rust/tests/codegen/asm-maybe-uninit.rs

28 lines
613 B
Rust

//@ compile-flags: -O
//@ 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
}