// Classify VEX_B, VEX_4V, VEX_R, VEX_X
unsigned NumOps = Desc.getNumOperands();
- unsigned CurOp = 0;
- if (NumOps > 1 && Desc.getOperandConstraint(1, MCOI::TIED_TO) == 0)
- ++CurOp;
- else if (NumOps > 3 && Desc.getOperandConstraint(2, MCOI::TIED_TO) == 0 &&
- Desc.getOperandConstraint(3, MCOI::TIED_TO) == 1)
- // Special case for AVX-512 GATHER with 2 TIED_TO operands
- // Skip the first 2 operands: dst, mask_wb
- CurOp += 2;
- else if (NumOps > 3 && Desc.getOperandConstraint(2, MCOI::TIED_TO) == 0 &&
- Desc.getOperandConstraint(NumOps - 1, MCOI::TIED_TO) == 1)
- // Special case for GATHER with 2 TIED_TO operands
- // Skip the first 2 operands: dst, mask_wb
- CurOp += 2;
- else if (NumOps > 2 && Desc.getOperandConstraint(NumOps - 2, MCOI::TIED_TO) == 0)
- // SCATTER
- ++CurOp;
+ unsigned CurOp = X86II::getOperandBias(Desc);
switch (TSFlags & X86II::FormMask) {
default: llvm_unreachable("Unexpected form in EmitVEXOpcodePrefix!");