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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`
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.