llvm dev - Jan 2018 - Llvm support for non-power-of-2-sized vectors

Hi,

My target can support non-power-of-2-sized vectors. My first thought is to add
the non-power-of-2 vector type to the function  MVT::getVectorVT in
MachineValueType.h, is this the correct approach?

I see code that checks for isPowOf2 for vectors in

lib<https://github.com/llvm-mirror/llvm/tree/master/lib>/CodeGen<https://github.com/llvm-mirror/llvm/tree/master/lib/CodeGen>/TargetLoweringBase.cpp

// FIXME: We don't support non-power-of-2-sized vectors for now.  Ideally we
  // could break down into LHS/RHS like LegalizeDAG does.
  if (!isPowerOf2_32(NumElts)) {
    NumVectorRegs = NumElts;
    NumElts = 1;
  }


Any suggestions on how to support non-power-of-2-sized vectors? Or maybe a
workaround?

Thanks,
-Kevin
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