[Perf] Windows/x86: 1 Regression on 3/23/2026 11:28:12 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [982dc8a14ab4d03622559aec0effd98de13705c0](https://github.com/dotnet/runtime/commit/982dc8a14ab4d03622559aec0effd98de13705c0)
Compare | [509a2f1fed4126559143296ec6886babaf8e24c3](https://github.com/dotnet/runtime/commit/509a2f1fed4126559143296ec6886babaf8e24c3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/982dc8a14ab4d03622559aec0effd98de13705c0...509a2f1fed4126559143296ec6886babaf8e24c3)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Formats.Tar.Tests.Perf_TarWriter

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

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

| 1.49 μs | 1.81 μs | 1.22 | 0.01 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Formats.Tar.Tests.Perf_TarWriter*'
```

### System.Formats.Tar.Tests.Perf_TarWriter.PaxTarEntry_WriteEntry

#### 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)