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98b6c6aca6
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Cuong Manh Le 98b6c6aca6 cmd/compile: do not allocate bucket for non-escaping map 
For map with hint larger than BUCKETSIZE, makemap ignore allocated
bucket and allocate buckets itself. So do not allocate bucket in
this case, save us the cost of zeroing+assignment to the bucket.

name                            old time/op    new time/op    delta
NewEmptyMap-12                    3.89ns ± 4%    3.88ns ± 2%    ~     (p=0.939 n=19+20)
NewSmallMap-12                    23.3ns ± 3%    23.1ns ± 2%    ~     (p=0.307 n=18+17)
NewEmptyMapHintLessThan8-12       6.43ns ± 3%    6.31ns ± 2%  -1.72%  (p=0.000 n=19+18)
NewEmptyMapHintGreaterThan8-12     159ns ± 2%     150ns ± 1%  -5.79%  (p=0.000 n=20+18)

Benchmark run with commit ab7c174 reverted, see #38314.

Fixes #20184

Change-Id: Ic021f57454c3a0dd50601d73bbd77b8faf8d93b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/227458
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-09 03:18:43 +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: remove darwin/386, darwin/arm from ports list 2020-04-08 18:35:03 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc all: remove scattered remnants of darwin/386 2020-04-08 18:37:38 +00:00
src cmd/compile: do not allocate bucket for non-escaping map 2020-04-09 03:18:43 +00:00
test cmd/compile: handle some additional phis in shortcircuit 2020-04-08 22:13:38 +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+C: add Andy Pan (individual CLA) 2020-04-05 22:58:00 +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
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LICENSE
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

The Go Programming Language

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