================ @@ -1429,7 +1444,8 @@ def ProcessorFeatures { TuningFastScalarShiftMasks, TuningBranchFusion, TuningSBBDepBreaking, - TuningInsertVZEROUPPER]; + TuningInsertVZEROUPPER, + TuningAvoidMFENCE]; ---------------- vchuravy wrote: Done! https://github.com/llvm/llvm-project/pull/106555