[Perf] Linux/x64: 2 Regressions on 4/10/2026 2:16:16 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [e52493553982a80cd4c7d372c104e3a9dbff0e0d](https://github.com/dotnet/sdk/commit/e52493553982a80cd4c7d372c104e3a9dbff0e0d)
Compare | [36afe73557f5f93cd7bc827cb644a3ff018eca0b](https://github.com/dotnet/sdk/commit/36afe73557f5f93cd7bc827cb644a3ff018eca0b)
Diff | [Diff](https://github.com/dotnet/sdk/compare/e52493553982a80cd4c7d372c104e3a9dbff0e0d...36afe73557f5f93cd7bc827cb644a3ff018eca0b)
Configs | CompilationMode:tiered, RunKind:fsharpmicro

### Regressions in MicroBenchmarks.FSharp.Collections+CollectionsBenchmark

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

• [ArrayUpdateEnd - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 1.61 μs | 1.75 μs | 1.09 | 0.01 | False | | |
|

• [ArrayUpdateAtBeginning - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 1.62 μs | 1.75 μs | 1.08 | 0.01 | False | | |

![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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.FSharp.Collections+CollectionsBenchmark*'
```

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayUpdateEnd(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayUpdateAtBeginning(Length: 10000)

#### 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)