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From "Daniel Fridlender (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-1636) [classlib][java.math] optimization of two-complement related methods
Date Tue, 03 Oct 2006 19:12:23 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-1636?page=comments#action_12439628 ] 
Daniel Fridlender commented on HARMONY-1636:

Tim, the collisions are due to a commit made 3 days after our donation.  The patch was applicable
when we submitted it.

I am uploading now a refreshed patch.

> [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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