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Pull requests: rust-lang/rust
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Disable incr CGU merging
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.
Ignore intrinsic calls in cross-crate-inlining cost model
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.
[EXPERIMENT] Introduce 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.
WG-trait-system-refactor
The Rustc Trait System Refactor Initiative (-Znext-solver)
TypingMode::Codegen
to avoid layout cycles
perf-regression
Dogfood 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)
-Zno-embed-metadata
in the compiler
A-testsuite
[TOY] Run MIR opts before coroutine state transform
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.
Cache param_env on disk.
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.
Use 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.
WG-trait-system-refactor
The Rustc Trait System Refactor Initiative (-Znext-solver)
ExtractIf
in fulfillment loop
perf-regression
#144699
opened Jul 30, 2025 by
compiler-errors
•
Draft
EXPERIMENT: Use the force-inline pass for more stuff
A-attributes
Area: Attributes (`#[...]`, `#![...]`)
A-LLVM
Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.
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.
T-libs
Relevant to the library team, which will review and decide on the PR/issue.
GVN: Use a VnIndex in Address projection.
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.
Validate transmute in CTFE
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.
#144030
opened Jul 16, 2025 by
oli-obk
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[TOY] Extend GVN to perform local value numbering.
A-mir-opt-GVN
Area: MIR opt Global Value Numbering (GVN)
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.
Detect unwind-free functions in MIR
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.
#143167
opened Jun 28, 2025 by
Mark-Simulacrum
•
Draft
Make lowering incremental, take 3/N
perf-regression
Performance regression.
PG-exploit-mitigations
Project group: Exploit mitigations
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-rustdoc
Relevant to the rustdoc team, which will review and decide on the PR/issue.
Cache MIR preorder traversal.
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.
[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
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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.
[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.
[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
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[perf] Decouple directly accessing a HIR owner from ast lowering
A-query-system
Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)
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.
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.
Ensure constants are WF before calling into CTFE
perf-regression
Performance regression.
PG-exploit-mitigations
Project group: Exploit mitigations
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.
WG-trait-system-refactor
The Rustc Trait System Refactor Initiative (-Znext-solver)
[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
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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
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.
Do partial SsaLocals analysis in unoptimized builds
A-run-make
Area: port run-make Makefiles to rmake.rs
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.
ProTip!
Follow long discussions with comments:>50.