forked from OSchip/llvm-project
e8df5bd92b
In the classical (non -polly-codegen-scev) mode, we assume that we can always recreate PHI nodes during code generation. This is not true. We can only reconstruct them from the polyhedral information, in case the entire loop of the PHI node is part of the SCoP and consequently the PHI node was translated in the polyhedral description. llvm-svn: 179674 |
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README
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.