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https://issues.apache.org/jira/browse/SYSTEMML-1871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Glenn Weidner updated SYSTEMML-1871:
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Fix Version/s: (was: SystemML 1.0)
SystemML 0.15
> 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 0.15
>
>
> 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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