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    // Copyright 2016 - 2018 Ulrik Sverdrup "bluss"
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    // Unroll only in non-debug builds

    #[cfg(not(debug_assertions))]
    macro_rules! repeat {
        (1 $e:expr) => { $e; };
        (2 $e:expr) => { $e;$e; };
        (3 $e:expr) => { $e;$e; $e; };
        (4 $e:expr) => { $e;$e; $e;$e; };
        (5 $e:expr) => { $e;$e; $e;$e; $e; };
        (6 $e:expr) => { $e;$e; $e;$e; $e;$e; };
        (7 $e:expr) => { $e;$e; $e;$e; $e;$e; $e; };
        (8 $e:expr) => { $e;$e; $e;$e; $e;$e; $e;$e; };
    }

    #[cfg(debug_assertions)]
    macro_rules! loop4 {
        ($i:ident, $e:expr) => {
            for $i in 0..4 { $e }
        }
    }

    #[cfg(not(debug_assertions))]
    macro_rules! loop4 {
        ($i:ident, $e:expr) => {{
            let $i = 0; $e;
            let $i = 1; $e;
            let $i = 2; $e;
            let $i = 3; $e;
        }}
    }

    #[cfg(debug_assertions)]
    macro_rules! loop8 {
        ($i:ident, $e:expr) => {
            for $i in 0..8 { $e }
        }
    }

    #[cfg(not(debug_assertions))]
    macro_rules! loop8 {
        ($i:ident, $e:expr) => {{
            let $i = 0; $e;
            let $i = 1; $e;
            let $i = 2; $e;
            let $i = 3; $e;
            let $i = 4; $e;
            let $i = 5; $e;
            let $i = 6; $e;
            let $i = 7; $e;
        }}
    }

    #[cfg(debug_assertions)]
    macro_rules! unroll_by {
        ($by:tt => $ntimes:expr, $e:expr) => {
            for _ in 0..$ntimes { $e }
        }
    }

    #[cfg(not(debug_assertions))]
    macro_rules! unroll_by {
        ($by:tt => $ntimes:expr, $e:expr) => {{
            let k = $ntimes;
            for _ in 0..k / $by {
                repeat!($by $e);
            }
            for _ in 0..k % $by {
                $e
            }
        }}
    }

    #[cfg(debug_assertions)]
    macro_rules! unroll_by_with_last {
        ($by:tt => $ntimes:expr, $is_last:ident, $e:expr) => {{
            let k = $ntimes - 1;
            let $is_last = false;
            for _ in 0..k {
                $e;
            }
            let $is_last = true;
            #[allow(unused_assignments)]
            $e;
        }}
    }

    #[cfg(not(debug_assertions))]
    macro_rules! unroll_by_with_last {
        ($by:tt => $ntimes:expr, $is_last:ident, $e:expr) => {{
            let k = $ntimes - 1;
            let $is_last = false;
            for _ in 0..k / $by {
                repeat!($by $e);
            }
            for _ in 0..k % $by {
                $e;
            }
            let $is_last = true;
            #[allow(unused_assignments)]
            $e;
        }}
    }

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