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The Go programming language
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16381b145e
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Robert Griesemer 16381b145e go/token: faster FileSet.Position implementation 
- added a cache for last file looked up: avoids binary
  search if the file matches

- don't look up extra line info if not present
  (it is almost never present)

- inline one critical binary search call (inlining
  provides almost 30% improvement in this case)

Together, these changes make the go/printer benchmark
more than twice as fast (53% improvement). gofmt also
sped up by about the same amount.

Also: removed an unused internal field from FileSet.

Measurements (always best of 5 runs):

* original:
  printer.BenchmarkPrint     5    238354200 ns/op (100%)

* using last file cache:
  printer.BenchmarkPrint    10    201796600 ns/op (85%)

* avoiding lookup of extra line info:
  printer.BenchmarkPrint    10    157072700 ns/op (66%)

* inlining a critical binary search call:
  printer.BenchmarkPrint    10    111523500 ns/op (47%)

gofmt (always best of 3 runs):

* before:
  time gofmt -l src misc
  real	0m33.316s
  user	0m31.298s
  sys	0m0.319s

* after:
  time gofmt -l src misc
  real	0m15.889s
  user	0m14.596s
  sys	0m0.224s

R=r, dfc, bradfitz, rsc1
CC=golang-dev
https://golang.org/cl/4433086
2011-05-02 09:17:46 -07:00
doc go spec: restricted expressions may still be parenthesized 2011-05-02 09:16:31 -07:00
include windows: replace remaining __MINGW32__ instances with _WIN32 2011-02-08 15:42:52 -05:00
lib codereview: various fixes 2011-04-25 12:12:53 -04:00
misc builder: build multiple targets in parallel 2011-04-27 10:12:10 +10:00
src go/token: faster FileSet.Position implementation 2011-05-02 09:17:46 -07:00
test gc: preserve original expression for errors 2011-04-28 13:14:35 -04:00
.hgignore syscall: add Mmap, Munmap on Linux, FreeBSD, OS X 2011-04-06 17:52:02 -04:00
.hgtags tag weekly.2011-04-27 2011-04-28 16:38:01 +10:00
AUTHORS A+C: Vincent Vanackere (individual CLA) 2011-04-21 10:09:53 -04:00
CONTRIBUTORS CONTRIBUTORS: add Dmitriy Vyukov (Google CLA) 2011-04-21 12:09:19 -04:00
favicon.ico add a favicon plus a couple of hi-res versions of gordon 2009-10-26 10:13:07 -07:00
LICENSE LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README build: update, streamline documentation for new $GOBIN 2010-08-24 20:00:50 -04:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

README 

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.html in your web browser.

After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.

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.