Update to LLVM 23 by nikic · Pull Request #158734 · rust-lang/rust

Update to LLVM 23 try-job: dist-x86_64-apple try-job: dist-apple-various try-job: dist-aarch64-apple try-job: aarch64-apple try-job: aarch64-apple-macos-26

rust-bors · 2026-07-16T14:24:02Z

💥 Test timed out after 21600s

nikic · 2026-07-16T14:34:31Z

@bors try @rust-timer queue

Update to LLVM 23

rust-bors · 2026-07-16T17:01:41Z

☀️ Try build successful (CI)
Build commit: 2c1f844 (2c1f8447a3951d07e7476a97da686dcd14a3e3cd)
Base parent: d62fb1c (d62fb1c8a007f6967376a52da8315ae51b64a70c)

nikic · 2026-07-16T17:12:55Z

@bors try jobs=dist-x86_64-apple,x86_64-mingw-1,x86_64-mingw-2,dist-i686-mingw,dist-x86_64-mingw,dist-aarch64-llvm-mingw,dist-x86_64-llvm-mingw

Update to LLVM 23 try-job: dist-x86_64-apple try-job: x86_64-mingw-1 try-job: x86_64-mingw-2 try-job: dist-i686-mingw try-job: dist-x86_64-mingw try-job: dist-aarch64-llvm-mingw try-job: dist-x86_64-llvm-mingw

rust-timer · 2026-07-16T17:57:48Z

Finished benchmarking commit (2c1f844): comparison URL.

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

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@rustbot label: -S-waiting-on-perf +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)	0.4%	[0.1%, 0.7%]	17
Regressions ❌ (secondary)	5.8%	[0.2%, 13.7%]	33
Improvements ✅ (primary)	-3.2%	[-15.7%, -0.2%]	158
Improvements ✅ (secondary)	-2.2%	[-11.7%, -0.2%]	202
All ❌✅ (primary)	-2.8%	[-15.7%, 0.7%]	175

Max RSS (memory usage)

Results (primary 1.0%, secondary -2.6%)

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

	mean	range	count
Regressions ❌ (primary)	4.8%	[2.1%, 8.1%]	5
Regressions ❌ (secondary)	3.4%	[2.7%, 4.1%]	4
Improvements ✅ (primary)	-1.4%	[-2.1%, -0.5%]	8
Improvements ✅ (secondary)	-3.2%	[-9.4%, -0.8%]	42
All ❌✅ (primary)	1.0%	[-2.1%, 8.1%]	13

Cycles

Results (primary -5.3%, secondary -2.2%)

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)	7.9%	[2.9%, 14.9%]	11
Improvements ✅ (primary)	-5.3%	[-11.8%, -1.4%]	58
Improvements ✅ (secondary)	-4.7%	[-8.8%, -2.2%]	44
All ❌✅ (primary)	-5.3%	[-11.8%, -1.4%]	58

Binary size

Results (primary -0.2%, secondary -0.8%)

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

	mean	range	count
Regressions ❌ (primary)	0.0%	[0.0%, 0.1%]	12
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	5
Improvements ✅ (primary)	-0.3%	[-1.3%, -0.0%]	35
Improvements ✅ (secondary)	-0.9%	[-1.3%, -0.0%]	59
All ❌✅ (primary)	-0.2%	[-1.3%, 0.1%]	47

Bootstrap: 489.85s -> 459.406s (-6.21%)
Artifact size: 389.48 MiB -> 397.37 MiB (2.03%)

rust-log-analyzer · 2026-07-16T18:50:33Z

The job dist-i686-mingw failed! Check out the build log: (web) (plain enhanced) (plain)

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

38372 ./src/llvm-project/clang/test/CodeGen/RISCV/rvv-intrinsics-autogenerated/non-policy
38282 ./src/gcc/gcc/testsuite/gcc.target/aarch64
37769 ./src/llvm-project/llvm/test/MC/Disassembler/AMDGPU
37559 ./src/doc
37316 ./src/llvm-project/llvm/test/CodeGen/AMDGPU/NextUseAnalysis

