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add tests for field ordering optimization

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This commit is contained in:
The 8472 2022-10-07 20:35:34 +02:00
parent a9128d8927
commit c1f392dbc0
1 changed files with 21 additions and 0 deletions
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21
src/test/ui/structs-enums/type-sizes.rs
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@ -3,6 +3,7 @@
#![allow(non_camel_case_types)]
#![allow(dead_code)]
#![feature(never_type)]
#![feature(pointer_is_aligned)]
use std::mem::size_of;
use std::num::NonZeroU8;
@ -168,6 +169,18 @@ pub enum EnumManyVariant<X> {
_F0, _F1, _F2, _F3, _F4, _F5, _F6, _F7, _F8, _F9, _FA, _FB, _FC, _FD, _FE, _FF,
}
struct Reorder4 {
a: u32,
b: u8,
ary: [u8; 4],
}
struct Reorder2 {
a: u16,
b: u8,
ary: [u8; 6],
}
pub fn main() {
assert_eq!(size_of::<u8>(), 1 as usize);
assert_eq!(size_of::<u32>(), 4 as usize);
@ -249,4 +262,12 @@ pub fn main() {
assert_eq!(size_of::<EnumManyVariant<Option<NicheU16>>>(), 4);
assert_eq!(size_of::<EnumManyVariant<Option2<NicheU16,u8>>>(), 6);
assert_eq!(size_of::<EnumManyVariant<Option<(NicheU16,u8)>>>(), 6);
let v = Reorder4 {a: 0, b: 0, ary: [0; 4]};
assert_eq!(size_of::<Reorder4>(), 12);
assert!((&v.ary).as_ptr().is_aligned_to(4), "[u8; 4] should group with align-4 fields");
let v = Reorder2 {a: 0, b: 0, ary: [0; 6]};
assert_eq!(size_of::<Reorder2>(), 10);
assert!((&v.ary).as_ptr().is_aligned_to(2), "[u8; 6] should group with align-2 fields");
}