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cfg_if! {
    if #[cfg(all(
        target_feature = "sse2",
        any(target_arch = "x86", target_arch = "x86_64")
    ))] {
        mod pclmulqdq;
        pub use self::pclmulqdq::State;
    } else if #[cfg(all(feature = "nightly", target_arch = "aarch64"))] {
        mod aarch64;
        pub use self::aarch64::State;
    } else {
        #[derive(Clone)]
        pub enum State {}
        impl State {
            pub fn new(_: u32) -> Option<Self> {
                None
            }

            pub fn update(&mut self, _buf: &[u8]) {
                match *self {}
            }

            pub fn finalize(self) -> u32 {
                match self{}
            }

            pub fn reset(&mut self) {
                match *self {}
            }

            pub fn combine(&mut self, _other: u32, _amount: u64) {
                match *self {}
            }
        }
    }
}