Use `partial_cmp` to implement tuple `lt`/`le`/`ge`/`gt`
In today's implementation, `(A, B)::gt` contains calls to *both* `A::eq` *and* `A::gt`.
That's fine for primitives, but for things like `String`s it's kinda weird -- `(String, usize)::gt` has a call to both `bcmp` and `memcmp` (<https://rust.godbolt.org/z/7jbbPMesf>) because when `bcmp` says the `String`s aren't equal, it turns around and calls `memcmp` to find out which one's bigger.
This PR changes the implementation to instead implement `(A, …, C, Z)::gt` using `A::partial_cmp`, `…::partial_cmp`, `C::partial_cmp`, and `Z::gt`. (And analogously for `lt`, `le`, and `ge`.) That way expensive comparisons don't need to be repeated.
Technically this is an observable change on stable, so I've marked it `needs-fcp` + `T-libs-api` and will
r? rust-lang/libs-api
I'm hoping that this will be non-controversial, however, since it's very similar to the observable changes that were made to the derives (#81384#98655) -- like those, this only changes behaviour if a type overrode behaviour in a way inconsistent with the rules for the various traits involved.
(The first commit here is #108156, adding the codegen test, which I used to make sure this doesn't regress behaviour for primitives.)
Zulip conversation about this change: <https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/.60.3E.60.20on.20Tuples/near/328392927>.
x fmt: Only check modified files locally
Previously, `x fmt` would only format modified files, while `x fmt .` and `x fmt --check` would still look at all files. After this change, `x fmt --check` only looks at modified files locally.
I feel pretty confident in this change - other than https://github.com/rust-lang/rust/issues/106261, no one has reported bugs in `get_modified_rs_files` since it was added in https://github.com/rust-lang/rust/pull/105702.
Combined with the changes in https://github.com/rust-lang/rust/pull/108772, this brings the time for me to run `x t tidy` with a hot FS cache down from 5 to 2 seconds (and moves the majority of the time spent back to `tidy check`, which means it can be sped up more in the future).
Desugaring DropAndReplace at MIR build (#107844) fixed issue
70919. Add regressions tests, borrowed from #102078, to ensure we
check for this in the future.
Co-authored-by: Aaron Hill <aa1ronham@gmail.com>
We don't support old versions of LLVM; there's no reason to have an easy
way to force bootstrap to use them anyway. If someone really needs to
use an unsupported version, they can modify bootstrap to change the
version range.
Previously, `x fmt` would only format modified files, while `x fmt .`
and `x fmt --check` would still look at all files. After this change, `x
fmt --check` only looks at modified files locally.
I feel pretty confident in this change - other than
https://github.com/rust-lang/rust/issues/106261, no one has reported
bugs in `get_modified_rs_files` since it was added in
https://github.com/rust-lang/rust/pull/105702.
Rollup of 7 pull requests
Successful merges:
- #106440 (Ignore files in .gitignore in tidy)
- #108613 (Remove `llvm.skip-rebuild` option)
- #108616 (Sync codegen defaults with compiler defaults and add a ping message so they stay in sync)
- #108618 (Rename `src/etc/vscode_settings.json` to `rust_analyzer_settings.json`)
- #108626 (rustdoc-json: switch from HashMap to FxHashMap to fix non-determinism)
- #108744 (Don't ICE when encountering bound var in builtin copy/clone bounds)
- #108749 (Clean up rustdoc-js tester.js file)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
rustdoc-json: switch from HashMap to FxHashMap to fix non-determinism
Using `HashMap` in `rustdoc_json_types::Crate` were causing creating randomly ordered objects in the json doc files. Which might cause problems to people who are doing comparison on those files specially in CI pipelines. See https://github.com/rust-lang/rust/issues/103785#issuecomment-1307425590
This PR fixes that issue and extends the coverage of `tests/run-make/rustdoc-verify-output-files` testing ability.
Remove `llvm.skip-rebuild` option
This was added to in 2019 to speed up rebuild times when LLVM was modified. Now that download-ci-llvm exists, I don't think it makes sense to support an unsound option like this that can lead to miscompiles; and the code cleanup is nice too.
r? `@Mark-Simulacrum` cc `@varkor` #65612
Ignore files in .gitignore in tidy
- Switch from `walkdir` to `ignore`. This required various changes to make `skip` thread-safe.
- Ignore `build` anywhere in the source tree, not just at the top-level. We support this in bootstrap, we should support it in tidy too.
As a nice side benefit, this also makes tidy a bit faster.
Before:
```
; hyperfine -i '"/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"'
Benchmark 1: "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"
Time (mean ± σ): 1.080 s ± 0.008 s [User: 2.616 s, System: 3.243 s]
Range (min … max): 1.069 s … 1.099 s 10 runs
```
After:
```
; hyperfine '"/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"'
Benchmark 1: "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"
Time (mean ± σ): 705.0 ms ± 1.4 ms [User: 3179.1 ms, System: 1517.5 ms]
Range (min … max): 702.3 ms … 706.9 ms 10 runs
```
r? `@the8472`
`WalkBuilder` handles top-level paths differently than `fn walk` used
to: it doesn't run the `skip` function to determine if it should be
skipped, instead assuming the top-level function is always included.
This is a reasonable assumption; adapt our code so it doesn't make
pointless calls to `walk`.
- Switch from `walkdir` to `ignore`. This required various changes to
make `skip` thread-safe.
- Ignore `build` anywhere in the source tree, not just at the top-level.
We support this in bootstrap, we should support it in tidy too.
As a nice side benefit, this also makes tidy a bit faster.
Before:
```
; hyperfine -i '"/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"'
Benchmark 1: "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"
Time (mean ± σ): 1.080 s ± 0.008 s [User: 2.616 s, System: 3.243 s]
Range (min … max): 1.069 s … 1.099 s 10 runs
```
After:
```
; hyperfine '"/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"'
Benchmark 1: "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0-tools-bin/rust-tidy" "/home/gh-jyn514/rust2" "/home/gh-jyn514/rust2/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "/home/gh-jyn514/rust2/build" "32"
Time (mean ± σ): 705.0 ms ± 1.4 ms [User: 3179.1 ms, System: 1517.5 ms]
Range (min … max): 702.3 ms … 706.9 ms 10 runs
```
rustc_middle: Remove trait `DefIdTree`
This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
rustc_middle: Remove trait `DefIdTree`
This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
Bless tests and show an introduced unsoundness related to
exits<'a> { forall<'b> { 'a == 'b } }.
We now resolve the var ?a in U0 to the placeholder !b in U1.
