55 lines
1.1 KiB
Rust
55 lines
1.1 KiB
Rust
// run-pass
|
|
#![allow(dead_code)]
|
|
|
|
use std::mem;
|
|
|
|
// Raising alignment
|
|
#[repr(align(16))]
|
|
enum Align16 {
|
|
Foo { foo: u32 },
|
|
Bar { bar: u32 },
|
|
}
|
|
|
|
// Raise alignment by maximum
|
|
#[repr(align(1), align(16))]
|
|
#[repr(align(32))]
|
|
#[repr(align(4))]
|
|
enum Align32 {
|
|
Foo,
|
|
Bar,
|
|
}
|
|
|
|
// Not reducing alignment
|
|
#[repr(align(4))]
|
|
enum AlsoAlign16 {
|
|
Foo { limb_with_align16: Align16 },
|
|
Bar,
|
|
}
|
|
|
|
// No niche for discriminant when used as limb
|
|
#[repr(align(16))]
|
|
struct NoNiche16(u64, u64);
|
|
|
|
// Discriminant will require extra space, but enum needs to stay compatible
|
|
// with alignment 16
|
|
#[repr(align(1))]
|
|
enum AnotherAlign16 {
|
|
Foo { limb_with_noniche16: NoNiche16 },
|
|
Bar,
|
|
Baz,
|
|
}
|
|
|
|
fn main() {
|
|
assert_eq!(mem::align_of::<Align16>(), 16);
|
|
assert_eq!(mem::size_of::<Align16>(), 16);
|
|
|
|
assert_eq!(mem::align_of::<Align32>(), 32);
|
|
assert_eq!(mem::size_of::<Align32>(), 32);
|
|
|
|
assert_eq!(mem::align_of::<AlsoAlign16>(), 16);
|
|
assert_eq!(mem::size_of::<AlsoAlign16>(), 16);
|
|
|
|
assert_eq!(mem::align_of::<AnotherAlign16>(), 16);
|
|
assert_eq!(mem::size_of::<AnotherAlign16>(), 32);
|
|
}
|