dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 9 Regressions on 3/22/2026 7:11:08 AM +00:00

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

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [df182629204a1f4cbe8a64c4ff4fa29dc8377991](https://github.com/dotnet/runtime/commit/df182629204a1f4cbe8a64c4ff4fa29dc8377991)
Compare | [f6d4ffd1dba9478b91d79371e77270d05e2d8a1d](https://github.com/dotnet/runtime/commit/f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/df182629204a1f4cbe8a64c4ff4fa29dc8377991...f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
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_byte - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 429.22 ns | 548.01 ns | 1.28 | 0.22 | False | | |
|
  • [Widen_int - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 433.34 ns | 547.99 ns | 1.26 | 0.20 | False | | |
|
  • [Widen_sbyte - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 432.37 ns | 547.94 ns | 1.27 | 0.21 | False | | |
|
  • [Widen_short - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 432.59 ns | 548.01 ns | 1.27 | 0.21 | False | | |
|
  • [Widen_ushort - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 432.94 ns | 548.14 ns | 1.27 | 0.19 | False | | |
|
  • [Widen_uint - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 428.48 ns | 547.99 ns | 1.28 | 0.20 | False | | |
|
  • [Convert_double_long - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 474.30 ns | 547.98 ns | 1.16 | 0.19 | False | | |

![graph]()
![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.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

### System.Numerics.Tests.Perf_VectorConvert.Convert_double_long

#### 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 | [df182629204a1f4cbe8a64c4ff4fa29dc8377991](https://github.com/dotnet/runtime/commit/df182629204a1f4cbe8a64c4ff4fa29dc8377991)
Compare | [f6d4ffd1dba9478b91d79371e77270d05e2d8a1d](https://github.com/dotnet/runtime/commit/f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/df182629204a1f4cbe8a64c4ff4fa29dc8377991...f6d4ffd1dba9478b91d79371e77270d05e2d8a1d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in IfStatements.IfStatements

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

  • [OrOr - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 33.69 μs | 36.06 μs | 1.07 | 0.15 | False | | |
|
  • [SingleArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 24.39 μs | 27.10 μs | 1.11 | 0.21 | 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 'IfStatements.IfStatements*'
```

### IfStatements.IfStatements.OrOr

#### ETL Files

#### Histogram

#### JIT Disasms

### IfStatements.IfStatements.SingleArray

#### 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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