Hello,

The gcd(int,int) method of ArithmeticUtils seems 2 times slower than the
naive approach using modulo operator.
Gilles tested the patch separately and found similar performance penalty.
Please check it out: 
https://issues.apache.org/jira/browse/MATH-841?page=com.atlassian.jira.plugi
n.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428944#comment-1
3428944

Anyone aware of an environment were the modulo operator is painfully slow ?

Gilles pointed out that my patch don't conform to CM formating style, I
will correct that as well as the javadoc (its mention of the binary gcd
algorithm) if the code change is basically approved here. Please let me
know.
 
Sebastien

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