This benchmark compares some patterns for comparing types for equality.
Currently, the JIT is not optimizing the generic methods in these
benchmarks without the [MethodImpl(MethodImplOptions.AggressiveInlining)]
attribute, but with the attribute they are optimized.
Although the cached version achieves similar performance as the inlined
methods without the need of [MethodImpl(MethodImplOptions.AggressiveInlining)]
it has memory overhead that the others do not.
BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18363.1139 (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-rc.2.20479.15
[Host] : .NET Core 5.0.0 (CoreCLR 5.0.20.47505, CoreFX 5.0.20.47505), X64 RyuJIT
DefaultJob : .NET Core 5.0.0 (CoreCLR 5.0.20.47505, CoreFX 5.0.20.47505), X64 RyuJIT
| Method | Mean | Error | StdDev |
|---|---|---|---|
| TypeOfEquals | 1.816 ns | 0.0550 ns | 0.0487 ns |
| TypeOfEqualsGeneric | 16.369 ns | 0.1464 ns | 0.1222 ns |
| TypeOfEqualsGenericInlined | 1.920 ns | 0.0667 ns | 0.1114 ns |
| StructWrappedIs | 16.188 ns | 0.1151 ns | 0.0961 ns |
| StructWrappedIsInlined | 1.954 ns | 0.0520 ns | 0.0461 ns |
| GetTypeEqualsGeneric | 36.403 ns | 0.5152 ns | 0.4820 ns |
| GetTypeEqualsGenericInlined | 16.548 ns | 0.2444 ns | 0.2286 ns |
| CachedTypeEquality | 1.936 ns | 0.0208 ns | 0.0185 ns |