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286c7ae10c
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Martin Möhrmann 286c7ae10c runtime: use multiplication with overflow check for makechan 
This improves performance for channels with an element size
larger than 32 bytes and removes loading a value from the
maxElems array for smaller element sizes.

MakeChan/Byte       88.8ns ± 6%  85.2ns ± 1%  -4.03%  (p=0.000 n=10+10)
MakeChan/Int         100ns ± 4%    96ns ± 2%  -3.72%  (p=0.000 n=9+10)
MakeChan/Ptr         124ns ± 3%   126ns ± 2%    ~     (p=0.068 n=10+10)
MakeChan/Struct/0   80.5ns ± 2%  80.7ns ± 2%    ~     (p=0.697 n=10+10)
MakeChan/Struct/32   143ns ± 4%   141ns ± 2%    ~     (p=0.221 n=10+10)
MakeChan/Struct/40   169ns ± 2%   159ns ± 4%  -6.26%  (p=0.000 n=10+10)

Updates #21588

Change-Id: Ifbf12a5af2f0ec7e1d2241ecfffab020e9abec48
Reviewed-on: https://go-review.googlesource.com/c/144017
Reviewed-by: Keith Randall <khr@golang.org>
2018-10-23 16:42:58 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: FreeBSD 12 ino64 support 2018-10-05 21:38:13 +00:00
doc doc: use the new log functions 2018-10-22 19:57:05 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc internal/traceparser: provide parser that uses less space and parses segments of runtime trace files 2018-10-23 14:00:14 +00:00
src runtime: use multiplication with overflow check for makechan 2018-10-23 16:42:58 +00:00
test cmd/compile: use proved bounds to remove signed division fix-ups 2018-10-23 02:29:44 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
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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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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

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.