File: maybe-uninit.rs

package info (click to toggle)
rustc 1.86.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid
  • size: 913,560 kB
  • sloc: xml: 158,127; python: 35,921; javascript: 19,689; sh: 19,600; cpp: 18,906; ansic: 13,124; asm: 4,376; makefile: 708; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (27 lines) | stat: -rw-r--r-- 624 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
//@ compile-flags: -Copt-level=3
//@ only-x86_64

#![crate_type = "rlib"]
#![allow(asm_sub_register)]

use std::arch::asm;
use std::mem::MaybeUninit;

// CHECK-LABEL: @int
#[no_mangle]
pub unsafe fn int(x: MaybeUninit<i32>) -> MaybeUninit<i32> {
    let y: MaybeUninit<i32>;
    asm!("/*{}{}*/", in(reg) x, out(reg) y);
    y
}

// CHECK-LABEL: @inout
#[no_mangle]
pub unsafe fn inout(mut x: i32) -> MaybeUninit<u32> {
    let mut y: MaybeUninit<u32>;
    asm!("/*{}*/", inout(reg) x => y);
    asm!("/*{}*/", inout(reg) y => x);
    asm!("/*{}*/", inlateout(reg) x => y);
    asm!("/*{}*/", inlateout(reg) y => x);
    y
}