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Transfer physical register spill info when load / store folding happens.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48246 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-11 21:34:46 +00:00
parent 9736028d84
commit c1f53c7426
3 changed files with 20 additions and 1 deletions
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1
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -779,6 +779,7 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
vrm.virtFolded(Reg, MI, fmi, (VirtRegMap::ModRef)MRInfo);
vrm.transferSpillPts(MI, fmi);
vrm.transferRestorePts(MI, fmi);
vrm.transferEmergencySpills(MI, fmi);
mi2iMap_.erase(MI);
i2miMap_[InstrIdx /InstrSlots::NUM] = fmi;
mi2iMap_[fmi] = InstrIdx;

3
lib/CodeGen/VirtRegMap.cpp
View File

@ -35,6 +35,7 @@
using namespace llvm;
STATISTIC(NumSpills, "Number of register spills");
STATISTIC(NumPSpills,"Number of physical register spills");
STATISTIC(NumReMats, "Number of re-materialization");
STATISTIC(NumDRM , "Number of re-materializable defs elided");
STATISTIC(NumStores, "Number of stores added");
@ -1079,7 +1080,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
TII->loadRegFromStackSlot(MBB, next(MII), PhysReg, SS, RC);
MachineInstr *LoadMI = next(MII);
VRM.addSpillSlotUse(SS, LoadMI);
++NumSpills;
++NumPSpills;
}
}

17
lib/CodeGen/VirtRegMap.h
View File

@ -268,6 +268,8 @@ namespace llvm {
}
}
/// @brief - transfer spill point information from one instruction to
/// another.
void transferSpillPts(MachineInstr *Old, MachineInstr *New) {
std::map<MachineInstr*,std::vector<std::pair<unsigned,bool> > >::iterator
I = SpillPt2VirtMap.find(Old);
@ -343,6 +345,21 @@ namespace llvm {
return EmergencySpillMap[MI];
}
/// @brief - transfer emergency spill information from one instruction to
/// another.
void transferEmergencySpills(MachineInstr *Old, MachineInstr *New) {
std::map<MachineInstr*,std::vector<unsigned> >::iterator I =
EmergencySpillMap.find(Old);
if (I == EmergencySpillMap.end())
return;
while (!I->second.empty()) {
unsigned virtReg = I->second.back();
I->second.pop_back();
addEmergencySpill(virtReg, New);
}
EmergencySpillMap.erase(I);
}
/// @brief return or get a emergency spill slot for the register class.
int getEmergencySpillSlot(const TargetRegisterClass *RC);