[Perf] Linux/arm64: 3 Regressions on 5/13/2026 7:58:13 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28](https://github.com/dotnet/runtime/commit/7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28)
Compare | [edcc3af021a650c3a9b0929946f1b608ce92ba42](https://github.com/dotnet/runtime/commit/edcc3af021a650c3a9b0929946f1b608ce92ba42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28...edcc3af021a650c3a9b0929946f1b608ce92ba42)
Configs | CompilationMode:tiered, RunKind:micro

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

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

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

| 43.85 μs | 70.88 μs | 1.62 | 0.24 | False | | |
|

• [Ieee754Remainder_Vector - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 42.77 μs | 55.47 μs | 1.30 | 0.32 | 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_FloatingPointTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_FloatingPointTensorPrimitives<Double>.Pow_ScalarBase(BufferLength: 3079)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_FloatingPointTensorPrimitives<Double>.Ieee754Remainder_Vector(BufferLength: 3079)

#### 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 | [7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28](https://github.com/dotnet/runtime/commit/7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28)
Compare | [edcc3af021a650c3a9b0929946f1b608ce92ba42](https://github.com/dotnet/runtime/commit/edcc3af021a650c3a9b0929946f1b608ce92ba42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7a71ac4aea5dbf9d60056cbab18ce84ab8cd9b28...edcc3af021a650c3a9b0929946f1b608ce92ba42)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Globalization.Tests.StringSearch

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

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

| 5.33 μs | 8.57 μs | 1.61 | 0.22 | 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.Globalization.Tests.StringSearch*'
```

### System.Globalization.Tests.StringSearch.IndexOf_Word_NotFound(Options: (en-US, None, True))

#### 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)