Ahasher2

Benchmark/BenchmarkAHash.cs

@@ -1,6 +1,9 @@
 using BenchmarkDotNet.Attributes;
 using BenchmarkDotNet.Diagnostics.Windows.Configs;
 using BetterCollections.Cryptography;
+#if NET8_0_OR_GREATER
+using BetterCollections.Cryptography.AHasherImpl;
+#endif
 
 namespace Benchmark;
 
@@ -9,19 +12,45 @@ namespace Benchmark;
 [DisassemblyDiagnoser]
 public class BenchmarkAHash
 {
-    private readonly AHasher AHasher = new();
+    private readonly AHasherLegacy aHasherLegacy = new();
 
     [Benchmark]
     public ulong AHash()
     {
         var r = 0ul;
         for (int i = 0; i < 1000; i++)
         {
-            r += AHasher.Hash((ulong)i);
+            r += aHasherLegacy.Hash((ulong)i);
         }
         return r;
     }
 
+#if NET8_0_OR_GREATER
+    [Benchmark]
+    public int AHash2()
+    {
+        var r = 0;
+        for (int i = 0; i < 1000; i++)
+        {
+            r += AHasher.Combine(i);
+        }
+        return r;
+    }
+
+    [Benchmark]
+    public int AHash3()
+    {
+        var r = 0;
+        for (int i = 0; i < 1000; i++)
+        {
+            var hasher = AesHasher.Create(AHasher.GlobalRandomState);
+            hasher = AesHasher.Add(hasher, i);
+            r += AesHasher.ToHashCode(hasher);
+        }
+        return r;
+    }
+#endif
+
     [Benchmark(Baseline = true)]
     public int HashCodeCombine()
     {

Benchmark/BenchmarkAHashString.cs

@@ -0,0 +1,58 @@
+using System.Runtime.InteropServices;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Diagnostics.Windows.Configs;
+using BetterCollections.Cryptography;
+#if NET8_0_OR_GREATER
+using BetterCollections.Cryptography.AHasherImpl;
+#endif
+
+namespace Benchmark;
+
+[MemoryDiagnoser]
+[JitStatsDiagnoser]
+[DisassemblyDiagnoser]
+public class BenchmarkAHashString
+{
+    [Params("asd", "1234567890", "1234567890_1234567890_1234567890_1234567890",
+        "1234567890_1234567890_1234567890_1234567890_1234567890_1234567890_1234567890_1234567890")]
+    public string Str;
+
+#if NET8_0_OR_GREATER
+    [Benchmark]
+    public int AHash_AddString_1()
+    {
+        var hasher = AHasher.Global;
+        hasher.AddString(Str);
+        return hasher.ToHashCode();
+    }
+
+    [Benchmark]
+    public int AHash_AddString_2()
+    {
+        var hasher = AesHasher.Create(AHasher.GlobalRandomState);
+        hasher = AesHasher.AddString(hasher, Str);
+        return AesHasher.ToHashCode(hasher);
+    }
+
+    [Benchmark]
+    public int Soft_AddString1()
+    {
+        var r = 0;
+        for (int i = 0; i < 1000; i++)
+        {
+            var hasher = SoftHasher.Create(AHasher.GlobalRandomState);
+            hasher = SoftHasher.AddString(hasher, Str);
+            r += SoftHasher.ToHashCode(hasher);
+        }
+        return r;
+    }
+#endif
+
+    [Benchmark(Baseline = true)]
+    public int HashCode_AddBytes()
+    {
+        var hasher = new HashCode();
+        hasher.AddBytes(MemoryMarshal.AsBytes(Str.AsSpan()));
+        return hasher.ToHashCode();
+    }
+}

