dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 8 Improvements on 7/8/2026 10:47:18 PM +00:00

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

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f9a6e2ef41c17130866d7036c5f0cde47e8854af](https://github.com/dotnet/runtime/commit/f9a6e2ef41c17130866d7036c5f0cde47e8854af)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f9a6e2ef41c17130866d7036c5f0cde47e8854af...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_Byte

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

  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.90 ns | 5.99 ns | 0.76 | 0.01 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.54 ns | 7.93 ns | 0.83 | 0.00 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.50 ns | 8.16 ns | 0.86 | 0.02 | False | | |

![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.Tests.Perf_Byte*'
```

### System.Tests.Perf_Byte.TryParse(value: "0")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.Parse(value: "255")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.TryParse(value: "255")

#### 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 | [f9a6e2ef41c17130866d7036c5f0cde47e8854af](https://github.com/dotnet/runtime/commit/f9a6e2ef41c17130866d7036c5f0cde47e8854af)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f9a6e2ef41c17130866d7036c5f0cde47e8854af...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_Int16

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

  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.16 ns | 5.80 ns | 0.71 | 0.01 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.15 ns | 6.02 ns | 0.74 | 0.00 | 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 'System.Tests.Perf_Int16*'
```

### System.Tests.Perf_Int16.Parse(value: "0")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int16.TryParse(value: "0")

#### 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 | [f9a6e2ef41c17130866d7036c5f0cde47e8854af](https://github.com/dotnet/runtime/commit/f9a6e2ef41c17130866d7036c5f0cde47e8854af)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f9a6e2ef41c17130866d7036c5f0cde47e8854af...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_UInt16

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

  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.89 ns | 5.75 ns | 0.73 | 0.01 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.89 ns | 5.77 ns | 0.73 | 0.00 | 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 'System.Tests.Perf_UInt16*'
```

### System.Tests.Perf_UInt16.TryParse(value: "0")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_UInt16.Parse(value: "0")

#### 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 | [f9a6e2ef41c17130866d7036c5f0cde47e8854af](https://github.com/dotnet/runtime/commit/f9a6e2ef41c17130866d7036c5f0cde47e8854af)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f9a6e2ef41c17130866d7036c5f0cde47e8854af...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_SByte

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

  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.07 ns | 9.06 ns | 0.90 | 0.02 | 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.Tests.Perf_SByte*'
```

### System.Tests.Perf_SByte.TryParse(value: "-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 with the linked benchmark sources src/benchmarks/micro/libraries/System.Runtime/Perf.Byte.cs and Perf.Int16.cs, then run the provided benchmarks_ci.py commands for System.Tests.Perf_Byte and System.Tests.Perf_Int16. Compare the reported Windows/x86 results with the linked baseline and comparison data; the issue does not specify a code change or a clear completion condition.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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