[jira] Assigned: (HARMONY-3052) [drlvm][jit][opt] unguard configuration and value profiler improvements

["Alexey Varlamov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Varlamov reassigned HARMONY-3052:
----------------------------------------

    Assignee: Alexey Varlamov

> [drlvm][jit][opt] unguard configuration and value profiler improvements
> -----------------------------------------------------------------------
>
>                 Key: HARMONY-3052
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3052
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: Any.
>            Reporter: Pavel Ozhdikhin
>         Assigned To: Alexey Varlamov
>         Attachments: unguard_and_vp_improvements.patch
>
>
> The attached patch contains the following improvements for the High-Level Optimizer in the Jitrino.OPT JIT compiler:
> 1. "Unguard" configuration enabled in -Xem:server mode:
>       Devirtualization pass has been split to the 2 passes: devirt_vurtual and divert_intf. devirt_virtual does guarded
>       devirtualization of all virtual methods in SD1_OPT and no devirt for interface calls. During SD2_OPT phase
>       the untaken guards are removed during the unguard pass. Then devirt_intf devirtualizes interface calls basing
>       on the value profile information.
>       Please note that this patch changes the name and default value for the parameter "devirt_intf_methods" (true)
>       to "devirt_interface_calls" (false). Also one new parameter is introduced to support the sequence described
>       above: "devirt_virtual_calls" (true). 
> 2. Value profile dumps are implemented:
>      The value profile collector module now supports value profile dumps to the log stream for the debugging purpose
> 3. A number of small improvements positively affecting precision of the value profile.
> The patch has been tested on Windows/IA32, Linux/IA32 and Linux/EM64T : build test passed on Win and Lin IA32,
> on Lin/EM64T smoke test exception.FinalizeStackTest failed before and after applying the patch.

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