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    //! Implements integer shifts.
    #![allow(unused)]

    macro_rules! impl_vector_shifts {
        ($id:ident, $elem_ty:ident) => {
            impl ::ops::Shl<$id> for $id {
                type Output = Self;
                #[inline]
                fn shl(self, other: Self) -> Self {
                    use coresimd::simd_llvm::simd_shl;
                    unsafe { simd_shl(self, other) }
                }
            }
            impl ::ops::Shr<$id> for $id {
                type Output = Self;
                #[inline]
                fn shr(self, other: Self) -> Self {
                    use coresimd::simd_llvm::simd_shr;
                    unsafe { simd_shr(self, other) }
                }
            }
            impl ::ops::ShlAssign<$id> for $id {
                #[inline]
                fn shl_assign(&mut self, other: Self) {
                    *self = *self << other;
                }
            }
            impl ::ops::ShrAssign<$id> for $id {
                #[inline]
                fn shr_assign(&mut self, other: Self) {
                    *self = *self >> other;
                }
            }
        };
    }

    #[cfg(test)]
    macro_rules! test_vector_shift_ops {
        ($id:ident, $elem_ty:ident) => {
            #[test]
            fn shift_ops() {
                use coresimd::simd::$id;
                use std::mem;
                let z = $id::splat(0 as $elem_ty);
                let o = $id::splat(1 as $elem_ty);
                let t = $id::splat(2 as $elem_ty);
                let f = $id::splat(4 as $elem_ty);

                let max =
                    $id::splat((mem::size_of::<$elem_ty>() * 8 - 1) as $elem_ty);

                // shr
                assert_eq!(z >> z, z);
                assert_eq!(z >> o, z);
                assert_eq!(z >> t, z);
                assert_eq!(z >> t, z);

                assert_eq!(o >> z, o);
                assert_eq!(t >> z, t);
                assert_eq!(f >> z, f);
                assert_eq!(f >> max, z);

                assert_eq!(o >> o, z);
                assert_eq!(t >> o, o);
                assert_eq!(t >> t, z);
                assert_eq!(f >> o, t);
                assert_eq!(f >> t, o);
                assert_eq!(f >> max, z);

                // shl
                assert_eq!(z << z, z);
                assert_eq!(o << z, o);
                assert_eq!(t << z, t);
                assert_eq!(f << z, f);
                assert_eq!(f << max, z);

                assert_eq!(o << o, t);
                assert_eq!(o << t, f);
                assert_eq!(t << o, f);

                {
                    // shr_assign
                    let mut v = o;
                    v >>= o;
                    assert_eq!(v, z);
                }
                {
                    // shl_assign
                    let mut v = o;
                    v <<= o;
                    assert_eq!(v, t);
                }
            }
        };
    }

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