// 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.

// compile-flags: -C no-prepopulate-passes

#![crate_type = "lib"]
#![feature(rustc_attrs)]

// Hack to get the correct size for the length part in slices
// CHECK: @helper([[USIZE:i[0-9]+]])
#[no_mangle]
fn helper(_: usize) {
}

// CHECK-LABEL: @ref_dst
#[no_mangle]
#[rustc_no_mir] // FIXME #27840 MIR has different codegen.
pub fn ref_dst(s: &[u8]) {
    // We used to generate an extra alloca and memcpy to ref the dst, so check that we copy
    // directly to the alloca for "x"
// CHECK: [[SRC:%[0-9]+]] = bitcast { i8*, [[USIZE]] }* %s to i8*
// CHECK: [[DST:%[0-9]+]] = bitcast { i8*, [[USIZE]] }* %x to i8*
// CHECK: call void @llvm.memcpy.{{.*}}(i8* [[DST]], i8* [[SRC]],
    let x = &*s;
}