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Update LLVM submodule - #164254

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nikic:llvm-update-4
Oct 15, 2026
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rust-lang:mainfrom
nikic:llvm-update-4

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@nikic

@nikic nikic commented Oct 13, 2026

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Update LLVM submodule to a newer snapshot of release/23.x. It should resolve the following issues:

#164137
#163737
#163677
#163616
#163311

@rustbot rustbot added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 13, 2026
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r? @cuviper

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  • Owners of files modified in this PR: @cuviper

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⚠️ Warning ⚠️

@nikic nikic added beta-nominated Nominated for backporting to the compiler in the beta channel. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 13, 2026
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@bors r+ rollup=never

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📌 Commit f8d7cc9 has been approved by cuviper

It is now in the queue for this repository.

@rust-bors 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 14, 2026
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@bors p=6 scheduling

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rust-bors Bot pushed a commit that referenced this pull request Oct 14, 2026
Update LLVM submodule

Update LLVM submodule to a newer snapshot of release/23.x. It should resolve the following issues:

#164137
#163737
#163677
#163616
#163311
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The job test-aarch64-msvc-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)
---- [run-make] tests\run-make\clear-error-blank-output stdout ----

error: rmake recipe failed to complete
status: exit code: 101
command: "C:\\a\\rust\\rust\\build\\aarch64-pc-windows-msvc\\test\\run-make\\clear-error-blank-output\\rmake.exe"
stdout: none
--- stderr -------------------------------

thread 'main' (4236) panicked at C:\a\rust\rust\tests\run-make\clear-error-blank-output\rmake.rs:11:64:
called `Result::unwrap()` on an `Err` value: Os { code: 232, kind: BrokenPipe, message: "The pipe is being closed." }
---
Currently active steps:
test::RunMake { test_compiler: Compiler { stage: 2, host: aarch64-pc-windows-msvc, forced_compiler: false }, target: aarch64-pc-windows-msvc } at src\bootstrap\src\core\build_steps\test.rs:2108
test::Compiletest { test_compiler: Compiler { stage: 2, host: aarch64-pc-windows-msvc, forced_compiler: false }, target: aarch64-pc-windows-msvc, mode: run-make, suite: "run-make", path: "tests/run-make", compare_mode: None } at src\bootstrap\src\core\build_steps\test.rs:2108
Build completed unsuccessfully in 1:52:12
make: *** [Makefile:115: ci-msvc-py] Error 1
  local time: Wed Oct 14 11:54:34 PDT 2026
  network time: Wed, 14 Oct 2026 18:54:35 GMT
##[error]Process completed with exit code 2.
##[group]Run echo "disk usage:"
echo "disk usage:"

@rust-bors 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 14, 2026
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💔 Test for 0187058 failed: CI. Failed job:

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nikic commented Oct 14, 2026

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@bors retry broken pipe

@rust-bors 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 14, 2026
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@rust-bors 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 15, 2026
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☀️ Test successful - CI
Approved by: cuviper
Duration: 4h 41m 13s
Pushing 701ce39 to main...

@rust-bors
rust-bors Bot merged commit 701ce39 into rust-lang:main Oct 15, 2026
15 checks passed
@rustbot rustbot added this to the 1.101.0 milestone Oct 15, 2026
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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 7df8138 (parent) -> 701ce39 (this PR)

Test differences

Show 56 test diffs

Stage 1

  • [ui (polonius)] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32e_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui (polonius)] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32em_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui (polonius)] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32emc_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui (polonius)] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui (polonius)] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui (polonius)] tests/ui/explicit-tail-calls/support/byval.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui (polonius)] tests/ui/explicit-tail-calls/support/byval.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32e_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32em_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32emc_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J0)
  • [ui] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui] tests/ui/explicit-tail-calls/support/byval.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [ui] tests/ui/explicit-tail-calls/support/byval.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J0)
  • [codegen] tests/codegen-llvm/array-cmp.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/asm-aarch64-x30.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/enum/enum-match.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#aarch64sf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J1)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#armhf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J1)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#armsf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J1)
  • [codegen] tests/codegen-llvm/function-arguments.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/gpu-launch-sized-workgroup-memory.rs#nvptx-pre-llvm-23: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/issues/issue-118306.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/issues/issue-37945.rs#old: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/llvm-writable.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)
  • [codegen] tests/codegen-llvm/pow_known_base.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J1)

