[Perf] Linux/x64: 2 Regressions on 7/13/2026 3:15:10 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [8df98c4d2d17bcba98193afa9ae2e72908921f86](https://github.com/dotnet/runtime/commit/8df98c4d2d17bcba98193afa9ae2e72908921f86)
Compare | [db330a0e1ac8c7950a07271b2a5d8ac1830243bf](https://github.com/dotnet/runtime/commit/db330a0e1ac8c7950a07271b2a5d8ac1830243bf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8df98c4d2d17bcba98193afa9ae2e72908921f86...db330a0e1ac8c7950a07271b2a5d8ac1830243bf)
Configs | CompilationMode:wasm, RunKind:micro

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

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

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

| 250.14 ns | 396.92 ns | 1.59 | 0.25 | False | | |
|

• [TryParseUInt32Hex - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 61.69 ns | 67.55 ns | 1.09 | 0.30 | False | | |

![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.TryParseDecimal(value: 123456.789)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseUInt32Hex(value: 3039)

#### 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)

Start with the benchmark at performance/src/benchmarks/micro/libraries/System.Buffers/Utf8ParserTests.cs, then read the benchmarking workflow linked in the issue. Reproduce the TryParseDecimal and TryParseUInt32Hex results with benchmarks_ci.py and compare the listed baseline and test commits. Done means the regression is explained and the affected benchmark results are validated after the change.

Written by the indexing model from the issue text.