[Perf] Windows/x64: 2 Regressions on 8/24/2026 9:00:53 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [64a29867c5c5c8e0babc9e31313cf3b6e50f0193](https://github.com/dotnet/sdk/commit/64a29867c5c5c8e0babc9e31313cf3b6e50f0193)
Compare | [c545c4e3f9e2ebc10c6b3e2626187e18569adcf2](https://github.com/dotnet/sdk/commit/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2)
Diff | [Diff](https://github.com/dotnet/sdk/compare/64a29867c5c5c8e0babc9e31313cf3b6e50f0193...c545c4e3f9e2ebc10c6b3e2626187e18569adcf2)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.TwoBodyConstraintBenchmarks

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

• [Contact4Nonconvex - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 485.04 μs | 611.83 μs | 1.26 | 0.00 | True | | |
|

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

| 118.44 μs | 133.08 μs | 1.12 | 0.00 | True | | |

![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 'DemoBenchmarks.TwoBodyConstraintBenchmarks*'
```

### DemoBenchmarks.TwoBodyConstraintBenchmarks.Contact4Nonconvex

#### ETL Files

#### Histogram

#### JIT Disasms

### DemoBenchmarks.TwoBodyConstraintBenchmarks.SwivelHinge

#### 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 src/benchmarks/real-world/bepuphysics2/TwoBodyConstraintBenchmarks.cs at the Contact4Nonconvex and SwivelHinge benchmarks. Run the provided benchmarks_ci.py command and compare the results with the linked baseline and test reports. Done means identifying the cause of both Windows/x64 regressions and confirming that the affected benchmark results no longer regress.

Written by the indexing model from the issue text.