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Brian Kessler a73abca37b math/big: handle alias of cofactor inputs in GCD 
If the variables passed in to the cofactor arguments of GCD (x, y)
aliased the input arguments (a, b), the previous implementation would
result in incorrect results for y.  This change reorganizes the calculation
so that the only case that need to be handled is when y aliases b, which
can be handled with a simple check.

Tests were added for all of the alias cases for input arguments and and
and irrelevant test case for a previous binary GCD calculation was dropped.

Fixes #30217

Change-Id: Ibe6137f09b3e1ae3c29e3c97aba85b67f33dc169
Reviewed-on: https://go-review.googlesource.com/c/162517
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-02-27 00:11:17 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api text/scanner: don't liberally consume (invalid) floats or underbars 2019-02-20 20:23:28 +00:00
doc doc: add 1.12 to the project history 2019-02-26 17:31:55 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc misc/android: copy testdata directories to device before running 2019-02-26 18:01:15 +00:00
src math/big: handle alias of cofactor inputs in GCD 2019-02-27 00:11:17 +00:00
test cmd/compile: don't generate newobject call for 0-sized types 2019-02-26 23:08:15 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Elias Naur 2019-01-23 15:05:26 +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
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README.md

The Go Programming Language

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