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2020 Mar 19
2
large slowdown in DAGCombiner::MergeConsecutiveStores
Hello all, We are seeing a large compiler performance regression in moving from LLVM 6.0.1 to 8.0.1. We have a long function (~50000 instructions) that used to compile in about a minute but now takes at least an hour. All the time is in MergeConsecutiveStores, I believe due to super-linear behavior in analyzing very long chains of stores. For example, this change makes the problem go away: ```