Nicholas Nethercote 679c5ee244 Optimize Vec::insert for the case where index == len. ...

By skipping the call to `copy` with a zero length. This makes it closer
to `push`.

I did this recently for `SmallVec`
(https://github.com/servo/rust-smallvec/pull/282) and it was a big perf win in
one case. Although I don't have a specific use case in mind, it seems
worth doing it for `Vec` as well.

Things to note:
- In the `index < len` case, the number of conditions checked is
  unchanged.
- In the `index == len` case, the number of conditions checked increases
  by one, but the more expensive zero-length copy is avoided.
- In the `index > len` case the code now reserves space for the extra
  element before panicking. This seems like an unimportant change.

2022-07-01 06:46:30 +10:00

..

alloc

Use Box::new() instead of box syntax in alloc tests

2022-05-29 00:41:14 +02:00

boxed

alloc: fix no_global_oom_handling warnings

2022-06-29 04:44:23 +02:00

collections

Rollup merge of #98039 - tnballo:master, r=thomcc

2022-06-24 16:43:44 +09:00

ffi

Finish bumping stage0

2022-05-27 07:36:17 -04:00

raw_vec

Add a unit test for zero-sized types in RawVec.

2021-11-26 19:30:45 +11:00

rc

Use Box::new() instead of box syntax in alloc tests

2022-05-29 00:41:14 +02:00

sync

Use Box::new() instead of box syntax in alloc tests

2022-05-29 00:41:14 +02:00

vec

Optimize Vec::insert for the case where index == len.

2022-07-01 06:46:30 +10:00

alloc.rs

Auto merge of #97033 - nbdd0121:unwind3, r=Amanieu

2022-05-19 04:04:40 +00:00

borrow.rs

Stabilize toowned_clone_into

2022-05-28 01:07:45 +09:00

boxed.rs

Rollup merge of #97655 - steffahn:better-pin-box-construction-docs, r=thomcc

2022-06-02 23:39:07 +02:00

fmt.rs

remove useless cold

2022-05-29 20:40:56 +01:00

lib.rs

Expose iter::ByRefSized as unstable feature and use it

2022-06-18 00:03:54 +02:00

macros.rs

Use #[rustc_box] in alloc instead of box syntax

2022-06-01 02:28:34 +02:00

raw_vec.rs

alloc: fix no_global_oom_handling warnings

2022-06-29 04:44:23 +02:00

rc.rs

Rollup merge of #96609 - ibraheemdev:arc-downcast-unchecked, r=m-ou-se

2022-06-20 14:56:35 +02:00

slice.rs

Add reexport of slice::from{,_mut}_ptr_range to alloc & std

2022-05-30 15:44:56 +04:00

str.rs

additional docs example for replace **all** of str

2022-06-10 00:28:46 +08:00

string.rs

alloc: fix no_global_oom_handling warnings

2022-06-29 04:44:23 +02:00

sync.rs

clarify Arc::clone overflow check comment

2022-06-21 21:14:03 -07:00

task.rs

Document From implementations for Waker and RawWaker

2021-04-22 14:16:33 -07:00

tests.rs

Use implicit capture syntax in format_args

2022-03-10 10:23:40 -05:00