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08be63572e
The hash table implementation uses `& (h->size - 1)` to truncate
generated hashes to the number of buckets. This operation is equal to
`% h->size` if and only if the size is a power of two (which seems to be
always the case). One property of the binary and with a power of two
(and probably a small one <=2048) is all higher bits are discarded.
Thus a hash function is needed with a good avalanche effect, which the
current one is not.
Benchmark of building dssp5:
# Current
Time (mean ± σ): 1.347 s ± 0.065 s [User: 1.207 s, System: 0.138 s]
Range (min … max): 1.274 s … 1.436 s 10 runs
# Patch
Time (mean ± σ): 1.336 s ± 0.029 s [User: 1.195 s, System: 0.140 s]
Range (min … max): 1.303 s … 1.376 s 10 runs
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
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