src/test/ui/llvm-asm/llvm-asm-out-assign.rs

   1 // run-pass
   2
   3 #![feature(llvm_asm)]
   4 #![allow(deprecated)] // llvm_asm!s
   5
   6 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
   7 pub fn main() {
   8     let x: isize;
   9     unsafe {
  10         // Treat the output as initialization.
  11         llvm_asm!("mov $1, $0" : "=r"(x) : "r"(5_usize));
  12     }
  13     assert_eq!(x, 5);
  14
  15     let mut x = x + 1;
  16     assert_eq!(x, 6);
  17
  18     unsafe {
  19         // Assignment to mutable.
  20         llvm_asm!("mov $1, $0" : "=r"(x) : "r"(x + 7));
  21     }
  22     assert_eq!(x, 13);
  23 }
  24
  25 #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
  26 pub fn main() {}