4e4f63c29f
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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