[Perf] Linux/arm64: 2 Improvements on 6/25/2026 11:48:06 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [d6c7fb69f882c3ffd49de58dd009330e2a915402](https://github.com/dotnet/runtime/commit/d6c7fb69f882c3ffd49de58dd009330e2a915402)
Compare | [99eb16b5420fe88e333e2d95600b8617a86d54ff](https://github.com/dotnet/runtime/commit/99eb16b5420fe88e333e2d95600b8617a86d54ff)
Diff | [Diff](https://github.com/dotnet/runtime/compare/d6c7fb69f882c3ffd49de58dd009330e2a915402...99eb16b5420fe88e333e2d95600b8617a86d54ff)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in Exceptions.Handling

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

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

| 7.62 μs | 7.14 μs | 0.94 | 0.15 | False | | |
|

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

| 2.32 μs | 2.18 μs | 0.94 | 0.26 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Exceptions.Handling*'
```

### Exceptions.Handling.ThrowAndCatch_ManyCatchBlocks(kind: ReflectionSoftware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryCatch_FirstCatches(kind: Software)

#### 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 linked benchmark source in src/benchmarks/micro/runtime/Exceptions/Handling.cs, especially ThrowAndCatch_ManyCatchBlocks and MultipleNestedTryCatch_FirstCatches, then follow docs/benchmarking-workflow-dotnet-runtime.md. Reproduce the Exceptions.Handling benchmarks with the supplied benchmarks_ci.py command on the stated arm64 Azure Linux setup. Done requires identifying whether the measured improvement needs runtime follow-up or is expected noise.

Written by the indexing model from the issue text.