Rollup of 16 pull requests #58668
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Rollup of 16 pull requests #58668
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Specialize Iterator::try_fold and DoubleEndedIterator::try_rfold to improve code generation in all internal iteration scenarios. This changes brings the performance of internal iteration with RangeInclusive on par with the performance of iteration with Range: - Single conditional jump in hot loop, - Unrolling and vectorization, - And even Closed Form substitution. Unfortunately, it only applies to internal iteration. Despite various attempts at stream-lining the implementation of next and next_back, LLVM has stubbornly refused to optimize external iteration appropriately, leaving me with a choice between: - The current implementation, for which Closed Form substitution is performed, but which uses 2 conditional jumps in the hot loop when optimization fail. - An implementation using a "is_done" boolean, which uses 1 conditional jump in the hot loop when optimization fail, allowing unrolling and vectorization, but for which Closed Form substitution fails. In the absence of any conclusive evidence as to which usecase matters most, and with no assurance that the lack of Closed Form substitution is not indicative of other optimizations being foiled, there is no way to pick one implementation over the other, and thus I defer to the statu quo as far as next and next_back are concerned.
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
Co-Authored-By: Aaronepower <Aaronepower@users.noreply.github.com>
… the move was partial
It is currently a method of `Token`, but it only is valid to call if `self` is a `Token::Interpolated`. This commit eliminates the possibility of misuse by changing it to an associated function that takes a `Nonterminal`, which also simplifies the call sites. This requires splitting out a new function, `nonterminal_to_string`.
It's present within `Token::Interpolated` as an optimization, so that if a nonterminal is converted to a `TokenStream` multiple times, the first-computed value is saved and reused. But in practice it's not needed. `interpolated_to_tokenstream()` is a cold function: it's only called a few dozen times while compiling rustc itself, and a few hundred times across the entire `rustc-perf` suite. Furthermore, when it is called, it is almost always the first conversion, so no benefit is gained from it. So this commit removes `LazyTokenStream`, along with the now-unnecessary `Token::interpolated()`. As well as a significant simplification, the removal speeds things up slightly, mostly due to not having to `drop` the `LazyTokenStream` instances.
The current code (expensively) clones the value within an `Rc`. This commit changes things so that the `Rc` itself is (cheaply) cloned instead, avoid some allocations. This requires converting a few `Rc` instances to `Lrc`.
These are probably leftovers from recent `TokenStream` simplifications.
AFAICT, we do not have the same const-eval issues that we used to when rust-lang#23926 was filed. (Probably because of the switch to miri for const-evaluation.)
RangeInclusive internal iteration performance improvement. Specialize `Iterator::try_fold` and `DoubleEndedIterator::try_rfold` to improve code generation in all internal iteration scenarios. This changes brings the performance of internal iteration with `RangeInclusive` on par with the performance of iteration with `Range`: - Single conditional jump in hot loop, - Unrolling and vectorization, - And even Closed Form substitution. Unfortunately, it only applies to internal iteration. Despite various attempts at stream-lining the implementation of `next` and `next_back`, LLVM has stubbornly refused to optimize external iteration appropriately, leaving me with a choice between: - The current implementation, for which Closed Form substitution is performed, but which uses 2 conditional jumps in the hot loop when optimization fail. - An implementation using a `is_done` boolean, which uses 1 conditional jump in the hot loop when optimization fail, allowing unrolling and vectorization, but for which Closed Form substitution fails. In the absence of any conclusive evidence as to which usecase matters most, and with no assurance that the lack of Closed Form substitution is not indicative of other optimizations being foiled, there is no way to pick one implementation over the other, and thus I defer to the statu quo as far as `next` and `next_back` are concerned.
…stebank Add better error message for partial move closes rust-lang#56657 r? @davidtwco
Updated RELEASES.md for 1.33.0 [Rendered](https://github.com/Aaronepower/rust/blob/master/RELEASES.md) r? @Mark-Simulacrum cc @rust-lang/release
…nts, r=arielb1 Check the Self-type of inherent associated constants r? @arielb1
SGX target: fix panic = abort What is the difference between `no_mangle` and `rustc_std_internal_symbol`?
…etrochenkov Remove `LazyTokenStream`. `LazyTokenStream` was added in rust-lang#40939. Perhaps it was an effective optimization then, but no longer. This PR removes it, making the code both simpler and faster. r? @alexcrichton
Special suggestion for illegal unicode curly quote pairs Fixes rust-lang#58436 Did not end up expanding the error message span to include the full string literal since I figured the start of the token was the issue, while the help suggestion span would include up to the closing quotation mark. The look ahead logic does not affect the reader position, not sure if that is an issue (if eg it should still continue to parse after the closing quote without erroring out).
…iated, r=oli-obk Turn duration consts into associated consts As suggested in rust-lang#57391 (comment), I'm moving `Duration` constants (`SECOND`, `MILLISECOND` and so on; currently behind unstable `duration_constants` feature) into the `impl Duration` block. cc @frewsxcv @SimonSapin
Allow Self::Module to be mutated. This only changes `&Self::Module` to `&mut Self::Module` in a couple of places. `codegen_allocator` and `write_metadata` from `ExtraBackendMethods` mutate the underlying LLVM module. As such, it makes sense for these two functions to receive a mutable reference to the module (as opposed to an immutable one). I am trying to implement `codegen_allocator` for my backend, and I need to be able to mutate `Self::Module`: https://github.com/rust-lang/rust/blob/f66e4697ae286985ddefc53c3a047614568458bb/src/librustc_codegen_ssa/traits/backend.rs#L41 Modifying the module in `codegen_allocator`/`write_metadata` is not a problem for the LLVM backend, because [ModuleLlvm](https://github.com/rust-lang/rust/blob/master/src/librustc_codegen_llvm/lib.rs#L357) contains a raw pointer to the underlying LLVM module, so it can easily be mutated through FFI calls. I am trying to avoid interior mutability and `unsafe` as much as I can. What do you think? Does this change make sense, or is there a reason why this should stay the way it is?
…-obk Optimise vec![false; N] to zero-alloc Nowadays booleans have a well-defined representation, so there is no reason not to optimise their allocation.
… r=GuillaumeGomez rustdoc: support methods on primitives in intra-doc links Fixes rust-lang#58598.
…anishearth Don't generate minification variables if minification disabled If the minification is disabled, there is no sense having those variables. r? @QuietMisdreavus
…r=nikomatsakis Update tests to account for cross-platform testing and miri. Fix rust-lang#23926
Do not underflow after resetting unmatched braces count Fix rust-lang#58638. r? @oli-obk
Add expected/provided byte alignments to validation error message Fixes rust-lang#58617
…n, r=petrochenkov Reduce Miri-related Code Repetition `like (n << amt) >> amt` This Pull Request fixes a part of [rust-lang#49937](rust-lang#49937).
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@bors r+ p=16 |
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📌 Commit 6f374ea has been approved by |
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Successful merges:
LazyTokenStream. #58476 (RemoveLazyTokenStream.)like (n << amt) >> amt#58667 (Reduce Miri-related Code Repetitionlike (n << amt) >> amt)Failed merges:
r? @ghost