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Ilya Tocar 37cfb2e07e math: optimize ceil/floor functions on amd64 
Use SSE 4.1 rounding instruction to perform rounding
Results (haswell):

name      old time/op  new time/op  delta
Floor-48  2.71ns ± 0%  1.87ns ± 1%  -31.17%  (p=0.000 n=16+19)
Ceil-48   3.09ns ± 3%  2.16ns ± 0%  -30.16%  (p=0.000 n=19+12)

Change-Id: If63715879eed6530b1eb4fc96132d827f8f43909
Reviewed-on: https://go-review.googlesource.com/14561
Reviewed-by: Klaus Post <klauspost@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2015-10-03 15:55:08 +00:00
api api: update go1.5.txt 2015-07-30 21:14:09 +00:00
doc doc: update release tag in source directions to go1.5.1 2015-10-03 07:58:43 +00:00
lib/time lib/time: update to IANA release 2015e. 2015-07-22 02:56:31 +00:00
misc misc/cgo/testsanitizers: skip test for version of clang before 3.6 2015-10-02 14:17:33 +00:00
src math: optimize ceil/floor functions on amd64 2015-10-03 15:55:08 +00:00
test cmd/compile: Fix internal compiler: getinarg: not a func when returning invalid interface. 2015-10-03 15:32:46 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore y.output 2015-06-10 00:28:52 +00:00
AUTHORS A+C: automated updates 2015-09-10 00:59:04 +00:00
CONTRIBUTING.md doc: suggest security@golang.org for reporting security issues 2015-06-26 09:53:36 +00:00
CONTRIBUTORS A+C: automated updates 2015-09-10 00:59:04 +00:00
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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.

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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.