[Perf] Linux/arm64: 2 Regressions on 6/2/2026 2:34:36 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [0dfd787f3c16e18e1641d20d8cce1789c9488b00](https://github.com/dotnet/runtime/commit/0dfd787f3c16e18e1641d20d8cce1789c9488b00)
Compare | [db876108487455505360c75f5a978436a884f4d7](https://github.com/dotnet/runtime/commit/db876108487455505360c75f5a978436a884f4d7)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0dfd787f3c16e18e1641d20d8cce1789c9488b00...db876108487455505360c75f5a978436a884f4d7)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.ContainsTrue&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ImmutableList - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04/System.Collections.ContainsTrue(Int32).ImmutableList(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs#L236-#L245>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 378.12 μs | 447.24 μs | 1.18 | 0.12 | False | | |
|<ul><li>[List - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04/System.Collections.ContainsTrue(Int32).List(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs#L78-#L87>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 28.66 μs | 31.13 μs | 1.09 | 0.04 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_04_2026/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.ContainsTrue%28Int32%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_04_2026/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.ContainsTrue%28Int32%29_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_04_2026/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.ContainsTrue%28Int32%29.html>)

### 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 'System.Collections.ContainsTrue<Int32>*'
```

<details>

### System.Collections.ContainsTrue&lt;Int32&gt;.ImmutableList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.ContainsTrue&lt;Int32&gt;.List(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)

</details>

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[Perf] Linux/arm64: 2 Regressions on 6/2/2026 2:34:36 PM +00:00 #128996

Run Information

Regressions in System.Collections.ContainsTrue<Int32>

Repro

System.Collections.ContainsTrue<Int32>.ImmutableList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.ContainsTrue<Int32>.List(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Assignees

Labels

Type

Fields

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Development

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	0dfd787f3c16e18e1641d20d8cce1789c9488b00
Compare	db876108487455505360c75f5a978436a884f4d7
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
ImmutableList - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	378.12 μs	447.24 μs	1.18	0.12	False
List - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	28.66 μs	31.13 μs	1.09	0.04	False

[Perf] Linux/arm64: 2 Regressions on 6/2/2026 2:34:36 PM +00:00 #128996

Description

Run Information

Regressions in System.Collections.ContainsTrue<Int32>

Repro

System.Collections.ContainsTrue<Int32>.ImmutableList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.ContainsTrue<Int32>.List(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions