TargetRegisterInfo::isVirtualRegister(To))
MRI.constrainRegClass(To, MRI.getRegClass(From));
// Replace it.
+
+
+ // Replacing one register with another won't touch the kill flags.
+ // We need to conservatively clear the kill flags as a kill on the old
+ // register might dominate existing uses of the new register.
+ if (!MRI.use_empty(To))
+ MRI.clearKillFlags(From);
MRI.replaceRegWith(From, To);
}
SDNode
*SelectionDAGISel::Select_READ_REGISTER(SDNode *Op) {
SDLoc dl(Op);
- MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(Op->getOperand(0));
+ MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(Op->getOperand(1));
const MDString *RegStr = dyn_cast<MDString>(MD->getMD()->getOperand(0));
unsigned Reg =
TLI->getRegisterByName(RegStr->getString().data(), Op->getValueType(0));
SDValue New = CurDAG->getCopyFromReg(
- CurDAG->getEntryNode(), dl, Reg, Op->getValueType(0));
+ Op->getOperand(0), dl, Reg, Op->getValueType(0));
New->setNodeId(-1);
return New.getNode();
}
unsigned Reg = TLI->getRegisterByName(RegStr->getString().data(),
Op->getOperand(2).getValueType());
SDValue New = CurDAG->getCopyToReg(
- CurDAG->getEntryNode(), dl, Reg, Op->getOperand(2));
+ Op->getOperand(0), dl, Reg, Op->getOperand(2));
New->setNodeId(-1);
return New.getNode();
}