Displaying 1 result from an estimated 1 matches for "295d97da".
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:
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