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: wasm32.rs
    path of file: ./repos/fast_image_resize/src/alpha/u8x4
    
    the code of the file until where you have to start completion: use std::arch::wasm32::*;

use crate::pixels::U8x4;
use crate::wasm32_utils;
use crate::{ImageView, ImageViewMut};

use super::native;

pub(crate) unsafe fn multiply_alpha(
    src_image: &ImageView<U8x4>,
    dst_image
    
unsafe fn multiply_alpha_row(src_row: &[U8x4], dst_row: &mut [U8x4]) {
    let src_chunks = src_row.chunks_exact(4);
    let src_remainder = src_chunks.remainder();
    let mut dst_chunks = dst_row.chunks_exact_mut(4);
    let src_dst = src_chunks.zip(&mut dst_chunks);
    // A simple for-loop in this case is as fast as implementation with pre-reading
    for (src, dst) in src_dst {
        let mut pixels = v128_load(src.as_ptr() as *const v128);
        pixels = multiply_alpha_4_pixels(pixels);
        v128_store(dst.as_mut_ptr() as *mut v128, pixels);
    }

    if !src_remainder.is_empty() {
        let dst_reminder = dst_chunks.into_remainder();
        native::multiply_alpha_row(src_remainder, dst_reminder);
    }
}