[Perf] Linux/arm64: 1 Regression on 7/22/2026 1:13:11 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [17c839c4055469e3e8dc3e47a76b47e417b63af9](https://github.com/dotnet/runtime/commit/17c839c4055469e3e8dc3e47a76b47e417b63af9)
Compare | [97e5cfb1cb0abe25865e96267845e44a75a6f5b7](https://github.com/dotnet/runtime/commit/97e5cfb1cb0abe25865e96267845e44a75a6f5b7)
Diff | [Diff](https://github.com/dotnet/runtime/compare/17c839c4055469e3e8dc3e47a76b47e417b63af9...97e5cfb1cb0abe25865e96267845e44a75a6f5b7)
Configs | CompilationMode:tiered, RunKind:micro

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

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

• [GetUInt64 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 515.67 ns | 899.09 ns | 1.74 | 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 'System.Text.Json.Tests.Perf_Get*'
```

### System.Text.Json.Tests.Perf_Get.GetUInt64

#### 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)