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`core_float_math`: Move functions to `math` module
When these functions were added in https://github.com/rust-lang/rust/pull/138087 It made a relatively common pattern for emulating these functions using an extension trait (which internally uses `libm`) much more fragile. If `core::f32` happened to be imported by the user (to access a constant, say), then that import in the module namespace would take precedence over the `f32` in the type namespace for resolving these functions, running headfirst into the stability attribute.
We ran into this in [Color](https://github.com/linebender/color) and chose to release the remedial 0.3.1 and 0.2.4, to allow downstream crates to build on `docs.rs`.
As these methods are perma-unstable, moving them into a new module should not have any long-term concerns, and ensures that this "breakage" doesn't adversely impact anyone else.
I believe that I've made the module unstable correctly. I presume that this does not require a test to make sure stable code can't depend on the module existing?
I've left the stability attribute on each function - happy to tweak this if a different pattern is more correct.
Tracking issue for `core_float_math`: https://github.com/rust-lang/rust/issues/137578.
This PR is as requested in https://github.com/rust-lang/rust/pull/138087.
r? `@tgross35`
Recommended reviewing with whitespace hidden.
(This is my first PR to `std/core`/this repository, as far as I can remember)
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When these functions were added in
https://github.com/rust-lang/rust/pull/138087
It made a relatively common pattern for emulating
these functions using an extension trait (which
internally uses `libm`) much more fragile.
If `core::f32` happened to be imported by the user
(to access a constant, say), then that import in
the module namespace would take precedence over
`f32` in the type namespace for resolving these
functions, running headfirst into the stability
attribute.
We ran into this in Color -
https://github.com/linebender/color - and chose to
release the remedial 0.3.1 and 0.2.4, to allow
downstream crates to build on `docs.rs`.
As these methods are perma-unstable, moving them
into a new module should not have any long-term
concerns, and ensures that this breakage doesn't
adversely impact anyone else.
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Pending fix.
```
error: cannot find a built-in macro with name `autodiff_forward`
--> library\core\src\macros\mod.rs:1542:5
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1542 | / pub macro autodiff_forward($item:item) {
1543 | | /* compiler built-in */
1544 | | }
| |_____^
error: cannot find a built-in macro with name `autodiff_reverse`
--> library\core\src\macros\mod.rs:1549:5
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1549 | / pub macro autodiff_reverse($item:item) {
1550 | | /* compiler built-in */
1551 | | }
| |_____^
error: could not compile `core` (lib) due to 2 previous errors
```
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[std] fix the presentation of `split_off_mut` and `split_off` documentation
Fixes #141107
r? libs
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Add `f16` formatting and parsing
Use the same algorithms as for `f32` and `f64` to implement `f16` parsing and printing.
try-job: x86_64-gnu-aux
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Stabilize the avx512 target features
This PR stabilizes the AVX512 target features - see [this comment](https://github.com/rust-lang/rust/issues/111137#issuecomment-2745821279).
Tracking Issue - #44839
The target feature UI tests have been changed to `x87` (chosen because this is very unlikely to stablize ever, please comment if some other feature will be better)
related: #111137
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Use the existing Lemire (decimal -> float) and Dragon / Grisu algorithms
(float -> decimal) to add support for `f16`. This allows updating the
implementation for `Display` to the expected behavior for `Display`
(currently it prints the a hex bitwise representation), matching other
floats, and adds a `FromStr` implementation.
In order to avoid crashes when compiling with Cranelift or on targets
where f16 is not well supported, a fallback is used if
`cfg(target_has_reliable_f16)` is not true.
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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Stabilize `#![feature(non_null_from_ref)]`
This PR stabilizes the following:
```rust
impl<T: ?Sized> NonNull<T> {
pub const fn from_ref(reference: &T) -> NonNull<T>;
pub const fn from_mut(reference: &mut T) -> NonNull<T>;
}
```
The feature is tracked in [#130823](https://github.com/rust-lang/rust/issues/130823).
