[Perf] Windows/x86: 2 Improvements on 5/28/2026 1:46:30 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [d78013e4cb65077b47ed973db979946417a92930](https://github.com/dotnet/runtime/commit/d78013e4cb65077b47ed973db979946417a92930)
Compare | [87494fa4b24e277aa7cbb927f032ecebe4fbde21](https://github.com/dotnet/runtime/commit/87494fa4b24e277aa7cbb927f032ecebe4fbde21)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d78013e4cb65077b47ed973db979946417a92930...87494fa4b24e277aa7cbb927f032ecebe4fbde21)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.IterateForEach<Int32>

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

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

| 1.26 μs | 1.12 μs | 0.89 | 0.12 | 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.Collections.IterateForEach*'
```

### System.Collections.IterateForEach<Int32>.HashSet(Size: 512)

#### 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 | [d78013e4cb65077b47ed973db979946417a92930](https://github.com/dotnet/runtime/commit/d78013e4cb65077b47ed973db979946417a92930)
Compare | [87494fa4b24e277aa7cbb927f032ecebe4fbde21](https://github.com/dotnet/runtime/commit/87494fa4b24e277aa7cbb927f032ecebe4fbde21)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d78013e4cb65077b47ed973db979946417a92930...87494fa4b24e277aa7cbb927f032ecebe4fbde21)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in PerfLabTests.CastingPerf2.CastingPerf

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

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

| 758.77 μs | 619.82 μs | 0.82 | 0.21 | 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 'PerfLabTests.CastingPerf2.CastingPerf*'
```

### PerfLabTests.CastingPerf2.CastingPerf.ObjrefValueTypeObj

#### 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)