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This makes sure we still test the case that a PHI-NODE cannot be analyzed by scalar evolution and consequently must be code generated explicitly. As Michael's optimization triggers only on a very specific "add %iv, %step" pattern, just changing 'add' to 'mul' adds back test coverage. llvm-svn: 302132
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.