[Perf] Linux/arm64: 5 Regressions on 5/12/2026 11:35:36 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [6820c801e8b84f3fc9f96ecb6e0838b829345951](https://github.com/dotnet/runtime/commit/6820c801e8b84f3fc9f96ecb6e0838b829345951)
Compare | [52090b9f07a14ec5db3a19b379548f469fefcc27](https://github.com/dotnet/runtime/commit/52090b9f07a14ec5db3a19b379548f469fefcc27)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6820c801e8b84f3fc9f96ecb6e0838b829345951...52090b9f07a14ec5db3a19b379548f469fefcc27)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>

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

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

| 5.12 μs | 7.34 μs | 1.44 | 0.04 | False | | |
|

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

| 217.01 ns | 302.16 ns | 1.39 | 0.12 | 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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 3079)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 128)

#### 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 | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [6820c801e8b84f3fc9f96ecb6e0838b829345951](https://github.com/dotnet/runtime/commit/6820c801e8b84f3fc9f96ecb6e0838b829345951)
Compare | [52090b9f07a14ec5db3a19b379548f469fefcc27](https://github.com/dotnet/runtime/commit/52090b9f07a14ec5db3a19b379548f469fefcc27)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6820c801e8b84f3fc9f96ecb6e0838b829345951...52090b9f07a14ec5db3a19b379548f469fefcc27)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>

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

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

| 2.55 μs | 3.67 μs | 1.44 | 0.09 | False | | |
|

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

| 111.29 ns | 147.55 ns | 1.33 | 0.04 | 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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 3079)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 128)

#### 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 | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [6820c801e8b84f3fc9f96ecb6e0838b829345951](https://github.com/dotnet/runtime/commit/6820c801e8b84f3fc9f96ecb6e0838b829345951)
Compare | [52090b9f07a14ec5db3a19b379548f469fefcc27](https://github.com/dotnet/runtime/commit/52090b9f07a14ec5db3a19b379548f469fefcc27)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6820c801e8b84f3fc9f96ecb6e0838b829345951...52090b9f07a14ec5db3a19b379548f469fefcc27)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.IO.Hashing.Tests.Crc32_AppendPerf

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

• [Append - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 32.90 ns | 37.49 ns | 1.14 | 0.11 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Hashing.Tests.Crc32_AppendPerf*'
```

### System.IO.Hashing.Tests.Crc32_AppendPerf.Append(BufferSize: 128)

#### 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)