Dominik Honnef
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ad2b6ded3b
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Use bits.OnesCount64 when available
Benchmark on i7-2600k, which has the POPCNT instruction:
name old time/op new time/op delta
DistanceIdentical-8 5.08ns ± 0% 1.01ns ± 1% -80.07% (p=0.008 n=5+5)
DistanceDifferent-8 81.5ns ± 2% 1.0ns ± 0% -98.76% (p=0.016 n=5+4)
Benchmark on Cavium Octeon, a MIPS64 platform with no dedicated
instruction:
name old time/op new time/op delta
DistanceIdentical-2 120ns ± 6% 144ns ± 5% +19.93% (p=0.008 n=5+5)
DistanceDifferent-2 656ns ± 4% 144ns ± 4% -78.09% (p=0.008 n=5+5)
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2018-05-02 23:52:38 +09:00 |
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