hash: replace modulus with mask.

In most places in the hash module, we reduce a hash
code into the power-of-two sized table using
h & (hash->modulus - 1). In some places we wastefully
modulo operation h % hash->modulus. Why don't we
replace the modulus with a mask so we can just do
h & hash->mask.

* hash.c (struct hash_ops): Replace modulus member with
mask, which has a value one less.
(hash_mark, hash_grow, do_make_hash, make_similar_hash,
copy_hash, gethash_c, gethash_e, remhash, clearhash,
hash_iter_next_impl, hash_iter_peek, do_weak_tables):
Work with mask rather than modulus, preserving existing
behavior.

0 files changed, 0 insertions, 0 deletions