[Perf] Windows/x64: 8 Improvements on 3/22/2026 7:11:08 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f416dc4f97c836c6b91617e9c1857a752072b5e2](https://github.com/dotnet/runtime/commit/f416dc4f97c836c6b91617e9c1857a752072b5e2)
Compare | [f6d4ffd1dba9478b91d79371e77270d05e2d8a1d](https://github.com/dotnet/runtime/commit/f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f416dc4f97c836c6b91617e9c1857a752072b5e2...f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Numerics.Tests.Perf_VectorConvert

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

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

| 547.77 ns | 432.41 ns | 0.79 | 0.11 | False | | |
|

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

| 547.86 ns | 431.15 ns | 0.79 | 0.07 | False | | |
|

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

| 547.76 ns | 468.33 ns | 0.85 | 0.01 | False | | |
|

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

| 547.72 ns | 432.13 ns | 0.79 | 0.12 | False | | |
|

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

| 546.82 ns | 434.21 ns | 0.79 | 0.12 | False | | |
|

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

| 546.84 ns | 434.67 ns | 0.79 | 0.07 | False | | |
|

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

| 548.23 ns | 438.53 ns | 0.80 | 0.06 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![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_byte

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_VectorConvert.Widen_int

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_VectorConvert.Convert_float_int

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_VectorConvert.Widen_sbyte

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_VectorConvert.Widen_ushort

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### 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 | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f416dc4f97c836c6b91617e9c1857a752072b5e2](https://github.com/dotnet/runtime/commit/f416dc4f97c836c6b91617e9c1857a752072b5e2)
Compare | [f6d4ffd1dba9478b91d79371e77270d05e2d8a1d](https://github.com/dotnet/runtime/commit/f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f416dc4f97c836c6b91617e9c1857a752072b5e2...f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.ContainsTrueComparer<Int32>

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

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

| 3.36 μs | 1.58 μs | 0.47 | 0.01 | False | | |

![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.Collections.ContainsTrueComparer*'
```

### System.Collections.ContainsTrueComparer<Int32>.HashSet(Size: 512)

#### 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 dotnet/performance/src/benchmarks/micro/libraries/System.Numerics.Vectors/Perf_VectorConvert.cs, especially the referenced Widen and Convert_float_int lines. Run the provided benchmarks_ci.py command and compare the reported Windows/x64 results with the linked baseline and test reports. Done requires identifying and addressing the performance behavior across the listed benchmarks, then verifying the measurements.

Written by the indexing model from the issue text.