_field(s->fields, v2);
const uint8_t v3 = get_field(s->fields, v3);
const uint8_t es = get_field(s->fields, m4);
int dst_idx, src_idx;
TCGv_i64 tmp;
if (es > ES_64) {
gen_program_exception(s, PGM_SPECIFICATION);
return DISAS_NORETURN;
}
tmp = tcg_temp_new_i64();
if (s->fields->op2 == 0x61) {
/* iterate backwards to avoid overwriting data we might need later */
for (dst_idx = NUM_VEC_ELEMENTS(es) - 1; dst_idx >= 0; dst_idx--) {
src_idx = dst_idx / 2;
if (dst_idx % 2 == 0) {
read_vec_element_i64(tmp, v2, src_idx, es);
} else {
read_vec_element_i64(tmp, v3, src_idx, es);
}
write_vec_element_i64(tmp, v1, dst_idx, es);
}
} else {
/* iterate forward to avoid overwriting data we might need later */
for (dst_idx = 0; dst_idx < NUM_VEC_ELEMENTS(es); dst_idx++) {
src_idx = (dst_idx + NUM_VEC_ELEMENTS(es)) / 2;
if (dst_idx % 2 == 0) {
read_vec_element_i64(tmp, v2, src_idx, es);
} else {
read_vec_element_i64(tmp, v3, src_idx, es);
}
write_vec_element_i64(tmp, v1, dst_idx, es);
}
}
tcg_temp_free_i64(tmp);
return DISAS_NEXT;
}