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Posted to commits@harmony.apache.org by "Tim Ellison (JIRA)" <ji...@apache.org> on 2006/10/02 17:54:20 UTC
[jira] Commented: (HARMONY-1636) [classlib][java.math] optimization
of two-complement related methods
[ http://issues.apache.org/jira/browse/HARMONY-1636?page=comments#action_12439199 ]
Tim Ellison commented on HARMONY-1636:
--------------------------------------
Daniel, can you do an update and refresh the patch? there are a number of collisions on this version. Thanks.
> [classlib][java.math] optimization of two-complement related methods
> --------------------------------------------------------------------
>
> Key: HARMONY-1636
> URL: http://issues.apache.org/jira/browse/HARMONY-1636
> Project: Harmony
> Issue Type: Improvement
> Components: Classlib
> Reporter: Daniel Fridlender
> Priority: Minor
> Attachments: HARMONY-1636_lowLevelMethodsOpt.diff.zip, HARMONY-1636_lowLevelMethodsOpt.diff.zip
>
>
> Since the current implementation of BigInteger is sign-magnitude, the implementation of two-complement related methods (e.g. bitwise logical operators, bitLength) often create intermediate data (two-complement copies of arguments and results). This is costly in space and time.
> The present optimization avoids creating that intermediate data.
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