//@ run-pass //@ ignore-emscripten FIXME(#45351) #![feature(repr_simd, test)] extern crate test; #[repr(simd)] pub struct Mu64(pub [u64; 4]); fn main() { // This ensures an unaligned pointer even in optimized builds, though LLVM // gets enough type information to actually not mess things up in that case, // but at the time of writing this, it's enough to trigger the bug in // non-optimized builds unsafe { let memory = &mut [0u64; 8] as *mut _ as *mut u8; let misaligned_ptr: &mut [u8; 32] = { std::mem::transmute(memory.offset(1)) }; *misaligned_ptr = std::mem::transmute(Mu64([1, 1, 1, 1])); test::black_box(memory); } }