[Perf] Windows/x86: 2 Regressions on 8/20/2026 5:39:27 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [7aac3c7ad953aaa23bad1d7867e7a0ec2c4a629c](https://github.com/dotnet/runtime/commit/7aac3c7ad953aaa23bad1d7867e7a0ec2c4a629c)
Compare | [be1c680101458a735200e68a74460919be249315](https://github.com/dotnet/runtime/commit/be1c680101458a735200e68a74460919be249315)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7aac3c7ad953aaa23bad1d7867e7a0ec2c4a629c...be1c680101458a735200e68a74460919be249315)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

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

| 316.59 ns | 353.22 ns | 1.12 | 0.06 | False | | |
|

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

| 319.54 ns | 351.14 ns | 1.10 | 0.08 | False | | |

![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.IsDefinedClassHit

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Reflection.Attributes.IsDefinedClassHitInherit

#### 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)

Start with the benchmark source at src/benchmarks/micro/runtime/System.Reflection/Attributes.cs lines 87-94 and compare the baseline and test commits linked in the report. Run the provided benchmarks_ci.py command, then consult the benchmarking and profiling workflow documents to investigate both regressions. Done means the regression is explained and any correction is validated against these benchmarks.

Written by the indexing model from the issue text.