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Bound ISL operations during pre-vectorization to prevent indefinite compilation. The MaxOpGuard previously used for schedule computation is now extended to also guard pre-vectorization optimizations. This patch includes a reduced test case derived from the original bug report. --------- Co-authored-by: Michael Kruse <llvm-project@meinersbur.de>
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.