[Perf] Linux/arm64: 2 Improvements on 1/13/2026 5:53:23 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [7ed6f1c3f40857b643a291e89ca09e8bdb750c5b](https://github.com/dotnet/runtime/commit/7ed6f1c3f40857b643a291e89ca09e8bdb750c5b)
Compare | [8b78becefd70f4876093619372f1e72a621a17b2](https://github.com/dotnet/runtime/commit/8b78becefd70f4876093619372f1e72a621a17b2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7ed6f1c3f40857b643a291e89ca09e8bdb750c5b...8b78becefd70f4876093619372f1e72a621a17b2)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Perf_Convert

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

• [ToBase64String - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.22 μs | 1.62 μs | 0.73 | 0.00 | False | | |
|

• [ToBase64CharArray - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.01 μs | 1.44 μs | 0.71 | 0.00 | 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.Perf_Convert*'
```

### System.Perf_Convert.ToBase64String(formattingOptions: InsertLineBreaks)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64CharArray(binaryDataSize: 1024, formattingOptions: InsertLineBreaks)

#### 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)