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When doing SCEV based code generation, we ignore instructions calculating values that are fully defined by a SCEV expression. The values that are calculated by this instructions are recalculated on demand. This commit improves the check to verify if certain instructions can be ignored and recalculated on demand. llvm-svn: 177313
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.