[Perf] Linux/arm64: 4 Regressions on 2/13/2026 10:59:41 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [d71d920d25d8ba5e85e48b6321ae5e805567075b](https://github.com/dotnet/sdk/commit/d71d920d25d8ba5e85e48b6321ae5e805567075b)
Compare | [6c0056a47a62a7445668bf597bb7242358cd7d8f](https://github.com/dotnet/sdk/commit/6c0056a47a62a7445668bf597bb7242358cd7d8f)
Diff | [Diff](https://github.com/dotnet/sdk/compare/d71d920d25d8ba5e85e48b6321ae5e805567075b...6c0056a47a62a7445668bf597bb7242358cd7d8f)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

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

| 10.74 ns | 13.08 ns | 1.22 | 0.33 | False | | |
|

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

| 0.90 ns | 3.14 ns | 3.50 | 0.26 | False | | |
|

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

| 0.80 ns | 3.14 ns | 3.93 | 0.34 | False | | |
|

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

| 10.74 ns | 13.09 ns | 1.22 | 0.37 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.FSharp.Collections+CollectionsBenchmark*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ListRemoveAtBeginning(Length: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ListRemoveManyAtBeginning(Length: 1000)

#### 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)