Use staticbytes instead.
Instrumenting make.bash shows approx 0.5%
of all slicebytetostrings have a buffer of length 1.
name old time/op new time/op delta
SliceByteToString/1-8 14.1ns ± 1% 4.1ns ± 1% -71.13% (p=0.000 n=17+20)
SliceByteToString/2-8 15.5ns ± 2% 15.5ns ± 1% ~ (p=0.061 n=20+18)
SliceByteToString/4-8 14.9ns ± 1% 15.0ns ± 2% +1.25% (p=0.000 n=20+20)
SliceByteToString/8-8 17.1ns ± 1% 17.5ns ± 1% +2.16% (p=0.000 n=19+19)
SliceByteToString/16-8 23.6ns ± 1% 23.9ns ± 1% +1.41% (p=0.000 n=20+18)
SliceByteToString/32-8 26.0ns ± 1% 25.8ns ± 0% -1.05% (p=0.000 n=19+16)
SliceByteToString/64-8 30.0ns ± 0% 30.2ns ± 0% +0.56% (p=0.000 n=16+18)
SliceByteToString/128-8 38.9ns ± 0% 39.0ns ± 0% +0.23% (p=0.019 n=19+15)
Fixes #24172
Change-Id: I3dfa14eefbf9fb4387114e20c9cb40e186abe962
Reviewed-on: https://go-review.googlesource.com/97717
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
if msanenabled {
msanread(unsafe.Pointer(&b[0]), uintptr(l))
}
+ if l == 1 {
+ stringStructOf(&str).str = unsafe.Pointer(&staticbytes[b[0]])
+ stringStructOf(&str).len = 1
+ return
+ }
var p unsafe.Pointer
if buf != nil && len(b) <= len(buf) {