compiler-builtins subtree update by tgross35 · Pull Request #165016 · rust-lang/rust

tgross35 · 2026-10-27T03:05:49Z

Subtree update of compiler-builtins to rust-lang/compiler-builtins@da91091.

Created using https://github.com/rust-lang/josh-sync.

Starting with LLVM version 22 `nounwind` is now propagated from inline assembly to functions containing it, meaning this workaround can now be removed. This reverts commit c4966f9b0d4323183933e98dea4d0a77f52c0e0a. Link: llvm/llvm-project#150958 Link: rust-lang#144518

Source: https://gitlab.inria.fr/core-math/core-math/-/blob/0bbf26a18f09e74675b6caca62aa4c3ff86c7bc2/src/binary16/exp2m1/exp2m1f16.c

Since [1], these symbols are now mangled so need a lang item indicator rather than `unsafe(no_mangle)`. This works on all platforms. It seems like we can build without the other `rust_eh` symbols nowadays as well. [1]: rust-lang#148413

Never build the versions included with LLVM's compiler-rt library when the 'c' feature is enabled. The rust version should be no worse than those included with compiler-rt.

This updates the rust-version file to 8592206.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Previous upstream ref: rust-lang/rust@5d89371 New upstream ref: rust-lang/rust@8592206 Filtered ref: rust-lang/compiler-builtins@68d4f4a Upstream diff: rust-lang/rust@5d89371...8592206 This merge was created using https://github.com/rust-lang/josh-sync.

Signed-off-by: hashcatHitman <155700084+hashcatHitman@users.noreply.github.com>

Currently this seems to be way more frequent, so reduce the PR noise.

tgross35 · 2026-10-27T03:05:59Z

@bors r+ rollup=never p=1

rust-bors · 2026-10-27T03:06:02Z

📌 Commit a22db91 has been tentatively approved by tgross35

It will be put into the queue for this repository once PR CI succeeds.

rust-bors · 2026-10-27T03:13:14Z

❌ Commit a22db91 has been unapproved due to PR CI failure. Reapprove it with @bors r+ force if you want to ignore the failure.

`CARGO_BUILD_WARNINGS=deny` exposed a handful of warnings about unused imports and dependencies. Fix everything before enabling in CI.

`RUSTFLAGS=-Dwarnings` is ignored by build scripts when `--target` is specified, so our builds were never getting fully validated. For now, `CARGO_BUILD_WARNINGS` is the best way to improve this.

tgross35 · 2026-10-27T06:50:26Z

@bors r+ rollup=never p=1

rust-bors · 2026-10-27T06:50:29Z

📌 Commit 25ca815 has been tentatively approved by tgross35

It will be put into the queue for this repository once PR CI succeeds.

@ghost

compiler-builtins subtree update Subtree update of `compiler-builtins` to rust-lang/compiler-builtins@da91091. Created using https://github.com/rust-lang/josh-sync. r? @ghost

rust-log-analyzer · 2026-10-27T09:54:33Z

The job test-x86_64-gnu-llvm-22-3 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

@ghost

compiler-builtins subtree update Subtree update of `compiler-builtins` to rust-lang/compiler-builtins@da91091. Created using https://github.com/rust-lang/josh-sync. r? @ghost

rust-bors · 2026-10-27T23:40:47Z

💔 Test for eb65e09 failed: CI. Failed job:

auto - test-aarch64-apple-macos-26-2 (web logs, enhanced plaintext logs)

rust-log-analyzer · 2026-10-27T23:40:49Z

The job test-aarch64-apple-macos-26-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Important

For more information how to resolve CI failures of this job, visit this link.

tgross35 · 2026-10-27T23:53:12Z

The hosted runner lost communication with the server. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.

@bors retry

@ghost

compiler-builtins subtree update Subtree update of `compiler-builtins` to rust-lang/compiler-builtins@da91091. Created using https://github.com/rust-lang/josh-sync. r? @ghost

JonathanBrouwer · 2026-10-28T09:47:29Z

@bors cancel
test-aarch64-apple-macos-26-2 failed 15 minutes ago and has been stuck cleaning orphaned processes ever since

rust-bors · 2026-10-28T09:47:33Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/40644973139

The next pull request likely to be tested is #165056.

@ghost

compiler-builtins subtree update Subtree update of `compiler-builtins` to rust-lang/compiler-builtins@da91091. Created using https://github.com/rust-lang/josh-sync. r? @ghost

rust-log-analyzer · 2026-10-28T15:19:56Z

The job test-x86_64-gnu failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

rust-bors · 2026-10-28T15:20:43Z

💔 Test for eacabf8 failed: CI. Failed job:

auto - test-x86_64-gnu (web logs, enhanced plaintext logs)

JonathanBrouwer · 2026-10-28T15:24:30Z

@bors retry

rust-bors · 2026-10-28T21:53:16Z

☀️ Test successful - CI
Approved by: tgross35
Duration: 3h 16m 44s
Pushing 92ffebe to main...

github-actions · 2026-10-28T21:56:37Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing ab019e7 (parent) -> 92ffebe (this PR)

