56e0ecc5ea
Keep track of how many uses each Value has. Each appearance in Value.Args and in Block.Control counts once. The number of uses of a value is generically useful to constrain rewrite rules. For instance, we might want to prevent merging index operations into loads if the same index expression is used lots of times. But I have one use in particular for which the use count is required. We must make sure we don't combine ops with loads if the load has more than one use. Otherwise, we may split a single load into multiple loads and that breaks perceived behavior in the presence of races. In particular, the load of m.state in sync/mutex.go:Lock can't be done twice. (I have a separate CL which triggers the mutex failure. This CL has a test which demonstrates a similar failure.) Change-Id: Icaafa479239f48632a069d0c3f624e6ebc6b1f0e Reviewed-on: https://go-review.googlesource.com/20790 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Todd Neal <todd@tneal.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.