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Initial implementation of `core_float_math`
Since [1], `compiler-builtins` makes a certain set of math symbols
weakly available on all platforms. This means we can begin exposing some
of the related functions in `core`, so begin this process here.
It is not possible to provide inherent methods in both `core` and `std`
while giving them different stability gates, so standalone functions are
added instead. This provides a way to experiment with the functionality
while unstable; once it is time to stabilize, they can be converted to
inherent.
For `f16` and `f128`, everything is unstable so we can move the inherent
methods.
The following are included to start:
* floor
* ceil
* round
* round_ties_even
* trunc
* fract
* mul_add
* div_euclid
* rem_euclid
* powi
* sqrt
* abs_sub
* cbrt
These mirror the set of functions that we have in `compiler-builtins`
since [1], with the exception of `powi` that has been there longer.
Details for each of the changes is in the commit messages.
Tracking issue: https://github.com/rust-lang/rust/issues/137578
[1]: https://github.com/rust-lang/compiler-builtins/pull/763
try-job: aarch64-gnu
tru-job: armhf-gnu
try-job: i686-msvc-1
try-job: test-various
try-job: x86_64-mingw-1
try-job: x86_64-mingw-2
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Add as_ascii_unchecked() methods to char, u8, and str
This PR adds the `as_ascii_unchecked()` method to `char`, `u8`, and `str`, allowing users to convert these types to `ascii::Char`s (see #110998) in an `unsafe` context without first checking for validity. This method was already available for `[u8]`, so this PR makes the API more consistent across other types.
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Add `#[must_use]` to Array::map
The output of Array::map is intended to be an array of the same size, and does not modify the original in place nor is it intended for side-effects. Thus, under normal circumstances it should be consumed.
See [discussion](https://internals.rust-lang.org/t/array-map-annotate-with-must-use/22813/26).
Attaching to tracking issue #75243
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When `try_fold` is overriden, it is usually easier for compilers to
optimize.
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std: explain prefer `TryInto` over `TryFrom` when specifying traits bounds on generic function
Fixes #140761
This PR keeps the explanations of `Into` and `From` consistent and adds explanations for `TryInto` and `TryFrom`.
r? libs
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This updates some doctests that fail to run on wasm. We will soon be
supporting cross-compiled doctests, and the test-various job fails to
run these tests. These tests fail because wasm32-wasip1 does not support
threads.
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Rollup of 7 pull requests
Successful merges:
- #139749 (docs(library/core/src/pin): fix typo "necessarily" -> "necessary")
- #140685 (Simplify `Vec::as_non_null` implementation and make it `const`)
- #140712 (normalization: avoid incompletely constraining GAT args)
- #140768 (Improve `dangerous_implicit_aurorefs` diagnostic output)
- #140947 (Flush errors before deep normalize in `dropck_outlives`)
- #140990 (VxWorks: updates from recent libc versions)
- #141027 (remove `RustfmtState` to reduce `initial_rustfmt` complexity)
r? `@ghost`
`@rustbot` modify labels: rollup
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ruancomelli:docs/library/core/src/pin/fix-typo-necessarily-to-necessary, r=joboet
docs(library/core/src/pin): fix typo "necessarily" -> "necessary"
Fix a typo in [`library/core/src/pin.rs`](https://github.com/ruancomelli/rust/blob/14662fabeb69fe5ab6c6e68051bf9f80d4aaaa35/library/core/src/pin.rs), from
> As we'll see later, this is **necessarily** from the time the value is first pinned until the end of its lifespan.
to
> As we'll see later, this is **necessary** from the time the value is first pinned until the end of its lifespan.
(my emphasis).
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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 |
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| 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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MaybeUninit::write: fix doc
# Fix doc for `MaybeUninit::write`
The documentation refers to the way `MaybeUninit` stores data internally. The property of not dropping content on context exit is the responsibility of `ManuallyDrop`.
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Per [1], MinGW has an incorrect fma implementation. This showed up in
tests run with cranelift after adding float math operations to `core`.
