[Perf] Linux/arm64: 1 Regression on 2/17/2026 1:19:01 AM -08:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [bf624940f0e1796d78f1b1817ffd8842e66727a4](https://github.com/dotnet/runtime/commit/bf624940f0e1796d78f1b1817ffd8842e66727a4)
Compare | [9268ae6c111dd586ff3514d988d17173c7899fa9](https://github.com/dotnet/runtime/commit/9268ae6c111dd586ff3514d988d17173c7899fa9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/bf624940f0e1796d78f1b1817ffd8842e66727a4...9268ae6c111dd586ff3514d988d17173c7899fa9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.MathBenchmarks.Double

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

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

| 42.52 μs | 53.74 μs | 1.26 | 0.34 | 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.MathBenchmarks.Double*'
```

### System.MathBenchmarks.Double.Atan

#### 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)