[Perf] Windows/x64: 1 Regression on 7/12/2026 12:03:31 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [a7ed27ba3f7a0a32634be47079ac659909797806](https://github.com/dotnet/runtime/commit/a7ed27ba3f7a0a32634be47079ac659909797806)
Compare | [010acabe079d1bd50f838de34e9815f81d977469](https://github.com/dotnet/runtime/commit/010acabe079d1bd50f838de34e9815f81d977469)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a7ed27ba3f7a0a32634be47079ac659909797806...010acabe079d1bd50f838de34e9815f81d977469)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in Benchstone.BenchI.CSieve

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

• [Test - 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Benchstone.BenchI.CSieve*'
```

### Benchstone.BenchI.CSieve.Test

#### 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 Benchstone.BenchI.CSieve source in performance/src/benchmarks/micro/runtime/Benchstones/BenchI/CSieve.cs and the linked baseline/compare commits. Run the provided benchmarks_ci.py command and consult the benchmarking workflow documentation to reproduce the Windows/x64 regression. Done means the reported slowdown is reproduced and its cause and resolution are validated.

Written by the indexing model from the issue text.