src/it/unimi/dsi/fastutil/HashCommon.java
public static long murmurHash3(long x) {
		x ^= x >>> 33;
		x *= 0xff51afd7ed558ccdL;
		x ^= x >>> 33;
		x *= 0xc4ceb9fe1a85ec53L;
		x ^= x >>> 33;
		return x;
	}
public static long murmurHash3(long x) {
		x ^= x >>> 33;
		x *= 0xff51afd7ed558ccdL;
		x ^= x >>> 33;
		x *= 0xc4ceb9fe1a85ec53L;
		x ^= x >>> 33;
		return x;
	}
Avalanches the bits of a long integer by applying the finalisation step of MurmurHash3.

<p>This method implements the finalisation step of Austin Appleby's <a href="http://code.google.com/p/smhasher/">MurmurHash3</a>.
Its purpose is to avalanche the bits of the argument to within 0.25% bias.

@param x a long integer.
@return a hash value with good avalanching properties.