[Perf] Linux/x64: 1 Improvement on 9/10/2026 4:07:17 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e](https://github.com/dotnet/runtime/commit/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e)
Compare | [83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a](https://github.com/dotnet/runtime/commit/83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e...83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Improvements in System.Linq.Tests.Perf_Enumerable

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

• [TakeLastHalf - 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.Linq.Tests.Perf_Enumerable*'
```

### System.Linq.Tests.Perf_Enumerable.TakeLastHalf(input: List)

#### 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.Linq/Perf.Enumerable.cs#L214-L216, then run the documented benchmarks_ci.py command for System.Linq.Tests.Perf_Enumerable. Review the linked TakeLastHalf report and compare the baseline and test results; the issue does not define a code change or a completion condition.

Written by the indexing model from the issue text.