[Perf] Linux/x64: 1 Regression on 7/22/2026 4:13:56 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a4b2df0e43b45c9a5ecb638bf0bb92ebef9234f0](https://github.com/dotnet/runtime/commit/a4b2df0e43b45c9a5ecb638bf0bb92ebef9234f0)
Compare | [026096b77a9dcfe0368a5d04d6fdc28efc3865d1](https://github.com/dotnet/runtime/commit/026096b77a9dcfe0368a5d04d6fdc28efc3865d1)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a4b2df0e43b45c9a5ecb638bf0bb92ebef9234f0...026096b77a9dcfe0368a5d04d6fdc28efc3865d1)
Configs | CompilationMode:wasm, RunKind:micro

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

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

• [Clear - 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<Int32>.Clear(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 linked regression report and the benchmark source at src/benchmarks/micro/libraries/System.Memory/Span.cs. Compare the baseline and test commits, reproduce the System.Memory.Span.Clear(Size: 512) benchmark with the provided benchmarks_ci.py command, and use the profiling workflow docs to investigate the 7% regression. Done means identifying and addressing the cause, then confirming the benchmark no longer regresses.

Written by the indexing model from the issue text.