Vectorize through user-defined index sets #1316
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provided it can prove the size is static and divides by the vector width.
… contiguous, not varying. This is relevant for preserving vector loads when an index is offset.
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It seems that either llvm-hs or LLVM itself assumes that a pointer load or store that doesn't indicate an explicit alignment is aligned to the size of pointee. But this is wrong for vector loads from multidimensional Dex arrays---the minor dimension need only be aligned on the size of a single array element, not the whole vector.
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