34 lines
678 B
Rust
34 lines
678 B
Rust
|
//@ compile-flags: -O
|
||
|
|
#![feature(c_unwind)]
|
||
|
|
#![crate_type = "lib"]
|
||
|
|
|
||
|
|
pub struct Foo([u8; 1000]);
|
||
|
|
|
||
|
|
extern "C" {
|
||
|
|
fn init(p: *mut Foo);
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn new_from_uninit() -> Foo {
|
||
|
|
// CHECK-LABEL: new_from_uninit
|
||
|
|
// CHECK-NOT: call void @llvm.memcpy.
|
||
|
|
let mut x = std::mem::MaybeUninit::uninit();
|
||
|
|
unsafe {
|
||
|
|
init(x.as_mut_ptr());
|
||
|
|
x.assume_init()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
extern "C-unwind" {
|
||
|
|
fn init_unwind(p: *mut Foo);
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn new_from_uninit_unwind() -> Foo {
|
||
|
|
// CHECK-LABEL: new_from_uninit
|
||
|
|
// CHECK: call void @llvm.memcpy.
|
||
|
|
let mut x = std::mem::MaybeUninit::uninit();
|
||
|
|
unsafe {
|
||
|
|
init_unwind(x.as_mut_ptr());
|
||
|
|
x.assume_init()
|
||
|
|
}
|
||
|
|
}
|