[Perf] Windows/x86: 1 Regression on 8/7/2026 11:43:54 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [45fb46d810550207fe12a2b02dabec25f47c71ad](https://github.com/dotnet/runtime/commit/45fb46d810550207fe12a2b02dabec25f47c71ad)
Compare | [a94502c975d011f1a3a4da9755f10fff1a57391d](https://github.com/dotnet/runtime/commit/a94502c975d011f1a3a4da9755f10fff1a57391d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/45fb46d810550207fe12a2b02dabec25f47c71ad...a94502c975d011f1a3a4da9755f10fff1a57391d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in LinqBenchmarks

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

• [Where00LinqMethodX - 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 'LinqBenchmarks*'
```

### LinqBenchmarks.Where00LinqMethodX

#### 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 in dotnet/performance/src/benchmarks/micro/runtime/Linq/Linq.cs, especially Where00LinqMethodX, and read the linked benchmarking and profiling workflow docs. Reproduce it with the provided benchmarks_ci.py command, then compare the reported baseline and test results to identify and validate the regression. Done means the benchmark no longer shows the reported slowdown on the specified Windows/x86 configuration.

Written by the indexing model from the issue text.