This benchmark compares various types of branching that is possible inside of C#: switch statements, switch expressions, if statements, and conditional expressions.
Note: large conditional expressions cause a StackOverflowException in Roslyn and cannot be built.
BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18363.1016 (1909/November2018Update/19H2)
Intel Core i7-4790K CPU 4.00GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=5.0.100-preview.8.20417.9
[Host] : .NET Core 5.0.0 (CoreCLR 5.0.20.40711, CoreFX 5.0.20.40711), X64 RyuJIT
DefaultJob : .NET Core 5.0.0 (CoreCLR 5.0.20.40711, CoreFX 5.0.20.40711), X64 RyuJIT
| Method | Mean | Error | StdDev | Median |
|---|---|---|---|---|
| switchStatement1 | 0.0014 ns | 0.0029 ns | 0.0027 ns | 0.0000 ns |
| switchExpression1 | 0.2407 ns | 0.0097 ns | 0.0090 ns | 0.2412 ns |
| if1 | 0.2357 ns | 0.0076 ns | 0.0071 ns | 0.2352 ns |
| conditional1 | 0.5756 ns | 0.0365 ns | 0.0448 ns | 0.5699 ns |
| switchStatement2 | 1.4590 ns | 0.0133 ns | 0.0124 ns | 1.4559 ns |
| switchExpression2 | 1.5196 ns | 0.0555 ns | 0.0814 ns | 1.5300 ns |
| if2 | 1.3594 ns | 0.0532 ns | 0.0523 ns | 1.3353 ns |
| conditional2 | 1.1767 ns | 0.0333 ns | 0.0311 ns | 1.1730 ns |
| switchStatement3 | 4.1114 ns | 0.0771 ns | 0.0602 ns | 4.1107 ns |
| switchExpression3 | 4.3437 ns | 0.1110 ns | 0.1520 ns | 4.3152 ns |
| if3 | 3.8700 ns | 0.0404 ns | 0.0358 ns | 3.8752 ns |
| conditional3 | 3.5161 ns | 0.0676 ns | 0.0632 ns | 3.5530 ns |
| switchStatement4 | 5.6173 ns | 0.0763 ns | 0.1470 ns | 5.6022 ns |
| switchExpression4 | 6.1340 ns | 0.1434 ns | 0.1271 ns | 6.0750 ns |
| if4 | 6.2361 ns | 0.1501 ns | 0.2338 ns | 6.2479 ns |
| conditional4 | 5.5457 ns | 0.0675 ns | 0.0599 ns | 5.5537 ns |
| switchStatement5 | 7.0590 ns | 0.1593 ns | 0.1897 ns | 7.0144 ns |
| switchExpression5 | 6.9517 ns | 0.1623 ns | 0.2756 ns | 6.8837 ns |
| if5 | 8.8664 ns | 0.0877 ns | 0.0820 ns | 8.8887 ns |
| conditional5 | 7.8437 ns | 0.1637 ns | 0.1608 ns | 7.8131 ns |
| switchStatement10 | 15.2778 ns | 0.3325 ns | 0.3696 ns | 15.2038 ns |
| switchExpression10 | 17.0714 ns | 0.3612 ns | 0.5730 ns | 16.9284 ns |
| if10 | 28.8714 ns | 0.4889 ns | 0.5231 ns | 28.7261 ns |
| conditional10 | 16.4725 ns | 0.1321 ns | 0.1235 ns | 16.4475 ns |
| switchStatement100 | 143.5896 ns | 1.1010 ns | 0.9760 ns | 143.2851 ns |
| switchExpression100 | 157.8319 ns | 2.9648 ns | 2.3147 ns | 157.1144 ns |
| if100 | 1,788.5813 ns | 35.2708 ns | 39.2034 ns | 1,787.3701 ns |
| conditional100 | 701.0713 ns | 3.3936 ns | 3.1744 ns | 699.9504 ns |
| switchStatement1000 | 6,243.7404 ns | 126.9243 ns | 366.2056 ns | 6,067.1780 ns |
| switchExpression1000 | 4,642.0040 ns | 90.2316 ns | 96.5468 ns | 4,622.6555 ns |
| if1000 | 270,967.1061 ns | 2,022.8634 ns | 1,579.3187 ns | 271,108.5205 ns |
| conditional1000 | NA | NA | NA | NA |
Benchmarks with issues: BranchingTechniquesBenchmarks.conditional1000: DefaultJob