[Perf] Linux/arm64: 4 Improvements on 7/17/2026 11:45:18 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [929271670357bdecd4454c3d126c6b0afc581aa5](https://github.com/dotnet/runtime/commit/929271670357bdecd4454c3d126c6b0afc581aa5)
Compare | [3522269feadf7e6d9a5ed422ccd269335ebe62a9](https://github.com/dotnet/runtime/commit/3522269feadf7e6d9a5ed422ccd269335ebe62a9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/929271670357bdecd4454c3d126c6b0afc581aa5...3522269feadf7e6d9a5ed422ccd269335ebe62a9)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Linq.Tests.Perf_Enumerable

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

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

| 383.04 ns | 227.03 ns | 0.59 | 0.05 | False | | |
|

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

| 800.26 ns | 634.09 ns | 0.79 | 0.01 | False | | |
|

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

| 1.90 μs | 1.73 μs | 0.91 | 0.01 | False | | |
|

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

| 2.53 μs | 2.39 μs | 0.94 | 0.01 | False | | |

![graph]()
![graph]()
![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.Linq.Tests.Perf_Enumerable*'
```

### System.Linq.Tests.Perf_Enumerable.ToArray(input: IEnumerable)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.Reverse(input: IEnumerable)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.OrderBy(input: IEnumerable)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.OrderByDescending(input: IEnumerable)

#### 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 benchmark source in performance/src/benchmarks/micro/libraries/System.Linq/Perf.Enumerable.cs and run the provided benchmarks_ci.py command for System.Linq.Tests.Perf_Enumerable. Compare the reported baseline and test results on Linux/arm64. The issue does not specify a code change or acceptance criterion, so the needed outcome is triage of whether these improvements require runtime work.

Written by the indexing model from the issue text.