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    //! Mask select method
    #![allow(unused)]

    /// Implements mask select method
    macro_rules! impl_mask_select {
        ($id:ident, $elem_ty:ident, $elem_count:expr) => {
            impl $id {
                /// Selects elements of `a` and `b` using mask.
                ///
                /// For each lane, the result contains the element of `a` if the
                /// mask is true, and the element of `b` otherwise.
                #[inline]
                pub fn select<T>(self, a: T, b: T) -> T
                where
                    T: super::api::Lanes<[u32; $elem_count]>,
                {
                    use coresimd::simd_llvm::simd_select;
                    unsafe { simd_select(self, a, b) }
                }
            }
        };
    }

    #[cfg(test)]
    macro_rules! test_mask_select {
        ($mask_id:ident, $vec_id:ident, $elem_ty:ident) => {
            #[test]
            fn select() {
                use coresimd::simd::{$mask_id, $vec_id};
                let o = 1 as $elem_ty;
                let t = 2 as $elem_ty;

                let a = $vec_id::splat(o);
                let b = $vec_id::splat(t);
                let m = a.lt(b);
                assert_eq!(m.select(a, b), a);

                let m = b.lt(a);
                assert_eq!(m.select(b, a), a);

                let mut c = a;
                let mut d = b;
                let mut m_e = $mask_id::splat(false);
                for i in 0..$vec_id::lanes() {
                    if i % 2 == 0 {
                        let c_tmp = c.extract(i);
                        c = c.replace(i, d.extract(i));
                        d = d.replace(i, c_tmp);
                    } else {
                        m_e = m_e.replace(i, true);
                    }
                }

                let m = c.lt(d);
                assert_eq!(m_e, m);
                assert_eq!(m.select(c, d), a);
            }
        };
    }

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