[ET Trac] [Einstein Toolkit] #1020: Reduce WeylScal4 code size

[Einstein Toolkit]

#1020: Reduce WeylScal4 code size
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  Reporter:  eschnett               |       Owner:        
      Type:  enhancement            |      Status:  review
  Priority:  major                  |   Milestone:        
 Component:  EinsteinToolkit thorn  |     Version:        
Resolution:                         |    Keywords:        
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Comment (by hinder):

 At the moment, I am reluctant to support this patch.  The expressions
 become less readable and are now different to the expressions in the
 original paper they were copied from, making them less verifiable.  Erik's
 comment that his UseCSE solution doesn't look any nicer than the original
 applies only if you read all the code (i.e. the expression and the hint).
 In the new form, the actual expression is in the form that the reader
 expects, and might be checking from a paper. The CSE hint is something the
 user can ignore, as Kranc guarantees that this is only an optimisation,
 and not a change in functionality.  I would like for the source
 expressions to be directly comparable with the paper they are based on.

 The original reason for wanting to implement this change was due to a
 build failure on BlueGene/Q.  Does the code still fail to build, now that
 some of the Riemann symmetries have been implemented?  If it now builds
 successfully, then in my opinion it is better to have simpler, more
 readable Kranc source than to reduce the build time and size of the
 generated C++.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1020#comment:9>
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