ca8354843e
Using Once.Do is now extremely cheap because the fast path is just an inlined atomic load of a variable that is written only once and a conditional jump. This is very beneficial for Once.Do because, due to its nature, the fast path will be used for every call after the first one. In a attempt to mimize code size increase, reorder the fields so that the pointer to Once is also the pointer to Once.done, that is the only field used in the hot path. This allows to use more compact instruction encodings or less instructions in the hot path (that is inlined at every callsite). name old time/op new time/op delta Once 4.54ns ± 0% 2.06ns ± 0% -54.59% (p=0.000 n=19+16) Once-4 1.18ns ± 0% 0.55ns ± 0% -53.39% (p=0.000 n=15+16) Once-16 0.53ns ± 0% 0.17ns ± 0% -67.92% (p=0.000 n=18+17) linux/amd64 bin/go 14675861 (previous commit 14663387, +12474/+0.09%) Change-Id: Ie2708103ab473787875d66746d2f20f1d90a6916 Reviewed-on: https://go-review.googlesource.com/c/go/+/152697 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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