Qualtagh created MATH-1271:
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Summary: Unsigned operations
Key: MATH-1271
URL: https://issues.apache.org/jira/browse/MATH-1271
Project: Commons Math
Issue Type: New Feature
Affects Versions: 4.0
Reporter: Qualtagh
Priority: Trivial
Add unsigned operations to ArithmeticUtils: divideUnsigned and
remainderUnsigned. They exist in java.lang.Integer and java.lang.Long since
Java 8. The inner implementation is based on leveraging to long (for ints) and
to BigInteger (for longs). Comments in code suggest using tricks described in
"Hacker's Delight" to stay with smaller type (int and long respectively). Those
tricks were implemented in this pull request:
https://github.com/apache/commons-math/pull/13
I don't know if using an algorithm from "Hacker's Delight" is compatible with
Apache license. The code is faster than standard Java 8 implementation: 2 times
for int and 8 times for long (verified with simple small tests).
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