[Perf] Windows/x86: 1 Regression on 3/15/2026 2:23:53 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [28009ec2c631cbe4b321fb2648b7c3cd2e5fb8b0](https://github.com/dotnet/runtime/commit/28009ec2c631cbe4b321fb2648b7c3cd2e5fb8b0)
Compare | [da46c687a0f3112cf035b6eef5273e4612482e9f](https://github.com/dotnet/runtime/commit/da46c687a0f3112cf035b6eef5273e4612482e9f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/28009ec2c631cbe4b321fb2648b7c3cd2e5fb8b0...da46c687a0f3112cf035b6eef5273e4612482e9f)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.ContainsFalse<Int32>

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

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

| 9.48 μs | 12.99 μs | 1.37 | 0.14 | 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.Collections.ContainsFalse*'
```

### System.Collections.ContainsFalse<Int32>.Span(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)