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    //! Implements the `FromBits` trait for vector types, which performs bitwise
    //! lossless transmutes between equally-sized vector types.

    macro_rules! impl_from_bits_ {
        ($to:ident: $($from:ident),+) => {
            $(
                impl ::simd::FromBits<$from> for $to {
                    #[inline]
                    fn from_bits(f: $from) -> $to {
                        unsafe { mem::transmute(f) }
                    }
                }
            )+
        }
    }

    macro_rules! impl_from_bits {
        ($to:ident: $elem_ty:ident, $test_mod:ident | $($from:ident),+) => {
            impl_from_bits_!($to: $($from),+);

            #[cfg(test)]
            mod $test_mod {
                $(
                    #[test]
                    fn $from() {
                        use ::coresimd::simd::{$from, $to, FromBits, IntoBits};
                        use ::std::{mem, default};
                        use default::Default;
                        assert_eq!(mem::size_of::<$from>(),
                                   mem::size_of::<$to>());
                        let a: $from = $from::default();
                        let b_0: $to = FromBits::from_bits(a);
                        let b_1: $to = a.into_bits();
                        assert_eq!(b_0, b_1);
                    }
                )+
            }
        }
    }

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