[Perf] Linux/arm64: 1 Regression on 7/23/2026 8:26:45 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [026096b77a9dcfe0368a5d04d6fdc28efc3865d1](https://github.com/dotnet/runtime/commit/026096b77a9dcfe0368a5d04d6fdc28efc3865d1)
Compare | [7ffec088158c895276b85cf176e37904f7d53a56](https://github.com/dotnet/runtime/commit/7ffec088158c895276b85cf176e37904f7d53a56)
Diff | [Diff](https://github.com/dotnet/runtime/compare/026096b77a9dcfe0368a5d04d6fdc28efc3865d1...7ffec088158c895276b85cf176e37904f7d53a56)
Configs | CompilationMode:tiered, RunKind:micro

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

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

• [SortedSet - 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CtorFromCollection*'
```

### System.Collections.CtorFromCollection<Int32>.SortedSet(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 src/benchmarks/micro/libraries/System.Collections/Create/CtorFromCollection.cs at lines 63-64 and run the provided benchmarks_ci.py command for System.Collections.CtorFromCollection. Compare the baseline and test commits and inspect the linked report; done means the arm64 regression is explained and the benchmark no longer shows the reported slowdown.

Written by the indexing model from the issue text.