[Perf] Linux/x64: 8 Regressions on 4/30/2026 9:42:58 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [dd17b6dcc548fed9998e4f76c8708b57c5e5dd78](https://github.com/dotnet/runtime/commit/dd17b6dcc548fed9998e4f76c8708b57c5e5dd78)
Compare | [84e5e272bf2c09d7a683025429b9d0db7a2ac579](https://github.com/dotnet/runtime/commit/84e5e272bf2c09d7a683025429b9d0db7a2ac579)
Diff | [Diff](https://github.com/dotnet/runtime/compare/dd17b6dcc548fed9998e4f76c8708b57c5e5dd78...84e5e272bf2c09d7a683025429b9d0db7a2ac579)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_Guid

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

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

| 11.00 μs | 15.14 μs | 1.38 | 0.35 | False | | |
|

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

| 306.40 ns | 380.00 ns | 1.24 | 0.41 | False | | |
|

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

| 122.51 ns | 142.44 ns | 1.16 | 0.25 | False | | |
|

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

| 301.58 ns | 348.32 ns | 1.15 | 0.39 | False | | |
|

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

| 302.34 ns | 348.24 ns | 1.15 | 0.44 | False | | |
|

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

| 11.20 μs | 12.79 μs | 1.14 | 0.34 | False | | |
|

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

| 277.83 ns | 310.80 ns | 1.12 | 0.36 | False | | |
|

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

| 11.03 μs | 12.34 μs | 1.12 | 0.40 | False | | |

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[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.Tests.Perf_Guid*'
```

### System.Tests.Perf_Guid.ParseExactD

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.EqualsOperator

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.EqualsNotSame

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.EqualsSame

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.ctor_bytes

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.ctor_str

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.TryWriteBytes

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Guid.Parse

#### 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)