Re: [PATCH v4 36/47] target/ppc: Implement xvtlsbb instruction

[Richard Henderson]

On 2/22/22 04:36, matheus.ferst@eldorado.org.br wrote:
> +        tcg_gen_and_i64(tmp, mask, xb);
> +        tcg_gen_movcond_i64(TCG_COND_EQ, all_true, tmp,
> +                            mask, all_true, zero);
> +
> +        tcg_gen_andc_i64(tmp, mask, xb);
> +        tcg_gen_movcond_i64(TCG_COND_EQ, all_false, tmp,
> +                            mask, all_false, zero);

I would unroll this and use fewer conditions.

    t0 = mask & xb[0]
    t1 = mask & xb[1]

    o2 = t0 | t1
    a2 = t0 & t1

    o2 = (o2 == 0) << 1
    a2 = (a2 == mask) << 3
    crf = o2 | a2


r~