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    #![cfg(any(target_arch="x86", target_arch="x86_64"))]

    macro_rules! compile_env_matches_or_is_empty {
        ($envvar:tt, $feature_name:tt) => {
            (match option_env!($envvar) {
                None => true,
                Some(v) => v == $feature_name
            })
        }
    }

    macro_rules! is_x86_feature_detected_ {
        ($name:tt) => {
            // for testing purposes, we can make sure only one specific feature
            // is enabled by setting MMTEST_FEATURE=featurename (all others
            // disabled). This does not force it to be detected, it must also be.
            compile_env_matches_or_is_empty!("MMTEST_FEATURE", $name) && is_x86_feature_detected!($name)
        }
    }

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