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rust/compiler/rustc_target
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Michael Goulet fc557576a4
Rollup merge of #112150 - taiki-e:apple-atomic-128, r=Amanieu 
Support 128-bit atomics on all x86_64 Apple targets

On x86_64, we currently set `max_atomic_width` to 128 only on macOS.

ad8304a0d5/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs (L8)

However, other x86_64 Apple targets (iOS, tvOS, and watchOS) are also core2+ and support cmpxchg16b.

ad8304a0d5/compiler/rustc_target/src/spec/apple_base.rs (L71-L76)

```console
# Script to get targets that support cmpxchg16b by default:
$ (for target in $(rustc --print target-list); do [[ $target == "x86_64"* ]] && rustc --print cfg --target "$target" | grep -q cmpxchg16b && echo "$target"; done)
x86_64-apple-darwin
x86_64-apple-ios
x86_64-apple-ios-macabi
x86_64-apple-tvos
x86_64-apple-watchos-sim
x86_64h-apple-darwin
```

r? `@Amanieu`
2023-06-01 23:07:38 -07:00
..
src Rollup merge of #112150 - taiki-e:apple-atomic-128, r=Amanieu 2023-06-01 23:07:38 -07:00
Cargo.toml drop unused deps, gate libc under unix for one crate 2023-04-22 15:22:21 +03:00
README.md Fix outdated crate names in compiler docs 2021-04-08 11:12:14 -05:00

README.md

rustc_target contains some very low-level details that are specific to different compilation targets and so forth.

For more information about how rustc works, see the rustc dev guide.