[Perf] Linux/arm64: 2 Improvements on 7/10/2026 7:46:47 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [0dc2424cb92416af77d8d38292cdcdffa699bd67](https://github.com/dotnet/runtime/commit/0dc2424cb92416af77d8d38292cdcdffa699bd67)
Compare | [23af95082d4a82710618cce7100116098d6c0298](https://github.com/dotnet/runtime/commit/23af95082d4a82710618cce7100116098d6c0298)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0dc2424cb92416af77d8d38292cdcdffa699bd67...23af95082d4a82710618cce7100116098d6c0298)
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]()

| 5.75 ns | 1.84 ns | 0.32 | 0.03 | 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
python3 .\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 | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [0dc2424cb92416af77d8d38292cdcdffa699bd67](https://github.com/dotnet/runtime/commit/0dc2424cb92416af77d8d38292cdcdffa699bd67)
Compare | [23af95082d4a82710618cce7100116098d6c0298](https://github.com/dotnet/runtime/commit/23af95082d4a82710618cce7100116098d6c0298)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0dc2424cb92416af77d8d38292cdcdffa699bd67...23af95082d4a82710618cce7100116098d6c0298)
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]()

| 13.93 ns | 12.39 ns | 0.89 | 0.03 | 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
python3 .\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 src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs and src/benchmarks/micro/libraries/System.Runtime.Numerics/Perf.BigInteger.cs. Run the two supplied benchmarks with benchmarks_ci.py, then compare the arm64 Ubuntu 22.04 results with the linked reports and baseline commits. Done means reproducing and explaining the reported improvements or identifying the required follow-up.

Written by the indexing model from the issue text.