78a267e379
Anonymous pointer and slice types are very common and identical anyway, so just reuse them rather than allocating new ones everywhere they appear. Turns out to be a small code/stack size win because SSA relies on gc.Type identity for reusing temporary stack slots: text data bss dec hex filename 6453005 231643 146328 6830976 683b80 go.old 6446660 231643 146328 6824631 6822b7 go.new Saves on memory usage during compile time too, and maybe a small CPU time win, but the benchmarks are pretty noisy: name old time/op new time/op delta Template 342ms ± 8% 339ms ± 9% ~ (p=0.332 n=99+99) Unicode 183ms ± 9% 181ms ±11% ~ (p=0.274 n=95+98) GoTypes 1.05s ± 4% 1.04s ± 3% -1.22% (p=0.000 n=97+95) Compiler 4.49s ± 7% 4.46s ± 6% ~ (p=0.058 n=96+91) name old user-ns/op new user-ns/op delta Template 520M ±17% 522M ±20% ~ (p=0.544 n=98+100) Unicode 331M ±27% 327M ±30% ~ (p=0.615 n=98+98) GoTypes 1.54G ±10% 1.53G ±12% ~ (p=0.173 n=99+100) Compiler 6.33G ±10% 6.33G ±10% ~ (p=0.682 n=98+98) name old alloc/op new alloc/op delta Template 44.5MB ± 0% 44.1MB ± 0% -0.80% (p=0.000 n=97+99) Unicode 37.5MB ± 0% 37.3MB ± 0% -0.44% (p=0.000 n=98+100) GoTypes 126MB ± 0% 124MB ± 0% -1.41% (p=0.000 n=98+99) Compiler 518MB ± 0% 508MB ± 0% -1.90% (p=0.000 n=98+100) name old allocs/op new allocs/op delta Template 441k ± 0% 434k ± 0% -1.76% (p=0.000 n=100+97) Unicode 368k ± 0% 365k ± 0% -0.69% (p=0.000 n=99+99) GoTypes 1.26M ± 0% 1.23M ± 0% -2.27% (p=0.000 n=100+99) Compiler 4.60M ± 0% 4.46M ± 0% -2.96% (p=0.000 n=100+99) Change-Id: I94abce5c57aed0f9c48f567b3ac24c627d4c7c91 Reviewed-on: https://go-review.googlesource.com/30632 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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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.
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.
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
Note that we do not accept pull requests and that we use the issue tracker for bug reports and proposals only. Please ask questions on https://forum.golangbridge.org or https://groups.google.com/forum/#!forum/golang-nuts.
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.