[Perf] Windows/x86: 1 Regression on 3/7/2026 1:24:57 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [64efb69573d1aa99fa89a96de18ba3247b2bb75e](https://github.com/dotnet/runtime/commit/64efb69573d1aa99fa89a96de18ba3247b2bb75e)
Compare | [f09bc75bec8a9de106d5766bc27ac35e5320569c](https://github.com/dotnet/runtime/commit/f09bc75bec8a9de106d5766bc27ac35e5320569c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/64efb69573d1aa99fa89a96de18ba3247b2bb75e...f09bc75bec8a9de106d5766bc27ac35e5320569c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Cache

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

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

| 10.93 ms | 11.75 ms | 1.08 | 0.03 | 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.Text.RegularExpressions.Tests.Perf_Regex_Cache*'
```

### System.Text.RegularExpressions.Tests.Perf_Regex_Cache.IsMatch_Multithreading(total: 40000, unique: 1600, cacheSize: 3200)

#### 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)