Automatic Granularity Selection And Openmp Directive Generation Via Extended Machine Descriptors In The Promis Parallelizing Compiler

This paper describes Extended Machine Descriptors (EMD) in the PROMIS multigrain compiler. EMDs extend the concept of Machine Descriptors to encompass coarser granularities of parallelism, thereby enabling high-level transformations to be quickly retargeted. Code generation for parallel runtime libraries Eke OpenMP benefit from the granularity control and automatic directive generation provided by EMDs. An overview of EMDs, their implementation in the PROMIS compiler, and a demonstration of their utility for portability and retargelability are described in this paper.