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Martin Möhrmann b71ed4edc6 strconv: fix performance regression in integer formatting on 32bit platforms 
Some of the changes in CL golang.org/cl/38071/ assumed that / and %
could always be combined to use only one DIV instruction. However,
this is not the case for 64bit operands on a 32bit platform which use
seperate runtime functions to calculate division and modulo.

This CL restores the original optimizations that help on 32bit platforms
with negligible impact on 64bit platforms.

386:
name          old time/op  new time/op  delta
FormatInt-2   6.06µs ± 0%  6.02µs ± 0%  -0.70%  (p=0.000 n=20+20)
AppendInt-2   4.98µs ± 0%  4.98µs ± 0%    ~     (p=0.747 n=18+18)
FormatUint-2  1.93µs ± 0%  1.85µs ± 0%  -4.19%  (p=0.000 n=20+20)
AppendUint-2  1.71µs ± 0%  1.64µs ± 0%  -3.68%  (p=0.000 n=20+20)

amd64:
name          old time/op  new time/op  delta
FormatInt-2   2.41µs ± 0%  2.41µs ± 0%  -0.09%  (p=0.010 n=18+18)
AppendInt-2   1.77µs ± 0%  1.77µs ± 0%  +0.08%  (p=0.000 n=18+18)
FormatUint-2   653ns ± 1%   653ns ± 0%    ~     (p=0.178 n=20+20)
AppendUint-2   514ns ± 0%   513ns ± 0%  -0.13%  (p=0.000 n=20+17)

Change-Id: I574a18e54fb41b25fbe51ce696e7a8765abc79a6
Reviewed-on: https://go-review.googlesource.com/38051
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
 		2017-03-12 21:37:32 +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 doc: add link to the setting GOPATH guide 2017-03-07 00:59:54 +00:00
lib/time lib/time: update tzdata to 2016j 2017-01-05 01:00:53 +00:00
misc cmd/compile: print columns (not just lines) in error messages 2017-03-09 23:29:49 +00:00
src strconv: fix performance regression in integer formatting on 32bit platforms 2017-03-12 21:37:32 +00:00
test cmd/compile: print columns (not just lines) in error messages 2017-03-09 23:29:49 +00:00
.gitattributes
…
.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
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
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README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
robots.txt
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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.

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Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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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.