[Perf] Linux/x64: 1 Regression on 6/11/2026 11:26:48 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd](https://github.com/dotnet/runtime/commit/f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd)
Compare | [2f3821520acb47a26220fe08ee13cb89b3a38572](https://github.com/dotnet/runtime/commit/2f3821520acb47a26220fe08ee13cb89b3a38572)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f59cad6eaf5bbe1c3da6aea07e998f686c0ef0bd...2f3821520acb47a26220fe08ee13cb89b3a38572)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.ContainsTrueComparer<String>

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

• [FrozenSet - 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.Collections.ContainsTrueComparer*'
```

### System.Collections.ContainsTrueComparer<String>.FrozenSet(Size: 512)

#### 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 linked benchmark source in performance/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrueComparer.cs at lines 115-124 and compare the listed baseline and test commits. Run the provided benchmarks_ci.py command, then inspect the linked test report and performance history to confirm the FrozenSet regression. Done means the regression is explained and the issue has a documented disposition.

Written by the indexing model from the issue text.