rust/library at 335ffbfa547df94ac236f5c56130cecf99c8d82b - rust

History

bors 335ffbfa54 Auto merge of #94472 - JmPotato:use_maybeuninit_for_vecdeque, r=m-ou-se

Use MaybeUninit in VecDeque to remove the undefined behavior of slice

Signed-off-by: JmPotato <ghzpotato@gmail.com>

Ref https://github.com/rust-lang/rust/issues/74189. Adjust the code to follow the [doc.rust-lang.org/reference/behavior-considered-undefined.html](https://doc.rust-lang.org/reference/behavior-considered-undefined.html).

* Change the return type of `buffer_as_slice` from `&[T]` to `&[MaybeUninit<T>]`.
* Add some corresponding safety comments.

Benchmark results:

master 8d6f527530f4ba974d922269267fe89050188789

```rust
test collections::vec_deque::tests::bench_pop_back_100       ... bench:          47 ns/iter (+/- 1)
test collections::vec_deque::tests::bench_pop_front_100      ... bench:          50 ns/iter (+/- 4)
test collections::vec_deque::tests::bench_push_back_100      ... bench:          69 ns/iter (+/- 10)
test collections::vec_deque::tests::bench_push_front_100     ... bench:          72 ns/iter (+/- 6)
test collections::vec_deque::tests::bench_retain_half_10000  ... bench:     145,891 ns/iter (+/- 7,975)
test collections::vec_deque::tests::bench_retain_odd_10000   ... bench:     141,647 ns/iter (+/- 3,711)
test collections::vec_deque::tests::bench_retain_whole_10000 ... bench:     120,132 ns/iter (+/- 4,078)
```

This PR

```rust
test collections::vec_deque::tests::bench_pop_back_100       ... bench:          48 ns/iter (+/- 2)
test collections::vec_deque::tests::bench_pop_front_100      ... bench:          51 ns/iter (+/- 3)
test collections::vec_deque::tests::bench_push_back_100      ... bench:          73 ns/iter (+/- 2)
test collections::vec_deque::tests::bench_push_front_100     ... bench:          73 ns/iter (+/- 2)
test collections::vec_deque::tests::bench_retain_half_10000  ... bench:     131,796 ns/iter (+/- 5,440)
test collections::vec_deque::tests::bench_retain_odd_10000   ... bench:     137,563 ns/iter (+/- 3,349)
test collections::vec_deque::tests::bench_retain_whole_10000 ... bench:     128,815 ns/iter (+/- 3,289)
```

2022-03-11 19:23:55 +00:00

alloc

Auto merge of #94472 - JmPotato:use_maybeuninit_for_vecdeque, r=m-ou-se

2022-03-11 19:23:55 +00:00

backtrace @ b02ed04a7e

Updated backtrace submodule

2021-11-02 12:31:34 +01:00

core

Rollup merge of #94842 - tspiteri:there-is-no-try, r=Dylan-DPC

2022-03-11 13:38:39 +01:00

panic_abort

Switch all libraries to the 2021 edition