252ee90971
It appears that old code (from 2009) in xml.(*Decoder).rawToken replicates append's slice-growing functionality by allocating a new, bigger backing array and then calling copy. Simplifying the code by replacing it with a single append call does not seem to hurt performance: name old time/op new time/op delta Marshal-4 11.2µs ± 1% 11.3µs ±10% ~ (p=0.069 n=19+17) Unmarshal-4 28.6µs ± 1% 28.4µs ± 1% -0.60% (p=0.000 n=20+18) name old alloc/op new alloc/op delta Marshal-4 5.78kB ± 0% 5.78kB ± 0% ~ (all equal) Unmarshal-4 8.61kB ± 0% 8.27kB ± 0% -3.90% (p=0.000 n=20+20) name old allocs/op new allocs/op delta Marshal-4 23.0 ± 0% 23.0 ± 0% ~ (all equal) Unmarshal-4 189 ± 0% 190 ± 0% +0.53% (p=0.000 n=20+20) Change-Id: Ie580d1216a44760e611e63dee2c339af5465aea5 Reviewed-on: https://go-review.googlesource.com/86655 Reviewed-by: Daniel Martí <mvdan@mvdan.cc> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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