dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x64: 13 Regressions on 4/10/2026 6:15:26 AM +00:00

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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [05b2bbc014e75b63664a6d14449c61f642e69c98](https://github.com/dotnet/runtime/commit/05b2bbc014e75b63664a6d14449c61f642e69c98)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/05b2bbc014e75b63664a6d14449c61f642e69c98...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Memory.Span<Int32>

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

  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.42 ns | 35.44 ns | 1.92 | 0.34 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.45 ns | 16.14 ns | 1.20 | 0.14 | False | | |
|
  • [IndexOfAnyFourValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 22.91 ns | 26.02 ns | 1.14 | 0.25 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.78 ns | 30.07 ns | 1.08 | 0.10 | 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.Memory.Span*'
```

### System.Memory.Span<Int32>.Reverse(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.StartsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFourValues(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 33)

#### 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 | [05b2bbc014e75b63664a6d14449c61f642e69c98](https://github.com/dotnet/runtime/commit/05b2bbc014e75b63664a6d14449c61f642e69c98)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/05b2bbc014e75b63664a6d14449c61f642e69c98...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

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

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

  • [Max_Scalar - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.46 ns | 15.45 ns | 2.07 | 0.34 | False | | |
|
  • [Add_Scalar - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.81 ns | 15.45 ns | 1.98 | 0.37 | False | | |
|
  • [Max_Vector - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.14 ns | 18.04 ns | 1.28 | 0.30 | 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>.Max_Scalar(BufferLength: 128)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Int32>.Add_Scalar(BufferLength: 128)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Int32>.Max_Vector(BufferLength: 128)

#### 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 | [1c60926108333917b419fd5489fb6d2070317222](https://github.com/dotnet/runtime/commit/1c60926108333917b419fd5489fb6d2070317222)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1c60926108333917b419fd5489fb6d2070317222...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Memory.Span<Char>

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

  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.90 ns | 8.99 ns | 1.30 | 0.30 | False | | |
|
  • [SequenceEqual - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.41 ns | 16.33 ns | 1.13 | 0.19 | 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.Memory.Span*'
```

### System.Memory.Span<Char>.StartsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Char>.SequenceEqual(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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [05b2bbc014e75b63664a6d14449c61f642e69c98](https://github.com/dotnet/runtime/commit/05b2bbc014e75b63664a6d14449c61f642e69c98)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/05b2bbc014e75b63664a6d14449c61f642e69c98...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>

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

  • [Max_Scalar - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.41 ns | 15.71 ns | 1.87 | 0.38 | False | | |
|
  • [Add_Vector - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.21 ns | 16.63 ns | 1.17 | 0.27 | 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<Single>.Max_Scalar(BufferLength: 128)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.Add_Vector(BufferLength: 128)

#### 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 | [05b2bbc014e75b63664a6d14449c61f642e69c98](https://github.com/dotnet/runtime/commit/05b2bbc014e75b63664a6d14449c61f642e69c98)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/05b2bbc014e75b63664a6d14449c61f642e69c98...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_BigInteger

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

  • [Equals - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.74 ns | 6.04 ns | 1.27 | 0.16 | 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.Tests.Perf_BigInteger*'
```

### System.Numerics.Tests.Perf_BigInteger.Equals(arguments: 259 bytes, DiffLastByte)

#### 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 | [ab2f538fca8e2d278e592da1dd6e6ad82954e91c](https://github.com/dotnet/runtime/commit/ab2f538fca8e2d278e592da1dd6e6ad82954e91c)
Compare | [6adf63be6db59b3f9a376715baf96ef7a545181d](https://github.com/dotnet/runtime/commit/6adf63be6db59b3f9a376715baf96ef7a545181d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ab2f538fca8e2d278e592da1dd6e6ad82954e91c...6adf63be6db59b3f9a376715baf96ef7a545181d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tensors.Tests.Perf_FloatingPointTensorPrimitives<Single>

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

  • [Round - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.45 ns | 15.69 ns | 2.10 | 0.35 | 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_FloatingPointTensorPrimitives*'
```

### System.Numerics.Tensors.Tests.Perf_FloatingPointTensorPrimitives<Single>.Round(BufferLength: 128)

#### 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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start by running the provided benchmarks_ci.py command and reviewing the linked System.Memory Span.cs and Perf_NumberTensorPrimitives.cs benchmark sources. Compare the reported baseline and test results, then trace the runtime change range linked in the issue. Done means the regressions are explained and the affected benchmarks return to the expected performance level.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
performance, testing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
30/100

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