BetterCollections/Cryptography/AHasher/AHasher.cs

@@ -0,0 +1,216 @@
+#if NET8_0_OR_GREATER
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using BetterCollections.Cryptography.AHasherImpl;
+
+namespace BetterCollections.Cryptography;
+
+// reference https://github.com/tkaitchuck/aHash/tree/master
+
+/// <summary>
+/// A hasher that ensures even distribution of each bit
+/// <para>If possible use Aes SIMD acceleration (.net7+)</para>
+/// </summary>
+public struct AHasher : IHasher
+{
+    #region GlobalRandomState
+
+    public static AHasherRandomState GlobalRandomState
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+        get => _globalRandomState;
+    }
+
+    public static readonly AHasherRandomState _globalRandomState = GenerateRandomState();
+
+    [ThreadStatic]
+    private static AHasherRandomState _threadCurrentRandomState;
+    [ThreadStatic]
+    private static bool _threadCurrentHas;
+
+    public static AHasherRandomState ThreadCurrentRandomState
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+        get
+        {
+            if (!_threadCurrentHas)
+            {
+                _threadCurrentRandomState = GenerateRandomState();
+                _threadCurrentHas = true;
+            }
+            return _threadCurrentRandomState;
+        }
+    }
+
+    #endregion
+
+    #region RandomState
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static AHasherRandomState GenerateRandomState()
+    {
+        var rand = Random.Shared;
+        Unsafe.SkipInit(out AHasherRandomState state);
+        rand.NextBytes(MemoryMarshal.Cast<ulong, byte>(state.UnsafeAsMutableSpan()));
+        return state;
+    }
+
+    #endregion
+
+
+    #region Create
+
+    public static AHasher Global
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+        get;
+    } = new(GlobalRandomState);
+
+    public static AHasher ThreadCurrent
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+        get;
+    } = new(ThreadCurrentRandomState);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static AHasher CreateRandom() => new(GenerateRandomState());
+
+    #endregion
+
+    #region Impl
+
+    private AHasher2Data data;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public AHasher(AHasherRandomState randomState)
+    {
+        Unsafe.SkipInit(out this);
+        data = AesHasher.IsSupported ? AesHasher.Create(randomState) : SoftHasher.Create(randomState);
+    }
+
+    #region IHasher
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void Add(int value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.Add(data, value) : SoftHasher.Add(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void Add(long value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.Add(data, value) : SoftHasher.Add(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void Add<T>(T value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.Add(data, value) : SoftHasher.Add(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void Add<T>(T value, IEqualityComparer<T>? comparer)
+    {
+        data = AesHasher.IsSupported ? AesHasher.Add(data, value, comparer) : SoftHasher.Add(data, value, comparer);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void AddBytes(ReadOnlySpan<byte> value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.AddBytes(data, value) : SoftHasher.AddBytes(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void AddString(ReadOnlySpan<byte> value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.AddString(data, value) : SoftHasher.AddString(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public void AddString(ReadOnlySpan<char> value)
+    {
+        data = AesHasher.IsSupported ? AesHasher.AddString(data, value) : SoftHasher.AddString(data, value);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public int ToHashCode() =>
+        AesHasher.IsSupported ? AesHasher.ToHashCode(data) : SoftHasher.ToHashCode(data);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public long ToHashCodeLong() =>
+        AesHasher.IsSupported ? AesHasher.ToHashCodeLong(data) : SoftHasher.ToHashCodeLong(data);
+
+    #endregion
+
+    #endregion
+
+    #region Combine
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1>(T1 value1)
+    {
+        return AesHasher.IsSupported ? AesHasher.Combine(value1) : SoftHasher.Combine(value1);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2>(T1 value1, T2 value2)
+    {
+        return AesHasher.IsSupported ? AesHasher.Combine(value1, value2) : SoftHasher.Combine(value1, value2);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3>(T1 value1, T2 value2, T3 value3)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3)
+            : SoftHasher.Combine(value1, value2, value3);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3, T4>(T1 value1, T2 value2, T3 value3, T4 value4)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3, value4)
+            : SoftHasher.Combine(value1, value2, value3, value4);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3, T4, T5>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3, value4, value5)
+            : SoftHasher.Combine(value1, value2, value3, value4, value5);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3, T4, T5, T6>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5, T6 value6)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3, value4, value5, value6)
+            : SoftHasher.Combine(value1, value2, value3, value4, value5, value6);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3, T4, T5, T6, T7>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5,
+        T6 value6, T7 value7)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3, value4, value5, value6, value7)
+            : SoftHasher.Combine(value1, value2, value3, value4, value5, value6, value7);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining), SkipLocalsInit]
+    public static int Combine<T1, T2, T3, T4, T5, T6, T7, T8>(T1 value1, T2 value2, T3 value3, T4 value4, T5 value5,
+        T6 value6, T7 value7, T8 value8)
+    {
+        return AesHasher.IsSupported
+            ? AesHasher.Combine(value1, value2, value3, value4, value5, value6, value7, value8)
+            : SoftHasher.Combine(value1, value2, value3, value4, value5, value6, value7, value8);
+    }
+
+    #endregion
+}
+
+#endif