On 4/11/19 12:08 AM, David Hildenbrand wrote:
> +static DisasJumpType op_vsbcbi(DisasContext *s, DisasOps *o)
> +{
> + if (get_field(s->fields, m5) != ES_128) {
> + gen_program_exception(s, PGM_SPECIFICATION);
> + return DISAS_NORETURN;
> + }
> +
> + gen_gvec_4_ool(get_field(s->fields, v1), get_field(s->fields, v2),
> + get_field(s->fields, v3), get_field(s->fields, v4), 0,
> + gen_helper_gvec_vsbcbi128);
> + return DISAS_NEXT;
> +}
Reviewed-by: Richard Henderson <[email protected]>
I'm sure this can be done similarly to add with carry compute carry, but it's
harder to reason with sub2. Something like
tcg_gen_andi_i64(tl, cl, 1);
tcg_gen_sub2_i64(tl, th, al, zero, tl, zero);
tcg_gen_sub2_i64(tl, th, tl, th, bl, zero);
tcg_gen_andi_i64(tl, th, 1);
tcg_gen_sub2_i64(tl, th, ah, zero, tl, zero);
tcg_gen_sub2_i64(tl, th, tl, th, bh, zero);
tcg_gen_andi_i64(tl, th, 1);
/* result in tl */
r~
