Better implementation of Num::add_assign. #13
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The original implementation of Num::add_assign had a few inefficiencies:
* It instantiated the standard hashmap with small keys.
* It put a bunch of items into an empty hashmap, without setting the
intial hashmap capacity.
* It used multiple hash lookups in an insert-or-modify pattern.
This commit:
* Uses the Fnv hash function instead of the default: SipHash.
* Initializes the hashmap with appropriate capacity.
* Uses the entry API.
In my microbenchmarks, this sped up Poseidon evaluation by 1.7x.
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The original implementation of Num::add_assign had a few inefficiencies:
intial hashmap capacity.
This commit:
In my microbenchmarks, this sped up Poseidon evaluation by 1.7x.