// Make sure the first definition is not a partial redefinition. Add an
// <imp-def> of the full register.
- if (MO.getSubReg())
+ // FIXME: LiveIntervals shouldn't modify the code like this. Whoever
+ // created the machine instruction should annotate it with <undef> flags
+ // as needed. Then we can simply assert here. The REG_SEQUENCE lowering
+ // is the main suspect.
+ if (MO.getSubReg()) {
mi->addRegisterDefined(interval.reg);
+ // Mark all defs of interval.reg on this instruction as reading <undef>.
+ for (unsigned i = MOIdx, e = mi->getNumOperands(); i != e; ++i) {
+ MachineOperand &MO2 = mi->getOperand(i);
+ if (MO2.isReg() && MO2.getReg() == interval.reg && MO2.getSubReg())
+ MO2.setIsUndef();
+ }
+ }
MachineInstr *CopyMI = NULL;
if (mi->isCopyLike()) {