Rollup of 7 pull requests #129750
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Rollup of 7 pull requests #129750
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Allows disabling `fmt::Debug` derive and debug formatting.
* Choose test inputs more thoroughly and systematically. * Check that `isqrt` and `checked_isqrt` have equivalent results for signed types, either equivalent numerically or equivalent as a panic and a `None`. * Check that `isqrt` has numerically-equivalent results for unsigned types and their `NonZero` counterparts. * Reuse `ilog10` benchmarks, plus benchmarks that use a uniform distribution.
* Use a lookup table for 8-bit integers and the Karatsuba square root algorithm for larger integers. * Include optimization hints that give the compiler the exact numeric range of results.
I am surprised the diff is so small for this enormous crate.
…Urgau
debug-fmt-detail option
I'd like to propose a new option that makes `#[derive(Debug)]` generate no-op implementations that don't print anything, and makes `{:?}` in format strings a no-op.
There are a couple of motivations for this:
1. A more thorough stripping of debug symbols. Binaries stripped of debug symbols still retain some of them through `Debug` implementations. It's hard to avoid that without compiler's help, because debug formatting can be used in many places, including dependencies, and their loggers, asserts, panics, etc.
* In my testing it gives about 2% binary size reduction on top of all other binary-minimizing best practices (including `panic_immediate_abort`). There are targets like Web WASM or embedded where users pay attention to binary sizes.
* Users distributing closed-source binaries may not want to "leak" any symbol names as a matter of principle.
2. Adds ability to test whether code depends on specifics of the `Debug` format implementation in unwise ways (e.g. trying to get data unavailable via public interface, or using it as a serialization format). Because current Rust's debug implementation doesn't change, there's a risk of it becoming a fragile de-facto API that [won't be possible to change in the future](https://www.hyrumslaw.com/). An option that "breaks" it can act as a [grease](https://www.rfc-editor.org/rfc/rfc8701.html).
This implementation is a `-Z fmt-debug=opt` flag that takes:
* `full` — the default, current state.
* `none` — makes derived `Debug` and `{:?}` no-ops. Explicit `impl Debug for T` implementations are left unharmed, but `{:?}` format won't use them, so they may get dead-code eliminated if they aren't invoked directly.
* `shallow` — makes derived `Debug` print only the type's name, without recursing into fields. Fieldless enums print their variant names. `{:?}` works.
The `shallow` option is a compromise between minimizing the `Debug` code, and compatibility. There are popular proc-macro crates that use `Debug::fmt` as a way to convert enum values into their Rust source code.
There's a corresponding `cfg` flag: `#[cfg(fmt_debug = "none")]` that can be used in user code to react to this setting to minimize custom `Debug` implementations or remove unnecessary formatting helper functions.
Improved `checked_isqrt` and `isqrt` methods ### Improved tests of `isqrt` and `checked_isqrt` implementations * Inputs chosen more thoroughly and systematically. * Checks that `isqrt` and `checked_isqrt` have equivalent results for signed types, either equivalent numerically or equivalent as a panic and a `None`. * Checks that `isqrt` has numerically-equivalent results for unsigned types and their `NonZero` counterparts. ### Added benchmarks for `isqrt` implementations ### Greatly sped up `checked_isqrt` and `isqrt` methods * Uses a lookup table for 8-bit integers and then the Karatsuba square root algorithm for larger integers. * Includes optimization hints that give the compiler the exact numeric range of results. ### Feature tracking issue `isqrt` is an unstable feature tracked at rust-lang#116226. <details><summary>Benchmarked improvements</summary> ### Command used to benchmark ./x bench library/core -- int_sqrt ### Before benchmarks: num::int_sqrt::i128::isqrt 439591.65/iter +/- 6652.70 num::int_sqrt::i16::isqrt 5302.97/iter +/- 160.93 num::int_sqrt::i32::isqrt 62999.11/iter +/- 2022.05 num::int_sqrt::i64::isqrt 125248.81/iter +/- 1674.43 num::int_sqrt::i8::isqrt 123.56/iter +/- 1.87 num::int_sqrt::isize::isqrt 125356.56/iter +/- 1017.03 num::int_sqrt::non_zero_u128::isqrt 437443.75/iter +/- 3535.43 num::int_sqrt::non_zero_u16::isqrt 8604.58/iter +/- 94.76 num::int_sqrt::non_zero_u32::isqrt 62933.33/iter +/- 517.30 num::int_sqrt::non_zero_u64::isqrt 125076.38/iter +/- 11340.61 