ed3810bf5e
Because of its "magic" order-of-evaluation semantics, `move_val_init` must be lowered during MIR construction in order to work.
29 lines
897 B
Rust
29 lines
897 B
Rust
// Copyright 2017 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
|
|
|
|
#![feature(core_intrinsics)]
|
|
#![crate_type = "lib"]
|
|
|
|
// test that `move_val_init` actually avoids big allocas
|
|
|
|
use std::intrinsics::move_val_init;
|
|
|
|
pub struct Big {
|
|
pub data: [u8; 65536]
|
|
}
|
|
|
|
// CHECK-LABEL: @test_mvi
|
|
#[no_mangle]
|
|
pub unsafe fn test_mvi(target: *mut Big, make_big: fn() -> Big) {
|
|
// CHECK: call void %1(%Big*{{[^%]*}} %0)
|
|
move_val_init(target, make_big());
|
|
}
|