encoding/gob: speedup floats encoding and decoding
By replacing bytes-reversing routines with bits.ReverseBytes64 calls.
name old time/op new time/op delta
EncodeComplex128Slice-4 35.1µs ± 1% 23.2µs ± 2% -33.94% (p=0.000 n=20+20)
EncodeFloat64Slice-4 17.9µs ± 1% 11.0µs ± 1% -38.36% (p=0.000 n=17+18)
name old time/op new time/op delta
DecodeComplex128Slice-4 79.7µs ± 0% 69.9µs ± 1% -12.31% (p=0.000 n=20+20)
DecodeFloat64Slice-4 47.3µs ± 1% 42.2µs ± 1% -10.65% (p=0.000 n=17+17)
Change-Id: I91a6401c6009b5712fca6258dd1e57c6fe68ea64
Reviewed-on: https://go-review.googlesource.com/38352
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>