Matthias Boehm closed SYSTEMML-1832.

> Redundant checkpoint instructions before loops
> ----------------------------------------------
>                 Key: SYSTEMML-1832
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1832
>             Project: SystemML
>          Issue Type: Bug
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
> Static rewrites include HOP DAG and statement block rewrites. We apply these 
> rewrites multiple times during compilation (e.g., rewrites followed by 
> multiple passes of IPA). Some of the static rewrites such as 
> {{RewriteInjectSparkLoopCheckpointing}} assume that they are called once for 
> a program. Applying them multiple times leads to redundant statement blocks 
> with redundant checkpoint instructions. Accordingly, IPA should explicitly 
> disable such rewrites.

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