[Perf] Linux/x64: 12 Improvements on 5/28/2026 7:26:44 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2a546738e968e3f75092657d4bee6bd21821e069](https://github.com/dotnet/runtime/commit/2a546738e968e3f75092657d4bee6bd21821e069)
Compare | [54cfeb453970e794043c71448a60a39b4fee3a38](https://github.com/dotnet/runtime/commit/54cfeb453970e794043c71448a60a39b4fee3a38)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a546738e968e3f75092657d4bee6bd21821e069...54cfeb453970e794043c71448a60a39b4fee3a38)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Globalization.Tests.StringSearch

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

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

| 5.54 μs | 4.20 μs | 0.76 | 0.11 | False | | |
|

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

| 12.82 μs | 9.74 μs | 0.76 | 0.05 | False | | |
|

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

| 5.74 μs | 4.39 μs | 0.77 | 0.10 | False | | |
|

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

| 5.70 μs | 4.44 μs | 0.78 | 0.09 | False | | |
|

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

| 13.16 μs | 10.26 μs | 0.78 | 0.09 | False | | |
|

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

| 6.18 μs | 4.83 μs | 0.78 | 0.15 | False | | |
|

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

| 5.72 μs | 4.53 μs | 0.79 | 0.14 | False | | |
|

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

| 20.33 μs | 16.81 μs | 0.83 | 0.02 | False | | |
|

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

| 15.49 μs | 13.88 μs | 0.90 | 0.05 | False | | |
|

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

| 8.57 μs | 7.90 μs | 0.92 | 0.06 | False | | |
|

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

| 9.64 μs | 8.92 μs | 0.93 | 0.14 | False | | |
|

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

| 10.56 μs | 9.94 μs | 0.94 | 0.06 | 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.Globalization.Tests.StringSearch*'
```

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (pl-PL, None, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.LastIndexOf_Word_NotFound(Options: (en-US, IgnoreSymbols, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (, IgnoreCase, True))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (en-US, IgnoreCase, True))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.LastIndexOf_Word_NotFound(Options: (pl-PL, None, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (en-US, None, True))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (, None, True))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_DifferentLastChar(Options: (en-US, IgnoreSymbols, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsPrefix_DifferentFirstChar(Options: (en-US, IgnoreSymbols, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsPrefix_FirstHalf(Options: (en-US, IgnoreSymbols, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IndexOf_Word_NotFound(Options: (en-US, None, True))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsSuffix_SecondHalf(Options: (en-US, IgnoreSymbols, False))

#### 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)