Faster fmt::Display of 128-bit integers, without unsafe pointer
In followup of #135265, hereby the 128-bit part.
* Batches per 16 instead of 19 digits
* Buffer access as array insteaf of unsafe pointer
* Added test coverage for i128 and u128
r? tgross35 ChrisDenton
feat: Add `bit_width` for unsigned integer types
- Accepted ACP: rust-lang/libs-team#598
- Tracking issue: rust-lang/rust#142326
This PR adds methods to the primitive unsigned integer types that return the minimum number of bits required to represent an unsigned integer.
Implement `//@ needs-target-std` compiletest directive
Closesrust-lang/rust#141863.
Needed to unblock rust-lang/rust#139244 and rust-lang/rust#141856.
### Summary
This PR implements a `//@ needs-target-std` compiletest directive that gates test execution based on whether the target supports std or not. For some cases, this should be preferred over e.g. some combination of `//@ ignore-none`, `//@ ignore-nvptx` and more[^none-limit].
### Implementation limitation
Unfortunately, since there is currently [no reliable way to determine from metadata whether a given target supports std or not](https://github.com/rust-lang/rust/issues/142296), we have to resort to a hack. Bootstrap currently determines whether or not a target supports std by a naive target tuple substring comparison: a target supports std if its target tuple does *not* contain one of `["-none", "nvptx", "switch"]` substrings. This PR simply pulls that hack out into `build_helpers` to avoid reimplementing the same hack in compiletest, and uses that logic to inform `//@ needs-target-std`.
### Auxiliary changes
This PR additionally changes a few run-make tests to use `//@ needs-target-std` over an inconsistent combination of target-based `ignore`s. This should help with rust-lang/rust#139244.
---
r? bootstrap
[^none-limit]: Notably, `target_os = "none"` is **not** a sufficient condition for "target does not support std"
Make root vars more stable
Never resolve a ty/ct vid to a higher vid as its root. This should make the optimization in rust-lang/rust#141500 more "stable" when there are a lot of vars flying around.
r? `@ghost`
Rewriting git history is something that is often difficult for new contributors,
and we're already explaining the `<foo>` placeholder syntax,
so I think it makes sense to be explicit about what exactly the paths mean.
mir-opt: Do not create storage marks in EarlyOtherwiseBranch
Fixes#141212.
The first commit add `StorageDead` by creating new indirect BB that makes CFG more complicated, but I think it's better to just not create storage marks.
r? mir-opt
Update cargo
18 commits in 64a12460708cf146e16cc61f28aba5dc2463bbb4..fc1518ef02b77327d70d4026b95ea719dd9b8c51
2025-05-30 18:25:08 +0000 to 2025-06-06 04:49:44 +0000
- fix: Make UI tests handle hyperlinks consistently (rust-lang/cargo#15640)
- Update "time out" to "timeout" (rust-lang/cargo#15637)
- fix(workspace): reload current manifest path member only (rust-lang/cargo#15633)
- Update dependencies (rust-lang/cargo#15635)
- fix(publish): Don't tell people to ctrl-c without knowing consequences (rust-lang/cargo#15632)
- refactor: clean up `clippy::perf` lint warnings (rust-lang/cargo#15631)
- fix(package): Skip registry check if its not needed (rust-lang/cargo#15629)
- Add --offline for comp (rust-lang/cargo#15623)
- cargo-credential-libsecret: load libsecret only once (rust-lang/cargo#15295)
- test(publish): Improvements in prep for `-Zpackage-workspace` stabilization (rust-lang/cargo#15628)
- fix(package): Allow packaging of self-cycles with -Zpackage-workspace (rust-lang/cargo#15626)
- docs: clarify `--all-features` not available for all commmands (rust-lang/cargo#15572)
- Remove double reference in Shell::print_json (rust-lang/cargo#15460)
- fix(trim-paths): remap all paths to `build.build-dir` (rust-lang/cargo#15614)
- test(trim-paths): enable more tests for windows-msvc (rust-lang/cargo#15621)
- fix(fingerprint): explicit reason rather than "stale; unknown reason" (rust-lang/cargo#15617)
- Fix cargo add overwriting symlinked Cargo.toml files (rust-lang/cargo#15281)
- chore(deps): update alpine docker tag to v3.22 (rust-lang/cargo#15616)
r? ghost
Enable Non-determinism of float operations in Miri and change std tests
Links to [#4208](https://github.com/rust-lang/miri/issues/4208) and [#3555](https://github.com/rust-lang/miri/issues/3555) in Miri.
Non-determinism of floating point operations was disabled in rust-lang/rust#137594 because it breaks the tests and doc-tests in core/coretests and std. This PR enables some of them.
This pr includes the following changes:
- Enables the float non-determinism but with a lower relative error of 4ULP instead of 16ULP
- These operations now have a fixed output based on the C23 standard, except the pow operations, this is tracked in [#4286](https://github.com/rust-lang/miri/issues/4286#issue-3010677983)
- Changes tests that made incorrect assumptions about the operations, not to make that assumption anymore (from `assert_eq!` to `assert_approx_eq!`.
- Changed the doctests of the stdlib of these operations to compare against fixed constants instead of `f*::EPSILON`, which now succeed with Miri and `-Zmiri-many-seeds`
- Added a constant `APPROX_DELTA` in `std/tests/floats/f32.rs` which is used for approximation tests, but with a different value when run in Miri. This is to make these tests succeed.
- Added tests in the float tests of Miri to test the C23 behaviour.
Fixes https://github.com/rust-lang/miri/issues/4208
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