Test differences

Show 2 test diffs

2 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 92ffebeceaa0a071066f233873c2438e73d70fe7 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

test-x86_64-rust-for-linux: 36m 9s -> 1h (+67.6%)
test-x86_64-gnu-gcc-core-tests: 9m 59s -> 16m 23s (+64.1%)
optional-test-x86_64-gnu-autodiff: 36m 2s -> 57m 38s (+59.9%)
test-x86_64-mingw-1: 2h -> 2h 59m (+48.9%)
dist-i686-linux: 1h 16m -> 1h 54m (+48.9%)
test-x86_64-gnu-parallel-frontend: 1h 16m -> 1h 50m (+44.4%)
dist-arm-linux-musl: 1h 18m -> 1h 50m (+41.7%)
test-armhf-gnu: 1h 33m -> 55m 49s (-40.2%)
dist-loongarch64-linux: 1h 32m -> 2h 7m (+37.7%)
test-x86_64-gnu-miri: 1h 26m -> 54m (-37.2%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2026-10-28T22:49:42Z

Finished benchmarking commit (92ffebe): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

If the regression was expected or you think it can be justified,
please write a comment with sufficient written justification, and add
@rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
If you think that you know of a way to resolve the regression, try to create
a new PR with a fix for the regression.
If you do not understand the regression or you think that it is just noise,
you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.5%	[0.5%, 0.5%]	1
Regressions ❌ (secondary)	0.2%	[0.1%, 0.2%]	7
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.1%]	3
All ❌✅ (primary)	0.5%	[0.5%, 0.5%]	1

Max RSS (memory usage)

Results (primary -0.6%, secondary 1.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.8%, 0.9%]	4
Regressions ❌ (secondary)	5.5%	[2.1%, 9.3%]	5
Improvements ✅ (primary)	-1.4%	[-5.4%, -0.5%]	8
Improvements ✅ (secondary)	-3.4%	[-4.8%, -0.7%]	4
All ❌✅ (primary)	-0.6%	[-5.4%, 0.9%]	12

Cycles

Results (primary -0.4%, secondary 1.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.4%, 1.2%]	6
Regressions ❌ (secondary)	3.8%	[0.5%, 9.6%]	9
Improvements ✅ (primary)	-1.3%	[-2.6%, -0.5%]	8
Improvements ✅ (secondary)	-4.2%	[-6.7%, -0.7%]	4
All ❌✅ (primary)	-0.4%	[-2.6%, 1.2%]	14

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 488.323s -> 488.483s (0.03%)
Artifact size: 405.89 MiB -> 405.90 MiB (0.00%)

tgross35 and others added 10 commits October 14, 2026 17:58

Add exp2m1f16

cc4edc0

Source: https://gitlab.inria.fr/core-math/core-math/-/blob/0bbf26a18f09e74675b6caca62aa4c3ff86c7bc2/src/binary16/exp2m1/exp2m1f16.c

test: Update exception handling symbols

8905553

Since [1], these symbols are now mangled so need a lang item indicator rather than `unsafe(no_mangle)`. This works on all platforms. It seems like we can build without the other `rust_eh` symbols nowadays as well. [1]: rust-lang#148413

Always build native aarch64 outline atomics

22c6b73

Never build the versions included with LLVM's compiler-rt library when the 'c' feature is enabled. The rust version should be no worse than those included with compiler-rt.

Prepare for merging from rust-lang/rust

b66e8f8

This updates the rust-version file to 8592206.

bench: Update pinned toolchain to nightly-2026-10-26

0cb30ea

ci: Resolve lints in python scripts

ada8969

ci: Ignore pinning issues for josh-sync/rustc-pull

f0bcb72

Signed-off-by: hashcatHitman <155700084+hashcatHitman@users.noreply.github.com>

renovate: Update benchmarks twice per month

a22db91

Currently this seems to be way more frequent, so reduce the PR noise.

rustbot added A-compiler-builtins Area: compiler-builtins (https://github.com/rust-lang/compiler-builtins) S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Oct 27, 2026

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tgross35 added 2 commits October 27, 2026 00:53

Resolve build warnings that were being hidden

8ab90ae

`CARGO_BUILD_WARNINGS=deny` exposed a handful of warnings about unused imports and dependencies. Fix everything before enabling in CI.

ci: Set CARGO_BUILD_WARNINGS=deny

25ca815

`RUSTFLAGS=-Dwarnings` is ignored by build scripts when `--target` is specified, so our builds were never getting fully validated. For now, `CARGO_BUILD_WARNINGS` is the best way to improve this.

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 27, 2026

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rust-bors Bot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 27, 2026

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 27, 2026

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rust-bors Bot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 28, 2026

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 28, 2026

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rust-bors Bot added merged-by-bors This PR was explicitly merged by bors. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 28, 2026

rust-bors Bot merged commit 92ffebe into rust-lang:main Oct 28, 2026
16 checks passed

rustbot added this to the 1.101.0 milestone Oct 28, 2026

rustbot added the perf-regression Performance regression. label Oct 28, 2026

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Test differences

Job duration changes

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rust-timer commented Oct 28, 2026

Overall result: ❌✅ regressions and improvements - please read:

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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tgross35 commented Oct 27, 2026 •

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