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smasher164 5ca44dc403 math/bits: make Add and Sub fallbacks constant time 
Make the extended precision add-with-carry and sub-with-carry operations
take a constant amount of time to execute, regardless of input.

name             old time/op  new time/op  delta
Add-4            1.16ns ±11%  1.51ns ± 5%  +30.52%  (p=0.008 n=5+5)
Add32-4          1.08ns ± 0%  1.03ns ± 1%   -4.86%  (p=0.029 n=4+4)
Add64-4          1.09ns ± 1%  1.95ns ± 3%  +79.23%  (p=0.008 n=5+5)
Add64multiple-4  4.03ns ± 1%  4.55ns ±11%  +13.07%  (p=0.008 n=5+5)
Sub-4            1.08ns ± 1%  1.50ns ± 0%  +38.17%  (p=0.016 n=5+4)
Sub32-4          1.09ns ± 2%  1.53ns ±10%  +40.26%  (p=0.008 n=5+5)
Sub64-4          1.10ns ± 1%  1.47ns ± 1%  +33.39%  (p=0.008 n=5+5)
Sub64multiple-4  4.30ns ± 2%  4.08ns ± 4%   -5.07%  (p=0.032 n=5+5)

Fixes #31267

Change-Id: I1824b1b3ab8f09902ce8b5fef84ce2fdb8847ed9
Reviewed-on: https://go-review.googlesource.com/c/go/+/170758
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 		2019-05-20 01:13:27 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api: update next.txt 2019-05-08 16:55:59 +00:00
doc spec: clarify that slice a expression shares underlying array with operand 2019-05-14 22:30:48 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc misc/android: fix a typo in README 2019-05-17 06:01:17 +00:00
src math/bits: make Add and Sub fallbacks constant time 2019-05-20 01:13:27 +00:00
test cmd/compile: fix the error of absorbing boolean tests into block(FGE, FGT) 2019-05-16 13:46:25 +00:00
.gitattributes
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A: Add Maya Rashish (individual CLA) 2019-04-23 14:40:30 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.12 2019-01-30 18:01:19 +00:00
LICENSE
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PATENTS
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README.md README: linkify some paths 2018-06-06 18:07:01 +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.

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

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses 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.