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Date: Thu, 15 Dec 2016 17:56:58 +0000 (UTC)
From: "Dawid Weiss (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.13028441.1481822163000.531394.1481824618435@Atlassian.JIRA>
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References: <JIRA.13028441.1481822163000@Atlassian.JIRA> <JIRA.13028441.1481822163274@arcas>
Subject: [jira] [Commented] (LUCENE-7594) Float/DoublePoint should not
 recommend using Math.nextUp/nextDown for exclusive ranges
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archived-at: Thu, 15 Dec 2016 17:57:01 -0000


    [ https://issues.apache.org/jira/browse/LUCENE-7594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752029#comment-15752029 ] 

Dawid Weiss commented on LUCENE-7594:
-------------------------------------

I checked and javac doesn't recognize it as a static expression, for example:
{code}
      10: ldc           #31                 // float -0.0f
      12: invokestatic  #27                 // Method java/lang/Float.floatToIntBits:(F)I
{code}
very likely it'd be optimized away later in hotspot, but any of the alternatives I mentioned are just as good.


> Float/DoublePoint should not recommend using Math.nextUp/nextDown for exclusive ranges
> --------------------------------------------------------------------------------------
>
>                 Key: LUCENE-7594
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7594
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7594.patch
>
>
> Float/Double points are supposed to be consistent with Double/Float.compare, so +0 is supposed to compare greater than -0. However Math.nextUp/nextDown is not consistent with Double/Float.compare and returns MIN_VALUE for nextUp(-0).


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