[Perf] Windows/x86: 5 Regressions on 7/8/2026 10:47:18 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc](https://github.com/dotnet/runtime/commit/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Tests.Perf_Int32

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

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

| 21.45 ns | 32.84 ns | 1.53 | 0.22 | False | | |
|

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

| 11.92 ns | 16.55 ns | 1.39 | 0.03 | False | | |
|

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

| 11.92 ns | 13.37 ns | 1.12 | 0.03 | False | | |
|

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

| 11.30 ns | 12.33 ns | 1.09 | 0.04 | False | | |

![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.Tests.Perf_Int32*'
```

### System.Tests.Perf_Int32.ParseHex(value: "80000000")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.ParseHex(value: "3039")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.TryParseSpan(value: "-2147483648")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.TryParse(value: "2147483647")

#### 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 | [3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc](https://github.com/dotnet/runtime/commit/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc)
Compare | [e302d2a27aef2196c8d710752da8b7726c5fe84d](https://github.com/dotnet/runtime/commit/e302d2a27aef2196c8d710752da8b7726c5fe84d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3ade0b55c797a31f6800040e3ae3c5c75bc0d2dc...e302d2a27aef2196c8d710752da8b7726c5fe84d)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Net.Tests.Perf_WebUtility

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

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

| 101.75 ns | 117.22 ns | 1.15 | 0.07 | 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.Net.Tests.Perf_WebUtility*'
```

### System.Net.Tests.Perf_WebUtility.HtmlDecode_Entities

#### 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 by reproducing the listed benchmarks with the provided benchmarks_ci.py commands, then read src/benchmarks/micro/libraries/System.Runtime/Perf.Int32.cs and src/benchmarks/micro/libraries/System.Runtime.Extensions/Perf.WebUtility.cs. Compare the reported baseline and commit results using the linked test reports and runtime diff. Done means the Windows/x86 regressions are explained and the affected benchmarks no longer show the regression.

Written by the indexing model from the issue text.