public void Combine()
{
int h1 = Hashing.CombineInline(1991, 13);
int h2 = Hashing.CombineInline(1991, 12);
Assert.NotEqual(h1, h2);
}
internal static uint CalculateHashForBits(BitVector vector, Hashing.Iterative.XXHash32Block state, int length = int.MaxValue, int lcp = int.MaxValue)
{
length = Math.Min(vector.Count, length); // Ensure we use the proper value.
int words = length / BitVector.BitsPerWord;
int remaining = length % BitVector.BitsPerWord;
ulong remainingWord = 0;
int shift = 0;
if (remaining != 0)
{
remainingWord = vector.GetWord(words); // Zero addressing ensures we get the next byte.
shift = BitVector.BitsPerWord - remaining;
}
unsafe
{
fixed(ulong *bitsPtr = vector.Bits)
{
uint hash = Hashing.Iterative.XXHash32.CalculateInline((byte *)bitsPtr, words * sizeof(ulong), state, lcp / BitVector.BitsPerByte);
remainingWord = ((remainingWord) >> shift) << shift;
ulong intermediate = Hashing.CombineInline(remainingWord, ((ulong)remaining) << 32 | (ulong)hash);
hash = (uint)intermediate ^ (uint)(intermediate >> 32);
return(hash);
}
}
}
