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Russ Cox 653d56075d cmd/internal/gc: inline writeBarrierEnabled check before calling writebarrierptr 
I believe the benchmarks that get slower are under register pressure,
and not making the call unconditionally makes the pressure worse,
and the register allocator doesn't do a great job. But part of the point
of this sequence is to get the write barriers out of the way so I can work
on the register allocator, so that's okay.

name                                       old                     new          delta
BenchmarkBinaryTree17              17.9s × (1.00,1.01)     18.0s × (0.99,1.01)  ~
BenchmarkFannkuch11                4.43s × (1.00,1.00)     4.43s × (1.00,1.00)  ~
BenchmarkFmtFprintfEmpty           110ns × (1.00,1.06)     114ns × (0.95,1.05)  ~
BenchmarkFmtFprintfString          487ns × (0.99,1.00)     468ns × (0.99,1.01)  -4.00%
BenchmarkFmtFprintfInt             450ns × (0.99,1.00)     433ns × (1.00,1.01)  -3.88%
BenchmarkFmtFprintfIntInt          762ns × (1.00,1.00)     748ns × (0.99,1.01)  -1.84%
BenchmarkFmtFprintfPrefixedInt     584ns × (0.99,1.01)     547ns × (0.99,1.01)  -6.26%
BenchmarkFmtFprintfFloat           738ns × (1.00,1.00)     756ns × (1.00,1.01)  +2.37%
BenchmarkFmtManyArgs              2.80µs × (1.00,1.01)    2.79µs × (1.00,1.01)  ~
BenchmarkGobDecode                39.0ms × (0.99,1.00)    39.6ms × (0.99,1.00)  +1.54%
BenchmarkGobEncode                37.8ms × (0.98,1.01)    37.6ms × (1.00,1.01)  ~
BenchmarkGzip                      661ms × (0.99,1.01)     663ms × (0.99,1.02)  ~
BenchmarkGunzip                    142ms × (1.00,1.00)     142ms × (1.00,1.00)  ~
BenchmarkHTTPClientServer          132µs × (0.99,1.01)     132µs × (0.99,1.01)  ~
BenchmarkJSONEncode               56.3ms × (0.99,1.01)    56.2ms × (0.99,1.01)  ~
BenchmarkJSONDecode                138ms × (0.99,1.01)     138ms × (1.00,1.00)  ~
BenchmarkMandelbrot200            6.01ms × (1.00,1.00)    6.03ms × (1.00,1.01)  +0.23%
BenchmarkGoParse                  10.2ms × (0.87,1.05)     9.8ms × (0.93,1.10)  ~
BenchmarkRegexpMatchEasy0_32       208ns × (1.00,1.00)     207ns × (1.00,1.00)  ~
BenchmarkRegexpMatchEasy0_1K       588ns × (1.00,1.00)     581ns × (1.00,1.01)  -1.27%
BenchmarkRegexpMatchEasy1_32       182ns × (0.99,1.01)     185ns × (0.99,1.01)  +1.65%
BenchmarkRegexpMatchEasy1_1K       986ns × (1.00,1.01)     975ns × (1.00,1.01)  -1.17%
BenchmarkRegexpMatchMedium_32      323ns × (1.00,1.01)     328ns × (0.99,1.00)  +1.55%
BenchmarkRegexpMatchMedium_1K     89.9µs × (1.00,1.00)    88.6µs × (1.00,1.01)  -1.38%
BenchmarkRegexpMatchHard_32       4.72µs × (0.95,1.01)    4.69µs × (0.95,1.03)  ~
BenchmarkRegexpMatchHard_1K        133µs × (1.00,1.01)     133µs × (1.00,1.01)  ~
BenchmarkRevcomp                   900ms × (1.00,1.05)     902ms × (0.99,1.05)  ~
BenchmarkTemplate                  168ms × (0.99,1.01)     174ms × (0.99,1.01)  +3.30%
BenchmarkTimeParse                 637ns × (1.00,1.00)     639ns × (1.00,1.00)  +0.31%
BenchmarkTimeFormat                738ns × (1.00,1.00)     736ns × (1.00,1.01)  ~

Change-Id: I03ce152852edec404538f6c20eb650fac82e2aa2
Reviewed-on: https://go-review.googlesource.com/9224
Reviewed-by: Austin Clements <austin@google.com>
2015-04-28 01:38:06 +00:00
api api: update next.txt 2015-04-11 07:13:48 +00:00
doc doc/go1.5.txt: go doc 2015-04-27 23:24:27 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc misc/cgo/testcshared: make test.bash resilient against noise. 2015-04-24 18:32:24 +00:00
src cmd/internal/gc: inline writeBarrierEnabled check before calling writebarrierptr 2015-04-28 01:38:06 +00:00
test test: gofmt run.go 2015-04-28 00:08:50 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore ARM64 build products 2015-03-16 18:44:22 +00:00
AUTHORS A+C: add another email address for Emil Hessman 2014-11-12 10:01:23 -08:00
CONTRIBUTING.md doc: direct people to the mailing list 2015-01-18 21:27:07 +00:00
CONTRIBUTORS C: add Nick Cooper (Google CLA). 2014-11-14 17:03:17 +11:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE
PATENTS
README.md doc: fix broken link in README 2015-02-19 05:50:57 +00:00
robots.txt

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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For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.

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.

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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

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Binary Distribution Notes

If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.

For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:

export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin

See https://golang.org/doc/install or doc/install.html for more details.