The current implementations of MarshalJSON and MarshalText use
time.Format which returns a string (converted from a byte slice),
only to convert it back to a byte slice.
Avoid the conversion (and thus an allocation) by directly appending
the formatted time to a preallocated byte slice, using the new
AppendFormat function, introduced in golang.org/cl/1760.
This reduces the allocations done in Marshal[Text|JSON] by 50%.
benchmark old ns/op new ns/op delta
BenchmarkMarshalJSON 626 507 -19.01%
BenchmarkMarshalText 598 511 -14.55%
benchmark old allocs new allocs delta
BenchmarkMarshalJSON 2 1 -50.00%
BenchmarkMarshalText 2 1 -50.00%
benchmark old bytes new bytes delta
BenchmarkMarshalJSON 96 48 -50.00%
BenchmarkMarshalText 96 48 -50.00%
Fixes#11025
Change-Id: I468f78d075a6ecc1cdc839df7fb407fbc6ff2e70
Reviewed-on: https://go-review.googlesource.com/10555
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It's easy for someone who wants a time bigger than any
valid time to reach for time.Unix(1<<63-1, 0), so it
makes sense to explicit say such value is not valid.
Fixes#10906 (again).
Change-Id: If71e32472ae40d86c30e629b982406040a73c4c7
Reviewed-on: https://go-review.googlesource.com/10266
Reviewed-by: Russ Cox <rsc@golang.org>
