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Change TII::foldMemoryOperand API to require the machine instruction to be 

inserted in a MBB, and return an already inserted MI.

This target API change is necessary to allow foldMemoryOperand to call
storeToStackSlot and loadFromStackSlot when folding a COPY to a stack slot
reference in a target independent way.

The foldMemoryOperandImpl hook is going to change in the same way, but I'll wait
until COPY folding is actually implemented. Most targets only fold copies and
won't need to specialize this hook at all.

llvm-svn: 107991
This commit is contained in:
Jakob Stoklund Olesen 2010-07-09 17:29:08 +00:00
parent 9d5ae03404
commit bd953d1805
6 changed files with 37 additions and 38 deletions
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12
llvm/include/llvm/Target/TargetInstrInfo.h
View File

@ -438,19 +438,17 @@ public:
/// foldMemoryOperand - Attempt to fold a load or store of the specified stack
/// slot into the specified machine instruction for the specified operand(s).
/// If this is possible, a new instruction is returned with the specified
/// operand folded, otherwise NULL is returned. The client is responsible for
/// removing the old instruction and adding the new one in the instruction
/// stream.
MachineInstr* foldMemoryOperand(MachineFunction &MF,
MachineInstr* MI,
/// operand folded, otherwise NULL is returned.
/// The new instruction is inserted before MI, and the client is responsible
/// for removing the old instruction.
MachineInstr* foldMemoryOperand(MachineBasicBlock::iterator MI,
const SmallVectorImpl<unsigned> &Ops,
int FrameIndex) const;
/// foldMemoryOperand - Same as the previous version except it allows folding
/// of any load and store from / to any address, not just from a specific
/// stack slot.
MachineInstr* foldMemoryOperand(MachineFunction &MF,
MachineInstr* MI,
MachineInstr* foldMemoryOperand(MachineBasicBlock::iterator MI,
const SmallVectorImpl<unsigned> &Ops,
MachineInstr* LoadMI) const;

5
llvm/lib/CodeGen/InlineSpiller.cpp
View File

@ -282,13 +282,12 @@ bool InlineSpiller::foldMemoryOperand(MachineBasicBlock::iterator MI,
FoldOps.push_back(Idx);
}
MachineInstr *FoldMI = tii_.foldMemoryOperand(mf_, MI, FoldOps, stackSlot_);
MachineInstr *FoldMI = tii_.foldMemoryOperand(MI, FoldOps, stackSlot_);
if (!FoldMI)
return false;
MachineBasicBlock &MBB = *MI->getParent();
lis_.ReplaceMachineInstrInMaps(MI, FoldMI);
vrm_.addSpillSlotUse(stackSlot_, FoldMI);
MBB.insert(MBB.erase(MI), FoldMI);
MI->eraseFromParent();
DEBUG(dbgs() << "\tfolded: " << *FoldMI);
return true;
}

8
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -946,22 +946,22 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
if (DefMI && (MRInfo & VirtRegMap::isMod))
return false;
MachineInstr *fmi = isSS ? tii_->foldMemoryOperand(*mf_, MI, FoldOps, Slot)
: tii_->foldMemoryOperand(*mf_, MI, FoldOps, DefMI);
MachineInstr *fmi = isSS ? tii_->foldMemoryOperand(MI, FoldOps, Slot)
: tii_->foldMemoryOperand(MI, FoldOps, DefMI);
if (fmi) {
// Remember this instruction uses the spill slot.
if (isSS) vrm.addSpillSlotUse(Slot, fmi);
// Attempt to fold the memory reference into the instruction. If
// we can do this, we don't need to insert spill code.
MachineBasicBlock &MBB = *MI->getParent();
if (isSS && !mf_->getFrameInfo()->isImmutableObjectIndex(Slot))
vrm.virtFolded(Reg, MI, fmi, (VirtRegMap::ModRef)MRInfo);
vrm.transferSpillPts(MI, fmi);
vrm.transferRestorePts(MI, fmi);
vrm.transferEmergencySpills(MI, fmi);
ReplaceMachineInstrInMaps(MI, fmi);
MI = MBB.insert(MBB.erase(MI), fmi);
MI->eraseFromParent();
MI = fmi;
++numFolds;
return true;
}

