/// a register. The case of adding a (possibly relocatable) constant to a
/// register can be improved, but it is wrong to substitute Reg+Reg for
/// Reg in an asm, because the load or store opcode would have to change.
- bool SelectInlineAsmMemoryOperand(const SDValue &Op,
+ bool SelectInlineAsmMemoryOperand(const SDValue &Op,
char ConstraintCode,
std::vector<SDValue> &OutOps) override {
- OutOps.push_back(Op);
+ // We need to make sure that this one operand does not end up in r0
+ // (because we might end up lowering this as 0(%op)).
+ const TargetRegisterInfo *TRI = TM.getSubtargetImpl()->getRegisterInfo();
+ const TargetRegisterClass *TRC = TRI->getPointerRegClass(*MF, /*Kind=*/1);
+ SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
+ SDValue NewOp =
+ SDValue(CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
+ SDLoc(Op), Op.getValueType(),
+ Op, RC), 0);
+
+ OutOps.push_back(NewOp);
return false;
}