mirror of https://github.com/rust-lang/rust
28 lines
613 B
Rust
28 lines
613 B
Rust
//@ compile-flags: -O
|
|
//@ only-x86_64
|
|
|
|
#![crate_type = "rlib"]
|
|
#![allow(asm_sub_register)]
|
|
|
|
use std::mem::MaybeUninit;
|
|
use std::arch::asm;
|
|
|
|
// 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
|
|
}
|