[Perf] Linux/x64: 1 Regression on 6/22/2026 5:32:56 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [b4ca93f1d026919b29a1000cf520db442cabf61b](https://github.com/dotnet/runtime/commit/b4ca93f1d026919b29a1000cf520db442cabf61b)
Compare | [2fb056790aea48d9d94e221309c506b2a2506849](https://github.com/dotnet/runtime/commit/2fb056790aea48d9d94e221309c506b2a2506849)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b4ca93f1d026919b29a1000cf520db442cabf61b...2fb056790aea48d9d94e221309c506b2a2506849)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Collections.CtorGivenSize<Int32>

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.CtorGivenSize*'
```

### System.Collections.CtorGivenSize<Int32>.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 benchmark source at src/benchmarks/micro/libraries/System.Collections/Create/CtorGivenSize.cs and the linked performance report, then follow docs/benchmarking-workflow-dotnet-runtime.md. Reproduce System.Collections.CtorGivenSize.Dictionary(Size: 512) with the provided benchmarks_ci.py command and compare the baseline and test commits. Done means the regression is explained and the benchmark result is restored or an actionable runtime fix is identified.

Written by the indexing model from the issue text.