On 06/20/2018 05:05 AM, Yongbok Kim wrote:
> + case NM_SOV:
> + {
> + TCGv t0 = tcg_temp_local_new();
> + TCGv t1 = tcg_temp_new();
> + TCGv t2 = tcg_temp_new();
> + TCGLabel *l1 = gen_new_label();
> +
> + gen_load_gpr(t1, rs);
> + gen_load_gpr(t2, rt);
> + tcg_gen_add_tl(t0, t1, t2);
> + tcg_gen_ext32s_tl(t0, t0);
> + tcg_gen_xor_tl(t1, t1, t2);
> + tcg_gen_xor_tl(t2, t0, t2);
> + tcg_gen_andc_tl(t1, t2, t1);
> +
> + tcg_gen_movi_tl(t0, 0);
> + tcg_gen_brcondi_tl(TCG_COND_GE, t1, 0, l1);
> + /* operands of same sign, result different sign */
> +
> + tcg_gen_movi_tl(t0, 1);
> + gen_set_label(l1);
> + gen_store_gpr(t0, rd);
No need for branch. This is just extracting the sign bit, so
tcg_gen_shri_tl(t0, t1, TARGET_LONG_BITS - 1);
r~
