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Follow up on this stackoverflow question: https://stackoverflow.com/questions/53180372/fastest-way-to-concatenate-readonlyspanchar-in-c-sharp

Experiments to try to create a non-allocating StringBuilder that's as fast as possible.

The code in this repository is totally experimental and not well tested at all. Use at your own risk!

BenchmarkDotNet=v0.11.2, OS=Windows 10.0.17134.345 (1803/April2018Update/Redstone4)
Intel Core i5-2500K CPU 3.30GHz (Sandy Bridge), 1 CPU, 4 logical and 4 physical cores
.NET Core SDK=2.1.403
  [Host]     : .NET Core 2.1.5 (CoreCLR 4.6.26919.02, CoreFX 4.6.26919.02), 64bit RyuJIT
  DefaultJob : .NET Core 2.1.5 (CoreCLR 4.6.26919.02, CoreFX 4.6.26919.02), 64bit RyuJIT

Method Mean Error StdDev Gen 0/1k Op Gen 1/1k Op Gen 2/1k Op Allocated Memory/Op
ConcatSpansStringBuilderBenchmark 142.06 ns 2.8758 ns 4.2153 ns 0.0966 - - 304 B
ConcatSpansCopyToBenchmark 110.08 ns 2.8908 ns 8.3407 ns 0.0813 - - 256 B
ConcatSpansFastStringBuilderBenchmark 115.91 ns 2.3242 ns 2.5834 ns 0.0813 - - 256 B
ConcatSpansFastBufferStringBuilderBenchmark 94.12 ns 1.4318 ns 1.3393 ns 0.0407 - - 128 B
ConcatSpansFastUnsafeStringBuilderBenchmark 67.93 ns 0.7748 ns 0.6868 ns 0.0407 - - 128 B

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