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94e851fedf
GlobalOpt can slice structs/arrays and change GEPs in the process, but it was not updating alignments for load/store users. This eventually causes the crashing seen in: https://llvm.org/PR49661 https://llvm.org/PR50253 On x86, this required SLP+codegen to create an aligned vector store on an invalid address. The bugs would be easier to demonstrate on a target with stricter alignment requirements. I'm not sure if this is a complete solution. The alignment updating code is adapted from InstCombine, so I assume that part is tested and good. Differential Revision: https://reviews.llvm.org/D102552 |
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