19
llvm/lib/CodeGen/PreAllocSplitting.cpp
View File

@ -863,12 +863,11 @@ MachineInstr* PreAllocSplitting::FoldSpill(unsigned vreg,
SS = MFI->CreateSpillStackObject(RC->getSize(), RC->getAlignment());
}
MachineInstr* FMI = TII->foldMemoryOperand(*MBB->getParent(),
FoldPt, Ops, SS);
MachineInstr* FMI = TII->foldMemoryOperand(FoldPt, Ops, SS);
if (FMI) {
LIs->ReplaceMachineInstrInMaps(FoldPt, FMI);
FMI = MBB->insert(MBB->erase(FoldPt), FMI);
FoldPt->eraseFromParent();
++NumFolds;
IntervalSSMap[vreg] = SS;
@ -944,12 +943,11 @@ MachineInstr* PreAllocSplitting::FoldRestore(unsigned vreg,
if (!TII->canFoldMemoryOperand(FoldPt, Ops))
return 0;
MachineInstr* FMI = TII->foldMemoryOperand(*MBB->getParent(),
FoldPt, Ops, SS);
MachineInstr* FMI = TII->foldMemoryOperand(FoldPt, Ops, SS);
if (FMI) {
LIs->ReplaceMachineInstrInMaps(FoldPt, FMI);
FMI = MBB->insert(MBB->erase(FoldPt), FMI);
FoldPt->eraseFromParent();
++NumRestoreFolds;
}
@ -1255,9 +1253,7 @@ bool PreAllocSplitting::removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split) {
Ops.push_back(OpIdx);
if (!TII->canFoldMemoryOperand(use, Ops)) continue;
MachineInstr* NewMI =
TII->foldMemoryOperand(*use->getParent()->getParent(),
use, Ops, FrameIndex);
MachineInstr* NewMI = TII->foldMemoryOperand(use, Ops, FrameIndex);
if (!NewMI) continue;
@ -1267,10 +1263,9 @@ bool PreAllocSplitting::removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split) {
(*LI)->removeValNo(CurrVN);
DefMI->eraseFromParent();
MachineBasicBlock* MBB = use->getParent();
NewMI = MBB->insert(MBB->erase(use), NewMI);
use->eraseFromParent();
VNUseCount[CurrVN].erase(use);
// Remove deleted instructions. Note that we need to remove them from
// the VNInfo->use map as well, just to be safe.
for (SmallPtrSet<MachineInstr*, 4>::iterator II =

15
llvm/lib/CodeGen/TargetInstrInfoImpl.cpp
View File

@ -197,8 +197,7 @@ TargetInstrInfoImpl::GetFunctionSizeInBytes(const MachineFunction &MF) const {
/// removing the old instruction and adding the new one in the instruction
/// stream.
MachineInstr*
TargetInstrInfo::foldMemoryOperand(MachineFunction &MF,
MachineInstr* MI,
TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
const SmallVectorImpl<unsigned> &Ops,
int FrameIndex) const {
unsigned Flags = 0;
@ -208,10 +207,15 @@ TargetInstrInfo::foldMemoryOperand(MachineFunction &MF,
else
Flags |= MachineMemOperand::MOLoad;
MachineBasicBlock &MBB = *MI->getParent();
MachineFunction &MF = *MBB.getParent();
// Ask the target to do the actual folding.
MachineInstr *NewMI = foldMemoryOperandImpl(MF, MI, Ops, FrameIndex);
if (!NewMI) return 0;
NewMI = MBB.insert(MI, NewMI);
assert((!(Flags & MachineMemOperand::MOStore) ||
NewMI->getDesc().mayStore()) &&
"Folded a def to a non-store!");
@ -234,8 +238,7 @@ TargetInstrInfo::foldMemoryOperand(MachineFunction &MF,
/// of any load and store from / to any address, not just from a specific
/// stack slot.
MachineInstr*
TargetInstrInfo::foldMemoryOperand(MachineFunction &MF,
MachineInstr* MI,
TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
const SmallVectorImpl<unsigned> &Ops,
MachineInstr* LoadMI) const {
assert(LoadMI->getDesc().canFoldAsLoad() && "LoadMI isn't foldable!");
@ -243,11 +246,15 @@ TargetInstrInfo::foldMemoryOperand(MachineFunction &MF,
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
assert(MI->getOperand(Ops[i]).isUse() && "Folding load into def!");
#endif
MachineBasicBlock &MBB = *MI->getParent();
MachineFunction &MF = *MBB.getParent();
// Ask the target to do the actual folding.
MachineInstr *NewMI = foldMemoryOperandImpl(MF, MI, Ops, LoadMI);
if (!NewMI) return 0;
NewMI = MBB.insert(MI, NewMI);
// Copy the memoperands from the load to the folded instruction.
NewMI->setMemRefs(LoadMI->memoperands_begin(),
LoadMI->memoperands_end());

