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The Go programming language
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Carlo Alberto Ferraris ad7db1f90f sync: avoid a dynamic check in WaitGroup on 64-bit architectures 
uint64 is guaranteed by the compiler to be aligned on 64-bit archs.
By using uint64+uint32 instead of [3]uint32 we can make use of the
guaranteed alignment to avoid the run-time alignment check.

On linux/amd64:

name                     old time/op    new time/op    delta
WaitGroupUncontended-4     8.84ns ± 3%    7.62ns ± 4%  -13.72%  (p=0.000 n=17+18)
WaitGroupAddDone-4         66.8ns ± 3%    45.9ns ± 2%  -31.31%  (p=0.000 n=20+18)
WaitGroupAddDoneWork-4     79.2ns ± 1%    56.6ns ± 1%  -28.54%  (p=0.000 n=17+20)
WaitGroupWait-4            2.83ns ± 2%    2.58ns ± 2%   -9.05%  (p=0.000 n=18+20)
WaitGroupWaitWork-4        16.8ns ± 6%    16.5ns ± 6%     ~     (p=0.072 n=20+18)
WaitGroupActuallyWait-4     263ns ± 2%     261ns ± 5%     ~     (p=0.063 n=18+20)

Change-Id: I314340f2ed8a47d8b9c15f8a3b07e41f252f4831
Reviewed-on: https://go-review.googlesource.com/c/go/+/189837
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-10-19 18:21:38 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/go: stamp VCS revision and uncommitted status into binaries 2021-10-14 18:44:37 +00:00
doc doc/go1.18: add release notes for build and VCS info 2021-10-15 20:29:48 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc misc/wasm: expect environment to provide polyfills 2021-10-16 14:50:21 +00:00
src sync: avoid a dynamic check in WaitGroup on 64-bit architectures 2021-10-19 18:21:38 +00:00
test cmd/compile, types2: better error message for invalid type assertion 2021-10-19 17:01:35 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
LICENSE
PATENTS
README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.