[Perf] Linux/x64: 2 Regressions on 12/4/2025 6:28:59 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [32a02c7039aed473abc499c59916adccc2e1acde](https://github.com/dotnet/runtime/commit/32a02c7039aed473abc499c59916adccc2e1acde)
Compare | [ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf](https://github.com/dotnet/runtime/commit/ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/32a02c7039aed473abc499c59916adccc2e1acde...ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in PerfLabTests.CastingPerf2.CastingPerf

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

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

| 124.57 μs | 149.46 μs | 1.20 | 0.02 | 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 'PerfLabTests.CastingPerf2.CastingPerf*'
```

### PerfLabTests.CastingPerf2.CastingPerf.FooObjIsDescendant

#### 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 | [32a02c7039aed473abc499c59916adccc2e1acde](https://github.com/dotnet/runtime/commit/32a02c7039aed473abc499c59916adccc2e1acde)
Compare | [ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf](https://github.com/dotnet/runtime/commit/ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/32a02c7039aed473abc499c59916adccc2e1acde...ec8d8b75571cdd956c8d7a71b1a3b4e2087fc0bf)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Tests.Perf_Decimal

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

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

| 16.84 ns | 36.31 ns | 2.16 | 0.26 | 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.Tests.Perf_Decimal*'
```

### System.Tests.Perf_Decimal.Mod

#### 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)