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visitSIGN_EXTEND() in DAGCombiner.cpp generates an ISD::SELECT even if VT is a vector, which causes ExpandSELECT() to assert during legalization. I think what's required is to have visitSIGN_EXTEND generate a VSELECT if VT is a vector… I've tried a local change that cures this particular assert, but uncovers another assert later, so I'm a bit uncertain if I'm heading off in the