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From "Dmitry Pronichkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5014) [drlvm][jit][opt] "instanceof" breaks scalar replecement in the new HashMap implementation
Date Wed, 24 Oct 2007 12:39:50 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537306

Dmitry Pronichkin commented on HARMONY-5014:

The mentioned hashmap patch was discussed in dev list: http://www.mail-archive.com/dev@harmony.apache.org/msg09709.html

> [drlvm][jit][opt] "instanceof" breaks scalar replecement in the new HashMap implementation
> ------------------------------------------------------------------------------------------
>                 Key: HARMONY-5014
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5014
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Dmitry Pronichkin
> The new HashMap implementation made by Tim Ellison came into collision with the following
problem: scalar replacement for HashMap.get(Integer.valueOf(..)) is not working. The reason
is that the Integer object is not scalarized because of "instanceof" instruction. But escape
analysis knows the real type of the key and it can evaluate "instanceof" making possible for
the key to be scalarized.

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