[Perf] Linux/arm64: 7 Regressions on 2/25/2024 4:37:10 PM

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f32c428c86b4cc41e88e2e5a750c37dfb354e33a](https://github.com/dotnet/runtime/commit/f32c428c86b4cc41e88e2e5a750c37dfb354e33a)
Compare | [5ef47c852ffd51aaeb52e34391fe4fed261c9f26](https://github.com/dotnet/runtime/commit/5ef47c852ffd51aaeb52e34391fe4fed261c9f26)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f32c428c86b4cc41e88e2e5a750c37dfb354e33a...5ef47c852ffd51aaeb52e34391fe4fed261c9f26)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.Tests.Perf_BitArray

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[BitArrayRightShift - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Collections.Tests.Perf_BitArray.BitArrayRightShift(Size%3a%204).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Perf.BitArray.cs#L82-#L83>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 6.60 ns | 7.77 ns | 1.18 | 0.36 | False | | |
|<ul><li>[BitArrayCopyToByteArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Collections.Tests.Perf_BitArray.BitArrayCopyToByteArray(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Perf.BitArray.cs#L151-#L152>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 155.28 ns | 174.69 ns | 1.12 | 0.06 | False | | |
|<ul><li>[BitArrayLeftShift - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Collections.Tests.Perf_BitArray.BitArrayLeftShift(Size%3a%204).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Perf.BitArray.cs#L85-#L86>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 4.01 ns | 6.87 ns | 1.71 | 0.58 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.Tests.Perf_BitArray_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.Tests.Perf_BitArray_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.Tests.Perf_BitArray_3.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.Tests.Perf_BitArray.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.Tests.Perf_BitArray*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-1557b50c-b735-49d0-a5da-dd9c09470130db3af78be864ee1a9/3d0dfed8-a205-4169-9dc6-8dc056cf3f79.zip?sv=2021-08-06&se=2024-03-25T16%3A33%3A53Z&sr=c&sp=rl&sig=f6IrSene3XGN%2BvaKedtbD88KPMhiBwv%2BCvQhTgJeTMY%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-56a937a1-25d1-49b7-868b-8e85cfc74a0ff14f5217a0840318f/2b6e4096-aaec-4c9c-9730-b1803cb59bd5.zip?sv=2021-08-06&se=2024-03-27T04%3A15%3A52Z&sr=c&sp=rl&sig=72o%2BHWVNEJL%2BN8276xwYQsUlMCyIR0wleQAgP%2F3D%2BDg%3D>)
### System.Collections.Tests.Perf_BitArray.BitArrayRightShift(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToByteArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayLeftShift(Size: 4)

#### 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>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f32c428c86b4cc41e88e2e5a750c37dfb354e33a](https://github.com/dotnet/runtime/commit/f32c428c86b4cc41e88e2e5a750c37dfb354e33a)
Compare | [5ef47c852ffd51aaeb52e34391fe4fed261c9f26](https://github.com/dotnet/runtime/commit/5ef47c852ffd51aaeb52e34391fe4fed261c9f26)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f32c428c86b4cc41e88e2e5a750c37dfb354e33a...5ef47c852ffd51aaeb52e34391fe4fed261c9f26)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Memory.Span&lt;Byte&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Fill - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Memory.Span(Byte).Fill(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L43-#L44>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 11.22 ns | 13.50 ns | 1.20 | 0.61 | False | | |
|<ul><li>[Clear - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Memory.Span(Byte).Clear(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L40-#L41>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 8.87 ns | 16.31 ns | 1.84 | 0.57 | False | | |
|<ul><li>[EndsWith - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Memory.Span(Byte).EndsWith(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L64-#L65>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 4.63 ns | 7.21 ns | 1.56 | 0.41 | False | | |
|<ul><li>[EndsWith - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Memory.Span(Byte).EndsWith(Size%3a%204).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L64-#L65>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 3.11 ns | 4.88 ns | 1.57 | 0.56 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Memory.Span%28Byte%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Memory.Span%28Byte%29_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Memory.Span%28Byte%29_3.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Memory.Span%28Byte%29_4.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/02_29_2024/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Memory.Span%28Byte%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.Memory.Span&lt;Byte&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-1557b50c-b735-49d0-a5da-dd9c09470130db3af78be864ee1a9/3d0dfed8-a205-4169-9dc6-8dc056cf3f79.zip?sv=2021-08-06&se=2024-03-25T16%3A33%3A53Z&sr=c&sp=rl&sig=f6IrSene3XGN%2BvaKedtbD88KPMhiBwv%2BCvQhTgJeTMY%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-56a937a1-25d1-49b7-868b-8e85cfc74a0ff14f5217a0840318f/2b6e4096-aaec-4c9c-9730-b1803cb59bd5.zip?sv=2021-08-06&se=2024-03-27T04%3A15%3A52Z&sr=c&sp=rl&sig=72o%2BHWVNEJL%2BN8276xwYQsUlMCyIR0wleQAgP%2F3D%2BDg%3D>)
### System.Memory.Span&lt;Byte&gt;.Fill(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.Clear(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.EndsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.EndsWith(Size: 4)

#### 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>

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	f32c428c86b4cc41e88e2e5a750c37dfb354e33a
Compare	5ef47c852ffd51aaeb52e34391fe4fed261c9f26
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
BitArrayRightShift - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	6.60 ns	7.77 ns	1.18	0.36	False
BitArrayCopyToByteArray - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	155.28 ns	174.69 ns	1.12	0.06	False
BitArrayLeftShift - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	4.01 ns	6.87 ns	1.71	0.58	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Fill - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	11.22 ns	13.50 ns	1.20	0.61	False
Clear - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	8.87 ns	16.31 ns	1.84	0.57	False
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	4.63 ns	7.21 ns	1.56	0.41	False
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	3.11 ns	4.88 ns	1.57	0.56	False

[Perf] Linux/arm64: 7 Regressions on 2/25/2024 4:37:10 PM #99122

Description

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Regressions in System.Collections.Tests.Perf_BitArray

Repro

Payloads

System.Collections.Tests.Perf_BitArray.BitArrayRightShift(Size: 4)

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JIT Disasms

System.Collections.Tests.Perf_BitArray.BitArrayCopyToByteArray(Size: 512)

ETL Files

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JIT Disasms

System.Collections.Tests.Perf_BitArray.BitArrayLeftShift(Size: 4)

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JIT Disasms

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Regressions in System.Memory.Span<Byte>

Repro

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System.Memory.Span<Byte>.Fill(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.Clear(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.EndsWith(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.EndsWith(Size: 4)

ETL Files

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JIT Disasms

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