Re: [RFC PATCH 06/11] target/arm: Introduce host_cpu_feature_supported()

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

On 8/12/25 03:06, Philippe Mathieu-Daudé wrote:
> +bool host_cpu_feature_supported(enum arm_features feat, bool can_emulate)
> +{
> +#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
> +    static enum { F_UNKN, F_SUPP, F_UNSUPP } supported[64] = { };
> +
> +    assert(feat < ARRAY_SIZE(supported));
> +    if (supported[feat] == F_UNKN) {
> +        supported[feat] = arm_hw_accel_cpu_feature_supported(feat, can_emulate);
> +    }
> +    return supported[feat] == F_SUPP;
> +#elif defined(CONFIG_TCG)
> +    return can_emulate;
> +#else
> +#error
> +#endif
> +}

How much startup time is saved by this cache?
This feels like premature optimization.

r~