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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/structs-enums/align-enum.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/structs-enums/align-enum.rs')
-rw-r--r-- | src/test/ui/structs-enums/align-enum.rs | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/align-enum.rs b/src/test/ui/structs-enums/align-enum.rs new file mode 100644 index 000000000..fa872caa3 --- /dev/null +++ b/src/test/ui/structs-enums/align-enum.rs @@ -0,0 +1,54 @@ +// 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); +} |