Rollup of 3 pull requests #131345
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Rollup of 3 pull requests #131345
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This makes it possible for other parts of counter-assignment to check whether a node is guaranteed to end up with some kind of counter. Switching from `impl Fn` to a concrete `&BitSet` just avoids the hassle of trying to store a closure in a struct field, and currently there's no foreseeable need for this information to not be a bitset.
This change `const`-qualifies many methods on Vec and String, notably `as_slice`, `as_str`, `len`. These changes are made behind the unstable feature flag `const_vec_string_slice` with the following tracking issue: rust-lang#129041
…ss35
liballoc: introduce String, Vec const-slicing
This change `const`-qualifies many methods on `Vec` and `String`, notably `as_slice`, `as_str`, `len`. These changes are made behind the unstable feature flag `const_vec_string_slice`.
## Motivation
This is to support simultaneous variance over ownership and constness. I have an enum type that may contain either `String` or `&str`, and I want to produce a `&str` from it in a possibly-`const` context.
```rust
enum StrOrString<'s> {
Str(&'s str),
String(String),
}
impl<'s> StrOrString<'s> {
const fn as_str(&self) -> &str {
match self {
// In a const-context, I really only expect to see this variant, but I can't switch the implementation
// in some mode like #[cfg(const)] -- there has to be a single body
Self::Str(s) => s,
// so this is a problem, since it's not `const`
Self::String(s) => s.as_str(),
}
}
}
```
Currently `String` and `Vec` don't support this, but can without functional changes. Similar logic applies for `len`, `capacity`, `is_empty`.
## Changes
The essential thing enabling this change is that `Unique::as_ptr` is `const`. This lets us convert `RawVec::ptr` -> `Vec::as_ptr` -> `Vec::as_slice` -> `String::as_str`.
I had to move the `Deref` implementations into `as_{str,slice}` because `Deref` isn't `#[const_trait]`, but I would expect this change to be invisible up to inlining. I moved the `DerefMut` implementations as well for uniformity.
enable f16 and f128 on windows-gnullvm targets Continuation of rust-lang#130959
coverage: Multiple small tweaks to counter creation I've been experimenting with some larger changes to how coverage counters are assigned to parts of the control-flow graph, and while none of that is ready yet, along the way I've repeatedly found myself wanting these smaller tweaks as a base. There are no changes to compiler output.
rustbot
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@bors r+ rollup=never p=3 |
bors
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☀️ Test successful - checks-actions |
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📌 Perf builds for each rolled up PR:
previous master: 8841a3dadd In the case of a perf regression, run the following command for each PR you suspect might be the cause: |
This was referenced Oct 7, 2024
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Finished benchmarking commit (690332a): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)Results (primary 1.2%, secondary -2.3%)This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeResults (primary 0.2%, secondary 0.1%)This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Bootstrap: 775.129s -> 774.76s (-0.05%) |
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