[Perf] Windows/x64: 4 Regressions on 6/5/2026 2:49:34 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4c16f5f5f54b01319ff2a276f1a10e635402c3ca](https://github.com/dotnet/runtime/commit/4c16f5f5f54b01319ff2a276f1a10e635402c3ca)
Compare | [ecaa1c589257cd25a5034dffba8e2a8fea10470a](https://github.com/dotnet/runtime/commit/ecaa1c589257cd25a5034dffba8e2a8fea10470a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4c16f5f5f54b01319ff2a276f1a10e635402c3ca...ecaa1c589257cd25a5034dffba8e2a8fea10470a)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Reflection.Attributes

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

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

| 61.04 ns | 81.00 ns | 1.33 | 0.26 | False | | |
|

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

| 70.70 ns | 91.26 ns | 1.29 | 0.27 | False | | |
|

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

| 154.12 ns | 195.12 ns | 1.27 | 0.40 | False | | |
|

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

| 93.73 ns | 102.66 ns | 1.10 | 0.42 | False | | |

![graph]()
![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.Reflection.Attributes*'
```

### System.Reflection.Attributes.IsDefinedMethodBaseMiss

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Reflection.Attributes.IsDefinedMethodBaseMissInherit

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Reflection.Attributes.GetCustomAttributesClassMissInherit

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Reflection.Attributes.GetCustomAttributesMethodBaseMiss

#### 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)