[Perf] Windows/x86: 8 Regressions on 7/31/2026 2:45:28 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [fdccdc6954791fcde7ffa2834d75930c0efa5456](https://github.com/dotnet/runtime/commit/fdccdc6954791fcde7ffa2834d75930c0efa5456)
Compare | [ba8afceee83540ed1d867987483f74d4ad2cfae9](https://github.com/dotnet/runtime/commit/ba8afceee83540ed1d867987483f74d4ad2cfae9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/fdccdc6954791fcde7ffa2834d75930c0efa5456...ba8afceee83540ed1d867987483f74d4ad2cfae9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Tests.Perf_Double

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]()

| 101.38 ns | 108.19 ns | 1.07 | 0.01 | False | | |
|

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

| 104.03 ns | 110.80 ns | 1.07 | 0.01 | False | | |
|

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

| 110.98 ns | 118.08 ns | 1.06 | 0.00 | False | | |
|

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

| 108.20 ns | 114.98 ns | 1.06 | 0.01 | 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_Double*'
```

### System.Tests.Perf_Double.TryParse(value: "-1.7976931348623157e+308")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Double.TryParse(value: "1.7976931348623157e+308")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Double.Parse(value: "1.7976931348623157e+308")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Double.Parse(value: "-1.7976931348623157e+308")

#### 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 | [fdccdc6954791fcde7ffa2834d75930c0efa5456](https://github.com/dotnet/runtime/commit/fdccdc6954791fcde7ffa2834d75930c0efa5456)
Compare | [ba8afceee83540ed1d867987483f74d4ad2cfae9](https://github.com/dotnet/runtime/commit/ba8afceee83540ed1d867987483f74d4ad2cfae9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/fdccdc6954791fcde7ffa2834d75930c0efa5456...ba8afceee83540ed1d867987483f74d4ad2cfae9)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Tests.Perf_Single

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]()

| 70.94 ns | 78.51 ns | 1.11 | 0.02 | False | | |
|

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

| 75.88 ns | 83.96 ns | 1.11 | 0.02 | False | | |
|

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

| 69.47 ns | 76.58 ns | 1.10 | 0.02 | False | | |
|

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

| 74.90 ns | 81.72 ns | 1.09 | 0.00 | 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_Single*'
```

### System.Tests.Perf_Single.TryParse(value: "3.4028235E+38")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Single.Parse(value: "3.4028235E+38")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Single.TryParse(value: "-3.4028235E+38")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Single.Parse(value: "-3.4028235E+38")

#### 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 with the referenced benchmark entries in src/benchmarks/micro/libraries/System.Runtime/Perf.Double.cs and Perf.Single.cs, then run the provided benchmarks_ci.py command for System.Tests.Perf_Double. Compare the baseline and test results for the Windows x86 regressions. Done means determining the cause of the reported Parse and TryParse performance changes and addressing the regression.

Written by the indexing model from the issue text.