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1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | #![feature(repr_simd, test)] | |
12 | ||
13 | extern crate test; | |
14 | ||
15 | #[repr(simd)] | |
16 | pub struct Mu64(pub u64, pub u64, pub u64, pub u64); | |
17 | ||
18 | fn main() { | |
19 | // This ensures an unaligned pointer even in optimized builds, though LLVM | |
20 | // gets enough type information to actually not mess things up in that case, | |
21 | // but at the time of writing this, it's enough to trigger the bug in | |
22 | // non-optimized builds | |
23 | unsafe { | |
24 | let memory = &mut [0u64; 8] as *mut _ as *mut u8; | |
25 | let misaligned_ptr: &mut [u8; 32] = { | |
26 | std::mem::transmute(memory.offset(1)) | |
27 | }; | |
28 | *misaligned_ptr = std::mem::transmute(Mu64(1, 1, 1, 1)); | |
29 | test::black_box(memory); | |
30 | } | |
31 | } |