[Perf] Windows/x86: 1 Improvement on 3/22/2026 7:11:08 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [df182629204a1f4cbe8a64c4ff4fa29dc8377991](https://github.com/dotnet/runtime/commit/df182629204a1f4cbe8a64c4ff4fa29dc8377991)
Compare | [f6d4ffd1dba9478b91d79371e77270d05e2d8a1d](https://github.com/dotnet/runtime/commit/f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/df182629204a1f4cbe8a64c4ff4fa29dc8377991...f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

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

| 461.44 ns | 420.12 ns | 0.91 | 0.34 | False | | |

[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>.IndexOfAnyFiveValues(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 90-91 and reproduce System.Memory.Span with the provided benchmarks_ci.py command. Compare the linked baseline and test reports, then determine a concrete change that preserves IndexOfAnyFiveValues behavior while addressing the measured result; completion criteria are not specified in the issue.

Written by the indexing model from the issue text.