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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1871) Rework compiler/runtime predicate handling
Date Thu, 24 Aug 2017 19:43:00 GMT
Matthias Boehm created SYSTEMML-1871:
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             Summary: Rework compiler/runtime predicate handling
                 Key: SYSTEMML-1871
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1871
             Project: SystemML
          Issue Type: Sub-task
            Reporter: Matthias Boehm


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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