[Perf] Linux/x64: 1 Regression on 5/21/2026 3:23:32 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [48a921283413c94a8153e0c1d7ab6aadf2952580](https://github.com/dotnet/runtime/commit/48a921283413c94a8153e0c1d7ab6aadf2952580)
Compare | [96959a64df6ba4e5c62c4c68d9b91881f8141e79](https://github.com/dotnet/runtime/commit/96959a64df6ba4e5c62c4c68d9b91881f8141e79)
Diff | [Diff](https://github.com/dotnet/runtime/compare/48a921283413c94a8153e0c1d7ab6aadf2952580...96959a64df6ba4e5c62c4c68d9b91881f8141e79)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_Single

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

• [ToStringWithFormat - 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.Tests.Perf_Single*'
```

### System.Tests.Perf_Single.ToStringWithFormat(value: 3.4028235E+38, format: "E")

#### 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)