private static ulong WyHashCore(byte[] array, int ibStart, int cbSize, ulong seed)
{
// We work a lot with 64-bit integers - reading ulongs from the source array using a cast span gives a big performance boost over BitConverter.ToUInt64
var span64 = MemoryMarshal.Cast <byte, ulong>(array);
var len = cbSize - ibStart;
var p = 0;
for (int i = ibStart; i + 32 <= len; i += 32, p += 32)
{
seed = SafeWyCore.Mum(seed ^ SafeWyCore.Prime0, SafeWyCore.Mum(SafeWyCore.Read64(span64, p) ^ SafeWyCore.Prime1, SafeWyCore.Read64(span64, p + 8) ^ SafeWyCore.Prime2) ^ SafeWyCore.Mum(SafeWyCore.Read64(span64, p + 16) ^ SafeWyCore.Prime3, SafeWyCore.Read64(span64, p + 24) ^ SafeWyCore.Prime4));
}
seed ^= SafeWyCore.Prime0;
switch (len & 31)
{
case 1:
seed = SafeWyCore.Mum(seed, SafeWyCore.Read8(array, p) ^ SafeWyCore.Prime1);
break;
case 2:
seed = SafeWyCore.Mum(seed, SafeWyCore.Read16(array, p) ^ SafeWyCore.Prime1);
break;
case 3:
seed = SafeWyCore.Mum(seed, ((SafeWyCore.Read16(array, p) << 8) | SafeWyCore.Read8(array, p + 2)) ^ SafeWyCore.Prime1);
break;
case 4:
seed = SafeWyCore.Mum(seed, SafeWyCore.Read32(array, p) ^ SafeWyCore.Prime1);
break;
case 5:
seed = SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p) << 8) | SafeWyCore.Read8(array, p + 4)) ^ SafeWyCore.Prime1);
break;
case 6:
seed = SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p) << 16) | SafeWyCore.Read16(array, p + 4)) ^ SafeWyCore.Prime1);
break;
case 7:
seed = SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p) << 24) | (SafeWyCore.Read16(array, p + 4) << 8) | SafeWyCore.Read8(array, p + 6)) ^ SafeWyCore.Prime1);
break;
case 8:
seed = SafeWyCore.Mum(seed, SafeWyCore.Read64Swapped(array, p) ^ SafeWyCore.Prime1);
break;
case 9:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read8(array, p + 8) ^ SafeWyCore.Prime2);
break;
case 10:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read16(array, p + 8) ^ SafeWyCore.Prime2);
break;
case 11:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, ((SafeWyCore.Read16(array, p + 8) << 8) | SafeWyCore.Read8(array, p + 10)) ^ SafeWyCore.Prime2);
break;
case 12:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read32(array, p + 8) ^ SafeWyCore.Prime2);
break;
case 13:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, ((SafeWyCore.Read32(array, p + 8) << 8) | SafeWyCore.Read8(array, p + 12)) ^ SafeWyCore.Prime2);
break;
case 14:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, ((SafeWyCore.Read32(array, p + 8) << 16) | SafeWyCore.Read16(array, p + 12)) ^ SafeWyCore.Prime2);
break;
case 15:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, ((SafeWyCore.Read32(array, p + 8) << 24) | (SafeWyCore.Read16(array, p + 12) << 8) | SafeWyCore.Read8(array, p + 14)) ^ SafeWyCore.Prime2);
break;
case 16:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2);
break;
case 17:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, SafeWyCore.Read8(array, p + 16) ^ SafeWyCore.Prime3);
break;
case 18:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, SafeWyCore.Read16(array, p + 16) ^ SafeWyCore.Prime3);
break;
case 19:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, ((SafeWyCore.Read16(array, p + 16) << 8) | SafeWyCore.Read8(array, p + 18)) ^ SafeWyCore.Prime3);
break;
case 20:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, SafeWyCore.Read32(array, p + 16) ^ SafeWyCore.Prime3);
break;
case 21:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p + 16) << 8) | SafeWyCore.Read8(array, p + 20)) ^ SafeWyCore.Prime3);
break;
case 22:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p + 16) << 16) | SafeWyCore.Read16(array, p + 20)) ^ SafeWyCore.Prime3);
break;
case 23:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, ((SafeWyCore.Read32(array, p + 16) << 24) | (SafeWyCore.Read16(array, p + 20) << 8) | SafeWyCore.Read8(array, p + 22)) ^ SafeWyCore.Prime3);
break;
case 24:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(seed, SafeWyCore.Read64Swapped(array, p + 16) ^ SafeWyCore.Prime3);
break;
case 25:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, SafeWyCore.Read8(array, p + 24) ^ SafeWyCore.Prime4);
break;
case 26:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, SafeWyCore.Read16(array, p + 24) ^ SafeWyCore.Prime4);
break;
case 27:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, ((SafeWyCore.Read16(array, p + 24) << 8) | SafeWyCore.Read8(array, p + 26)) ^ SafeWyCore.Prime4);
break;
case 28:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, SafeWyCore.Read32(array, p + 24) ^ SafeWyCore.Prime4);
break;
case 29:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, ((SafeWyCore.Read32(array, p + 24) << 8) | SafeWyCore.Read8(array, p + 28)) ^ SafeWyCore.Prime4);
break;
case 30:
seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, ((SafeWyCore.Read32(array, p + 24) << 16) | SafeWyCore.Read16(array, p + 28)) ^ SafeWyCore.Prime4);
break;
case 31: seed = SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p) ^ seed, SafeWyCore.Read64Swapped(array, p + 8) ^ SafeWyCore.Prime2) ^
SafeWyCore.Mum(SafeWyCore.Read64Swapped(array, p + 16) ^ seed, ((SafeWyCore.Read32(array, p + 24) << 24) | (SafeWyCore.Read16(array, p + 28) << 8) | SafeWyCore.Read8(array, p + 30)) ^ SafeWyCore.Prime4);
break;
}
return(seed);
}
private static ulong HashFinal(ulong seed, ulong length) => SafeWyCore.Mum(seed, length ^ SafeWyCore.Prime5);