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Rollup merge of rust-lang#99767 - LeSeulArtichaut:stable-target-featu…
…re-11, r=estebank Stabilize `#![feature(target_feature_11)]` ## Stabilization report ### Summary Allows for safe functions to be marked with `#[target_feature]` attributes. Functions marked with `#[target_feature]` are generally considered as unsafe functions: they are unsafe to call, cannot be assigned to safe function pointers, and don't implement the `Fn*` traits. However, calling them from other `#[target_feature]` functions with a superset of features is safe. ```rust // Demonstration function #[target_feature(enable = "avx2")] fn avx2() {} fn foo() { // Calling `avx2` here is unsafe, as we must ensure // that AVX is available first. unsafe { avx2(); } } #[target_feature(enable = "avx2")] fn bar() { // Calling `avx2` here is safe. avx2(); } ``` ### Test cases Tests for this feature can be found in [`src/test/ui/rfcs/rfc-2396-target_feature-11/`](https://github.com/rust-lang/rust/tree/b67ba9ba208ac918228a18321fc3a11a99b1c62b/src/test/ui/rfcs/rfc-2396-target_feature-11/). ### Edge cases - rust-lang#73631 Closures defined inside functions marked with `#[target_feature]` inherit the target features of their parent function. They can still be assigned to safe function pointers and implement the appropriate `Fn*` traits. ```rust #[target_feature(enable = "avx2")] fn qux() { let my_closure = || avx2(); // this call to `avx2` is safe let f: fn() = my_closure; } ``` This means that in order to call a function with `#[target_feature]`, you must show that the target-feature is available while the function executes *and* for as long as whatever may escape from that function lives. ### Documentation - Reference: rust-lang/reference#1181 --- cc tracking issue rust-lang#69098 r? `@ghost`
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tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.rs
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tests/ui/rfcs/rfc-2396-target_feature-11/feature-gate-target_feature_11.stderr
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// only-x86_64 | ||
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#![feature(target_feature_11)] | ||
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#[target_feature(enable = "avx")] | ||
fn foo() {} | ||
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// check-pass | ||
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#![feature(target_feature_11)] | ||
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struct S<T>(T) | ||
where | ||
[T; (|| {}, 1).1]: Copy; | ||
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