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From "Pavel Ozhdikhin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3052) [drlvm][jit][opt] unguard configuration and value profiler improvements
Date Wed, 24 Jan 2007 15:42:49 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467057

Pavel Ozhdikhin commented on HARMONY-3052:

Update on patch testing: 'build test' passed on Linux/EM64T cleanly (first time I did not
specify -Dos.arch=x86_64 that caused picking up a wrong exclude list.

> [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
>         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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