Re: [Qemu-devel] [PATCH 2/2] target/arm: Only implement doubles if the FPU supports them

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

On 6/14/19 3:44 AM, Peter Maydell wrote:
> @@ -173,6 +173,11 @@ static bool trans_VSEL(DisasContext *s, arg_VSEL *a)
>          ((a->vm | a->vn | a->vd) & 0x10)) {
>          return false;
>      }
> +
> +    if (dp && !dc_isar_feature(aa32_fpdp, s)) {
> +        return false;
> +    }

Would it be cleaner to define something like

static bool vfp_dp_enabled(DisasContext *s, int regmask)
{
    if (!dc_isar_feature(aa32_fpdp, s)) {
        /* All double-precision disabled.  */
        return false;
    }
    if (!dc_isar_feature(aa32_fp_d32, s) && (regmask & 0x10)) {
        /* D16-D31 do not exist.  */
        return false;
    }
    return true;
}

Then use

    if (dp && !vfp_dp_enabled(s, a->vm | a->vn | a->vd))

?


r~