[Perf] Windows/x86: 3 Regressions on 4/26/2026 4:28:59 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [ad1912bde052d02d1fb75633a23dc4a313a3b7d0](https://github.com/dotnet/runtime/commit/ad1912bde052d02d1fb75633a23dc4a313a3b7d0)
Compare | [aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a](https://github.com/dotnet/runtime/commit/aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ad1912bde052d02d1fb75633a23dc4a313a3b7d0...aba46e33ea5ddd45d90e5c6a8b46bba6744ddc9a)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.StreamReaderReadLineTests

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

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

| 224.44 μs | 246.53 μs | 1.10 | 0.07 | False | | |
|

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

| 190.71 μs | 208.76 μs | 1.09 | 0.05 | False | | |
|

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

| 10.85 μs | 11.59 μs | 1.07 | 0.03 | False | | |

![graph]()
![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.StreamReaderReadLineTests*'
```

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 0, 0])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 1, 1])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 33, 128])

#### 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)