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The Go programming language
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Josh Bleecher Snyder 1848d71445 cmd/gc: don't give credit for NOPs during register allocation 
The register allocator decides which variables should be placed into registers by charging for each load/store and crediting for each use, and then selecting an allocation with minimal cost. NOPs will be eliminated, however, so using a variable in a NOP should not generate credit.

Issue 7867 arises from attempted registerization of multi-word variables because they are used in NOPs. By not crediting for that use, they will no longer be considered for registerization.

This fix could theoretically lead to better register allocation, but NOPs are rare relative to other instructions.

Fixes #7867.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/94810044
 		2014-05-09 09:55:17 -07:00
api api: update next.txt 2014-04-01 13:14:45 -04:00
doc testing: write profiles on failure 2014-05-09 12:18:50 -04:00
include include/plan9: make mklibc.rc compatible with 9atom 2014-04-19 09:55:09 +02:00
lib lib/time: update time zone info to v.2014b 2014-04-29 21:41:54 -04:00
misc misc/vim/readme.txt: workaround weird OS X vim bug. 2014-04-28 14:24:14 -04:00
src cmd/gc: don't give credit for NOPs during register allocation 2014-05-09 09:55:17 -07:00
test cmd/gc: don't give credit for NOPs during register allocation 2014-05-09 09:55:17 -07:00
.hgignore lib9: enable on Plan 9 2014-02-13 20:06:41 +01:00
.hgtags tag go1.2.2 2014-05-05 10:45:56 -07:00
AUTHORS A+C: David Calavera (individual CLA) 2014-05-02 10:54:50 -07:00
CONTRIBUTORS C: Patrick Riley (Google CLA) 2014-05-06 22:08:46 -04:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README README: Fix installation instructions 2013-11-20 13:47:37 -08:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
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-source.html
in your web browser.

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.