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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SYSTEMML-1871) Rework compiler/runtime predicate handling
Date Sat, 02 Sep 2017 23:36:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-1871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm resolved SYSTEMML-1871.
--------------------------------------
    Resolution: Done
      Assignee: Matthias Boehm

> Rework compiler/runtime predicate handling
> ------------------------------------------
>
>                 Key: SYSTEMML-1871
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1871
>             Project: SystemML
>          Issue Type: Sub-task
>          Components: Compiler
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> Currently, the handling of if, while, and for predicates exhibits a couple of shortcomings.
First, there are different representations for operations (as single-root HOP DAGs) and literals
(as dedicated constants). Second, the runtime has to explicitly find intermediate variable
names, remove rmvar instructions, which is brittle and error-prone. Third, the special handling
of operations vs literals renders constant folding during dynamic recompilation invalid because,
we would have to handle the transitioning from operation DAGs to constants accordingly. 
> This task aims to resolve all these issues, by properly compiling transient writes to
special predicate variables (e.g., _pred that are guaranteed not to conflict with external
variables). This requires a complete rework of the entire predicate handling during compilation
and runtime.



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