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    //! Implements `std::ops::Neg` for signed vector types.
    #![allow(unused)]

    macro_rules! impl_neg_op {
        ($id:ident, $elem_ty:ident) => {
            impl ::ops::Neg for $id {
                type Output = Self;
                #[inline]
                fn neg(self) -> Self {
                    Self::splat(-1 as $elem_ty) * self
                }
            }
        };
    }

    #[cfg(test)]
    macro_rules! test_neg_op {
        ($id:ident, $elem_ty:ident) => {
            #[test]
            fn neg() {
                use coresimd::simd::$id;
                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 nz = $id::splat(-(0 as $elem_ty));
                let no = $id::splat(-(1 as $elem_ty));
                let nt = $id::splat(-(2 as $elem_ty));
                let nf = $id::splat(-(4 as $elem_ty));

                assert_eq!(-z, nz);
                assert_eq!(-o, no);
                assert_eq!(-t, nt);
                assert_eq!(-f, nf);

                assert_eq!(z, -nz);
                assert_eq!(o, -no);
                assert_eq!(t, -nt);
                assert_eq!(f, -nf);
            }
        };
    }

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