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    //! Implements the `FromBits` trait for vector types, which performs bitwise
    //! lossless transmutes between equally-sized vector types.
    #![allow(unused)]

    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: $($from:ident),+) => {
            vector_impl!([impl_from_bits__, $to: $($from),+]);
        }
    }

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

            $test_macro!(
                #[cfg(test)]
                mod $test_mod {
                    $(
                        #[test]
                        fn $from() {
                            use ::coresimd::simd::*;
                            use ::std::mem;
                            assert_eq!(mem::size_of::<$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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