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The Go programming language
107d18299c
According to Wikipedia: http://en.wikipedia.org/wiki/SHA-1 there is an alternate formulation for the FUNC1 transform, namely f1 = d xor (b and (c xor d)) instead of f1 = (b and c) or ((not b) and d) This reduces the instruction count of FUNC1 from 6 to 4 and makes about 5% speed improvement on amd64 and suprisingly 17% on 386. amd64 Intel(R) Core(TM) i7 CPU Q 820 @ 1.73GHz: benchmark old ns/op new ns/op delta BenchmarkHash8Bytes 506 499 -1.38% BenchmarkHash1K 3099 2961 -4.45% BenchmarkHash8K 22292 21243 -4.71% benchmark old MB/s new MB/s speedup BenchmarkHash8Bytes 15.80 16.00 1.01x BenchmarkHash1K 330.40 345.82 1.05x BenchmarkHash8K 367.48 385.63 1.05x i386 Intel(R) Core(TM) i7 CPU Q 820 @ 1.73GHz: benchmark old ns/op new ns/op delta BenchmarkHash8Bytes 647 615 -4.95% BenchmarkHash1K 3673 3161 -13.94% BenchmarkHash8K 26141 22374 -14.41% benchmark old MB/s new MB/s speedup BenchmarkHash8Bytes 12.35 13.01 1.05x BenchmarkHash1K 278.74 323.94 1.16x BenchmarkHash8K 313.37 366.13 1.17x The improvements on an Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz were almost identical. R=golang-dev, r, hanwen CC=golang-dev, rsc https://golang.org/cl/19910043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
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 README). 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.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 doc/install.html for more details.