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Pull requests: rust-lang/rust

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[experimental, do not merge!] a faster implementation of Polonius and a more compact DenseBitSet implementation A-compiletest Area: The compiletest test runner A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141583 opened May 26, 2025 by tage64 • Draft updated Jul 9, 2025
[Experiment] Build the standard library with -Csymbol-mangling-version=v0 perf-regression Performance regression. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
#142257 opened Jun 9, 2025 by wesleywiser Loading... updated Jul 9, 2025
[DO NOT MERGE] build Enzyme as archive A-testsuite Area: The testsuite used to check the correctness of rustc F-autodiff `#![feature(autodiff)]` perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue.
#140799 opened May 8, 2025 by ZuseZ4 Loading... updated Jul 9, 2025
[experimental, do not merge!] a faster implementation of Polonius A-compiletest Area: The compiletest test runner A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141326 opened May 21, 2025 by tage64 • Draft updated Jul 9, 2025
Use multiple returns in MIR if it saves a block; still have only one in LLVM perf-regression Performance regression. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138144 opened Mar 7, 2025 by scottmcm • Draft updated Jul 9, 2025
[experiment] dont init anything except x86 perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136861 opened Feb 11, 2025 by klensy Loading... updated Jul 9, 2025
Lazy-chunk Symbol interner perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136401 opened Feb 1, 2025 by Mark-Simulacrum • Draft updated Jul 9, 2025
Include arguments to the precondition check in failure messages perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#134938 opened Dec 30, 2024 by saethlin • Draft updated Jul 9, 2025
avoid phi node for pointers flowing into Vec appends perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#130998 opened Sep 28, 2024 by the8472 • Draft updated Jul 9, 2025
Swap Lru from std::sync::Arc to triomphe::Arc A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131629 opened Oct 12, 2024 by GnomedDev • Draft updated Jul 9, 2025
Support symbolicating zstd-compressed ELF sections A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-libs Relevant to the library team, which will review and decide on the PR/issue.
#130417 opened Sep 15, 2024 by workingjubilee • Draft updated Jul 9, 2025
[WIP] Elaborate drops to calls perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130691 opened Sep 22, 2024 by scottmcm • Draft updated Jul 9, 2025
Optimize core::str::Lines::count perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#123606 opened Apr 7, 2024 by thomcc • Draft updated Jul 9, 2025
2 of 3 tasks
Add inline(usually) A-attributes Area: Attributes (`#[...]`, `#![...]`) perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#130679 opened Sep 21, 2024 by saethlin • Draft updated Jul 9, 2025
Infer nounwind and use it in MIR opts perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130909 opened Sep 26, 2024 by saethlin • Draft updated Jul 9, 2025
Expand assumes to the other unchecked slice ops perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#120762 opened Feb 8, 2024 by saethlin • Draft updated Jul 9, 2025
MIR: Stop needing an explicit BB for otherwise:unreachable perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#124188 opened Apr 20, 2024 by scottmcm • Draft updated Jul 9, 2025
Check for occupied niches perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#121174 opened Feb 16, 2024 by saethlin • Draft updated Jul 9, 2025
[perf only] Reimplement references debuginfo as projection. A-mir-opt Area: MIR optimizations perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119471 opened Dec 31, 2023 by cjgillot • Draft updated Jul 9, 2025
Enable MultipleReturnTerminators by default. A-mir-opt Area: MIR optimizations perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#120179 opened Jan 21, 2024 by cjgillot • Draft updated Jul 9, 2025
Split marking and visit to compute live_symbols. perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#114538 opened Aug 6, 2023 by cjgillot • Draft updated Jul 9, 2025
Implement RFC 3349, mixed utf8 literals A-testsuite Area: The testsuite used to check the correctness of rustc perf-regression Performance regression. perf-regression-triaged The performance regression has been triaged. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-lang Relevant to the language team
#120286 opened Jan 23, 2024 by nnethercote • Draft updated Jul 9, 2025
[WIP] rustdoc (base+json): add support for variances A-rustdoc-json Area: Rustdoc JSON backend perf-regression Performance regression. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#123219 opened Mar 30, 2024 by fmease • Draft updated Jul 9, 2025
Fixup if T::CONST in MIR perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#123259 opened Mar 31, 2024 by scottmcm • Draft updated Jul 9, 2025
[WIP] rewrite TrustedRandomAccess into two directional variants perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#120682 opened Feb 5, 2024 by the8472 • Draft updated Jul 9, 2025
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