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| author | bors <bors@rust-lang.org> | 2021-10-15 12:51:31 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2021-10-15 12:51:31 +0000 |
| commit | af9b508e1d6c83a8f0e6f5c0b2b75598aa37ed27 (patch) | |
| tree | 2c4a3a50fe67e2710c33a76ad6fa7ae409d664a1 /library/std/src/sys/unix/process/zircon.rs | |
| parent | 1dafe6d1c328d2f0580763e8438a227e490deb10 (diff) | |
| parent | cd773c358793beaae4688b4bbb60d793509f7cc0 (diff) | |
| download | rust-af9b508e1d6c83a8f0e6f5c0b2b75598aa37ed27.tar.gz rust-af9b508e1d6c83a8f0e6f5c0b2b75598aa37ed27.zip | |
Auto merge of #88717 - tabokie:vecdeque-fast-append, r=m-ou-se
Optimize VecDeque::append Optimize `VecDeque::append` to do unsafe copy rather than iterating through each element. On my `Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz`, the benchmark shows 37% improvements: ``` Master: custom-bench vec_deque_append 583164 ns/iter custom-bench vec_deque_append 550040 ns/iter Patched: custom-bench vec_deque_append 349204 ns/iter custom-bench vec_deque_append 368164 ns/iter ``` Additional notes on the context: this is the third attempt to implement a non-trivial version of `VecDeque::append`, the last two are reverted due to unsoundness or regression, see: - https://github.com/rust-lang/rust/pull/52553, reverted in https://github.com/rust-lang/rust/pull/53571 - https://github.com/rust-lang/rust/pull/53564, reverted in https://github.com/rust-lang/rust/pull/54851 Both cases are covered by existing tests. Signed-off-by: tabokie <xy.tao@outlook.com>
Diffstat (limited to 'library/std/src/sys/unix/process/zircon.rs')
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