[llvm-dev] Llvm support for non-power-of-2-sized vectors

kevin lin via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 29 12:12:50 PST 2018


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


// 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?

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