num::int_sqrt::non_zero_u8::isqrt 221.51/iter +/- 1.58 num::int_sqrt::non_zero_usize::isqrt 136005.21/iter +/- 2020.35 num::int_sqrt::u128::isqrt 439014.55/iter +/- 3920.45 num::int_sqrt::u16::isqrt 8575.08/iter +/- 148.06 num::int_sqrt::u32::isqrt 63008.89/iter +/- 803.67 num::int_sqrt::u64::isqrt 125088.09/iter +/- 879.29 num::int_sqrt::u8::isqrt 230.18/iter +/- 2.04 num::int_sqrt::usize::isqrt 125237.51/iter +/- 4747.83 ### After benchmarks: num::int_sqrt::i128::isqrt 105184.89/iter +/- 1171.38 num::int_sqrt::i16::isqrt 1910.26/iter +/- 78.50 num::int_sqrt::i32::isqrt 34260.34/iter +/- 960.84 num::int_sqrt::i64::isqrt 45939.19/iter +/- 2525.65 num::int_sqrt::i8::isqrt 22.87/iter +/- 0.45 num::int_sqrt::isize::isqrt 45884.17/iter +/- 595.49 num::int_sqrt::non_zero_u128::isqrt 106344.27/iter +/- 780.99 num::int_sqrt::non_zero_u16::isqrt 2790.19/iter +/- 53.43 num::int_sqrt::non_zero_u32::isqrt 33613.99/iter +/- 362.96 num::int_sqrt::non_zero_u64::isqrt 46235.42/iter +/- 429.69 num::int_sqrt::non_zero_u8::isqrt 31.78/iter +/- 0.75 num::int_sqrt::non_zero_usize::isqrt 46208.75/iter +/- 375.27 num::int_sqrt::u128::isqrt 106385.94/iter +/- 1649.95 num::int_sqrt::u16::isqrt 2747.69/iter +/- 28.72 num::int_sqrt::u32::isqrt 33627.09/iter +/- 475.68 num::int_sqrt::u64::isqrt 46182.29/iter +/- 311.16 num::int_sqrt::u8::isqrt 33.10/iter +/- 0.30 num::int_sqrt::usize::isqrt 46165.00/iter +/- 388.41 </details> Tracking Issue for {u8,i8,...}::isqrt rust-lang#116226 try-job: test-various
Add `-Zlint-llvm-ir` This flag is similar to `-Zverify-llvm-ir` and allows us to lint the generated IR. r? compiler
… r=nnethercote riscv64imac: allow shadow call stack sanitizer cc `@Darksonn` for shadow call stack sanitizer support on RV64IMAC and RV64GC
…ouxu Add `needs-unwind` compiletest directive to `libtest-thread-limit` and replace some `Path` with `path` in `run-make` Part of rust-lang#121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html). This PR does two things: 1. Add this to `libtest-thread-limit` ([Why?](rust-lang#128507 (comment))) ``` //@ needs-unwind // Reason: this should be ignored in cg_clif (Cranelift) CI and anywhere // else that uses panic=abort. ``` 2. Use `path` instead of `Path` to simplify multiple run-make tests.
…rgau Add `unreachable_pub`, round 3 A follow-up to rust-lang#129648. r? `@Urgau`
… r=notriddle Fix rustdoc clippy lints Ran clippy on rustdoc and fixed the errors. r? `@notriddle`
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@bors r+ p=7 rollup=never |
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…llaumeGomez Rollup of 7 pull requests Successful merges: - rust-lang#123940 (debug-fmt-detail option) - rust-lang#128166 (Improved `checked_isqrt` and `isqrt` methods) - rust-lang#128970 (Add `-Zlint-llvm-ir`) - rust-lang#129316 (riscv64imac: allow shadow call stack sanitizer) - rust-lang#129690 (Add `needs-unwind` compiletest directive to `libtest-thread-limit` and replace some `Path` with `path` in `run-make`) - rust-lang#129732 (Add `unreachable_pub`, round 3) - rust-lang#129743 (Fix rustdoc clippy lints) r? `@ghost` `@rustbot` modify labels: rollup
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The job Click to see the possible cause of the failure (guessed by this bot) |
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💔 Test failed - checks-actions |
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@bors retry |
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☀️ Test successful - checks-actions |
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📌 Perf builds for each rolled up PR:
previous master: 784d444733 In the case of a perf regression, run the following command for each PR you suspect might be the cause: |
This was referenced Aug 29, 2024
Merged
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Finished benchmarking commit (0d63418): comparison URL. Overall result: ❌ regressions - no action needed@rustbot label: -perf-regression Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)This benchmark run did not return any relevant results for this metric. CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: missing data |
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Successful merges:
checked_isqrtandisqrtmethods #128166 (Improvedchecked_isqrtandisqrtmethods)-Zlint-llvm-ir#128970 (Add-Zlint-llvm-ir)needs-unwindcompiletest directive tolibtest-thread-limitand replace somePathwithpathinrun-make#129690 (Addneeds-unwindcompiletest directive tolibtest-thread-limitand replace somePathwithpathinrun-make)unreachable_pub, round 3 #129732 (Addunreachable_pub, round 3)r? @ghost
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