e93d5b5e05
Add a fastpath that uses 32bit loads and compares to check 8 ASCII characters per loop iteration. This avoids the overhead of comparing and branching for every byte individually. Combining two 32bit loads into an uint32 allows the same code to be used for 32bit and 64bit platforms. amd64 (Intel i7-3520M): name old time/op new time/op delta ValidTenASCIIChars 15.6ns ± 4% 8.5ns ±14% -45.27% (p=0.000 n=10+10) ValidTenJapaneseChars 50.0ns ± 2% 52.7ns ±15% ~ (p=0.469 n=10+10) ValidStringTenASCIIChars 13.5ns ± 1% 7.9ns ± 5% -41.56% (p=0.000 n=10+10) ValidStringTenJapaneseChars 46.3ns ± 2% 45.8ns ± 2% ~ (p=0.085 n=10+10) arm (Raspberry Pi 3): name old time/op new time/op delta ValidTenASCIIChars 87.5ns ± 0% 58.5ns ± 0% -33.11% (p=0.000 n=9+10) ValidTenJapaneseChars 359ns ± 0% 384ns ± 0% +6.96% (p=0.000 n=10+9) ValidStringTenASCIIChars 87.5ns ± 0% 57.5ns ± 0% -34.31% (p=0.000 n=10+10) ValidStringTenJapaneseChars 356ns ± 0% 377ns ± 0% +5.90% (p=0.000 n=10+10) Change-Id: I9da942bddb250ee1f0ef7aabb4a8cb48edd9053e Reviewed-on: https://go-review.googlesource.com/c/go/+/228823 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
||
|---|---|---|
| .github | ||
| api | ||
| doc | ||
| lib/time | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| AUTHORS | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| favicon.ico | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| robots.txt | ||
| SECURITY.md | ||
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 thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that the Go project uses 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.