goto next_super_reg;
}
+ // We cannot rename 'Reg' to 'NewReg' if one of the uses of 'Reg' also
+ // defines 'NewReg' via an early-clobber operand.
+ auto Range = RegRefs.equal_range(Reg);
+ for (auto Q = Range.first, QE = Range.second; Q != QE; ++Q) {
+ auto UseMI = Q->second.Operand->getParent();
+ int Idx = UseMI->findRegisterDefOperandIdx(NewReg, false, true, TRI);
+ if (Idx == -1)
+ continue;
+
+ if (UseMI->getOperand(Idx).isEarlyClobber()) {
+ DEBUG(dbgs() << "(ec)");
+ goto next_super_reg;
+ }
+ }
+
// Record that 'Reg' can be renamed to 'NewReg'.
RenameMap.insert(std::pair<unsigned, unsigned>(Reg, NewReg));
}