[Perf] Linux/x64: 4 Regressions on 4/21/2026 4:43:45 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [976701907bacb8447df45a1dd1fc089ec12e838f](https://github.com/dotnet/runtime/commit/976701907bacb8447df45a1dd1fc089ec12e838f)
Compare | [6f2ad2d6d76430b0f7c5bddabb64d9957092453a](https://github.com/dotnet/runtime/commit/6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/976701907bacb8447df45a1dd1fc089ec12e838f...6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in GuardedDevirtualization.ThreeClassInterface

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]()

| 3.82 ns | 4.96 ns | 1.30 | 0.11 | False | | |
|

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

| 3.93 ns | 4.95 ns | 1.26 | 0.11 | 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.ThreeClassInterface*'
```

### GuardedDevirtualization.ThreeClassInterface.Call(testInput: pB=0.67 pD=0.33)

#### ETL Files

#### Histogram

#### JIT Disasms

### GuardedDevirtualization.ThreeClassInterface.Call(testInput: pB=0.33 pD=0.67)

#### 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 | [976701907bacb8447df45a1dd1fc089ec12e838f](https://github.com/dotnet/runtime/commit/976701907bacb8447df45a1dd1fc089ec12e838f)
Compare | [6f2ad2d6d76430b0f7c5bddabb64d9957092453a](https://github.com/dotnet/runtime/commit/6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/976701907bacb8447df45a1dd1fc089ec12e838f...6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Collections.ContainsTrue<Int32>

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

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

| 293.46 μs | 332.07 μs | 1.13 | 0.09 | 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.Collections.ContainsTrue*'
```

### System.Collections.ContainsTrue<Int32>.LinkedList(Size: 512)

#### 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 | [976701907bacb8447df45a1dd1fc089ec12e838f](https://github.com/dotnet/runtime/commit/976701907bacb8447df45a1dd1fc089ec12e838f)
Compare | [6f2ad2d6d76430b0f7c5bddabb64d9957092453a](https://github.com/dotnet/runtime/commit/6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/976701907bacb8447df45a1dd1fc089ec12e838f...6f2ad2d6d76430b0f7c5bddabb64d9957092453a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Text.Json.Tests.Perf_Depth

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

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

| 125.56 ns | 146.88 ns | 1.17 | 0.17 | 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.Text.Json.Tests.Perf_Depth*'
```

### System.Text.Json.Tests.Perf_Depth.ReadSpanEmptyLoop(Depth: 1)

#### 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)