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    //! Exact vector square-root
    #![allow(dead_code)]
    use coresimd::simd::*;

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.sqrt.f32"]
        fn sqrt_f32(x: f32) -> f32;
        #[link_name = "llvm.sqrt.f64"]
        fn sqrt_f64(x: f64) -> f64;

        #[link_name = "llvm.sqrt.v2f32"]
        fn sqrt_v2f32(x: f32x2) -> f32x2;
        #[link_name = "llvm.sqrt.v4f32"]
        fn sqrt_v4f32(x: f32x4) -> f32x4;
        #[link_name = "llvm.sqrt.v8f32"]
        fn sqrt_v8f32(x: f32x8) -> f32x8;
        #[link_name = "llvm.sqrt.v16f32"]
        fn sqrt_v16f32(x: f32x16) -> f32x16;
        #[link_name = "llvm.sqrt.v2f64"]
        fn sqrt_v2f64(x: f64x2) -> f64x2;
        #[link_name = "llvm.sqrt.v4f64"]
        fn sqrt_v4f64(x: f64x4) -> f64x4;
        #[link_name = "llvm.sqrt.v8f64"]
        fn sqrt_v8f64(x: f64x8) -> f64x8;
    }

    pub(crate) trait FloatSqrt {
        fn sqrt(self) -> Self;
    }

    trait RawSqrt {
        fn raw_sqrt(self) -> Self;
    }

    impl RawSqrt for f32 {
        fn raw_sqrt(self) -> Self {
            unsafe { sqrt_f32(self) }
        }
    }

    impl RawSqrt for f64 {
        fn raw_sqrt(self) -> Self {
            unsafe { sqrt_f64(self) }
        }
    }

    macro_rules! impl_fsqrt {
        ($id:ident : $fn:ident) => {
            #[cfg(not(target_arch = "s390x"))]
            impl FloatSqrt for $id {
                fn sqrt(self) -> Self {
                    unsafe { $fn(self) }
                }
            }
            // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/501
            #[cfg(target_arch = "s390x")]
            impl FloatSqrt for $id {
                fn sqrt(self) -> Self {
                    let mut v = $id::splat(0.);
                    for i in 0..$id::lanes() {
                        v = v.replace(i, self.extract(i).raw_sqrt());
                    }
                    v
                }
            }

        };
    }

    impl_fsqrt!(f32x2: sqrt_v2f32);
    impl_fsqrt!(f32x4: sqrt_v4f32);
    impl_fsqrt!(f32x8: sqrt_v8f32);
    impl_fsqrt!(f32x16: sqrt_v16f32);
    impl_fsqrt!(f64x2: sqrt_v2f64);
    impl_fsqrt!(f64x4: sqrt_v4f64);
    impl_fsqrt!(f64x8: sqrt_v8f64);

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