[Perf] Linux/x64: 1 Regression on 7/28/2026 8:32:51 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [4d07108c0125e4741bda596f27740118c0fe3833](https://github.com/dotnet/runtime/commit/4d07108c0125e4741bda596f27740118c0fe3833)
Compare | [00fc09ea5b2e39c46d56fda130b6693e07d449d8](https://github.com/dotnet/runtime/commit/00fc09ea5b2e39c46d56fda130b6693e07d449d8)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4d07108c0125e4741bda596f27740118c0fe3833...00fc09ea5b2e39c46d56fda130b6693e07d449d8)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_Uri

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

• [UnescapeDataString - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config 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 'System.Tests.Perf_Uri*'
```

### System.Tests.Perf_Uri.UnescapeDataString(input: "%E4%BD%A0%E5%A5%BD")

#### 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)

Start with the linked System.Tests.Perf_Uri benchmark and its source in dotnet/performance/src/benchmarks/micro/libraries/System.Runtime/Perf.Uri.cs. Run the provided benchmarks_ci.py command, compare the baseline and test commits, and use the report links to identify the cause; done means the UnescapeDataString regression is explained and resolved.

Written by the indexing model from the issue text.