src/test/run-pass/ctfe/bswap-const.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // run-pass
  12
  13 #![feature(core_intrinsics)]
  14
  15 use std::intrinsics;
  16
  17 const SWAPPED_U8: u8 = unsafe { intrinsics::bswap(0x12_u8) };
  18 const SWAPPED_U16: u16 = unsafe { intrinsics::bswap(0x12_34_u16) };
  19 const SWAPPED_I32: i32 = unsafe { intrinsics::bswap(0x12_34_56_78_i32) };
  20
  21 fn main() {
  22     assert_eq!(SWAPPED_U8, 0x12);
  23     assert_eq!(SWAPPED_U16, 0x34_12);
  24     assert_eq!(SWAPPED_I32, 0x78_56_34_12);
  25 }