[Perf] Linux/x64: 6 Regressions on 3/27/2026 4:40:59 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [487cc8c4a5776931d7d573444f2b6c08b65f1e27](https://github.com/dotnet/runtime/commit/487cc8c4a5776931d7d573444f2b6c08b65f1e27)
Compare | [3106c4ff21d8f6a13db84571ce4c4ba32c81d032](https://github.com/dotnet/runtime/commit/3106c4ff21d8f6a13db84571ce4c4ba32c81d032)
Diff | [Diff](https://github.com/dotnet/runtime/compare/487cc8c4a5776931d7d573444f2b6c08b65f1e27...3106c4ff21d8f6a13db84571ce4c4ba32c81d032)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_BigInteger

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

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

| 11.75 ns | 20.90 ns | 1.78 | 0.27 | False | | |
|

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

| 9.44 ns | 13.91 ns | 1.47 | 0.13 | False | | |
|

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

| 59.37 ns | 71.55 ns | 1.21 | 0.07 | False | | |
|

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

| 13.39 ns | 15.52 ns | 1.16 | 0.09 | False | | |
|

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

| 63.32 ns | 70.03 ns | 1.11 | 0.06 | False | | |
|

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

| 50.19 ns | 53.15 ns | 1.06 | 0.02 | False | | |

[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 'System.Numerics.Tests.Perf_BigInteger*'
```

### System.Numerics.Tests.Perf_BigInteger.Divide(arguments: 16,8 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.ToByteArray(numberString: -2147483648)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Subtract(arguments: 1024,1024 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.ToByteArray(numberString: 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Add(arguments: 1024,1024 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.ModPow(arguments: 16,16,16 bits)

#### 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)