[Perf] Linux/x64: 1 Regression on 5/23/2026 1:42:53 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [f2c9dc4cbcb05c580b08eed6b9eebe1998795a41](https://github.com/dotnet/runtime/commit/f2c9dc4cbcb05c580b08eed6b9eebe1998795a41)
Compare | [7da2acb927da6ac7ad636043d6e0362fed3dfde9](https://github.com/dotnet/runtime/commit/7da2acb927da6ac7ad636043d6e0362fed3dfde9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f2c9dc4cbcb05c580b08eed6b9eebe1998795a41...7da2acb927da6ac7ad636043d6e0362fed3dfde9)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Text.Tests.Perf_StringBuilder

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

• [Append_Char - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config 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.Text.Tests.Perf_StringBuilder*'
```

### System.Text.Tests.Perf_StringBuilder.Append_Char(length: 100)

#### 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)