Also add a FIXME comment on why Mips RDDSP causes bogus dead flags to be
added which LiveVariables cleans up by accident.
llvm-svn: 264695
MO.setIsKill(false);
if (MO.readsReg())
UseRegs.push_back(MOReg);
- } else /*MO.isDef()*/ {
- if (!(TargetRegisterInfo::isPhysicalRegister(MOReg) &&
- MRI->isReserved(MOReg)))
+ } else {
+ assert(MO.isDef());
+ // FIXME: We should not remove any dead flags. Howeve the MIPS RDDSP
+ // instruction needs it at the moment: RDDSP gets its implicit use
+ // operands added too late in the processing so InstrEmitter adds an
+ // incorrect dead flag because the uses are not yet visible.
+ if (TargetRegisterInfo::isPhysicalRegister(MOReg) &&
+ !MRI->isReserved(MOReg))
MO.setIsDead(false);
DefRegs.push_back(MOReg);
}