The idea is to avoid boxing and instead use a 16 byte struct for each value.
Unfortunately (?) .NET doesn't allow overlapping value type fields and reference type fields.
Platform:
BenchmarkDotNet v0.13.11, Ubuntu 20.04.6 LTS (Focal Fossa)
Intel Core i7-5600U CPU 2.60GHz (Broadwell), 1 CPU, 4 logical and 2 physical cores
.NET SDK 6.0.414
[Host] : .NET 6.0.22 (6.0.2223.42425), X64 RyuJIT AVX2
DefaultJob : .NET 6.0.22 (6.0.2223.42425), X64 RyuJIT AVX2
| Method | PDouble | PLong | Mean | Error | StdDev | Median | Ratio | RatioSD | Gen0 | Allocated | Alloc Ratio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Unboxing | 10 | 10 | 109.3 ms | 2.18 ms | 5.93 ms | 109.0 ms | 1.00 | 0.08 | 9400.0000 | 18.78 MB | 0.80 |
| Boxing | 10 | 10 | 109.1 ms | 2.18 ms | 6.07 ms | 106.9 ms | 1.00 | 0.00 | 11600.0000 | 23.45 MB | 1.00 |
| Unboxing | 10 | 25 | 104.1 ms | 0.18 ms | 0.15 ms | 104.0 ms | 0.97 | 0.01 | 7600.0000 | 15.25 MB | 0.65 |
| Boxing | 10 | 25 | 107.3 ms | 0.57 ms | 0.53 ms | 107.4 ms | 1.00 | 0.00 | 11600.0000 | 23.45 MB | 1.00 |
| Unboxing | 10 | 50 | 105.5 ms | 0.83 ms | 0.77 ms | 105.6 ms | 0.92 | 0.01 | 4600.0000 | 9.39 MB | 0.40 |
| Boxing | 10 | 50 | 115.2 ms | 0.42 ms | 0.37 ms | 115.2 ms | 1.00 | 0.00 | 11600.0000 | 23.45 MB | 1.00 |
| Unboxing | 25 | 10 | 101.5 ms | 0.41 ms | 0.34 ms | 101.6 ms | 0.96 | 0.01 | 7600.0000 | 15.25 MB | 0.65 |
| Boxing | 25 | 10 | 105.8 ms | 0.97 ms | 0.86 ms | 105.4 ms | 1.00 | 0.00 | 11600.0000 | 23.45 MB | 1.00 |
| Unboxing | 25 | 25 | 103.6 ms | 0.36 ms | 0.30 ms | 103.7 ms | 0.73 | 0.02 | 5800.0000 | 11.74 MB | 0.50 |
| Boxing | 25 | 25 | 141.5 ms | 2.71 ms | 4.53 ms | 143.3 ms | 1.00 | 0.00 | 11750.0000 | 23.45 MB | 1.00 |
| Unboxing | 25 | 50 | 103.8 ms | 0.58 ms | 0.51 ms | 103.7 ms | 0.95 | 0.01 | 2800.0000 | 5.89 MB | 0.25 |
| Boxing | 25 | 50 | 109.7 ms | 0.80 ms | 0.75 ms | 109.4 ms | 1.00 | 0.00 | 11600.0000 | 23.45 MB | 1.00 |