| // Copyright 2012-2014 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. |
| |
| |
| #![feature(asm)] |
| |
| #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] |
| pub fn main() { |
| let x: isize; |
| unsafe { |
| // Treat the output as initialization. |
| asm!("mov $1, $0" : "=r"(x) : "r"(5_usize)); |
| } |
| assert_eq!(x, 5); |
| |
| let mut x = x + 1; |
| assert_eq!(x, 6); |
| |
| unsafe { |
| // Assignment to mutable. |
| asm!("mov $1, $0" : "=r"(x) : "r"(x + 7)); |
| } |
| assert_eq!(x, 13); |
| } |
| |
| #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))] |
| pub fn main() {} |