[Perf] Linux/x64: 1 Improvement on 8/10/2026 5:38:55 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [ab094c18ba7f4a96d145afd8b34f965c5c3ef31d](https://github.com/dotnet/runtime/commit/ab094c18ba7f4a96d145afd8b34f965c5c3ef31d)
Compare | [c12540eb53044276c55a86c3a834c662eff2872f](https://github.com/dotnet/runtime/commit/c12540eb53044276c55a86c3a834c662eff2872f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ab094c18ba7f4a96d145afd8b34f965c5c3ef31d...c12540eb53044276c55a86c3a834c662eff2872f)
Configs | CompilationMode:wasm, RunKind:micro

### Improvements in System.Memory.Span<Char>

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

• [CopyToSame - 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span*'
```

### System.Memory.Span<Char>.CopyToSame(Size: 3000)

#### 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 source at src/benchmarks/micro/libraries/System.Memory/Span.cs#L47-L48 and the linked performance report for System.Memory.Span.CopyToSame(Size: 3000). Reproduce it with scripts/benchmarks_ci.py using the provided filter and review the profiling and benchmarking workflow docs; the issue does not specify a code change or acceptance criteria.

Written by the indexing model from the issue text.