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The Go programming language
b8fdaaf028
The change contains 3 spot optimizations to scan loop: 1. Don't use byte vars, use uintptr's instead. This seems to alleviate some codegen issue, and alone accounts to a half of speedup. 2. Remove bitmap cache. Currently we cache only 1 byte, so caching is not particularly effective anyway. Removal of the cache simplifies code and positively affects regalloc. 3. Replace BitsMultiword switch with if and do debug checks only in Debug mode. I've benchmarked changes separately and ensured that each of them provides speedup on top of the previous one. This change as a whole fixes the unintentional regressions of scan loop that were introduced during development cycle. Fixes #8625. Fixes #8565. On go.benchmarks/garbage benchmark: GOMAXPROCS=1 time: -3.13% cputime: -3.22% gc-pause-one: -15.71% gc-pause-total: -15.71% GOMAXPROCS=32 time: -1.96% cputime: -4.43% gc-pause-one: -6.22% gc-pause-total: -6.22% LGTM=khr, rsc R=golang-codereviews, khr CC=golang-codereviews, rlh, rsc https://golang.org/cl/153990043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install-source.html
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After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
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 README). 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.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 doc/install.html for more details.