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Span Memmove Benchmark
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using System; | |
using BenchmarkDotNet.Attributes; | |
using BenchmarkDotNet.Running; | |
public class Program | |
{ | |
static void Main(string[] args) | |
{ | |
BenchmarkRunner.Run<Program>(); | |
} | |
[Benchmark] | |
public void ArrayCopy() | |
{ | |
var array1 = "this is a test".ToCharArray(); | |
var array2 = new char[array1.Length]; | |
Array.Copy(array1, 0, array2, 0, array1.Length); | |
} | |
[Benchmark] | |
public void BufferBlockCopy() | |
{ | |
var array1 = "this is a test".ToCharArray(); | |
var array2 = new char[array1.Length]; | |
Buffer.BlockCopy(array1, 0, array2, 0, array1.Length); | |
} | |
[Benchmark] | |
public void SpanCopy() | |
{ | |
var array1 = "this is a test".AsSpan(); | |
var array2 = new char[array1.Length].AsSpan(); | |
Span.Copy(array1, 0, array2, 0, array1.Length); | |
} | |
[Benchmark] | |
public void SpanCopyStackAlloc() | |
{ | |
var array1 = "this is a test".AsSpan(); | |
Span<char> array2 = stackalloc char[array1.Length]; | |
Span.Copy(array1, 0, array2, 0, array1.Length); | |
} | |
} | |
public static class Span | |
{ | |
public static void Copy<T>(ReadOnlySpan<T> src, int sStart, Span<T> dest, int dStart, int len) | |
{ | |
if (dest.Length < src.Length) | |
{ | |
int i = 0; | |
while (len-- > 0 && dStart + i < dest.Length) | |
{ | |
dest[dStart + i] = src[sStart + i]; | |
i += 1; | |
} | |
} | |
else | |
{ | |
int lastS = sStart + (len - 1); | |
int lastD = dStart + (len - 1); | |
int i = 0; | |
while (len-- > 0) | |
{ | |
dest[lastD - i] = src[lastS - i]; | |
i += 1; | |
} | |
} | |
} | |
} |
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.NET Core 3.0
// * Summary *
BenchmarkDotNet=v0.11.5, OS=Windows 10.0.18362
Intel Core i7-6700K CPU 4.00GHz (Skylake), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=3.0.100
[Host] : .NET Core 3.0.0 (CoreCLR 4.700.19.46205, CoreFX 4.700.19.46214), 64bit RyuJIT
DefaultJob : .NET Core 3.0.0 (CoreCLR 4.700.19.46205, CoreFX 4.700.19.46214), 64bit RyuJIT