rust/src/test/run-pass/i128-ffi.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// MSVC doesn't support 128 bit integers, and other Windows
// C compilers have very inconsistent views on how the ABI
// should look like.

// ignore-windows

// Ignore 32 bit targets:
// ignore-x86
// ignore-arm

// ignore-emscripten

#![feature(i128_type)]

#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
    fn identity(f: u128) -> u128;
    fn square(f: i128) -> i128;
    fn sub(f: i128, f: i128) -> i128;
}

fn main() {
    unsafe {
        let a = 0x734C_C2F2_A521;
        let b = 0x33EE_0E2A_54E2_59DA_A0E7_8E41;
        let b_out = identity(b);
        assert_eq!(b, b_out);
        let a_square = square(a);
        assert_eq!(b, a_square as u128);
        let k = 0x1234_5678_9ABC_DEFF_EDCB_A987_6543_210;
        let k_d = 0x2468_ACF1_3579_BDFF_DB97_530E_CA86_420;
        let k_out = sub(k_d, k);
        assert_eq!(k, k_out);
    }
}