[Perf] Linux/x64: 2 Regressions on 6/14/2026 8:16:58 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [3a87981877445b58ef3c05851888e24c3558876b](https://github.com/dotnet/runtime/commit/3a87981877445b58ef3c05851888e24c3558876b)
Compare | [39ace2debc428330d7d1b82480c698828ba23bb6](https://github.com/dotnet/runtime/commit/39ace2debc428330d7d1b82480c698828ba23bb6)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3a87981877445b58ef3c05851888e24c3558876b...39ace2debc428330d7d1b82480c698828ba23bb6)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_VectorOf<UInt32>

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

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

| 1.73 ns | 150.00 ns | 86.48 | 0.55 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_VectorOf*'
```

### System.Numerics.Tests.Perf_VectorOf<UInt32>.AndNotBenchmark

#### 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 | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [3a87981877445b58ef3c05851888e24c3558876b](https://github.com/dotnet/runtime/commit/3a87981877445b58ef3c05851888e24c3558876b)
Compare | [39ace2debc428330d7d1b82480c698828ba23bb6](https://github.com/dotnet/runtime/commit/39ace2debc428330d7d1b82480c698828ba23bb6)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3a87981877445b58ef3c05851888e24c3558876b...39ace2debc428330d7d1b82480c698828ba23bb6)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.IO.Tests.StringReaderReadToEndTests

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

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

| 42.08 ns | 45.71 ns | 1.09 | 0.07 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.StringReaderReadToEndTests*'
```

### System.IO.Tests.StringReaderReadToEndTests.ReadToEnd(LineLengthRange: [ 9, 32])

#### 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)