Re: [RFC PATCH 21/43] target/loongarch: Implement vmskltz/vmskgez/vmsknz

[Richard Henderson <richard.henderson@linaro.org>]

On 12/24/22 00:16, Song Gao wrote:
> +static void do_vmskltz(vec_t *Vd, vec_t *Vj, int bit, int n)
> +{
> +    switch (bit) {
> +    case 8:
> +        Vd->H[0] |= ((0x80 & Vj->B[n]) == 0) << n;
> +        break;
> +    case 16:
> +        Vd->H[0] |= ((0x8000 & Vj->H[n]) == 0) << n;
> +        break;
> +    case 32:
> +        Vd->H[0] |= ((0x80000000 & Vj->W[n]) == 0) << n;
> +        break;
> +    case 64:
> +        Vd->H[0] |= ((0x8000000000000000 & Vj->D[n]) == 0) << n;
> +        break;
> +    default:
> +        g_assert_not_reached();
> +    }
> +}
> +
> +static void do_vmskgez(vec_t *Vd, vec_t *Vj, int bit, int n)
> +{
> +    Vd->H[0] |= !((0x80 & Vj->B[n]) == 0) << n;
> +}
> +
> +static void do_vmsknz(vec_t *Vd, vec_t *Vj, int bit, int n)
> +{
> +    Vd->H[0] |=  (Vj->B[n] == 0) << n;
> +}
The bit collection and compaction can be done with a set of integer shifts.
E.g. helper_cmpbe0 in target/alpha/int_helper.c.


r~