41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
// compile-flags: -O
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(get_mut_unchecked, new_uninit)]
|
|
|
|
use std::sync::Arc;
|
|
|
|
// CHECK-LABEL: @new_from_array
|
|
#[no_mangle]
|
|
pub fn new_from_array(x: u64) -> Arc<[u64]> {
|
|
// Ensure that we only generate one alloca for the array.
|
|
|
|
// CHECK: alloca
|
|
// CHECK-SAME: [1000 x i64]
|
|
// CHECK-NOT: alloca
|
|
let array = [x; 1000];
|
|
Arc::new(array)
|
|
}
|
|
|
|
// CHECK-LABEL: @new_uninit
|
|
#[no_mangle]
|
|
pub fn new_uninit(x: u64) -> Arc<[u64; 1000]> {
|
|
// CHECK: call alloc::sync::arcinner_layout_for_value_layout
|
|
// CHECK-NOT: call alloc::sync::arcinner_layout_for_value_layout
|
|
let mut arc = Arc::new_uninit();
|
|
unsafe { Arc::get_mut_unchecked(&mut arc) }.write([x; 1000]);
|
|
unsafe { arc.assume_init() }
|
|
}
|
|
|
|
// CHECK-LABEL: @new_uninit_slice
|
|
#[no_mangle]
|
|
pub fn new_uninit_slice(x: u64) -> Arc<[u64]> {
|
|
// CHECK: call alloc::sync::arcinner_layout_for_value_layout
|
|
// CHECK-NOT: call alloc::sync::arcinner_layout_for_value_layout
|
|
let mut arc = Arc::new_uninit_slice(1000);
|
|
for elem in unsafe { Arc::get_mut_unchecked(&mut arc) } {
|
|
elem.write(x);
|
|
}
|
|
unsafe { arc.assume_init() }
|
|
}
|