| commit | 49da931268fe4d1fcee988c05b1d65dad8668506 | [log] [tgz] |
|---|---|---|
| author | Martin Möhrmann <martisch@uos.de> | Sun Mar 20 15:24:50 2016 +0100 |
| committer | Rob Pike <r@golang.org> | Wed Mar 23 06:31:12 2016 +0000 |
| tree | 413f024279dfa72245aff2bf05dabcf93ecd96e6 | |
| parent | 7162c4d05c1fed9db517c92b9a5232243ec453a2 [diff] |
fmt: cleanup and optimize doPrintf for simple formats Make a fast path for format strings that do not use precision or width specifications or argument indices. Only check and enforce the restriction to not pad left with zeros in code paths that change either f.minus or f.zero. Consolidate the if chains at the end of the main doPrintf loop into a switch statement. Move error printing into extra functions to reduce size of this switch statement. name old time/op new time/op delta SprintfPadding-2 234ns ± 1% 233ns ± 1% -0.54% (p=0.010 n=19+19) SprintfEmpty-2 37.0ns ± 3% 39.1ns ±14% ~ (p=0.501 n=17+20) SprintfString-2 112ns ± 1% 101ns ± 1% -9.21% (p=0.000 n=19+20) SprintfTruncateString-2 139ns ± 1% 139ns ± 0% +0.57% (p=0.000 n=19+19) SprintfQuoteString-2 402ns ± 0% 392ns ± 0% -2.35% (p=0.000 n=19+20) SprintfInt-2 114ns ± 1% 102ns ± 2% -10.92% (p=0.000 n=20+20) SprintfIntInt-2 177ns ± 2% 155ns ± 2% -12.67% (p=0.000 n=18+18) SprintfPrefixedInt-2 260ns ± 3% 249ns ± 3% -4.55% (p=0.000 n=20+20) SprintfFloat-2 190ns ± 1% 178ns ± 2% -6.54% (p=0.000 n=20+20) SprintfComplex-2 533ns ± 1% 517ns ± 3% -2.95% (p=0.000 n=20+20) SprintfBoolean-2 102ns ± 1% 93ns ± 2% -9.30% (p=0.000 n=20+20) SprintfHexString-2 176ns ± 0% 168ns ± 2% -4.49% (p=0.000 n=16+19) SprintfHexBytes-2 181ns ± 1% 174ns ± 2% -4.27% (p=0.000 n=20+20) SprintfBytes-2 326ns ± 1% 311ns ± 1% -4.51% (p=0.000 n=20+20) ManyArgs-2 540ns ± 2% 497ns ± 1% -8.08% (p=0.000 n=18+16) FprintInt-2 150ns ± 0% 149ns ± 0% -0.33% (p=0.000 n=20+18) FprintfBytes-2 185ns ± 0% 165ns ± 0% -10.98% (p=0.000 n=20+18) FprintIntNoAlloc-2 113ns ± 0% 112ns ± 0% -0.88% (p=0.000 n=20+20) Change-Id: I9ada8faa1f46aa67ea116a94ab3f4ad3e405c8fe Reviewed-on: https://go-review.googlesource.com/20919 Run-TryBot: Rob Pike <r@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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.
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
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
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 file). 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-source.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 https://golang.org/doc/install or doc/install.html for more details.