[Perf] Linux/x64: 1 Improvement on 8/10/2026 5:40:28 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [9904b9343c89c898fea3a9dfa68a6aba7fa8f3c1](https://github.com/dotnet/runtime/commit/9904b9343c89c898fea3a9dfa68a6aba7fa8f3c1)
Compare | [ab094c18ba7f4a96d145afd8b34f965c5c3ef31d](https://github.com/dotnet/runtime/commit/ab094c18ba7f4a96d145afd8b34f965c5c3ef31d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/9904b9343c89c898fea3a9dfa68a6aba7fa8f3c1...ab094c18ba7f4a96d145afd8b34f965c5c3ef31d)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Improvements in System.Runtime.Intrinsics.Tests.Perf_Vector128

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

• [ConvertDoubleToULongBenchmark - 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_Vector128*'
```

### System.Runtime.Intrinsics.Tests.Perf_Vector128.ConvertDoubleToULongBenchmark

#### 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 benchmark source in performance/src/benchmarks/micro/libraries/System.Runtime.Intrinsics/Perf_Vector128.cs at lines 54-55, then read the benchmarking workflow documentation and reproduce the System.Runtime.Intrinsics.Tests.Perf_Vector128 run. Compare the baseline and test results for ConvertDoubleToULongBenchmark and determine whether the reported improvement is expected; done means the performance change is explained and any needed follow-up is identified.

Written by the indexing model from the issue text.