1 // Copyright 2015 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.
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.
11 // Makes sure that zero-initializing large types is reasonably fast,
12 // Doing it incorrectly causes massive slowdown in LLVM during
15 #![feature(intrinsics)]
17 use std::thread::Thread;
19 extern "rust-intrinsic" {
20 pub fn init<T>() -> T;
23 const SIZE: usize = 1024 * 1024;
26 // do the test in a new thread to avoid (spurious?) stack overflows
27 let _ = Thread::scoped(|| {
28 let _memory: [u8; SIZE] = unsafe { init() };