##[group]Run cd src/ci/citool
cd src/ci/citool
CARGO_INCREMENTAL=0 CARGO_TARGET_DIR=../../../build/citool cargo build
shell: c:/msys64/usr/bin\bash.EXE --noprofile --norc -e -o pipefail {0}
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---
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[2252/4003] Building CXX object lib/Target/AArch64/AsmParser/CMakeFiles/LLVMAArch64AsmParser.dir/AArch64AsmParser.cpp.obj
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[2584/4003] Building CXX object lib/Target/Hexagon/CMakeFiles/LLVMHexagonCodeGen.dir/HexagonSplitConst32AndConst64.cpp.obj
[2585/4003] Building CXX object lib/Target/Hexagon/CMakeFiles/LLVMHexagonCodeGen.dir/HexagonSplitDouble.cpp.obj
[2586/4003] Building CXX object lib/Target/Hexagon/CMakeFiles/LLVMHexagonCodeGen.dir/HexagonLoadStoreWidening.cpp.obj
[2587/4003] Building CXX object lib/Target/Hexagon/CMakeFiles/LLVMHexagonCodeGen.dir/HexagonSubtarget.cpp.obj
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[2749/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXMarkKernelPtrsGlobal.cpp.obj
[2750/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXLowerArgs.cpp.obj
[2751/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXISelLowering.cpp.obj
[2752/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXSetByValParamAlign.cpp.obj
[2753/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXPeephole.cpp.obj
[2754/4003] Building CXX object lib/Target/NVPTX/CMakeFiles/LLVMNVPTXCodeGen.dir/NVPTXProxyRegErasure.cpp.obj
---
[2881/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVELFObjectWriter.cpp.obj
[2882/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVMCAsmInfo.cpp.obj
[2883/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVInstPrinter.cpp.obj
[2884/4003] Building CXX object lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/GISel/RISCVInstructionSelector.cpp.obj
FAILED: lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/GISel/RISCVInstructionSelector.cpp.obj 
sccache D:\a\rust\rust\mingw32\bin\g++.exe -D_FILE_OFFSET_BITS=64 -D_GLIBCXX_USE_CXX11_ABI=1 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -ID:/a/rust/rust/build/i686-pc-windows-gnu/llvm/build/lib/Target/RISCV -ID:/a/rust/rust/src/llvm-project/llvm/lib/Target/RISCV -ID:/a/rust/rust/build/i686-pc-windows-gnu/llvm/build/include -ID:/a/rust/rust/src/llvm-project/llvm/include -ffunction-sections -fdata-sections -m32 -fno-omit-frame-pointer -Wa,-mbig-obj -Werror=date-time -w -ffunction-sections -fdata-sections  -O2 -DNDEBUG -std=c++17 -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/GISel/RISCVInstructionSelector.cpp.obj -MF lib\Target\RISCV\CMakeFiles\LLVMRISCVCodeGen.dir\GISel\RISCVInstructionSelector.cpp.obj.d -o lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/GISel/RISCVInstructionSelector.cpp.obj -c D:/a/rust/rust/src/llvm-project/llvm/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp

cc1plus.exe: out of memory allocating 33558527 bytes
[2885/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVBaseInfo.cpp.obj
[2886/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVMCExpr.cpp.obj
[2887/4003] Building CXX object lib/Target/RISCV/MCTargetDesc/CMakeFiles/LLVMRISCVDesc.dir/RISCVMCCodeEmitter.cpp.obj
---
   0: __rustc::rust_begin_unwind
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library\std\src/panicking.rs:679:5
   1: core::panicking::panic_fmt
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library\core\src/panicking.rs:80:14
   2: cmake::fail
   3: cmake::run
   4: <cmake::Config>::build
   5: <bootstrap::core::build_steps::llvm::Llvm as bootstrap::core::builder::Step>::run
             at .\src\bootstrap\src\core\build_steps\llvm.rs:557:13
   6: <bootstrap::core::builder::Builder>::ensure::<bootstrap::core::build_steps::llvm::Llvm>
             at .\src\bootstrap\src\core\builder\mod.rs:1650:36
   7: <bootstrap::core::build_steps::compile::Assemble as bootstrap::core::builder::Step>::run
             at .\src\bootstrap\src\core\build_steps\compile.rs:2146:69
   8: <bootstrap::core::builder::Builder>::ensure::<bootstrap::core::build_steps::compile::Assemble>
             at .\src\bootstrap\src\core\builder\mod.rs:1650:36
   9: <bootstrap::core::builder::Builder>::compiler
             at .\src\bootstrap\src\core\builder\mod.rs:1205:14
  10: bootstrap::core::build_steps::doc::prepare_doc_compiler
             at .\src\bootstrap\src\core\build_steps\doc.rs:853:34
  11: <bootstrap::core::build_steps::doc::UnstableBook as bootstrap::core::builder::Step>::make_run
             at .\src\bootstrap\src\core\build_steps\doc.rs:111:29
  12: <bootstrap::core::builder::StepDescription>::maybe_run
             at .\src\bootstrap\src\core\builder\mod.rs:480:13
  13: bootstrap::core::builder::cli_paths::match_paths_to_steps_and_run
             at .\src\bootstrap\src\core\builder\cli_paths.rs:142:22
  14: <bootstrap::core::builder::Builder>::run_step_descriptions
             at .\src\bootstrap\src\core\builder\mod.rs:1177:9
  15: <bootstrap::core::builder::Builder>::run_default_doc_steps
             at .\src\bootstrap\src\core\builder\mod.rs:1161:14
  16: <bootstrap::core::build_steps::dist::Docs as bootstrap::core::builder::Step>::run
             at .\src\bootstrap\src\core\build_steps\dist.rs:88:17
  17: <bootstrap::core::builder::Builder>::ensure::<bootstrap::core::build_steps::dist::Docs>
             at .\src\bootstrap\src\core\builder\mod.rs:1650:36
  18: <bootstrap::core::build_steps::dist::Docs as bootstrap::core::builder::Step>::make_run
             at .\src\bootstrap\src\core\build_steps\dist.rs:79:21
  19: <bootstrap::core::builder::StepDescription>::maybe_run
             at .\src\bootstrap\src\core\builder\mod.rs:480:13
  20: bootstrap::core::builder::cli_paths::match_paths_to_steps_and_run
             at .\src\bootstrap\src\core\builder\cli_paths.rs:142:22
  21: <bootstrap::core::builder::Builder>::run_step_descriptions
             at .\src\bootstrap\src\core\builder\mod.rs:1177:9
  22: <bootstrap::core::builder::Builder>::execute_cli
             at .\src\bootstrap\src\core\builder\mod.rs:1156:14
  23: <bootstrap::Build>::build
             at .\src\bootstrap\src\lib.rs:802:25
  24: bootstrap::main
             at .\src\bootstrap\src\bin\main.rs:157:11
  25: <fn() as core::ops::function::FnOnce<()>>::call_once
             at /rustc/08d5b675a9b2abdca5e2fe4eabe0e07bbda15d49/library\core\src\ops\function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

