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/u16x2
    
    the code of the file until where you have to start completion: use std::arch::wasm32::*;

use crate::pixels::U16x2;
use crate::utils::foreach_with_pre_reading;
use crate::{ImageView, ImageViewMut};

use super::native;

pub(crate) unsafe fn multiply_alpha(
    src_image: &ImageView<U16x2>,
    dst_image: &mut ImageViewMut<U16x2>,
) {
    let src_rows = src_image.iter_rows(0);
    let dst_rows = dst_image.iter_rows_mut();

    for (src_row, dst_row) in src_rows.zip(dst_rows) {
        multiply_alpha_row(src_row, dst_row);
    }
}

pub(crate) unsafe fn multiply_alpha_inplace(image: &mut ImageViewMut<U16x2>) {
    for row in image.iter_rows_mut() {
        multiply_alpha_row_inplace(row);
    }
}

#[inline]
#[target_feature(enable = "simd128")]
unsafe fn multiply_alp
    
unsafe fn divide_alpha_4_pixels(pixels: v128) -> v128 {
    const ALPHA_MASK: v128 = u32x4(0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000);
    const LUMA_MASK: v128 = u32x4(0xffff, 0xffff, 0xffff, 0xffff);
    const ALPHA_MAX: v128 = f32x4(65535.0, 65535.0, 65535.0, 65535.0);
    /*
       |L0   A0  | |L1   A1  | |L2   A2  | |L3   A3  |
       |0001 0203| |0405 0607| |0809 1011| |1213 1415|
    */
    const ALPHA32_SH: v128 = i8x16(2, 3, -1, -1, 6, 7, -1, -1, 10, 11, -1, -1, 14, 15, -1, -1);

    let alpha_f32x4 = f32x4_convert_i32x4(u8x16_swizzle(pixels, ALPHA32_SH));
    let luma_f32x4 = f32x4_convert_i32x4(v128_and(pixels, LUMA_MASK));
    let scaled_luma_f32x4 = f32x4_mul(luma_f32x4, ALPHA_MAX);
    // In case of zero division the result will be u32::MAX or 0.
    let divided_luma_u32x4 = u32x4_trunc_sat_f32x4(f32x4_div(scaled_luma_f32x4, alpha_f32x4));
    // All u32::MAX values in arguments will interpreted as -1i32.
    // u16x8_narrow_i32x4() converts all negative values into 0.
    let divided_luma_u16 = u16x8_narrow_i32x4(divided_luma_u32x4, divided_luma_u32x4);

    let alpha = v128_and(pixels, ALPHA_MASK);
    v128_or(u32x4_extend_low_u16x8(divided_luma_u16), alpha)
}