/// <summary>
/// Returns a non-negative, random 64-bit integer
/// </summary>
/// <returns>A non-negative, random 64-bit integer</returns>
public ulong NextLong()
{
this.seed += WyCore.Prime0;
var result = WyCore.Mum(this.seed ^ WyCore.Prime1, this.seed);
return(result);
}
/// <summary>
/// Returns a non-negative, random 64-bit integer
/// </summary>
/// <returns>A non-negative, random 64-bit integer</returns>
public ulong NextLong()
{
this.seed += WyCore.Prime0;
this.seed = WyCore.Mum(this.seed ^ WyCore.Prime1, this.seed);
return(seed);
}
private static unsafe ulong WyHashCore(byte[] array, int ibStart, int cbSize, ulong seed)
{
fixed(byte *pData = array)
{
byte *ptr = pData;
var len = cbSize - ibStart;
var p = 0;
for (int i = ibStart; i + 32 <= len; i += 32, p += 32)
{
// Storing these in temp variables is slightly more performant (presumably it gives some kind of hint to the jitter)
var m1x = WyCore.Read64(ptr, p) ^ WyCore.Prime1;
var m1y = WyCore.Read64(ptr, p + 8) ^ WyCore.Prime2;
var m2x = WyCore.Read64(ptr, p + 16) ^ WyCore.Prime3;
var m2y = WyCore.Read64(ptr, p + 24) ^ WyCore.Prime4;
seed = WyCore.Mum(seed ^ WyCore.Prime0, WyCore.Mum(m1x, m1y) ^ WyCore.Mum(m2x, m2y));
}
seed ^= WyCore.Prime0;
// After the loop we have between 1 and 31 bytes left to process
switch (len & 31)
{
case 1:
seed = WyCore.Mum(seed, WyCore.Read8(ptr, p) ^ WyCore.Prime1);
break;
case 2:
seed = WyCore.Mum(seed, WyCore.Read16(ptr, p) ^ WyCore.Prime1);
break;
case 3:
seed = WyCore.Mum(seed, ((WyCore.Read16(ptr, p) << 8) | WyCore.Read8(ptr, p + 2)) ^ WyCore.Prime1);
break;
case 4:
seed = WyCore.Mum(seed, WyCore.Read32(ptr, p) ^ WyCore.Prime1);
break;
case 5:
seed = WyCore.Mum(seed, ((WyCore.Read32(ptr, p) << 8) | WyCore.Read8(ptr, p + 4)) ^ WyCore.Prime1);
break;
case 6:
seed = WyCore.Mum(seed, ((WyCore.Read32(ptr, p) << 16) | WyCore.Read16(ptr, p + 4)) ^ WyCore.Prime1);
break;
case 7:
seed = WyCore.Mum(seed, ((WyCore.Read32(ptr, p) << 24) | (WyCore.Read16(ptr, p + 4) << 8) | WyCore.Read8(ptr, p + 6)) ^ WyCore.Prime1);
break;
case 8:
seed = WyCore.Mum(seed, WyCore.Read64Swapped(ptr, p) ^ WyCore.Prime1);
break;
case 9:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read8(ptr, p + 8) ^ WyCore.Prime2);
break;
case 10:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read16(ptr, p + 8) ^ WyCore.Prime2);
break;
case 11:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, ((WyCore.Read16(ptr, p + 8) << 8) | WyCore.Read8(ptr, p + 10)) ^ WyCore.Prime2);
break;
case 12:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read32(ptr, p + 8) ^ WyCore.Prime2);
break;
case 13:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, ((WyCore.Read32(ptr, p + 8) << 8) | WyCore.Read8(ptr, p + 12)) ^ WyCore.Prime2);
break;
case 14:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, ((WyCore.Read32(ptr, p + 8) << 16) | WyCore.Read16(ptr, p + 12)) ^ WyCore.Prime2);
break;
case 15:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, ((WyCore.Read32(ptr, p + 8) << 24) | (WyCore.Read16(ptr, p + 12) << 8) | WyCore.Read8(ptr, p + 14)) ^ WyCore.Prime2);
break;
case 16:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2);
break;
case 17:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, WyCore.Read8(ptr, p + 16) ^ WyCore.Prime3);
break;
case 18:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, WyCore.Read16(ptr, p + 16) ^ WyCore.Prime3);
break;
case 19:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, ((WyCore.Read16(ptr, p + 16) << 8) | WyCore.Read8(ptr, p + 18)) ^ WyCore.Prime3);
break;
case 20:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, WyCore.Read32(ptr, p + 16) ^ WyCore.Prime3);
break;
case 21:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, ((WyCore.Read32(ptr, p + 16) << 8) | WyCore.Read8(ptr, p + 20)) ^ WyCore.Prime3);
break;
case 22:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, ((WyCore.Read32(ptr, p + 16) << 16) | WyCore.Read16(ptr, p + 20)) ^ WyCore.Prime3);
break;
case 23:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, ((WyCore.Read32(ptr, p + 16) << 24) | (WyCore.Read16(ptr, p + 20) << 8) | WyCore.Read8(ptr, p + 22)) ^ WyCore.Prime3);
break;
case 24:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(seed, WyCore.Read64Swapped(ptr, p + 16) ^ WyCore.Prime3);
break;
case 25:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, WyCore.Read8(ptr, p + 24) ^ WyCore.Prime4);
break;
case 26:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, WyCore.Read16(ptr, p + 24) ^ WyCore.Prime4);
break;
case 27:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, ((WyCore.Read16(ptr, p + 24) << 8) | WyCore.Read8(ptr, p + 26)) ^ WyCore.Prime4);
break;
case 28:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, WyCore.Read32(ptr, p + 24) ^ WyCore.Prime4);
break;
case 29:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, ((WyCore.Read32(ptr, p + 24) << 8) | WyCore.Read8(ptr, p + 28)) ^ WyCore.Prime4);
break;
case 30:
seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, ((WyCore.Read32(ptr, p + 24) << 16) | WyCore.Read16(ptr, p + 28)) ^ WyCore.Prime4);
break;
case 31: seed = WyCore.Mum(WyCore.Read64Swapped(ptr, p) ^ seed, WyCore.Read64Swapped(ptr, p + 8) ^ WyCore.Prime2) ^
WyCore.Mum(WyCore.Read64Swapped(ptr, p + 16) ^ seed, ((WyCore.Read32(ptr, p + 24) << 24) | (WyCore.Read16(ptr, p + 28) << 8) | WyCore.Read8(ptr, p + 30)) ^ WyCore.Prime4);
break;
}
}
return(seed);
}
private static ulong HashFinal(ulong seed, ulong length) => WyCore.Mum(seed, length ^ WyCore.Prime5);
