Re: [PATCH v3 10/37] target/ppc: Move Vector Compare Not Equal or Zero to decodetree

[Richard Henderson]

On 2/10/22 23:34, matheus.ferst@eldorado.org.br wrote:
> +static void gen_vcmpnez_vec(unsigned vece, TCGv_vec t, TCGv_vec a, TCGv_vec b)
> +{
> +    TCGv_vec t0, t1, zero;
> +
> +    t0 = tcg_temp_new_vec_matching(t);
> +    t1 = tcg_temp_new_vec_matching(t);
> +    zero = tcg_constant_vec_matching(t, vece, 0);
> +
> +    tcg_gen_cmp_vec(TCG_COND_EQ, vece, t0, a, zero);
> +    tcg_gen_cmp_vec(TCG_COND_EQ, vece, t1, b, zero);
> +    tcg_gen_cmp_vec(TCG_COND_NE, vece, t, a, b);
> +
> +    tcg_gen_or_vec(vece, t, t, t0);
> +    tcg_gen_or_vec(vece, t, t, t1);
> +
> +    tcg_gen_shli_vec(vece, t, t, (8 << vece) - 1);
> +    tcg_gen_sari_vec(vece, t, t, (8 << vece) - 1);

No shifting required, only the cmp.

> +static bool do_vcmpnez(DisasContext *ctx, arg_VC *a, int vece)
> +{
> +    static const TCGOpcode vecop_list[] = {
> +        INDEX_op_cmp_vec, INDEX_op_shli_vec, INDEX_op_sari_vec, 0
> +    };

Therefore no vecop_list required (cmp itself is mandatory).

r~