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18d98bc9cb
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Russ Cox 18d98bc9cb cmd/internal/gc: avoid turning 'x = f()' into 'tmp = f(); x = tmp' for simple x 
This slows down more things than I expected, but it also speeds things up,
and it reduces stack frame sizes and the load on the optimizer, so it's still
likely a net win.

name                                    old mean                new mean        delta
BenchmarkBinaryTree17              13.2s × (0.98,1.03)     13.2s × (0.98,1.02)  ~ (p=0.795)
BenchmarkFannkuch11                4.41s × (1.00,1.00)     4.45s × (0.99,1.01)  +0.88% (p=0.000)
BenchmarkFmtFprintfEmpty          86.4ns × (0.99,1.01)    90.1ns × (0.95,1.05)  +4.31% (p=0.000)
BenchmarkFmtFprintfString          318ns × (0.96,1.07)     337ns × (0.98,1.03)  +6.05% (p=0.000)
BenchmarkFmtFprintfInt             332ns × (0.97,1.04)     320ns × (0.97,1.02)  -3.42% (p=0.000)
BenchmarkFmtFprintfIntInt          562ns × (0.96,1.04)     574ns × (0.96,1.06)  +2.00% (p=0.013)
BenchmarkFmtFprintfPrefixedInt     442ns × (0.96,1.06)     450ns × (0.97,1.05)  +1.73% (p=0.039)
BenchmarkFmtFprintfFloat           640ns × (0.99,1.02)     659ns × (0.99,1.03)  +3.01% (p=0.000)
BenchmarkFmtManyArgs              2.19µs × (0.97,1.06)    2.21µs × (0.98,1.02)  ~ (p=0.104)
BenchmarkGobDecode                20.0ms × (0.98,1.03)    19.7ms × (0.97,1.04)  -1.35% (p=0.035)
BenchmarkGobEncode                17.8ms × (0.96,1.04)    18.0ms × (0.96,1.06)  ~ (p=0.131)
BenchmarkGzip                      653ms × (0.99,1.02)     652ms × (0.99,1.01)  ~ (p=0.572)
BenchmarkGunzip                    143ms × (0.99,1.02)     142ms × (1.00,1.01)  -0.52% (p=0.005)
BenchmarkHTTPClientServer          110µs × (0.98,1.03)     108µs × (0.99,1.02)  -1.90% (p=0.000)
BenchmarkJSONEncode               40.0ms × (0.98,1.05)    41.5ms × (0.97,1.06)  +3.89% (p=0.000)
BenchmarkJSONDecode                118ms × (0.99,1.01)     118ms × (0.98,1.01)  +0.69% (p=0.010)
BenchmarkMandelbrot200            6.03ms × (1.00,1.01)    6.03ms × (1.00,1.01)  ~ (p=0.924)
BenchmarkGoParse                  8.43ms × (0.92,1.11)    8.56ms × (0.93,1.05)  ~ (p=0.242)
BenchmarkRegexpMatchEasy0_32       180ns × (0.91,1.07)     163ns × (1.00,1.00)  -9.33% (p=0.000)
BenchmarkRegexpMatchEasy0_1K       550ns × (0.98,1.02)     558ns × (0.99,1.01)  +1.44% (p=0.000)
BenchmarkRegexpMatchEasy1_32       152ns × (0.94,1.05)     139ns × (0.98,1.02)  -8.51% (p=0.000)
BenchmarkRegexpMatchEasy1_1K       909ns × (0.98,1.06)     868ns × (0.99,1.02)  -4.52% (p=0.000)
BenchmarkRegexpMatchMedium_32      262ns × (0.97,1.03)     253ns × (0.99,1.02)  -3.31% (p=0.000)
BenchmarkRegexpMatchMedium_1K     73.8µs × (0.98,1.04)    72.7µs × (1.00,1.01)  -1.61% (p=0.001)
BenchmarkRegexpMatchHard_32       3.87µs × (0.99,1.02)    3.87µs × (1.00,1.01)  ~ (p=0.791)
BenchmarkRegexpMatchHard_1K        118µs × (0.98,1.04)     117µs × (0.99,1.02)  ~ (p=0.110)
BenchmarkRevcomp                   1.00s × (0.94,1.10)     0.99s × (0.94,1.09)  ~ (p=0.433)
BenchmarkTemplate                  140ms × (0.97,1.04)     140ms × (0.99,1.01)  ~ (p=0.303)
BenchmarkTimeParse                 622ns × (0.99,1.02)     625ns × (0.99,1.01)  +0.51% (p=0.001)
BenchmarkTimeFormat                731ns × (0.98,1.04)     719ns × (0.99,1.01)  -1.66% (p=0.000)

Change-Id: Ibc3edb59a178adafda50156f46a341f69a17d83f
Reviewed-on: https://go-review.googlesource.com/9721
Reviewed-by: David Chase <drchase@google.com>
2015-05-12 16:26:47 +00:00
api runtime: remove unused GC times from api.next 2015-05-06 14:49:26 +00:00
doc doc/effective_go: make function signature match function body 2015-05-08 17:01:24 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc cmd/internal/ld, runtime: abort on shared library ABI mismatch 2015-05-12 01:30:40 +00:00
src cmd/internal/gc: avoid turning 'x = f()' into 'tmp = f(); x = tmp' for simple x 2015-05-12 16:26:47 +00:00
test cmd/internal/gc: detect bad append(f()) during type check 2015-05-12 16:26:35 +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 CONTRIBUTORS: add Burcu Dogan's personal mail 2015-05-06 16:06:42 +00:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS
README.md doc: fix broken link in README 2015-02-19 05:50:57 +00:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

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.

Please report issues here: https://golang.org/issue/new

Go is the work of hundreds of contributors. We appreciate your help!

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

Please note that we do not use pull requests.

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

--

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.