Presumably we hadn't noticed this when running tests with LLVM because
LLVM was constant folding the result away.
Rust issue: https://github.com/rust-lang/rust/issues/140515
[1]: https://sourceforge.net/p/mingw-w64/bugs/848/
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They will be used in Clippy to detect runtime parsing of known-valid
IP addresses.
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Since [1], `compiler-builtins` makes a certain set of math symbols
weakly available on all platforms. This means we can begin exposing some
of the related functions in `core`, so begin this process here.
It is not possible to provide inherent methods in both `core` and `std`
while giving them different stability gates, so standalone functions are
added instead. This provides a way to experiment with the functionality
while unstable; once it is time to stabilize, they can be converted to
inherent.
For `f16` and `f128`, everything is unstable so we can move the inherent
methods.
The following are included to start:
* floor
* ceil
* round
* round_ties_even
* trunc
* fract
* mul_add
* div_euclid
* rem_euclid
* powi
* sqrt
* abs_sub
* cbrt
These mirror the set of functions that we have in `compiler-builtins`
since [1].
Tracking issue: https://github.com/rust-lang/rust/issues/137578
[1]: https://github.com/rust-lang/compiler-builtins/pull/763
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The output of Array::map is intended to be an array of the same size, and does not modify the
original in place nor is it intended for side-effects. Thus, under normal circumstances it should be consumed.
See [discussion](https://internals.rust-lang.org/t/array-map-annotate-with-must-use/22813/26).
Attaching to tracking issue #75243
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is_ascii_whitespace
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Split duration_constructors to get non-controversial constructors out
This implements #140881
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r=scottmcm,traviscross,tgross35
Use intrinsics for `{f16,f32,f64,f128}::{minimum,maximum}` operations
This PR creates intrinsics for `{f16,f32,f64,f64}::{minimum,maximum}` operations.
This wasn't done when those operations were added as the LLVM support was too weak but now that LLVM has libcalls for unsupported platforms we can finally use them.
Cranelift and GCC[^1] support are partial, Cranelift doesn't support `f16` and `f128`, while GCC doesn't support `f16`.
r? `@tgross35`
try-job: aarch64-gnu
try-job: dist-various-1
try-job: dist-various-2
[^1]: https://www.gnu.org/software///gnulib/manual/html_node/Functions-in-_003cmath_002eh_003e.html
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remove 'unordered' atomic intrinsics
As their doc comment already indicates, these operations do not currently have a place in our memory model. The intrinsics were introduced to support a hack in compiler-builtins, but that hack recently got removed (see https://github.com/rust-lang/compiler-builtins/issues/788).
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r=Mark-Simulacrum
remove intrinsics::drop_in_place
This was only ever accidentally stable, and has been marked as deprecated since Rust 1.52, released almost 4 years ago. We've removed the old serialization `derive`s, maybe we can remove this one as well?
As suggested by ``@jhpratt,`` let's see what crater says for this one.
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Implement (part of) ACP 429: add `DerefMut` to `Lazy[Cell/Lock]`
`DerefMut` is instantly stable, as a trait impl. That means this needs an FCP.
``@rustbot`` label +needs-fcp
https://github.com/rust-lang/libs-team/issues/429
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Clarify black_box warning a bit
Trying to bring the docs on black_box more in line with the advice that we have discussed in Zulip.
https://github.com/rust-lang/rust/pull/140341#issuecomment-2832592382
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And note that the same limitation applies to all LLVM-based compilers
Co-authored-by: Ralf Jung <post@ralfj.de>
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on generic function
Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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de-stabilize bench attribute
This has been soft-unstable since forever (https://github.com/rust-lang/rust/pull/64066), and shown in future-compat reports since Rust 1.77 (https://github.com/rust-lang/rust/pull/116274).
The feature covering `bench` itself is tracked in https://github.com/rust-lang/rust/issues/50297, which has been closed despite still having active feature gates referencing it.
Cc `@rust-lang/libs-api`
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