[Perf] Linux/x64: 4 Regressions on 4/27/2026 2:35:20 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a8f71804178cb4fecd150e45082359dd11d71a76](https://github.com/dotnet/runtime/commit/a8f71804178cb4fecd150e45082359dd11d71a76)
Compare | [14d3e32854a013d8d608f60263a164291367cd4d](https://github.com/dotnet/runtime/commit/14d3e32854a013d8d608f60263a164291367cd4d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a8f71804178cb4fecd150e45082359dd11d71a76...14d3e32854a013d8d608f60263a164291367cd4d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Buffers.Text.Tests.Utf8ParserTests

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

• [TryParseInt64 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.54 μs | 3.47 μs | 1.36 | 0.34 | False | | |
|

• [TryParseUInt32 - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 342.28 ns | 437.11 ns | 1.28 | 0.36 | False | | |
|

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

| 767.03 ns | 873.07 ns | 1.14 | 0.34 | False | | |

![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 'System.Buffers.Text.Tests.Utf8ParserTests*'
```

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseInt64(value: 9223372036854775807)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseUInt32(value: 0)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseSByte(value: -128)

#### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a8f71804178cb4fecd150e45082359dd11d71a76](https://github.com/dotnet/runtime/commit/a8f71804178cb4fecd150e45082359dd11d71a76)
Compare | [14d3e32854a013d8d608f60263a164291367cd4d](https://github.com/dotnet/runtime/commit/14d3e32854a013d8d608f60263a164291367cd4d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a8f71804178cb4fecd150e45082359dd11d71a76...14d3e32854a013d8d608f60263a164291367cd4d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in PerfLabTests.LowLevelPerf

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

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

| 367.18 ms | 417.98 ms | 1.14 | 0.36 | False | | |

![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 'PerfLabTests.LowLevelPerf*'
```

### PerfLabTests.LowLevelPerf.MeasureEvents

#### 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)