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| author | bors <bors@rust-lang.org> | 2021-08-23 22:55:19 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2021-08-23 22:55:19 +0000 |
| commit | de42550d0ac525f44ec79300a1cb349ade181c1a (patch) | |
| tree | c72423991b9b5acba50cda1e82e8f88fa6d141d4 /library/std/src/os/unix/process.rs | |
| parent | a49e38e672c60da788360e088f00ad12353e3913 (diff) | |
| parent | b1e07b82dcef6d31556a92cb75d825bce6032519 (diff) | |
| download | rust-de42550d0ac525f44ec79300a1cb349ade181c1a.tar.gz rust-de42550d0ac525f44ec79300a1cb349ade181c1a.zip | |
Auto merge of #83302 - camsteffen:write-piece-unchecked, r=dtolnay
Get piece unchecked in `write` We already use specialized `zip`, but it seems like we can do a little better by not checking `pieces` length at all. `Arguments` constructors are now unsafe. So the `format_args!` expansion now includes an `unsafe` block. <details> <summary>Local Bench Diff</summary> ```text name before ns/iter after ns/iter diff ns/iter diff % speedup fmt::write_str_macro1 22,967 19,718 -3,249 -14.15% x 1.16 fmt::write_str_macro2 35,527 32,654 -2,873 -8.09% x 1.09 fmt::write_str_macro_debug 571,953 575,973 4,020 0.70% x 0.99 fmt::write_str_ref 9,579 9,459 -120 -1.25% x 1.01 fmt::write_str_value 9,573 9,572 -1 -0.01% x 1.00 fmt::write_u128_max 176 173 -3 -1.70% x 1.02 fmt::write_u128_min 138 134 -4 -2.90% x 1.03 fmt::write_u64_max 139 136 -3 -2.16% x 1.02 fmt::write_u64_min 129 135 6 4.65% x 0.96 fmt::write_vec_macro1 24,401 22,273 -2,128 -8.72% x 1.10 fmt::write_vec_macro2 37,096 35,602 -1,494 -4.03% x 1.04 fmt::write_vec_macro_debug 588,291 589,575 1,284 0.22% x 1.00 fmt::write_vec_ref 9,568 9,732 164 1.71% x 0.98 fmt::write_vec_value 9,516 9,625 109 1.15% x 0.99 ``` </details>
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