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Keith Randall 5cadc91b3c cmd/compile: intrinsics for math/bits.OnesCount 
Popcount instructions on amd64 are not guaranteed to be
present, so we must guard their call.  Rewrite rules can't
generate control flow at the moment, so the intrinsifier
needs to generate that code.

name           old time/op  new time/op  delta
OnesCount-8    2.47ns ± 5%  1.04ns ± 2%  -57.70%  (p=0.000 n=10+10)
OnesCount16-8  1.05ns ± 1%  0.78ns ± 0%  -25.56%    (p=0.000 n=9+8)
OnesCount32-8  1.63ns ± 5%  1.04ns ± 2%  -35.96%  (p=0.000 n=10+10)
OnesCount64-8  2.45ns ± 0%  1.04ns ± 1%  -57.55%   (p=0.000 n=6+10)

Update #18616

Change-Id: I4aff2cc9aa93787898d7b22055fe272a7cf95673
Reviewed-on: https://go-review.googlesource.com/38320
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2017-04-04 02:40:11 +00:00
.github doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
api math/big: define Word as uint instead of uintptr 2017-02-21 19:31:40 +00:00
doc spec: for non-constant map keys, add reference to evaluation order section 2017-03-24 18:51:10 +00:00
lib/time *.bash: always use the same string equality operator 2017-03-14 21:46:31 +00:00
misc cmd/link: make mach-o dwarf segment properly aligned 2017-03-30 12:29:18 +00:00
src cmd/compile: intrinsics for math/bits.OnesCount 2017-04-04 02:40:11 +00:00
test cmd/link: canonicalize the "package" of dupok text symbols 2017-04-02 03:25:02 +00:00
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.gitignore cmd/dist: move cmd/go z files to cmd/go/internal/cfg 2017-02-03 20:30:52 +00:00
AUTHORS A+C: automated update 2016-12-21 03:22:22 +00:00
CONTRIBUTING.md doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
CONTRIBUTORS A+C: automated update 2016-12-21 03:22:22 +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.

Gopher image 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.