[Perf] Windows/x86: 2 Regressions on 2/5/2026 11:30:03 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0402dfab8379640fc944febe06a235640be65212](https://github.com/dotnet/runtime/commit/0402dfab8379640fc944febe06a235640be65212)
Compare | [76f6d85e7b9c2cb3122572b688c57932c481981f](https://github.com/dotnet/runtime/commit/76f6d85e7b9c2cb3122572b688c57932c481981f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0402dfab8379640fc944febe06a235640be65212...76f6d85e7b9c2cb3122572b688c57932c481981f)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Linq.Tests.Perf_Enumerable

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

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

| 338.42 ns | 407.66 ns | 1.20 | 0.24 | False | | |
|

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

| 353.76 ns | 388.96 ns | 1.10 | 0.35 | 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.Linq.Tests.Perf_Enumerable*'
```

### System.Linq.Tests.Perf_Enumerable.CastToSameType(input: IEnumerable)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.Max(input: IEnumerable)

#### 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)