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DTSTART;TZID=America/Chicago:20211114T143200
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UID:submissions.supercomputing.org_SC21_sess431_ws_llvmlt105@linklings.com
SUMMARY:Loop Transformations Using Clang's Abstract Syntax Tree
DESCRIPTION:Workshop\n\nLoop Transformations Using Clang's Abstract Syntax
  Tree\n\nKruse\n\nOpenMP 5.1 introduced the first loop nest transformation
  directives unroll and tile, and more are expected to be included in OpenM
 P 6.0.  We discuss the two Abstract Syntax Tree (AST) representations used
  by Clang's implementation that is currently under development.  The first
  representation is designed for compatibility with the existing implementa
 tion and stores the transformed loop nest in a shadow AST next to the synt
 actical AST.  The second representation introduces a new meta AST-node OMP
 CanonicalLoop that guarantees that the semantic requirements of an OpenMP 
 loop are met, and a CanonicalLoopInfo type that the OpenMPIRBuilder uses t
 o represent literal and transformed loops.  This second approach provides 
 a better abstraction of loop semantics, removes the need for shadow AST no
 des that are only relevant for code generation, allows sharing the impleme
 ntation with other front-ends such as Flang, but depends on the OpenMPIRBu
 ilder which is currently under development.\n\nTag: Parallel Programming S
 ystems\n\nRegistration Category: Workshop Reg Pass
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