[Perf] Linux/x64: 1 Regression on 7/21/2026 3:22:49 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2c87bd2b64912ec925d9c419c35fe82d5086b13f](https://github.com/dotnet/runtime/commit/2c87bd2b64912ec925d9c419c35fe82d5086b13f)
Compare | [5ffdd753b0146f0ec95786b2af0ab7da0b37d061](https://github.com/dotnet/runtime/commit/5ffdd753b0146f0ec95786b2af0ab7da0b37d061)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2c87bd2b64912ec925d9c419c35fe82d5086b13f...5ffdd753b0146f0ec95786b2af0ab7da0b37d061)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

• [IDictionary - 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.AddGivenSize*'
```

### System.Collections.AddGivenSize<String>.IDictionary(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 System.Collections.AddGivenSize benchmark source at src/benchmarks/micro/libraries/System.Collections/Add/AddGivenSize.cs#L73-L75, then compare the baseline and compare commits and run the supplied benchmarks_ci.py command. Done means identifying and correcting the cause of the IDictionary(Size: 512) duration regression, with the benchmark no longer reproducing the reported slowdown.

Written by the indexing model from the issue text.