dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 13 Improvements on 2/5/2026 9:06:10 PM +00:00

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arch-x86 branch-refs/heads/main kind-micro os-windows perf-improvement PGO runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f6b4b6ce93a8dce234a93e461060c648865dae3f](https://github.com/dotnet/runtime/commit/f6b4b6ce93a8dce234a93e461060c648865dae3f)
Compare | [a1bbba5d0ad98e82596ac3469e4534ae7966ed6f](https://github.com/dotnet/runtime/commit/a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f6b4b6ce93a8dce234a93e461060c648865dae3f...a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in PerfLabTests.LowLevelPerf

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

  • [InstanceDelegate - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 189.63 μs | 162.56 μs | 0.86 | 0.08 | False | | |
|
  • [ClassVirtualMethod - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 162.25 μs | 135.48 μs | 0.84 | 0.06 | 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 'PerfLabTests.LowLevelPerf*'
```

### PerfLabTests.LowLevelPerf.InstanceDelegate

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.LowLevelPerf.ClassVirtualMethod

#### 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 | [f6b4b6ce93a8dce234a93e461060c648865dae3f](https://github.com/dotnet/runtime/commit/f6b4b6ce93a8dce234a93e461060c648865dae3f)
Compare | [a1bbba5d0ad98e82596ac3469e4534ae7966ed6f](https://github.com/dotnet/runtime/commit/a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f6b4b6ce93a8dce234a93e461060c648865dae3f...a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.TryGetValueFalse<BigStruct, BigStruct>

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

  • [SortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 43.35 μs | 37.19 μs | 0.86 | 0.13 | 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.Collections.TryGetValueFalse*'
```

### System.Collections.TryGetValueFalse<BigStruct, BigStruct>.SortedDictionary(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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f6b4b6ce93a8dce234a93e461060c648865dae3f](https://github.com/dotnet/runtime/commit/f6b4b6ce93a8dce234a93e461060c648865dae3f)
Compare | [a1bbba5d0ad98e82596ac3469e4534ae7966ed6f](https://github.com/dotnet/runtime/commit/a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f6b4b6ce93a8dce234a93e461060c648865dae3f...a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.Encodings.Web.Tests.Perf_Encoders

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

  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 61.20 ns | 50.65 ns | 0.83 | 0.03 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 52.50 ns | 46.44 ns | 0.88 | 0.04 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 42.83 ns | 35.49 ns | 0.83 | 0.06 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 72.41 ns | 66.57 ns | 0.92 | 0.07 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 37.70 ns | 34.65 ns | 0.92 | 0.03 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 33.01 ns | 23.53 ns | 0.71 | 0.06 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 37.84 ns | 35.11 ns | 0.93 | 0.06 | 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.Text.Encodings.Web.Tests.Perf_Encoders*'
```

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: Url,&lorem ipsum=dolor sit amet,16)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: JavaScript,&Hello+<World>!,512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: JavaScript,&Hello+<World>!,16)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: Url,&lorem ipsum=dolor sit amet,512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: UnsafeRelaxed,hello "there",512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: UnsafeRelaxed,hello "there",16)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: Url,�2020,16)

#### 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 | [f6b4b6ce93a8dce234a93e461060c648865dae3f](https://github.com/dotnet/runtime/commit/f6b4b6ce93a8dce234a93e461060c648865dae3f)
Compare | [a1bbba5d0ad98e82596ac3469e4534ae7966ed6f](https://github.com/dotnet/runtime/commit/a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f6b4b6ce93a8dce234a93e461060c648865dae3f...a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.RegularExpressions.Tests.Perf_Regex_Common

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

  • [CtorInvoke - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 235.06 μs | 194.21 μs | 0.83 | 0.01 | False | | |
|
  • [CtorInvoke - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 219.55 μs | 179.36 μs | 0.82 | 0.01 | 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.Text.RegularExpressions.Tests.Perf_Regex_Common*'
```

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.CtorInvoke(Options: IgnoreCase, Compiled)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.CtorInvoke(Options: Compiled)

#### 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 | [f6b4b6ce93a8dce234a93e461060c648865dae3f](https://github.com/dotnet/runtime/commit/f6b4b6ce93a8dce234a93e461060c648865dae3f)
Compare | [a1bbba5d0ad98e82596ac3469e4534ae7966ed6f](https://github.com/dotnet/runtime/commit/a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f6b4b6ce93a8dce234a93e461060c648865dae3f...a1bbba5d0ad98e82596ac3469e4534ae7966ed6f)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.TryGetValueTrue<BigStruct, BigStruct>

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

  • [SortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 38.09 μs | 34.17 μs | 0.90 | 0.14 | 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.Collections.TryGetValueTrue*'
```

### System.Collections.TryGetValueTrue<BigStruct, BigStruct>.SortedDictionary(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)

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