[jira] Commented: (HARMONY-2874) [drlvm][jit] Scalar replacement implementation

["Natalya Golovleva (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-2874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463286 ] 

Natalya Golovleva commented on HARMONY-2874:
--------------------------------------------

The latest patch for scalar replacement optimization (scalar.3.patch) was tested on windows only.
The problem with NullPoinerException for method escaped class instances was resolved.
The escape pipeline step should be used as 'escape,dessa,ssa' in configuration file. This is a temporary decision.
This sequence need to be placed before inline_helpers pipeline step in SD2_OPT optimization pass.

-XDjit.SD2_OPT.path.optimizer=...,simplify,dce,uce,lazyexc,escape,dessa,ssa,inline_helpers,purge,simplify,...

The following flags may be used for scalar replacement optimization:

-XDjit.SD2_OPT.arg.optimizer.escape.do_scalar_repl=yes   (default - no)
-XDjit.SD2_OPT.arg.optimizer.escape.do_esc_scalar_repl=yes   (default - no)  - to optimize method escaped objects
-XDjit.SD2_OPT.arg.optimizer.escape.do_scalar_repl_only_final_fields=yes (default - no) - to optimize objects with final fiels only


> [drlvm][jit] Scalar replacement implementation
> ----------------------------------------------
>
>                 Key: HARMONY-2874
>                 URL: https://issues.apache.org/jira/browse/HARMONY-2874
>             Project: Harmony
>          Issue Type: New Feature
>          Components: DRLVM
>            Reporter: Natalya Golovleva
>         Attachments: scalar.1.patch, scalar.1.patch, scalar.3.patch
>
>
> This is a preliminary part of the scalar replacement optimization for IA-32. 
> It uses escape analysis and may be applied for 
>   - local class instances and  local arrays,
>   - method escaped class instances.
> Not ready for commit yet.

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