[corefoundation] Optimize `CFArray` (#12740)
The added test case has not shown any major performance enhancement,
anything (if) is lost in the noise.
Beside the performance the change has two small size advantages
* `Create` does not call another method (less metadata)
* `GetCount` is now the p/invoke `CFArrayGetCount`
Before
// * Summary *
BenchmarkDotNet=v0.12.1.1528-nightly, OS=macOS Big Sur 11.5.2 (20G95) [Darwin 20.6.0]
Intel Core i7-4790K CPU 4.00GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
[Host] : Mono 6.12.0 (2020-02/3cf59ad33da), X64
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=3
LaunchCount=1 WarmupCount=3
| Method | Length | Mean | Error | StdDev |
|------- |------- |------------:|------------:|----------:|
| Create | 0 | 255.4 ns | 53.68 ns | 2.94 ns |
| Create | 1 | 343.0 ns | 8.55 ns | 0.47 ns |
| Create | 16 | 443.8 ns | 30.54 ns | 1.67 ns |
| Create | 256 | 1,898.4 ns | 246.80 ns | 13.53 ns |
| Create | 4096 | 40,503.2 ns | 5,395.81 ns | 295.76 ns |
// * Legends *
Length : Value of the 'Length' parameter
Mean : Arithmetic mean of all measurements
Error : Half of 99.9% confidence interval
StdDev : Standard deviation of all measurements
1 ns : 1 Nanosecond (0.000000001 sec)
// ***** BenchmarkRunner: End *****
Global total time: 00:00:33 (33.26 sec), executed benchmarks: 5
After
// * Summary *
BenchmarkDotNet=v0.12.1.1528-nightly, OS=macOS Big Sur 11.5.2 (20G95) [Darwin 20.6.0]
Intel Core i7-4790K CPU 4.00GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
[Host] : Mono 6.12.0 (2020-02/3cf59ad33da), X64
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=3
LaunchCount=1 WarmupCount=3
| Method | Length | Mean | Error | StdDev |
|------- |------- |------------:|------------:|---------:|
| Create | 0 | 246.3 ns | 55.49 ns | 3.04 ns |
| Create | 1 | 341.1 ns | 18.13 ns | 0.99 ns |
| Create | 16 | 425.4 ns | 34.97 ns | 1.92 ns |
| Create | 256 | 1,741.1 ns | 298.87 ns | 16.38 ns |
| Create | 4096 | 40,333.6 ns | 1,646.70 ns | 90.26 ns |
// * Legends *
Length : Value of the 'Length' parameter
Mean : Arithmetic mean of all measurements
Error : Half of 99.9% confidence interval
StdDev : Standard deviation of all measurements
1 ns : 1 Nanosecond (0.000000001 sec)
// ***** BenchmarkRunner: End *****
Global total time: 00:00:31 (31.68 sec), executed benchmarks: 5
2691791ad2