From 293b65a8562fe5cbb465ebdfd3600c84be990740 Mon Sep 17 00:00:00 2001
From: Timothy Schenk <admin@rainote.dev>
Date: Mon, 13 Nov 2023 19:32:47 +0100
Subject: [PATCH] feat: add benchmark for writing to span/array of bytes

---
 Benchmarks/BinaryConversionBenchmarks.cs | 29 ++++++++++++++++++++++--
 Benchmarks/GenericConfig.cs              |  7 ------
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/Benchmarks/BinaryConversionBenchmarks.cs b/Benchmarks/BinaryConversionBenchmarks.cs
index 3252171..ff14eee 100644
--- a/Benchmarks/BinaryConversionBenchmarks.cs
+++ b/Benchmarks/BinaryConversionBenchmarks.cs
@@ -10,16 +10,18 @@ public class BinaryConversionBenchmarks
 {
     private byte[] _data = null!;
     private int _offset;
+    private int _writeBuffer;
 
     [GlobalSetup]
     public void Setup()
     {
         this._data = RandomNumberGenerator.GetBytes(4000);
         this._offset = RandomNumberGenerator.GetInt32(0, 3500);
+        this._writeBuffer = RandomNumberGenerator.GetInt32(int.MinValue, int.MaxValue);
     }
 
     [Benchmark]
-    public short BitConverterTest() => BitConverter.ToInt16(this._data, this._offset);
+    public short BitConverterParseTest() => BitConverter.ToInt16(this._data, this._offset);
 
     [Benchmark]
     public short BinaryReader()
@@ -31,7 +33,30 @@ public class BinaryConversionBenchmarks
     }
 
     [Benchmark]
-    public short BinaryPrimitives() =>
+    public short BinaryPrimitivesRead() =>
         System.Buffers.Binary.BinaryPrimitives.ReadInt16LittleEndian(
             new ArraySegment<byte>(this._data, this._offset, sizeof(short)));
+
+    [Benchmark]
+    public void BinaryPrimitivesWrite()
+    {
+        System.Buffers.Binary.BinaryPrimitives.WriteInt32LittleEndian(this._data.AsSpan(_offset, 4),
+            this._writeBuffer);
+    }
+
+    [Benchmark]
+    public void BitConverterCopy()
+    {
+        BitConverter.GetBytes(this._writeBuffer).CopyTo(this._data, this._offset);
+    }
+
+    [Benchmark]
+    public void BitConverterAssignment()
+    {
+        var bytes = BitConverter.GetBytes(this._writeBuffer);
+        this._data[this._offset] = bytes[0];
+        this._data[this._offset + 1] = bytes[1];
+        this._data[this._offset + 2] = bytes[2];
+        this._data[this._offset + 3] = bytes[3];
+    }
 }
diff --git a/Benchmarks/GenericConfig.cs b/Benchmarks/GenericConfig.cs
index 0dd812e..903dbf4 100644
--- a/Benchmarks/GenericConfig.cs
+++ b/Benchmarks/GenericConfig.cs
@@ -27,12 +27,5 @@ public class GenericConfig : ManualConfig
             .AddAnalyser(MinIterationTimeAnalyser.Default, OutliersAnalyser.Default,
                 RuntimeErrorAnalyser.Default, EnvironmentAnalyser.Default)
             .AddColumn(RankColumn.Arabic).AddExporter(CsvExporter.Default, MarkdownExporter.Default);
-        AddJob(Job.Default
-                .WithRuntime(CoreRuntime.Core60))
-            .AddDiagnoser(ThreadingDiagnoser.Default, MemoryDiagnoser.Default,
-                EventPipeProfiler.Default)
-            .AddAnalyser(MinIterationTimeAnalyser.Default, OutliersAnalyser.Default,
-                RuntimeErrorAnalyser.Default, EnvironmentAnalyser.Default)
-            .AddColumn(RankColumn.Arabic).AddExporter(CsvExporter.Default, MarkdownExporter.Default);
     }
 }