[ https://issues.apache.org/jira/browse/SYSTEMML-1871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias Boehm closed SYSTEMML-1871. ------------------------------------ > 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)