[Perf] Windows/x86: 1 Improvement on 7/7/2026 1:33:18 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [d720474264849c4dafe6e28dc5bd679b4ddbe5fe](https://github.com/dotnet/runtime/commit/d720474264849c4dafe6e28dc5bd679b4ddbe5fe)
Compare | [4245753ead3ca70a287ac1234cd91ce1b782d5a8](https://github.com/dotnet/runtime/commit/4245753ead3ca70a287ac1234cd91ce1b782d5a8)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d720474264849c4dafe6e28dc5bd679b4ddbe5fe...4245753ead3ca70a287ac1234cd91ce1b782d5a8)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Memory.Span<Int32>

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

• [Fill - 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 'System.Memory.Span*'
```

### System.Memory.Span<Int32>.Fill(Size: 512)

#### 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 lines 53-54 and run the provided benchmarks_ci.py command for System.Memory.Span.Fill. Compare the baseline and test reports linked in the issue, then determine whether the measured improvement needs follow-up or documentation.

Written by the indexing model from the issue text.