[Perf] Linux/x64: 2 Regressions on 5/25/2026 9:28:02 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [d198593b0563cd5364893144acddd454545df392](https://github.com/dotnet/runtime/commit/d198593b0563cd5364893144acddd454545df392)
Compare | [7f58900c3cf86d52fdd70bc95d697ab50ab7475a](https://github.com/dotnet/runtime/commit/7f58900c3cf86d52fdd70bc95d697ab50ab7475a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d198593b0563cd5364893144acddd454545df392...7f58900c3cf86d52fdd70bc95d697ab50ab7475a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int32>

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

• [LessThanBenchmark - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.70 ns | 150.00 ns | 55.48 | 0.39 | False | | |
|

• [BitwiseAndOperatorBenchmark - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.56 ns | 4.79 ns | 1.87 | 0.53 | False | | |

![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_Vector128Of*'
```

### System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int32>.LessThanBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int32>.BitwiseAndOperatorBenchmark

#### 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, src/benchmarks/micro/libraries/System.Runtime.Intrinsics/Perf_Vector128OfT.cs at lines 46-47 and 127-128, then run the provided benchmarks_ci.py command for the Vector128 filter. Compare the reported LessThanBenchmark and BitwiseAndOperatorBenchmark results with the linked baseline and test reports; done means the regression is explained and addressed with benchmark evidence.

Written by the indexing model from the issue text.