// TODO: PERF make this do 3 blocks 8 bytes at once for better perf
// TODO: PERF use HashCode.Add not Combine
private static uint Crc32CElseHashCodeCombine(byte *first, nuint length)
{
uint value = ~0u;
var leadingBytes = MathHelpers.AlignUp(first, 8);
// handle leading bytes until 8 byte aligned
while (first < leadingBytes)
{
value = Hash(value, *first++);
length--;
}
ulong *pLong = (ulong *)first;
byte * last = first + length;
byte * alignedLast = first + MathHelpers.AlignDown(length, 8);
// handle main in 8 byte chunks until we can't anymore
ulong tmpValue = value;
while (pLong < alignedLast)
{
tmpValue = Hash8(tmpValue, *pLong++);
}
value = (uint)tmpValue;
// handle trailing
first = (byte *)pLong;
while (first < last)
{
value = Hash(value, *first++);
}
return(value);
