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bdd1452784
This patch seeds the SLP vectorizer with getelementptr indices. The primary motivation in doing so is to vectorize gather-like idioms beginning with consecutive loads (e.g., g[a[0] - b[0]] + g[a[1] - b[1]] + ...). While these cases could be vectorized with a top-down phase, seeding the existing bottom-up phase with the index computations avoids the complexity, compile-time, and phase ordering issues associated with a full top-down pass. Only bundles of single-index getelementptrs with non-constant differences are considered for vectorization. Differential Revision: http://reviews.llvm.org/D14829 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257800 91177308-0d34-0410-b5e6-96231b3b80d8
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