Certain algorithms require two independent hash functions. An optimization I've seen is to split the output of a wide hash function and use the parts instead of the two independent hash functions of shorter output.
For instance, double hashing is often used as a technique to compute the k independent indexes required by a Bloom filter rather than using k independent hashes, but this is often optimized to use a single wide hash and splitting its output. E.g., Google's Guava Bloom filter operates in this way using 128-bit Murmur3.
Alas, I've not been able to find any literature that addresses when it may be safe to do this. I.e., what properties should the wide hash function have for this to be acceptable? Is meeting the bit independence criterion sufficient?