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Due to the nature of the beat system in the MVE architecture, along with tail predication and low-overhead loops, unrolling has less benefit compared to normal loops. You can not, for example, hide the latency of a load with other instructions as you can for scalar code. Preventing unrolling also makes the code easier to read and reason about. So if a loop contains vector code, don't enable the runtime unrolling. At least for the time being. Differential Revision: https://reviews.llvm.org/D65803 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368530 91177308-0d34-0410-b5e6-96231b3b80d8