// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

#![allow(overflowing_literals)]

/// FFFFFF00/8000
/// 00100 FF000000
/// 01010 7F00FFFF
#[test]
fn divs() {
    let dst: i32 = 0xFFFF_FF00;
    let src: i32 = 0xFFFF_8000;

    let mut value = dst as i32 as u64;
    for _ in 0..32 {
        value <<= 1;
        let a = (value >> 32) as i32;
        let (res, v) = a.overflowing_sub(src);
        if v {
            continue;
        }
        value = (res as u64) << 32 | value as u32 as u64;
        value |= !v as u64;
    }

    let quot = value as u32;
    let rem = (value >> 32) as u32;
    println!("divs {:#X} {:#X} {quot:#X} {rem:#X}", dst / src, dst % src);
}

#[test]
fn divu() {
    // let dst: u32 = 1729;
    // let src: u32 = 10;
    let dst: u32 = 0x7FFF_FFFF;
    let src: u32 = 0x8000;

    let mut value = dst as u64;
    for _ in 0..32 {
        value <<= 1;
        let a = (value >> 32) as u32;
        let (res, v) = a.overflowing_sub(src);
        if v {
            continue;
        }
        value = (res as u64) << 32 | value as u32 as u64;
        value |= !v as u64;
    }

    let quot = value as u32;
    let rem = (value >> 32) as u32;
    println!("divu {:#X} {:#X} {quot:#X} {rem:#X}", dst / src, dst % src);
}