You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@commons.apache.org by "Charles Cooper (JIRA)" <ji...@apache.org> on 2013/03/25 11:07:16 UTC

[jira] [Created] (MATH-954) Faster implementation of FastMath.abs

Charles Cooper created MATH-954:
-----------------------------------

             Summary: Faster implementation of FastMath.abs
                 Key: MATH-954
                 URL: https://issues.apache.org/jira/browse/MATH-954
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 3.1.1
         Environment: java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.4) (6b27-1.12.4-1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

Linux debian 3.2.0-4-amd64 #1 SMP Debian 3.2.39-2 x86_64 GNU/Linux

Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz

            Reporter: Charles Cooper
            Priority: Minor
             Fix For: 3.1.1


Faster implementations of abs() which use bitwise operations in preference to branching. By my benchmark abs(double/float) are about 10-20% faster, and abs(long/int) more than twice as fast. Patch attached.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira