[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]()

| 51.92 ns | 125.85 ns | 2.42 | 0.11 | False | | |
|

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

| 41.85 ns | 72.95 ns | 1.74 | 0.12 | False | | |
|

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

| 73.90 ns | 90.93 ns | 1.23 | 0.09 | False | | |
|

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

| 60.74 ns | 66.15 ns | 1.09 | 0.16 | 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 the benchmark source at src/benchmarks/micro/libraries/System.Runtime/Perf.UInt32.cs lines 27-36 and review the baseline/compare commits and regression report. Run the documented benchmarks_ci.py command for System.Tests.Perf_UInt32, then use the profiling and benchmarking workflow docs to investigate the four Linux/x64 WASM regressions. Done means the affected benchmarks no longer regress against the baseline.

Written by the indexing model from the issue text.