1ab6b790be
If a struct or array is comparable, then we can leverage rtype.equal, which is almost always faster than what Go reflection can achieve. As a secondary optimization, pre-compute Value.Len and Value.NumField outside of the loop conditional. Performance: name old time/op new time/op delta IsZero/ArrayComparable 136ns ± 4% 16ns ± 1% -88.28% (p=0.008 n=5+5) IsZero/ArrayIncomparable 197ns ±10% 123ns ± 1% -37.74% (p=0.008 n=5+5) IsZero/StructComparable 26.4ns ± 0% 9.6ns ± 1% -63.68% (p=0.016 n=4+5) IsZero/StructIncomparable 43.5ns ± 1% 27.8ns ± 1% -36.21% (p=0.008 n=5+5) The incomparable types gain a performance boost since they are generally constructed from nested comparable types. Change-Id: If2c1929f8bb1b5b19306ef0c69f3c95a27d4b60d Reviewed-on: https://go-review.googlesource.com/c/go/+/411478 Reviewed-by: Dan Kortschak <dan@kortschak.io> Run-TryBot: Joseph Tsai <joetsai@digital-static.net> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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The Go Programming Language
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