rust-bors · 2026-07-16T21:41:47Z

💔 Test for de5468d failed: CI. Failed jobs:

try - dist-i686-mingw (web logs, enhanced plaintext logs)
try - x86_64-mingw-1 (web logs, enhanced plaintext logs)

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rust-bors Bot pushed a commit that referenced this pull request Jul 3, 2026

Auto merge of #158734 - nikic:llvm23, r=<try>

b003a3f

Update to LLVM 23

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nikic force-pushed the llvm23 branch from 5ae3f12 to 26b9e8a Compare July 13, 2026 14:39

rustbot added A-CI Area: Our Github Actions CI A-testsuite Area: The testsuite used to check the correctness of rustc T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Jul 13, 2026

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Auto merge of #158734 - nikic:llvm23, r=<try>

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Update to LLVM 23

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nikic force-pushed the llvm23 branch from 26b9e8a to cbbd380 Compare July 14, 2026 07:12

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Auto merge of #158734 - nikic:llvm23, r=<try>

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Update to LLVM 23

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nikic force-pushed the llvm23 branch from cbbd380 to b052a0d Compare July 14, 2026 08:55

nikic added 7 commits July 16, 2026 10:06

Update global_asm tests for LLVM 23

b1a400d

There is now only a single "module asm", not one before each line.

Adjust codegen test for LLVM 23

de9c20c

The assume here is not really relevant to the purpose of the test, and it's position changed in LLVM 23.

Update simd mask test for LLVM 23

7c76557

Codegen changed in: llvm/llvm-project@66c1b6f

Disable slice is_ascii() test on LLVM 23

d66ddad

This doesn't optimize as desired since: llvm/llvm-project@21f439f

Adjust PGO tests for LLVM 23

d346339

These now have additional !guid metadata.

Update enzyme

33f6fe2

Set LLVM_VERSIONED_DYLIB_NAME_ON_DARWIN=OFF

816857b

We probably want to change this to align with Linux, but for now keep the old behavior.

nikic force-pushed the llvm23 branch from b55a337 to 816857b Compare July 16, 2026 08:14

rustbot added the T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) label Jul 16, 2026

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Distribute llvm-project/libc

5670b4a

It's a dependency of LLVM now.

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rust-bors Bot pushed a commit that referenced this pull request Jul 16, 2026

Auto merge of #158734 - nikic:llvm23, r=<try>

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Update to LLVM 23 try-job: dist-x86_64-apple try-job: dist-apple-various try-job: dist-aarch64-apple try-job: aarch64-apple try-job: aarch64-apple-macos-26

Update LLVM & Enzyme

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rust-bors Bot pushed a commit that referenced this pull request Jul 16, 2026

Auto merge of #158734 - nikic:llvm23, r=<try>

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rust-timer commented Jul 16, 2026

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

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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nikic commented Jul 3, 2026 •

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