[Perf] Linux/x64: 1 Regression on 6/14/2026 5:53:19 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a1e8100c55b9b8e2bacb3c8e97770e2e1a739359](https://github.com/dotnet/runtime/commit/a1e8100c55b9b8e2bacb3c8e97770e2e1a739359)
Compare | [98bfa17c9f3910eec30099b7ac140d8a09df6227](https://github.com/dotnet/runtime/commit/98bfa17c9f3910eec30099b7ac140d8a09df6227)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a1e8100c55b9b8e2bacb3c8e97770e2e1a739359...98bfa17c9f3910eec30099b7ac140d8a09df6227)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Runtime.Intrinsics.Tests.Perf_Vector128Float

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

• [UnaryNegateOperatorBenchmark - 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.Runtime.Intrinsics.Tests.Perf_Vector128Float*'
```

### System.Runtime.Intrinsics.Tests.Perf_Vector128Float.UnaryNegateOperatorBenchmark

#### 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 benchmark source at src/benchmarks/micro/libraries/System.Runtime.Intrinsics/Perf_Vector128.cs#L110-L111, then run the provided benchmarks_ci.py command with the System.Runtime.Intrinsics.Tests.Perf_Vector128Float filter. Compare the linked baseline and test commits, report, and history graph to determine why UnaryNegateOperatorBenchmark changed from 37.50 ns to 200.00 ns; done means the regression is explained and addressed or documented.

Written by the indexing model from the issue text.