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authorbors <bors@rust-lang.org>2025-05-15 20:20:30 +0000
committerbors <bors@rust-lang.org>2025-05-15 20:20:30 +0000
commitd97326eabfc3b2c33abcb08d6bc117aefa697cb7 (patch)
tree76f04380bbd31072d5d2acb8112abf28c9e0ecab /compiler/rustc_trait_selection/src
parentc4e05e53d19b550a358ee8b2e29ecd5a11075800 (diff)
parent1ef7585c9ef976211b897e22fad6ae9aa2c2f415 (diff)
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Auto merge of #136264 - GuillaumeGomez:optimize-integers-to-string, r=Amanieu
Optimize `ToString` implementation for integers

Part of https://github.com/rust-lang/rust/issues/135543.

Follow-up of https://github.com/rust-lang/rust/pull/133247 and https://github.com/rust-lang/rust/pull/128204.

The benchmark results are:

| name| 1.87.0-nightly (3ea711f17 2025-03-09) | With this PR | diff |
|-|-|-|-|
| bench_i16 | 32.06 ns/iter (+/- 0.12) | 17.62 ns/iter (+/- 0.03) | -45% |
| bench_i32 | 31.61 ns/iter (+/- 0.04) | 15.10 ns/iter (+/- 0.06) | -52% |
| bench_i64 | 31.71 ns/iter (+/- 0.07) | 15.02 ns/iter (+/- 0.20) | -52% |
| bench_i8 | 13.21 ns/iter (+/- 0.14) | 14.93 ns/iter (+/- 0.16) | +13% |
| bench_u16 | 31.20 ns/iter (+/- 0.06) | 16.14 ns/iter (+/- 0.11) | -48% |
| bench_u32 | 33.27 ns/iter (+/- 0.05) | 16.18 ns/iter (+/- 0.10) | -51% |
| bench_u64 | 31.44 ns/iter (+/- 0.06) | 16.62 ns/iter (+/- 0.21) | -47% |
| bench_u8 | 10.57 ns/iter (+/- 0.30) | 13.00 ns/iter (+/- 0.43) | +22% |

More information about it in [the original comment](https://github.com/rust-lang/rust/pull/136264#discussion_r1987542954).

r? `@workingjubilee`
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