e7e4a4ffa3
The current generator is a simple LSFR, which showed strong correlation in higher bits, as manifested by fastrandn(). Change it with xorshift64+, which is slightly more complex, has a larger state, but has a period of 2^64-1 and is much better at statistical tests. The version used here is capable of passing Diehard and even SmallCrush. Speed is slightly worse but is probably insignificant: name old time/op new time/op delta Fastrand-4 0.77ns ±12% 0.91ns ±21% +17.31% (p=0.048 n=5+5) FastrandHashiter-4 13.6ns ±21% 15.2ns ±17% ~ (p=0.160 n=6+5) Fastrandn/2-4 2.30ns ± 5% 2.45ns ±15% ~ (p=0.222 n=5+5) Fastrandn/3-4 2.36ns ± 7% 2.45ns ± 6% ~ (p=0.222 n=5+5) Fastrandn/4-4 2.33ns ± 8% 2.61ns ±30% ~ (p=0.126 n=6+5) Fastrandn/5-4 2.33ns ± 5% 2.48ns ± 9% ~ (p=0.052 n=6+5) Fixes #21806 Change-Id: I013bb37b463fdfc229a7f324df8fe2da8d286f33 Reviewed-on: https://go-review.googlesource.com/62530 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
||
|---|---|---|
| .github | ||
| api | ||
| doc | ||
| lib/time | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| AUTHORS | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| favicon.ico | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| robots.txt | ||
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
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.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Download and Install
Binary Distributions
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
Install From Source
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Contributing
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 the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.