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tcg: Add support for vector compare select

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Perform a per-element conditional move.  This combination operation is
easier to implement on some host vector units than plain cmp+bitsel.
Omit the usual gvec interface, as this is intended to be used by
target-specific gvec expansion call-backs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-04-30 13:01:12 -07:00
parent 38dc12947e
commit f75da2988e
8 changed files with 75 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

59
tcg/tcg-op-vec.c
View file

@ -119,6 +119,11 @@ bool tcg_can_emit_vecop_list(const TCGOpcode *list,
continue;
}
break;
case INDEX_op_cmpsel_vec:
if (tcg_can_emit_vec_op(INDEX_op_cmp_vec, type, vece)) {
continue;
}
break;
default:
break;
}
@ -159,6 +164,20 @@ void vec_gen_4(TCGOpcode opc, TCGType type, unsigned vece,
op->args[3] = c;
}
static void vec_gen_6(TCGOpcode opc, TCGType type, unsigned vece, TCGArg r,
TCGArg a, TCGArg b, TCGArg c, TCGArg d, TCGArg e)
{
TCGOp *op = tcg_emit_op(opc);
TCGOP_VECL(op) = type - TCG_TYPE_V64;
TCGOP_VECE(op) = vece;
op->args[0] = r;
op->args[1] = a;
op->args[2] = b;
op->args[3] = c;
op->args[4] = d;
op->args[5] = e;
}
static void vec_gen_op2(TCGOpcode opc, unsigned vece, TCGv_vec r, TCGv_vec a)
{
TCGTemp *rt = tcgv_vec_temp(r);
@ -717,3 +736,43 @@ void tcg_gen_bitsel_vec(unsigned vece, TCGv_vec r, TCGv_vec a,
tcg_temp_free_vec(t);
}
}
void tcg_gen_cmpsel_vec(TCGCond cond, unsigned vece, TCGv_vec r,
TCGv_vec a, TCGv_vec b, TCGv_vec c, TCGv_vec d)
{
TCGTemp *rt = tcgv_vec_temp(r);
TCGTemp *at = tcgv_vec_temp(a);
TCGTemp *bt = tcgv_vec_temp(b);
TCGTemp *ct = tcgv_vec_temp(c);
TCGTemp *dt = tcgv_vec_temp(d);
TCGArg ri = temp_arg(rt);
TCGArg ai = temp_arg(at);
TCGArg bi = temp_arg(bt);
TCGArg ci = temp_arg(ct);
TCGArg di = temp_arg(dt);
TCGType type = rt->base_type;
const TCGOpcode *hold_list;
int can;
tcg_debug_assert(at->base_type >= type);
tcg_debug_assert(bt->base_type >= type);
tcg_debug_assert(ct->base_type >= type);
tcg_debug_assert(dt->base_type >= type);
tcg_assert_listed_vecop(INDEX_op_cmpsel_vec);
hold_list = tcg_swap_vecop_list(NULL);
can = tcg_can_emit_vec_op(INDEX_op_cmpsel_vec, type, vece);
if (can > 0) {
vec_gen_6(INDEX_op_cmpsel_vec, type, vece, ri, ai, bi, ci, di, cond);
} else if (can < 0) {
tcg_expand_vec_op(INDEX_op_cmpsel_vec, type, vece,
ri, ai, bi, ci, di, cond);
} else {
TCGv_vec t = tcg_temp_new_vec(type);
tcg_gen_cmp_vec(cond, vece, t, a, b);
tcg_gen_bitsel_vec(vece, r, t, c, d);
tcg_temp_free_vec(t);
}
tcg_swap_vecop_list(hold_list);
}