[jira] Commented: (HARMONY-5014) [drlvm][jit][opt] "instanceof" breaks scalar replecement in the new HashMap implementation

["Dmitry Pronichkin (JIRA)" <ji...@apache.org>]

    [ 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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