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NET-936 Modify S3247: Add benchmarks (#4596)

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* Add benchmark

* Adopt benchmark

* Remove Ratio column
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rules/S3247/csharp/rule.adoc
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@ -43,4 +43,112 @@ if (x is Fruit fruit)
* Microsoft Learn - https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/is[is operator (C# reference)]
* Microsoft Learn - https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/functional/pattern-matching[Pattern matching overview]
=== Benchmarks
[options="header"]
|===
| Method | Runtime | Mean | Standard Deviation
| IsPattern_Class | .NET 9.0 | 176.48 ns | 0.765 ns
| IsWithCast_Class | .NET 9.0 | 246.12 ns | 22.391 ns
| | | |
| IsPattern_Class | .NET Framework 4.8.1 | 325.11 ns | 14.435 ns
| IsWithCast_Class | .NET Framework 4.8.1 | 311.22 ns | 11.145 ns
| | | |
| IsPattern_Interface | .NET 9.0 | 26.77 ns | 1.123 ns
| IsWithCast_Interface | .NET 9.0 | 26.45 ns | 2.115 ns
| | | |
| IsPattern_Interface | .NET Framework 4.8.1 | 119.80 ns | 5.411 ns
| IsWithCast_Interface | .NET Framework 4.8.1 | 119.33 ns | 4.380 ns
| | | |
| IsPattern_ValueType | .NET 9.0 | 22.58 ns | 1.161 ns
| IsWithCast_ValueType | .NET 9.0 | 19.41 ns | 2.675 ns
| | | |
| IsPattern_ValueType | .NET Framework 4.8.1 | 39.66 ns | 0.645 ns
| IsWithCast_ValueType | .NET Framework 4.8.1 | 41.34 ns | 0.462 ns
|===
==== Glossary
* https://en.wikipedia.org/wiki/Arithmetic_mean[Mean]
* https://en.wikipedia.org/wiki/Standard_deviation[Standard Deviation]
The results were generated by running the following snippet with https://github.com/dotnet/BenchmarkDotNet[BenchmarkDotNet]:
[source,csharp]
----
private Random random = new Random(1);
private object ReturnSometimes<T>() where T : new() =>
random.Next(2) switch
{
0 => new T(),
1 => new object(),
};
[BenchmarkCategory("ValueType"), Benchmark(Baseline = true)]
public int IsPattern_ValueType()
{
var i = ReturnSometimes<int>();
return i is int d
? d
: default;
}
[BenchmarkCategory("ValueType"), Benchmark]
public int IsWithCast_ValueType()
{
var i = ReturnSometimes<int>();
return i is int
? (int)i
: default;
}
[BenchmarkCategory("Class"), Benchmark(Baseline = true)]
public DuplicateCasts IsPattern_Class()
{
var i = ReturnSometimes<DuplicateCasts>();
return i is DuplicateCasts d
? d
: default;
}
[BenchmarkCategory("Class"), Benchmark]
public DuplicateCasts IsWithCast_Class()
{
var i = ReturnSometimes<DuplicateCasts>();
return i is DuplicateCasts
? (DuplicateCasts)i
: default;
}
[BenchmarkCategory("Interface"), Benchmark(Baseline = true)]
public IReadOnlyList<int> IsPattern_Interface()
{
var i = ReturnSometimes<List<int>>();
return i is IReadOnlyList<int> d
? d
: default;
}
[BenchmarkCategory("Interface"), Benchmark]
public IReadOnlyList<int> IsWithCast_Interface()
{
var i = ReturnSometimes<List<int>>();
return i is IReadOnlyList<int>
? (IReadOnlyList<int>)i
: default;
}
----
Hardware configuration:
[source]
----
BenchmarkDotNet v0.14.0, Windows 10 (10.0.19045.5247/22H2/2022Update)
Intel Core Ultra 7 165H, 1 CPU, 22 logical and 16 physical cores
[Host] : .NET Framework 4.8.1 (4.8.9282.0), X64 RyuJIT VectorSize=256
.NET 9.0 : .NET 9.0.0 (9.0.24.52809), X64 RyuJIT AVX2
.NET Framework 4.8.1 : .NET Framework 4.8.1 (4.8.9282.0), X64 RyuJIT VectorSize=256
----
include::../rspecator.adoc[]