Skip to content

Document target_has_atomic_primitive_alignment #2273

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
ehuss wants to merge 1 commit into
base: master
Choose a base branch
from
+19 −0
Open

Document target_has_atomic_primitive_alignment #2273

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions src/conditional-compilation.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,25 @@ Possible values:
* `"128"`
* `"ptr"`

r[cfg.target_has_atomic_primitive_alignment]
### `target_has_atomic_primitive_alignment`

r[cfg.target_has_atomic_primitive_alignment.def]
Key-value option set for each bit width where the corresponding [atomic][core::sync::atomic] type has the same alignment as the equivalent integer type.

> [!NOTE]
> The alignment is usually the same for a given bit width. However, on some targets such as 32-bit x86, 64-bit atomic types such as [`AtomicI64`][core::sync::atomic::AtomicI64] have an alignment of 8 bytes while `i64` is only aligned to 4 bytes. In this situation, `target_has_atomic_primitive_alignment = "64"` is not set.

r[cfg.target_has_atomic_primitive_alignment.values]
Possible values:

* `"8"`
* `"16"`
* `"32"`
* `"64"`
* `"128"`
* `"ptr"`

r[cfg.test]
### `test`

Expand Down
Loading