[Perf] Windows/x86: 2 Regressions on 5/28/2026 9:11:34 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [87494fa4b24e277aa7cbb927f032ecebe4fbde21](https://github.com/dotnet/runtime/commit/87494fa4b24e277aa7cbb927f032ecebe4fbde21)
Compare | [760c770a3c5427b1811a978f1252e2ed2bc9d110](https://github.com/dotnet/runtime/commit/760c770a3c5427b1811a978f1252e2ed2bc9d110)
Diff | [Diff](https://github.com/dotnet/runtime/compare/87494fa4b24e277aa7cbb927f032ecebe4fbde21...760c770a3c5427b1811a978f1252e2ed2bc9d110)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_VectorConvert

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

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

| 426.97 ns | 548.12 ns | 1.28 | 0.11 | False | | |
|

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

| 434.05 ns | 548.17 ns | 1.26 | 0.10 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_VectorConvert*'
```

### System.Numerics.Tests.Perf_VectorConvert.Widen_uint

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_VectorConvert.Widen_short

#### 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)