[Perf] Linux/x64: 1 Regression on 6/16/2026 6:17:36 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [98d5787a726f050c592e7c126c6ab62b1954288c](https://github.com/dotnet/runtime/commit/98d5787a726f050c592e7c126c6ab62b1954288c)
Compare | [4b211ba77ff3bfa4b7d2ba0c873e6bd337b6c6f0](https://github.com/dotnet/runtime/commit/4b211ba77ff3bfa4b7d2ba0c873e6bd337b6c6f0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/98d5787a726f050c592e7c126c6ab62b1954288c...4b211ba77ff3bfa4b7d2ba0c873e6bd337b6c6f0)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_Int16

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

• [CopySign - Duration of single invocation]()
• [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_Int16*'
```

### System.Tests.Perf_Int16.CopySign(value: 1, sign: -1)

#### 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 System.Tests.Perf_Int16.CopySign benchmark, the linked test report, and the baseline/compare commits. Run the documented benchmarks_ci.py command for System.Tests.Perf_Int16, then compare the results and investigate the reported 13% regression; done means the regression is explained and addressed or confirmed.

Written by the indexing model from the issue text.