[Perf] Windows/x86: 2 Improvements on 2/28/2026 3:14:25 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63...1c94b86de4d8dd06420902131844566d0aa84342)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Int32>

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

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

| 601.46 ns | 503.34 ns | 0.84 | 0.23 | False | | |

[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.Tensors.Tests.Perf_NumberTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Int32>.MaxMagnitude_Vector(BufferLength: 3079)

#### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [de761a5e0a7bd363b5eb119260acfc8da4e9608c](https://github.com/dotnet/runtime/commit/de761a5e0a7bd363b5eb119260acfc8da4e9608c)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/de761a5e0a7bd363b5eb119260acfc8da4e9608c...1c94b86de4d8dd06420902131844566d0aa84342)
Configs | CompilationMode:tiered, RunKind:micro

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

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

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

| 232.38 ns | 192.14 ns | 0.83 | 0.23 | False | | |

[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.Linq.Tests.Perf_Enumerable*'
```

### System.Linq.Tests.Perf_Enumerable.SelectToArray(input: Array)

#### 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)

The reported benchmarks are in src/benchmarks/micro/libraries/System.Numerics.Tensors/Perf_NumberTensorPrimitives.cs and src/benchmarks/micro/libraries/System.Linq/Perf.Enumerable.cs. Start by running the provided benchmarks_ci.py commands and reviewing the linked test reports for the x86 Windows improvements. Done means determining whether the results are reproducible and what follow-up, if any, is needed.

Written by the indexing model from the issue text.