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At code generation, scalar reads are generated before the other statement's instructions, respectively scalar writes after them, in contrast to array accesses which are "executed" with the instructions they are linked to. Therefore it makes sense to not map the scalar accesses to a place of execution. Follow-up patches will also remove some of the directs links from a scalar access to a single instruction, such that only having array accesses in InstructionToAccess ensures consistency. Differential Revision: http://reviews.llvm.org/D13676 llvm-svn: 256298
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.