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bors b583ede652 Auto merge of #99767 - LeSeulArtichaut:stable-target-feature-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/`](b67ba9ba20/src/test/ui/rfcs/rfc-2396-target_feature-11/).

### Edge cases

- https://github.com/rust-lang/rust/issues/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: https://github.com/rust-lang/reference/pull/1181

---
cc tracking issue #69098
r? `@ghost`
2023-02-28 01:14:56 +00:00
..
assembly Update the minimum external LLVM to 14 2023-02-10 16:06:25 -08:00
auxiliary
codegen Auto merge of #107921 - cjgillot:codegen-overflow-check, r=tmiasko 2023-02-19 18:17:26 +00:00
codegen-units
debuginfo Upgrade mingw-w64 on CI 2023-01-29 13:01:06 +01:00
incremental
mir-opt Auto merge of #99767 - LeSeulArtichaut:stable-target-feature-11, r=estebank 2023-02-28 01:14:56 +00:00
pretty Update tests. 2023-01-29 20:19:26 +01:00
run-make errors: fix translation's run-make test 2023-02-22 09:15:54 +00:00
run-make-fulldeps various: translation resources from cg backend 2023-02-22 09:15:54 +00:00
run-pass-valgrind
rustdoc rustdoc: avoid including <li> tags in item table short desc 2023-02-23 13:53:27 -07:00
rustdoc-gui No need for the wait-for anymore to go around browser navigation bug 2023-02-23 22:04:38 +01:00
rustdoc-js rustdoc: update test cases to match with stricter match criteria 2023-01-21 00:11:39 -07:00
rustdoc-js-std rustdoc: hide reference methods in search index 2023-02-16 17:21:57 -07:00
rustdoc-json Add regression test for #107677 2023-02-18 18:28:17 +01:00
rustdoc-ui Auto merge of #108473 - matthiaskrgr:rollup-qjyae58, r=matthiaskrgr 2023-02-26 02:04:23 +00:00
ui Auto merge of #99767 - LeSeulArtichaut:stable-target-feature-11, r=estebank 2023-02-28 01:14:56 +00:00
ui-fulldeps Auto merge of #108233 - ChrisDenton:move-std-tests, r=thomcc 2023-02-25 10:26:57 +00:00
COMPILER_TESTS.md