[Perf] Windows/x64: 1 Regression on 9/12/2026 9:05:57 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0fd08c887c1317055025965cbe829b732fbe942d](https://github.com/dotnet/runtime/commit/0fd08c887c1317055025965cbe829b732fbe942d)
Compare | [b9678dcc0e7bac74a0d6b669b39d1007359b0016](https://github.com/dotnet/runtime/commit/b9678dcc0e7bac74a0d6b669b39d1007359b0016)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0fd08c887c1317055025965cbe829b732fbe942d...b9678dcc0e7bac74a0d6b669b39d1007359b0016)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.Perf_LengthBucketsFrozenDictionary

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

• [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
• [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 'System.Collections.Perf_LengthBucketsFrozenDictionary*'
```

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 10000, ItemsPerBucket: 1)

#### 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 System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_False_FrozenDictionary benchmark and run the supplied benchmarks_ci.py command. Compare the baseline and test commits, then use the linked test report and profiling workflow to identify the regression. Done means the cause is understood and the benchmark result is validated against the baseline.

Written by the indexing model from the issue text.