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From "deven you (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-6460) [classlib][fdlibm]Upgrade fdlibm5.2 to 5.3
Date Wed, 03 Mar 2010 08:33:27 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

deven you updated HARMONY-6460:

    Attachment: TestMathTan.java

Test case for Math.tan() and StrictMath.tan()
the result are below:
on ri6: sun's 1.6.0_14

Math.tan(3.243923053425431E274)         is 5.4039182542783925E14
StrictMath.tan(3.243923053425431E274) is 5.4039182542783925E14
Math.tan(2.0035964250000004E7)            is -3.117343612134583E10
StrictMath.tan(2.0035964250000004E7)    is -3.117343612134583E10

on harmony trunk
Math.tan(3.243923053425431E274)         is 5.403918254278393E14
StrictMath.tan(3.243923053425431E274) is 5.403918254278393E14
Math.tan(2.0035964250000004E7)            is -3.1173436121345825E10
StrictMath.tan(2.0035964250000004E7)    is -3.1173436121345825E10

> [classlib][fdlibm]Upgrade fdlibm5.2 to 5.3
> ------------------------------------------
>                 Key: HARMONY-6460
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6460
>             Project: Harmony
>          Issue Type: Improvement
>          Components: Classlib
>    Affects Versions: 5.0M14
>            Reporter: deven you
>             Fix For: 5.0M14
>         Attachments: TestMathTan.java
>   Original Estimate: 96h
>  Remaining Estimate: 96h
> Hi All,
> I noticed that java spec says "The Java math library is defined with respect to fdlibm
version 5.3." within java.lang.StrictMath class specification from jdk 5.0. However our harmony
still use fdlibm5.2. And a test case[1] shows harmony's math functions results are different
compared to ri 6.0 for this reason.
>  So I think we should upgrade fdlibm from 5.2 to 5.3 to keep consistency with ri. I have
done this on my local machine by following steps:
> 1. Download fdlibm5.3 zip file from http://www.validlab.com/software/
> 2. Unzip the zip file, this will unzip a folder named fdlibm53 on current path. Then
enter fdlibm53 and rename fdlibm.h, Makefile, Makefile.in and s_lib_version.c with suffix
> 3. Re package all files in fdlibm53 into fdlibm_5.3.zip.
> 4. Replace HYROOT/deploy/oss/fdlibm_5.2.zip with the above fdlibm_5.3.zip, HYROOT is
the root directory of harmony classlib trunk repository.
> 5. Apply attached patch[2].
> 6. Build the trunk and run corresponding test case. 
> [1][2]: see the attached files

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