[jira] Created: (RVM-854) Failed to find a value to spill when

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[jira] Created: (RVM-854) Failed to find a value to spill when

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Failed to find a value to spill when
-------------------------------------

                 Key: RVM-854
                 URL: http://jira.codehaus.org/browse/RVM-854
             Project: RVM
          Issue Type: Bug
          Components: Compiler: Optimizing
            Reporter: Daniel Frampton
            Assignee: Daniel Frampton
            Priority: Minor
             Fix For: 3.1.1


The spill cost was being set to max int instead of max double, causing very expensive spills to be overlooked.

The spill costs seem very high (~6E11), is this reasonable?

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[jira] Resolved: (RVM-854) Failed to find a value to spill when

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     [ http://jira.codehaus.org/browse/RVM-854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Frampton resolved RVM-854.
---------------------------------

    Resolution: Fixed

I put in a fix in r15774 but I am leaving open until someone more familiar with this code has a chance to check.

> Failed to find a value to spill when
> -------------------------------------
>
>                 Key: RVM-854
>                 URL: http://jira.codehaus.org/browse/RVM-854
>             Project: RVM
>          Issue Type: Bug
>          Components: Compiler: Optimizing
>            Reporter: Daniel Frampton
>            Assignee: Daniel Frampton
>            Priority: Minor
>             Fix For: 3.1.1
>
>
> The spill cost was being set to max int instead of max double, causing very expensive spills to be overlooked.
> The spill costs seem very high (~6E11), is this reasonable?

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[jira] Commented: (RVM-854) Failed to find a value to spill when

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    [ http://jira.codehaus.org/browse/RVM-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=189617#action_189617 ]

David Grove commented on RVM-854:
---------------------------------

In the case of an "infinite" loop,  guess it's possible that we've computed an unusually high weight for the basic block containing the spill, and that could inflate the spill cost.

Does seem awfully high though...



> Failed to find a value to spill when
> -------------------------------------
>
>                 Key: RVM-854
>                 URL: http://jira.codehaus.org/browse/RVM-854
>             Project: RVM
>          Issue Type: Bug
>          Components: Compiler: Optimizing
>            Reporter: Daniel Frampton
>            Assignee: Daniel Frampton
>            Priority: Minor
>             Fix For: 3.1.1
>
>
> The spill cost was being set to max int instead of max double, causing very expensive spills to be overlooked.
> The spill costs seem very high (~6E11), is this reasonable?

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