[Perf] Windows/x64: 2 Improvements on 8/7/2026 11:43:54 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [45fb46d810550207fe12a2b02dabec25f47c71ad](https://github.com/dotnet/runtime/commit/45fb46d810550207fe12a2b02dabec25f47c71ad)
Compare | [a94502c975d011f1a3a4da9755f10fff1a57391d](https://github.com/dotnet/runtime/commit/a94502c975d011f1a3a4da9755f10fff1a57391d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/45fb46d810550207fe12a2b02dabec25f47c71ad...a94502c975d011f1a3a4da9755f10fff1a57391d)
Configs | CompilationMode:tiered, RunKind:micro

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

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

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

| 39.33 ns | 27.47 ns | 0.70 | 0.25 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span*'
```

### System.Memory.Span<Char>.IndexOfValue(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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [45fb46d810550207fe12a2b02dabec25f47c71ad](https://github.com/dotnet/runtime/commit/45fb46d810550207fe12a2b02dabec25f47c71ad)
Compare | [a94502c975d011f1a3a4da9755f10fff1a57391d](https://github.com/dotnet/runtime/commit/a94502c975d011f1a3a4da9755f10fff1a57391d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/45fb46d810550207fe12a2b02dabec25f47c71ad...a94502c975d011f1a3a4da9755f10fff1a57391d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Linq.Tests.Perf_ImmutableArrayExtensions

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

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

| 10.49 ns | 9.02 ns | 0.86 | 0.29 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Linq.Tests.Perf_ImmutableArrayExtensions*'
```

### System.Linq.Tests.Perf_ImmutableArrayExtensions.SequenceEqual(input: Array)

#### 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 at src/benchmarks/micro/libraries/System.Memory/Span.cs#L88-L89 and src/benchmarks/micro/libraries/System.Linq/Perf.ImmutableArrayExtensions.cs#L29-L32. Run the supplied benchmarks_ci.py commands and compare the reported Windows/x64 results with the linked baseline and comparison commits. The issue does not specify a code change, so completion requires confirming the improvements and establishing a concrete follow-up.

Written by the indexing model from the issue text.