[Perf] Linux/arm64: 2 Improvements on 6/3/2026 5:42:33 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [2790c60428c37ef3c0a33941e10f867aa79c51b7](https://github.com/dotnet/runtime/commit/2790c60428c37ef3c0a33941e10f867aa79c51b7)
Compare | [3b0dd88d6cbd8c1ccdd57f20e831e877f742c9f6](https://github.com/dotnet/runtime/commit/3b0dd88d6cbd8c1ccdd57f20e831e877f742c9f6)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2790c60428c37ef3c0a33941e10f867aa79c51b7...3b0dd88d6cbd8c1ccdd57f20e831e877f742c9f6)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.IndexerSet<Int32>

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

• [OrderedDictionary - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 5.23 μs | 3.17 μs | 0.61 | 0.18 | False | | |
|

• [ConcurrentDictionary - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 17.97 μs | 15.63 μs | 0.87 | 0.11 | False | | |

![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.IndexerSet*'
```

### System.Collections.IndexerSet<Int32>.OrderedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IndexerSet<Int32>.ConcurrentDictionary(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)