mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-04 12:44:40 +00:00
35 lines
1.2 KiB
Rust
35 lines
1.2 KiB
Rust
// run-pass
|
|
#![feature(core_intrinsics)]
|
|
|
|
use std::intrinsics::{ volatile_copy_memory, volatile_store, volatile_load,
|
|
volatile_copy_nonoverlapping_memory,
|
|
volatile_set_memory };
|
|
|
|
//
|
|
// This test ensures that volatile intrinsics can be specialised with
|
|
// zero-sized types and, in case of copy/set functions, can accept
|
|
// number of elements equal to zero.
|
|
//
|
|
fn main () {
|
|
let mut dst_pair = (1, 2);
|
|
let src_pair = (3, 4);
|
|
let mut dst_empty = ();
|
|
let src_empty = ();
|
|
|
|
const COUNT_0: usize = 0;
|
|
const COUNT_100: usize = 100;
|
|
|
|
unsafe {
|
|
volatile_copy_memory(&mut dst_pair, &dst_pair, COUNT_0);
|
|
volatile_copy_nonoverlapping_memory(&mut dst_pair, &src_pair, 0);
|
|
volatile_copy_memory(&mut dst_empty, &dst_empty, 100);
|
|
volatile_copy_nonoverlapping_memory(&mut dst_empty, &src_empty,
|
|
COUNT_100);
|
|
volatile_set_memory(&mut dst_empty, 0, COUNT_100);
|
|
volatile_set_memory(&mut dst_pair, 0, COUNT_0);
|
|
volatile_store(&mut dst_empty, ());
|
|
volatile_store(&mut dst_empty, src_empty);
|
|
volatile_load(&src_empty);
|
|
}
|
|
}
|