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2a73559023
Go to file
Russ Cox 2a73559023 cmd/internal/gc: emit typedmemmove write barrier from sgen 
Emitting it here instead of rewriting the tree earlier sets us up
to generate an inline check, like we do for single pointers.
But even without the inline check, generating at this level lets
us generate significantly more efficient code, probably due to
having fewer temporaries and less complex high-level code
for the compiler to churn through.

Revcomp is worse, almost certainly due to register pressure.

name                                       old                     new          delta
BenchmarkBinaryTree17              18.0s × (0.99,1.01)     18.0s × (0.99,1.01)  ~
BenchmarkFannkuch11                4.43s × (1.00,1.00)     4.36s × (1.00,1.00)  -1.44%
BenchmarkFmtFprintfEmpty           114ns × (0.95,1.05)      86ns × (0.97,1.06)  -24.12%
BenchmarkFmtFprintfString          468ns × (0.99,1.01)     420ns × (0.99,1.02)  -10.16%
BenchmarkFmtFprintfInt             433ns × (1.00,1.01)     386ns × (0.99,1.02)  -10.74%
BenchmarkFmtFprintfIntInt          748ns × (0.99,1.01)     647ns × (0.99,1.01)  -13.56%
BenchmarkFmtFprintfPrefixedInt     547ns × (0.99,1.01)     499ns × (0.99,1.02)  -8.78%
BenchmarkFmtFprintfFloat           756ns × (1.00,1.01)     689ns × (1.00,1.00)  -8.86%
BenchmarkFmtManyArgs              2.79µs × (1.00,1.01)    2.53µs × (1.00,1.00)  -9.30%
BenchmarkGobDecode                39.6ms × (0.99,1.00)    39.2ms × (0.98,1.01)  -1.07%
BenchmarkGobEncode                37.6ms × (1.00,1.01)    37.5ms × (0.99,1.01)  ~
BenchmarkGzip                      663ms × (0.99,1.02)     660ms × (0.98,1.01)  ~
BenchmarkGunzip                    142ms × (1.00,1.00)     143ms × (1.00,1.00)  ~
BenchmarkHTTPClientServer          132µs × (0.99,1.01)     133µs × (0.99,1.02)  ~
BenchmarkJSONEncode               56.2ms × (0.99,1.01)    54.0ms × (0.98,1.01)  -3.97%
BenchmarkJSONDecode                138ms × (1.00,1.00)     134ms × (0.99,1.02)  -2.70%
BenchmarkMandelbrot200            6.03ms × (1.00,1.01)    6.00ms × (1.00,1.01)  ~
BenchmarkGoParse                  9.82ms × (0.93,1.10)   10.35ms × (0.88,1.11)  ~
BenchmarkRegexpMatchEasy0_32       207ns × (1.00,1.00)     163ns × (0.99,1.01)  -21.26%
BenchmarkRegexpMatchEasy0_1K       581ns × (1.00,1.01)     566ns × (0.99,1.00)  -2.50%
BenchmarkRegexpMatchEasy1_32       185ns × (0.99,1.01)     138ns × (1.00,1.01)  -25.41%
BenchmarkRegexpMatchEasy1_1K       975ns × (1.00,1.01)     892ns × (1.00,1.00)  -8.51%
BenchmarkRegexpMatchMedium_32      328ns × (0.99,1.00)     252ns × (1.00,1.00)  -23.17%
BenchmarkRegexpMatchMedium_1K     88.6µs × (1.00,1.01)    73.0µs × (1.00,1.01)  -17.66%
BenchmarkRegexpMatchHard_32       4.69µs × (0.95,1.03)    3.85µs × (1.00,1.01)  -17.91%
BenchmarkRegexpMatchHard_1K        133µs × (1.00,1.01)     117µs × (1.00,1.00)  -12.34%
BenchmarkRevcomp                   902ms × (0.99,1.05)    1001ms × (0.94,1.01)  +11.04%
BenchmarkTemplate                  174ms × (0.99,1.01)     160ms × (0.99,1.01)  -7.70%
BenchmarkTimeParse                 639ns × (1.00,1.00)     622ns × (1.00,1.00)  -2.66%
BenchmarkTimeFormat                736ns × (1.00,1.01)     736ns × (1.00,1.02)  ~

Change-Id: Ib3bbeb379f5f4819e6f5dcf69bc88a2b7ed41460
Reviewed-on: https://go-review.googlesource.com/9225
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
2015-04-28 01:38:18 +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: emit typedmemmove write barrier from sgen 2015-04-28 01:38:18 +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.

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.