16
llvm/lib/CodeGen/VirtRegRewriter.cpp
View File

@ -1409,25 +1409,25 @@ OptimizeByUnfold(MachineBasicBlock::iterator &MII,
if (TII->unfoldMemoryOperand(MF, &MI, UnfoldVR, false, false, NewMIs)) {
assert(NewMIs.size() == 1);
MachineInstr *NewMI = NewMIs.back();
MBB->insert(MII, NewMI);
NewMIs.clear();
int Idx = NewMI->findRegisterUseOperandIdx(VirtReg, false);
assert(Idx != -1);
SmallVector<unsigned, 1> Ops;
Ops.push_back(Idx);
MachineInstr *FoldedMI = TII->foldMemoryOperand(MF, NewMI, Ops, SS);
MachineInstr *FoldedMI = TII->foldMemoryOperand(NewMI, Ops, SS);
NewMI->eraseFromParent();
if (FoldedMI) {
VRM->addSpillSlotUse(SS, FoldedMI);
if (!VRM->hasPhys(UnfoldVR))
VRM->assignVirt2Phys(UnfoldVR, UnfoldPR);
VRM->virtFolded(VirtReg, FoldedMI, VirtRegMap::isRef);
MII = MBB->insert(MII, FoldedMI);
MII = FoldedMI;
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM->RemoveMachineInstrFromMaps(&MI);
MBB->erase(&MI);
MF.DeleteMachineInstr(NewMI);
return true;
}
MF.DeleteMachineInstr(NewMI);
}
}
@ -1479,7 +1479,6 @@ CommuteToFoldReload(MachineBasicBlock::iterator &MII,
if (MII == MBB->begin() || !MII->killsRegister(SrcReg))
return false;
MachineFunction &MF = *MBB->getParent();
MachineInstr &MI = *MII;
MachineBasicBlock::iterator DefMII = prior(MII);
MachineInstr *DefMI = DefMII;
@ -1510,11 +1509,12 @@ CommuteToFoldReload(MachineBasicBlock::iterator &MII,
MachineInstr *CommutedMI = TII->commuteInstruction(DefMI, true);
if (!CommutedMI)
return false;
MBB->insert(MII, CommutedMI);
SmallVector<unsigned, 1> Ops;
Ops.push_back(NewDstIdx);
MachineInstr *FoldedMI = TII->foldMemoryOperand(MF, CommutedMI, Ops, SS);
MachineInstr *FoldedMI = TII->foldMemoryOperand(CommutedMI, Ops, SS);
// Not needed since foldMemoryOperand returns new MI.
MF.DeleteMachineInstr(CommutedMI);
CommutedMI->eraseFromParent();
if (!FoldedMI)
return false;
@ -1527,7 +1527,7 @@ CommuteToFoldReload(MachineBasicBlock::iterator &MII,
MachineInstr *StoreMI = MII;
VRM->addSpillSlotUse(SS, StoreMI);
VRM->virtFolded(VirtReg, StoreMI, VirtRegMap::isMod);
MII = MBB->insert(MII, FoldedMI); // Update MII to backtrack.
MII = FoldedMI; // Update MII to backtrack.
// Delete all 3 old instructions.
InvalidateKills(*ReloadMI, TRI, RegKills, KillOps);