Stage 2

  • [assembly] tests/assembly-llvm/simd-bitmask.rs#aarch64-llvm-pre-23: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [assembly] tests/assembly-llvm/simd-intrinsic-mask-reduce.rs#aarch64-llvm22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [assembly] tests/assembly-llvm/simd-intrinsic-select.rs#x86-avx-512: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J2)
  • [assembly] tests/assembly-llvm/slice-is_ascii.rs#LIN: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [assembly] tests/assembly-llvm/slice-is_ascii.rs#WIN: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/array-cmp.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/asm-aarch64-x30.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/enum/enum-match.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#aarch64sf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J2)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#armhf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J2)
  • [codegen] tests/codegen-llvm/float/abi-flag.rs#armsf: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J2)
  • [codegen] tests/codegen-llvm/function-arguments.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/gpu-launch-sized-workgroup-memory.rs#nvptx-pre-llvm-23: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/issues/issue-118306.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/issues/issue-37945.rs#old: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/llvm-writable.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [codegen] tests/codegen-llvm/pow_known_base.rs#LLVM22: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J2)
  • [ui] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J3)
  • [ui] tests/ui/explicit-tail-calls/support/bystack.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J3)
  • [ui] tests/ui/explicit-tail-calls/support/byval.rs#loongarch32: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J3)
  • [ui] tests/ui/explicit-tail-calls/support/byval.rs#loongarch64: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 21) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 21) (J3)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32e_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J4)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32em_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J4)
  • [ui] tests/ui/asm/riscv/riscv32e-registers.rs#riscv32emc_llvm24: ignore (ignored when the LLVM version 23.1.3 is older than 24.0.0) -> ignore (ignored when the LLVM version 23.1.4 is older than 24.0.0) (J4)
  • [run-make] tests/run-make/compressed-debuginfo-zstd: pass -> ignore (ignored if LLVM wasn't build with zstd for ELF section compression or LLVM is not the default codegen backend) (J5)
  • [codegen] tests/codegen-llvm/array-equality.rs#llvm-current: ignore (ignored when the LLVM version (23.1.3) is newer than majorversion 22) -> ignore (ignored when the LLVM version (23.1.4) is newer than majorversion 22) (J6)

Additionally, 4 doctest diffs were found. These are ignored, as they are noisy.

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 701ce39ddc3b02efdf5146fd76c861b06c52aeb3 --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

  1. dist-arm-linux-musl: 1h 17m -> 4h 39m (+259.1%)
  2. test-armhf-gnu: 59m 52s -> 1h 47m (+80.0%)
  3. test-x86_64-rust-for-linux: 40m 31s -> 1h 10m (+74.6%)
  4. test-x86_64-gnu-gcc: 56m 54s -> 1h 35m (+68.1%)
  5. test-x86_64-gnu-next-trait-solver-polonius: 44m 40s -> 1h 11m (+59.7%)
  6. test-x86_64-gnu-miri: 49m 44s -> 1h 15m (+52.6%)
  7. test-x86_64-gnu-aux: 1h 39m -> 2h 22m (+42.6%)
  8. dist-i686-linux: 1h 18m -> 1h 47m (+37.2%)
  9. test-i686-gnu-nopt-1: 2h 18m -> 1h 27m (-36.7%)
  10. dist-sparcv9-solaris: 1h 42m -> 1h 6m (-35.2%)
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

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Finished benchmarking commit (701ce39): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

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
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-0.3% [-0.4%, -0.2%] 5
All ❌✅ (primary) - - 0

Max RSS (memory usage)

Results (secondary -3.0%)

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

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-3.0% [-3.0%, -3.0%] 1
All ❌✅ (primary) - - 0

Cycles

Results (secondary 4.1%)

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

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
4.1% [4.1%, 4.1%] 1
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) - - 0

Binary size

Results (primary -0.1%, secondary -0.0%)

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

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.1% [-0.1%, -0.0%] 4
Improvements ✅
(secondary)
-0.0% [-0.0%, -0.0%] 1
All ❌✅ (primary) -0.1% [-0.1%, -0.0%] 4

Bootstrap: 489.902s -> 488.749s (-0.24%)
Artifact size: 407.05 MiB -> 407.05 MiB (0.00%)

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rustbot commented Oct 15, 2026

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beta backport approved as per compiler team on Zulip. A backport PR will be authored by the release team at the end of the current development cycle. Backport labels are handled by them.

@rustbot rustbot added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Oct 15, 2026
@cuviper cuviper mentioned this pull request Oct 15, 2026
@cuviper cuviper modified the milestones: 1.101.0, 1.100.0 Oct 15, 2026
@cuviper cuviper removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Oct 15, 2026
rust-bors Bot pushed a commit that referenced this pull request Oct 16, 2026
[beta] backports

- Fix fudging #163442
- restore the old behavior for `derive(Default)` on fieldless types #164114
- Update LLVM submodule #164254

r? me
rust-bors Bot pushed a commit that referenced this pull request Oct 16, 2026
[beta] backports

- Fix fudging #163442
- restore the old behavior for `derive(Default)` on fieldless types #164114
- Update LLVM submodule #164254

r? me
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. beta-accepted Accepted for backporting to the compiler in the beta channel. merged-by-bors This PR was explicitly merged by bors. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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6 participants