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... but instead rely on the assumptions that we derive for load/store instructions. Before we were able to delinearize arrays, we used GEP pointer instructions to derive information about the likely range of induction variables, which gave us more freedom during loop scheduling. Today, this is not needed any more as we delinearize multi-dimensional memory accesses and as part of this process also "assume" that all accesses to these arrays remain inbounds. The old derive-assumptions-from-GEP code has consequently become mostly redundant. We drop it both to clean up our code, but also to improve compile time. This change reduces the scop construction time for 3mm in no-asserts mode on my machine from 48 to 37 ms. llvm-svn: 280601 |
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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.