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
28
29
30
31
32
33
|
//@ run-pass
#![feature(repr_simd, intrinsics)]
extern "rust-intrinsic" {
fn simd_cast_ptr<T, U>(x: T) -> U;
fn simd_expose_addr<T, U>(x: T) -> U;
fn simd_from_exposed_addr<T, U>(x: T) -> U;
}
#[derive(Copy, Clone)]
#[repr(simd)]
struct V<T>([T; 2]);
fn main() {
unsafe {
let mut foo = 4i8;
let ptr = &mut foo as *mut i8;
let ptrs = V::<*mut i8>([ptr, core::ptr::null_mut()]);
// change constness and type
let const_ptrs: V<*const u8> = simd_cast_ptr(ptrs);
let exposed_addr: V<usize> = simd_expose_addr(const_ptrs);
let from_exposed_addr: V<*mut i8> = simd_from_exposed_addr(exposed_addr);
assert!(const_ptrs.0 == [ptr as *const u8, core::ptr::null()]);
assert!(exposed_addr.0 == [ptr as usize, 0]);
assert!(from_exposed_addr.0 == ptrs.0);
}
}
|
