[Perf] Windows/x86: 1 Regression on 4/16/2026 4:01:20 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [75d3e60ff9f43456812d313c22737e13eb1de6ef](https://github.com/dotnet/runtime/commit/75d3e60ff9f43456812d313c22737e13eb1de6ef)
Compare | [337094ae3bc0f01c100078a84c97e8b35c8f714b](https://github.com/dotnet/runtime/commit/337094ae3bc0f01c100078a84c97e8b35c8f714b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/75d3e60ff9f43456812d313c22737e13eb1de6ef...337094ae3bc0f01c100078a84c97e8b35c8f714b)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.Perf_FileStream

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

• [ReadAsync_NoBuffering - 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: None)

#### 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)