#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(portable_simd)]
use core::simd::prelude::*;
fn basic_simd_sum(x: &[f32]) -> f32 {
    use std::ops::Add;
    let (prefix, middle, suffix) = x.as_simd();
    let sums = f32x4::from_array([
        prefix.iter().copied().sum(),
        0.0,
        0.0,
        suffix.iter().copied().sum(),
    ]);
    let sums = middle.iter().copied().fold(sums, f32x4::add);
    sums.reduce_sum()
}
fn main() {
    let short = &[1, 2, 3];
    let (prefix, middle, suffix) = short.as_simd::<4>();
    assert_eq!(middle, []);
    let it = prefix.iter().chain(suffix).copied();
    assert_eq!(it.collect::< Vec < _ >> (), vec![1, 2, 3]);
    let numbers: Vec<f32> = (1..101).map(|x| x as _).collect();
    assert_eq!(basic_simd_sum(& numbers[1..99]), 4949.0);
}