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Martin Möhrmann 17d5cef257 reflect: reduce allocations for Select with up to 4 cases 
Allocate the runcases slice on the stack if the number
of select cases is small (up to 4).

Found while looking at production profiles of common
proto based RPC server framework code in Google which do
not have a large number of cases.

name      old time/op    new time/op    delta
Select/1     147ns ± 2%     120ns ± 6%  -18.32%  (p=0.000 n=7+10)
Select/4     316ns ± 5%     249ns ± 2%  -21.23%  (p=0.000 n=10+10)
Select/8     516ns ± 3%     515ns ± 3%     ~     (p=0.858 n=10+9)

name      old alloc/op   new alloc/op   delta
Select/1     96.0B ± 0%     64.0B ± 0%  -33.33%  (p=0.000 n=10+10)
Select/4      336B ± 0%      208B ± 0%  -38.10%  (p=0.000 n=10+10)
Select/8      672B ± 0%      672B ± 0%     ~     (all equal)

name      old allocs/op  new allocs/op  delta
Select/1      4.00 ± 0%      3.00 ± 0%  -25.00%  (p=0.000 n=10+10)
Select/4      7.00 ± 0%      6.00 ± 0%  -14.29%  (p=0.000 n=10+10)
Select/8      11.0 ± 0%      11.0 ± 0%     ~     (all equal)

Change-Id: I1687e74fc8e86606a27f03fa8a561bcfb68775d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/230657
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-28 21:08:32 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api all: remove scattered remnants of darwin/386 2020-04-08 18:37:38 +00:00
doc doc/go1.15: add notes for GOMODCACHE, modcacheunzipinplace 2020-04-28 17:17:53 +00:00
lib/time time/tzdata: new package 2020-04-14 19:34:31 +00:00
misc cmd/cgo: use consistent tag for a particular struct 2020-04-14 18:59:37 +00:00
src reflect: reduce allocations for Select with up to 4 cases 2020-04-28 21:08:32 +00:00
test cmd/compile: optimize Move with all-zero ro sym src to Zero 2020-04-24 23:58:10 +00:00
.gitattributes build: force all Windows batch files to CRLF 2020-03-22 08:42:38 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A: Qais Patankar (individual CLA) 2020-04-25 23:01:43 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Andy Pan (individual CLA) 2020-04-05 22:58:00 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
robots.txt
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

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