[Perf] Linux/arm64: 2 Improvements 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, 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]()

| 7.54 ns | 2.40 ns | 0.32 | 0.28 | False | | |

![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)

---

### 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, RunKind:micro

### Improvements in System.Numerics.Tests.Perf_BigInteger

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

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

| 13.86 ns | 7.83 ns | 0.56 | 0.26 | False | | |

![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.Numerics.Tests.Perf_BigInteger*'
```

### System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray(numberString: -2147483648)

#### 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 benchmark sources linked for Microsoft.Extensions.Primitives.StringSegmentBenchmark.cs and Perf.BigInteger.cs, then run the provided benchmarks_ci.py commands from the dotnet/performance repository. Compare the ARM64 Azure Linux results with the linked baseline and report or address a confirmed performance issue, with the relevant benchmark improvement reproduced.

Written by the indexing model from the issue text.