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17c84ea594
PR14478 highlights a serious problem in SROA that simply wasn't being exercised due to a lack of vector input code mixed with C-library function calls. Part of SROA was written carefully to handle subvector accesses via memset and memcpy, but the rewriter never grew support for this. Fixing it required refactoring the subvector access code in other parts of SROA so it could be shared, and then fixing the splat formation logic and using subvector insertion (this patch). The PR isn't quite fixed yet, as memcpy is still broken in the same way. I'm starting on that series of patches now. Hopefully this will be enough to bring the bullet benchmark back to life with the bb-vectorizer enabled, but that may require fixing memcpy as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170301 91177308-0d34-0410-b5e6-96231b3b80d8 |
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