if (ADI && ADI->getDef()->getName() == "zero_reg") {
// Check if this is an optional def.
- if (!InstOpRec->isSubClassOf("OptionalDefOperand"))
- throw TGError(Loc, "reg0 used for result that is not an "
- "OptionalDefOperand!");
+ // Tied operands where the source is a sub-operand of a complex operand
+ // need to represent both operands in the alias destination instruction.
+ // Allow zero_reg for the tied portion. This can and should go away once
+ // the MC representation of things doesn't use tied operands at all.
+ //if (!InstOpRec->isSubClassOf("OptionalDefOperand"))
+ // throw TGError(Loc, "reg0 used for result that is not an "
+ // "OptionalDefOperand!");
ResOp = ResultOperand(static_cast<Record*>(0));
return true;
unsigned AliasOpNo = 0;
for (unsigned i = 0, e = ResultInst->Operands.size(); i != e; ++i) {
- // Tied registers don't have an entry in the result dag.
- if (ResultInst->Operands[i].getTiedRegister() != -1)
+ // Tied registers don't have an entry in the result dag unless they're part
+ // of a complex operand, in which case we include them anyways, as we
+ // don't have any other way to specify the whole operand.
+ if (ResultInst->Operands[i].MINumOperands == 1 &&
+ ResultInst->Operands[i].getTiedRegister() != -1)
continue;
if (AliasOpNo >= Result->getNumArgs())