[Perf] Linux/x64: 1 Regression on 9/13/2026 9:42:54 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [40caa5753b677322f2202f6fd1037660e85b45b6](https://github.com/dotnet/runtime/commit/40caa5753b677322f2202f6fd1037660e85b45b6)
Compare | [7c6ee24c205574bc255aca3be398d39ec2d82b27](https://github.com/dotnet/runtime/commit/7c6ee24c205574bc255aca3be398d39ec2d82b27)
Diff | [Diff](https://github.com/dotnet/runtime/compare/40caa5753b677322f2202f6fd1037660e85b45b6...7c6ee24c205574bc255aca3be398d39ec2d82b27)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

• [Dictionary - 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.IterateForEach*'
```

### System.Collections.IterateForEach<String>.Dictionary(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 reported System.Collections.IterateForEach.Dictionary(Size: 512) benchmark and run the supplied benchmarks_ci.py command from the dotnet/performance repository. Compare the baseline and test commits, then inspect IterateForEach.cs at the linked benchmark source and the profiling and benchmarking workflow docs. Done means the regression is reproduced and its responsible change or resolution is established.

Written by the indexing model from the issue text.