[Perf] Windows/x64: 1 Improvement on 8/3/2026 11:34:31 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [1110e1e923579c970199ab8a5a3482d48987d925](https://github.com/dotnet/runtime/commit/1110e1e923579c970199ab8a5a3482d48987d925)
Compare | [efb85c9570c78809ef53978a7efc820614e26a73](https://github.com/dotnet/runtime/commit/efb85c9570c78809ef53978a7efc820614e26a73)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1110e1e923579c970199ab8a5a3482d48987d925...efb85c9570c78809ef53978a7efc820614e26a73)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Numerics.Tests.Perf_BitOperations

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

• [TrailingZeroCount_ulong - 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_BitOperations*'
```

### System.Numerics.Tests.Perf_BitOperations.TrailingZeroCount_ulong

#### 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 src/benchmarks/micro/libraries/System.Numerics.BitOperations/Perf_BitOperations.cs, especially the TrailingZeroCount_ulong benchmark, and run the provided benchmarks_ci.py command with its filter. Compare the baseline and test commits and inspect the linked report; done requires identifying and validating an actionable runtime performance change, which the issue does not currently specify.

Written by the indexing model from the issue text.