[Perf] Windows/x64: 2 Regressions on 7/3/2026 8:54:59 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4895d1315f4855111e88c88c726c4f2aca4c6adf](https://github.com/dotnet/sdk/commit/4895d1315f4855111e88c88c726c4f2aca4c6adf)
Compare | [bcaa8d44d57494224d443dba7c1dfed381ad5528](https://github.com/dotnet/sdk/commit/bcaa8d44d57494224d443dba7c1dfed381ad5528)
Diff | [Diff](https://github.com/dotnet/sdk/compare/4895d1315f4855111e88c88c726c4f2aca4c6adf...bcaa8d44d57494224d443dba7c1dfed381ad5528)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.TwoBodyConstraintBenchmarks

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

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

| 42.70 μs | 62.24 μs | 1.46 | 0.00 | True | | |

![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.AngularSwivelHinge

#### 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 | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4895d1315f4855111e88c88c726c4f2aca4c6adf](https://github.com/dotnet/sdk/commit/4895d1315f4855111e88c88c726c4f2aca4c6adf)
Compare | [bcaa8d44d57494224d443dba7c1dfed381ad5528](https://github.com/dotnet/sdk/commit/bcaa8d44d57494224d443dba7c1dfed381ad5528)
Diff | [Diff](https://github.com/dotnet/sdk/compare/4895d1315f4855111e88c88c726c4f2aca4c6adf...bcaa8d44d57494224d443dba7c1dfed381ad5528)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GatherScatterBenchmarks

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

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

| 21.32 μs | 24.07 μs | 1.13 | 0.00 | True | | |

![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.GatherScatterBenchmarks*'
```

### DemoBenchmarks.GatherScatterBenchmarks.GatherState

#### 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 and GatherScatterBenchmarks.cs at the linked benchmark ranges, then run the provided benchmarks_ci.py commands. Compare the baseline and test commits and inspect the linked reports for both regressions. Done means the cause of the Windows/x64 performance changes is identified and the benchmark result is validated.

Written by the indexing model from the issue text.