Re: [PATCH 09/10] target/arm: Convert Neon VTBL, VTBX to decodetree

[Richard Henderson]

On 6/11/20 7:45 AM, Peter Maydell wrote:
> +static bool trans_VTBL(DisasContext *s, arg_VTBL *a)
> +{
> +    int n;
> +    TCGv_i32 tmp, tmp2, tmp3, tmp4;
> +    TCGv_ptr ptr1;
> +
> +    if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
> +        return false;
> +    }
> +
> +    /* UNDEF accesses to D16-D31 if they don't exist. */
> +    if (!dc_isar_feature(aa32_simd_r32, s) &&
> +        ((a->vd | a->vn | a->vm) & 0x10)) {
> +        return false;
> +    }
> +
> +    if (!vfp_access_check(s)) {
> +        return true;
> +    }
> +
> +    n = a->len + 1;
> +    if ((a->vn + n) > 32) {
> +        /*
> +         * This is UNPREDICTABLE; we choose to UNDEF to avoid the
> +         * helper function running off the end of the register file.
> +         */
> +        return 1;
> +    }

Oops, meant to point out: return false.


r~