You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dot.rs
    path of file: ./repos/lance/rust/lance-linalg/src/distance
    
    the code of the file until where you have to start completion: // Copyright 2023 Lance Developers.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Dot product.

use std::iter::Sum;
use std::ops::{AddAssign, Neg};
use std::sync::Arc;

use crate::Error;
u
    
    fn dot(x: &[f32], y: &[f32]) -> f32 {
        // Manually unrolled 8 times to get enough registers.
        // TODO: avx512 can unroll more
        let x_unrolled_chunks = x.chunks_exact(64);
        let y_unrolled_chunks = y.chunks_exact(64);

        // 8 float32 SIMD
        let x_aligned_chunks = x_unrolled_chunks.remainder().chunks_exact(8);
        let y_aligned_chunks = y_unrolled_chunks.remainder().chunks_exact(8);

        let sum = if x_aligned_chunks.remainder().is_empty() {
            0.0
        } else {
            debug_assert_eq!(
                x_aligned_chunks.remainder().len(),
                y_aligned_chunks.remainder().len()
            );
            x_aligned_chunks
                .remainder()
                .iter()
                .zip(y_aligned_chunks.remainder().iter())
                .map(|(&x, &y)| x * y)
                .sum()
        };

        let mut sum8 = f32x8::zeros();
        x_aligned_chunks
            .zip(y_aligned_chunks)
            .for_each(|(x_chunk, y_chunk)| unsafe {
                let x1 = f32x8::load_unaligned(x_chunk.as_ptr());
                let y1 = f32x8::load_unaligned(y_chunk.as_ptr());
                sum8 += x1 * y1;
            });

        let mut sum16 = f32x16::zeros();
        x_unrolled_chunks
            .zip(y_unrolled_chunks)
            .for_each(|(x, y)| unsafe {
                let x1 = f32x16::load_unaligned(x.as_ptr());
                let x2 = f32x16::load_unaligned(x.as_ptr().add(16));
                let x3 = f32x16::load_unaligned(x.as_ptr().add(32));
                let x4 = f32x16::load_unaligned(x.as_ptr().add(48));

                let y1 = f32x16::load_unaligned(y.as_ptr());
                let y2 = f32x16::load_unaligned(y.as_ptr().add(16));
                let y3 = f32x16::load_unaligned(y.as_ptr().add(32));
                let y4 = f32x16::load_unaligned(y.as_ptr().add(48));

                sum16 += (x1 * y1 + x2 * y2) + (x3 * y3 + x4 * y4);
            });
        sum16.reduce_sum() + sum8.reduce_sum() + sum
    }