| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Makes sure that zero-initializing large types is reasonably fast, |
| // Doing it incorrectly causes massive slowdown in LLVM during |
| // optimisation. |
| |
| // pretty-expanded FIXME #23616 |
| |
| #![feature(intrinsics, std_misc)] |
| |
| use std::thread; |
| |
| extern "rust-intrinsic" { |
| pub fn init<T>() -> T; |
| } |
| |
| const SIZE: usize = 1024 * 1024; |
| |
| fn main() { |
| // do the test in a new thread to avoid (spurious?) stack overflows |
| thread::spawn(|| { |
| let _memory: [u8; SIZE] = unsafe { init() }; |
| }).join(); |
| } |
