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330cffb869
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vpachkov 330cffb869 runtime: remove dead code and unnecessary checks for amd64 
Use amd64 assembly header to remove unnecessary cpu flags checks
and dead code that is guaranteed to not be executed when compiling
for specific microarchitectures.

name                  old time/op  new time/op  delta
BytesCompare/1-12     3.88ns ± 1%  3.18ns ± 1%  -18.15%  (p=0.008 n=5+5)
BytesCompare/2-12     3.89ns ± 1%  3.21ns ± 2%  -17.66%  (p=0.008 n=5+5)
BytesCompare/4-12     3.89ns ± 0%  3.17ns ± 0%  -18.62%  (p=0.008 n=5+5)
BytesCompare/8-12     3.44ns ± 2%  3.39ns ± 1%   -1.36%  (p=0.008 n=5+5)
BytesCompare/16-12    3.40ns ± 1%  3.14ns ± 0%   -7.77%  (p=0.008 n=5+5)
BytesCompare/32-12    3.90ns ± 1%  3.65ns ± 0%   -6.19%  (p=0.008 n=5+5)
BytesCompare/64-12    4.96ns ± 1%  4.71ns ± 2%   -4.98%  (p=0.008 n=5+5)
BytesCompare/128-12   6.42ns ± 0%  5.99ns ± 4%   -6.75%  (p=0.008 n=5+5)
BytesCompare/256-12   9.36ns ± 0%  7.40ns ± 0%  -20.97%  (p=0.008 n=5+5)
BytesCompare/512-12   15.9ns ± 1%  11.4ns ± 1%  -28.36%  (p=0.008 n=5+5)
BytesCompare/1024-12  27.0ns ± 0%  19.3ns ± 0%  -28.36%  (p=0.008 n=5+5)
BytesCompare/2048-12  50.2ns ± 0%  43.3ns ± 0%  -13.71%  (p=0.008 n=5+5)
[Geo mean]            7.13ns       6.07ns       -14.86%

name                old speed      new speed      delta
Count/10-12          723MB/s ± 0%   704MB/s ± 1%  -2.73%  (p=0.008 n=5+5)
Count/32-12         2.21GB/s ± 0%  2.12GB/s ± 2%  -4.21%  (p=0.008 n=5+5)
Count/4K-12         1.03GB/s ± 0%  1.03GB/s ± 1%    ~     (p=1.000 n=5+5)
Count/4M-12         1.04GB/s ± 0%  1.02GB/s ± 2%    ~     (p=0.310 n=5+5)
Count/64M-12        1.02GB/s ± 0%  1.01GB/s ± 1%  -1.00%  (p=0.016 n=5+5)
CountEasy/10-12      779MB/s ± 0%   768MB/s ± 1%  -1.48%  (p=0.008 n=5+5)
CountEasy/32-12     2.15GB/s ± 0%  2.09GB/s ± 1%  -2.71%  (p=0.008 n=5+5)
CountEasy/4K-12     45.1GB/s ± 1%  45.2GB/s ± 1%    ~     (p=0.421 n=5+5)
CountEasy/4M-12     36.4GB/s ± 1%  36.5GB/s ± 1%    ~     (p=0.690 n=5+5)
CountEasy/64M-12    16.1GB/s ± 2%  16.4GB/s ± 1%    ~     (p=0.056 n=5+5)
CountSingle/10-12   2.15GB/s ± 2%  2.22GB/s ± 1%  +3.37%  (p=0.008 n=5+5)
CountSingle/32-12   5.86GB/s ± 1%  5.76GB/s ± 1%  -1.55%  (p=0.008 n=5+5)
CountSingle/4K-12   54.6GB/s ± 1%  55.0GB/s ± 1%    ~     (p=0.548 n=5+5)
CountSingle/4M-12   45.9GB/s ± 4%  46.4GB/s ± 2%    ~     (p=0.548 n=5+5)
CountSingle/64M-12  17.3GB/s ± 1%  17.2GB/s ± 2%    ~     (p=1.000 n=5+5)
[Geo mean]          5.11GB/s       5.08GB/s       -0.53%

name          old speed      new speed      delta
Equal/1-12     200MB/s ± 0%   188MB/s ± 1%   -6.11%  (p=0.008 n=5+5)
Equal/6-12    1.20GB/s ± 0%  1.13GB/s ± 1%   -6.38%  (p=0.008 n=5+5)
Equal/9-12    1.67GB/s ± 3%  1.74GB/s ± 1%   +3.83%  (p=0.008 n=5+5)
Equal/15-12   2.82GB/s ± 1%  2.89GB/s ± 1%   +2.63%  (p=0.008 n=5+5)
Equal/16-12   2.96GB/s ± 1%  3.08GB/s ± 1%   +3.95%  (p=0.008 n=5+5)
Equal/20-12   3.33GB/s ± 1%  3.54GB/s ± 1%   +6.36%  (p=0.008 n=5+5)
Equal/32-12   4.57GB/s ± 0%  5.26GB/s ± 1%  +15.09%  (p=0.008 n=5+5)
Equal/4K-12   62.0GB/s ± 1%  65.9GB/s ± 2%   +6.29%  (p=0.008 n=5+5)
Equal/4M-12   23.6GB/s ± 2%  24.8GB/s ± 4%   +5.43%  (p=0.008 n=5+5)
Equal/64M-12  11.1GB/s ± 2%  11.3GB/s ± 1%   +1.69%  (p=0.008 n=5+5)
[Geo mean]    3.91GB/s       4.03GB/s        +3.11%

