[Perf] Linux/x64: 4 Regressions on 8/26/2026 4:02:35 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [8baacb006f5615ebd705bdf9de98ca5df7bf1ba1](https://github.com/dotnet/runtime/commit/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1)
Compare | [08df03ba6493589f3816e193847b50f105bf4c7a](https://github.com/dotnet/runtime/commit/08df03ba6493589f3816e193847b50f105bf4c7a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1...08df03ba6493589f3816e193847b50f105bf4c7a)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.Tests.Perf_UInt32

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

• [TryFormat - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 52.19 ns | 126.10 ns | 2.42 | 0.10 | False | | |
|

• [TryFormat - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 42.08 ns | 81.67 ns | 1.94 | 0.11 | False | | |
|

• [ToString - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 70.75 ns | 90.48 ns | 1.28 | 0.09 | False | | |
|

• [ToString - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 59.88 ns | 67.44 ns | 1.13 | 0.14 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_UInt32*'
```

### System.Tests.Perf_UInt32.TryFormat(value: 4294967295)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_UInt32.TryFormat(value: 12345)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_UInt32.ToString(value: 4294967295)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_UInt32.ToString(value: 12345)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

Start with src/benchmarks/micro/libraries/System.Runtime/Perf.UInt32.cs and run the documented scripts/benchmarks_ci.py command filtered to System.Tests.Perf_UInt32. Compare the baseline and compare commits and review the linked test report and graphs for the four WASM regressions. Done means the regression is explained and the affected benchmarks no longer show the reported slowdown.

Written by the indexing model from the issue text.