[Perf] Linux/x64: 2 Regressions on 7/11/2026 6:08:51 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [7db43828cc273aa164f2247744a43f70555f780f](https://github.com/dotnet/runtime/commit/7db43828cc273aa164f2247744a43f70555f780f)
Compare | [a7ed27ba3f7a0a32634be47079ac659909797806](https://github.com/dotnet/runtime/commit/a7ed27ba3f7a0a32634be47079ac659909797806)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7db43828cc273aa164f2247744a43f70555f780f...a7ed27ba3f7a0a32634be47079ac659909797806)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in GuardedDevirtualization.TwoClassInterface

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

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

| 44.65 ns | 56.45 ns | 1.26 | 0.26 | False | | |
|

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

| 48.31 ns | 57.04 ns | 1.18 | 0.24 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'GuardedDevirtualization.TwoClassInterface*'
```

### GuardedDevirtualization.TwoClassInterface.Call(testInput: pB = 0.50)

#### ETL Files

#### Histogram

#### JIT Disasms

### GuardedDevirtualization.TwoClassInterface.Call(testInput: pB = 0.60)

#### 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 GuardedDevirtualization.TwoClassInterface benchmark source at src/benchmarks/micro/runtime/Devirtualization/GuardedTwoClassInterface.cs and reproduce it using the documented benchmarks_ci.py command. Compare the supplied baseline and test reports, then use the profiling and benchmarking workflow docs to investigate the regression. Done means the reported performance regression is explained and addressed, with the benchmark no longer showing the slowdown.

Written by the indexing model from the issue text.