[Perf] Linux/arm64: 1 Improvement on 7/10/2026 8:58:27 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [34379cf2d31415960357ba887aa41c2ce5d7f42c](https://github.com/dotnet/runtime/commit/34379cf2d31415960357ba887aa41c2ce5d7f42c)
Compare | [7a4bdd9b9001c097875ad0e085759b687a524291](https://github.com/dotnet/runtime/commit/7a4bdd9b9001c097875ad0e085759b687a524291)
Diff | [Diff](https://github.com/dotnet/runtime/compare/34379cf2d31415960357ba887aa41c2ce5d7f42c...7a4bdd9b9001c097875ad0e085759b687a524291)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Improvements in Microsoft.Extensions.Primitives.StringSegmentBenchmark

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

• [Ctor_String - 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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*'
```

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Ctor_String

#### 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 Microsoft.Extensions.Primitives.StringSegmentBenchmark.Ctor_String entry and its benchmark source at performance/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs. Run the provided benchmarks_ci.py command, then compare the arm64 AzureLinux result with the linked baseline. Done means the reported improvement is reproducible and its cause or appropriate triage outcome is documented.

Written by the indexing model from the issue text.