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    //! Lane-wise vector comparisons returning boolean vectors.

    macro_rules! impl_cmp {
        ($id:ident, $bool_ty:ident) => {
            impl $id {
                /// Lane-wise equality comparison.
                #[inline]
                pub fn eq(self, other: $id) -> $bool_ty {
                    unsafe { simd_eq(self, other) }
                }

                /// Lane-wise inequality comparison.
                #[inline]
                pub fn ne(self, other: $id) -> $bool_ty {
                    unsafe { simd_ne(self, other) }
                }

                /// Lane-wise less-than comparison.
                #[inline]
                pub fn lt(self, other: $id) -> $bool_ty {
                    unsafe { simd_lt(self, other) }
                }

                /// Lane-wise less-than-or-equals comparison.
                #[inline]
                pub fn le(self, other: $id) -> $bool_ty {
                    unsafe { simd_le(self, other) }
                }

                /// Lane-wise greater-than comparison.
                #[inline]
                pub fn gt(self, other: $id) -> $bool_ty {
                    unsafe { simd_gt(self, other) }
                }

                /// Lane-wise greater-than-or-equals comparison.
                #[inline]
                pub fn ge(self, other: $id) -> $bool_ty {
                    unsafe { simd_ge(self, other) }
                }
            }
        }
    }

    macro_rules! impl_bool_cmp {
        ($id:ident, $bool_ty:ident) => {
            impl $id {
                /// Lane-wise equality comparison.
                #[inline]
                pub fn eq(self, other: $id) -> $bool_ty {
                    unsafe { simd_eq(self, other) }
                }

                /// Lane-wise inequality comparison.
                #[inline]
                pub fn ne(self, other: $id) -> $bool_ty {
                    unsafe { simd_ne(self, other) }
                }

                /// Lane-wise less-than comparison.
                #[inline]
                pub fn lt(self, other: $id) -> $bool_ty {
                    unsafe { simd_gt(self, other) }
                }

                /// Lane-wise less-than-or-equals comparison.
                #[inline]
                pub fn le(self, other: $id) -> $bool_ty {
                    unsafe { simd_ge(self, other) }
                }

                /// Lane-wise greater-than comparison.
                #[inline]
                pub fn gt(self, other: $id) -> $bool_ty {
                    unsafe { simd_lt(self, other) }
                }

                /// Lane-wise greater-than-or-equals comparison.
                #[inline]
                pub fn ge(self, other: $id) -> $bool_ty {
                    unsafe { simd_le(self, other) }
                }
            }
        }
    }

    #[cfg(test)]
    #[macro_export]
    macro_rules! test_cmp {
        ($id:ident, $elem_ty:ident, $bool_ty:ident,
         $true:expr, $false:expr) => {
            #[test]
            fn cmp() {
                use ::coresimd::simd::*;

                let a = $id::splat($false);
                let b = $id::splat($true);

                let r = a.lt(b);
                let e = $bool_ty::splat(true);
                assert!(r == e);
                let r = a.le(b);
                assert!(r == e);

                let e = $bool_ty::splat(false);
                let r = a.gt(b);
                assert!(r == e);
                let r = a.ge(b);
                assert!(r == e);
                let r = a.eq(b);
                assert!(r == e);

                let mut a = a;
                let mut b = b;
                let mut e = e;
                for i in 0..$id::lanes() {
                    if i % 2 == 0 {
                        a = a.replace(i, $false);
                        b = b.replace(i, $true);
                        e = e.replace(i, true);
                    } else {
                        a = a.replace(i, $true);
                        b = b.replace(i, $false);
                        e = e.replace(i, false);
                    }
                }
                let r = a.lt(b);
                assert!(r == e);
            }
        }
    }

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