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...0 (Noreg) and so, I wrote the following piece of code. ***** MRI = &MF.getRegInfo(); if (!MRI->use_nodbg_empty(0)) { for (MachineRegisterInfo::use_nodbg_iterator ri = MRI->use_nodbg_begin(0), re = MRI->use_nodbg_end(); ri != re; ++ri) { MachineInstr *UseMI = &*ri; UseMI->dump (); } } ***** But I see that UseMI is DBG_VALUE %noreg, 0, !"foobar"; line no:511 inlined @[ foo.cc:364:5 ] Also, when I want to check what "isDebugValue" returns, I get this. (gdb) p UseMI->isDebugValue() $1 = true Isn't this...

...to. Instead it tries to restore it only right before register it is freeing up. Maybe I'm misunderstanding this code. // If the target knows how to save/restore the register, let it do so; // otherwise, use the emergency stack spill slot. if (!TRI->saveScavengerRegister(*MBB, I, UseMI, RC, SReg)) { // Spill the scavenged register before I. assert(ScavengingFrameIndex >= 0 && "Cannot scavenge register without an emergency spill slot!"); TII->storeRegToStackSlot(*MBB, I, SReg, true, ScavengingFrameIndex, RC,TRI); MachineBasi...

...restore it only right before register it is freeing up. > > Maybe I'm misunderstanding this code. > > // If the target knows how to save/restore the register, let it do so; > // otherwise, use the emergency stack spill slot. > if (!TRI->saveScavengerRegister(*MBB, I, UseMI, RC, SReg)) { > // Spill the scavenged register before I. > assert(ScavengingFrameIndex >= 0 && > "Cannot scavenge register without an emergency spill slot!"); > TII->storeRegToStackSlot(*MBB, I, SReg, true, ScavengingFrameIndex, > RC,TR...

...f an itinerary is defined, you get to override two hooks: virtual int TargetInstrInfo::getOperandLatency(const InstrItineraryData *ItinData, const MachineInstr *DefMI, unsigned DefIdx, const MachineInstr *UseMI, unsigned UseIdx) const; virtual unsigned TargetInstrInfo::getInstrLatency(const InstrItineraryData *ItinData, const MachineInstr *MI, unsigned *PredCo...