name                              old speed      new speed      delta
IndexByte/10-12                   2.64GB/s ± 0%  2.69GB/s ± 0%   +1.67%  (p=0.008 n=5+5)
IndexByte/32-12                   6.79GB/s ± 0%  6.27GB/s ± 0%   -7.57%  (p=0.008 n=5+5)
IndexByte/4K-12                   56.2GB/s ± 0%  56.9GB/s ± 0%   +1.27%  (p=0.008 n=5+5)
IndexByte/4M-12                   40.1GB/s ± 1%  41.7GB/s ± 1%   +4.05%  (p=0.008 n=5+5)
IndexByte/64M-12                  17.5GB/s ± 0%  17.7GB/s ± 1%     ~     (p=0.095 n=5+5)
IndexBytePortable/10-12           2.06GB/s ± 1%  2.16GB/s ± 1%   +5.08%  (p=0.008 n=5+5)
IndexBytePortable/32-12           1.40GB/s ± 1%  1.54GB/s ± 1%  +10.05%  (p=0.008 n=5+5)
IndexBytePortable/4K-12           3.99GB/s ± 0%  4.08GB/s ± 0%   +2.16%  (p=0.008 n=5+5)
IndexBytePortable/4M-12           4.05GB/s ± 1%  4.08GB/s ± 2%     ~     (p=0.095 n=5+5)
IndexBytePortable/64M-12          3.80GB/s ± 1%  3.81GB/s ± 0%     ~     (p=0.421 n=5+5)
IndexRune/10-12                    746MB/s ± 1%   752MB/s ± 0%   +0.85%  (p=0.008 n=5+5)
IndexRune/32-12                   2.33GB/s ± 0%  2.42GB/s ± 0%   +3.66%  (p=0.008 n=5+5)
IndexRune/4K-12                   44.4GB/s ± 0%  44.2GB/s ± 0%     ~     (p=0.095 n=5+5)
IndexRune/4M-12                   36.2GB/s ± 1%  36.3GB/s ± 2%     ~     (p=0.841 n=5+5)
IndexRune/64M-12                  16.2GB/s ± 2%  16.3GB/s ± 2%     ~     (p=0.548 n=5+5)
IndexRuneASCII/10-12              2.57GB/s ± 0%  2.58GB/s ± 0%   +0.63%  (p=0.008 n=5+5)
IndexRuneASCII/32-12              6.00GB/s ± 0%  6.30GB/s ± 1%   +4.98%  (p=0.008 n=5+5)
IndexRuneASCII/4K-12              56.7GB/s ± 0%  56.8GB/s ± 1%     ~     (p=0.151 n=5+5)
IndexRuneASCII/4M-12              41.6GB/s ± 1%  41.7GB/s ± 2%     ~     (p=0.151 n=5+5)
IndexRuneASCII/64M-12             17.7GB/s ± 1%  17.6GB/s ± 1%     ~     (p=0.222 n=5+5)
Index/10-12                       1.06GB/s ± 1%  1.06GB/s ± 0%     ~     (p=0.310 n=5+5)
Index/32-12                       3.57GB/s ± 0%  3.56GB/s ± 1%     ~     (p=0.056 n=5+5)
Index/4K-12                       1.02GB/s ± 2%  1.03GB/s ± 0%     ~     (p=0.690 n=5+5)
Index/4M-12                       1.04GB/s ± 0%  1.03GB/s ± 1%     ~     (p=1.000 n=4+5)
Index/64M-12                      1.02GB/s ± 0%  1.02GB/s ± 0%     ~     (p=0.905 n=5+4)
IndexEasy/10-12                   1.12GB/s ± 2%  1.15GB/s ± 1%   +3.10%  (p=0.008 n=5+5)
IndexEasy/32-12                   3.14GB/s ± 2%  3.13GB/s ± 1%     ~     (p=0.310 n=5+5)
IndexEasy/4K-12                   47.6GB/s ± 1%  47.7GB/s ± 2%     ~     (p=0.310 n=5+5)
IndexEasy/4M-12                   36.4GB/s ± 1%  36.3GB/s ± 2%     ~     (p=0.690 n=5+5)
IndexEasy/64M-12                  16.1GB/s ± 1%  16.4GB/s ± 5%     ~     (p=0.151 n=5+5)
[Geo mean]                        6.39GB/s       6.46GB/s        +1.11%

Change-Id: Ic1ca62f5cc719d87e2c4aeff25ad73507facff82
Reviewed-on: https://go-review.googlesource.com/c/go/+/397576
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2022-08-18 17:17:01 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api crypto/subtle: add XORBytes 2022-08-17 18:47:33 +00:00
doc doc: move Go 1.19 release notes to x/website 2022-08-01 18:07:12 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc misc/cgo/testsanitizers: fix code to detect gcc version correctly 2022-08-11 17:23:33 +00:00
src runtime: remove dead code and unnecessary checks for amd64 2022-08-18 17:17:01 +00:00
test cmd/compile/internal/noder: shape-based stenciling for unified IR 2022-08-18 13:16:21 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
LICENSE
PATENTS
README.md README.md: update wiki link 2022-04-26 16:21:18 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.