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Misc. code cleanups.

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llvm-svn: 131497
This commit is contained in:
Dan Gohman 2011-05-17 22:22:52 +00:00
parent 5d23a937f7
commit 834a63625d
1 changed files with 60 additions and 61 deletions
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121
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -432,68 +432,67 @@ SDValue ExpandUnalignedStore(StoreSDNode *ST, SelectionDAG &DAG,
SDValue Result = DAG.getNode(ISD::BITCAST, dl, intVT, Val);
return DAG.getStore(Chain, dl, Result, Ptr, ST->getPointerInfo(),
ST->isVolatile(), ST->isNonTemporal(), Alignment);
} else {
// Do a (aligned) store to a stack slot, then copy from the stack slot
// to the final destination using (unaligned) integer loads and stores.
EVT StoredVT = ST->getMemoryVT();
EVT RegVT =
TLI.getRegisterType(*DAG.getContext(),
EVT::getIntegerVT(*DAG.getContext(),
StoredVT.getSizeInBits()));
unsigned StoredBytes = StoredVT.getSizeInBits() / 8;
unsigned RegBytes = RegVT.getSizeInBits() / 8;
unsigned NumRegs = (StoredBytes + RegBytes - 1) / RegBytes;
// Make sure the stack slot is also aligned for the register type.
SDValue StackPtr = DAG.CreateStackTemporary(StoredVT, RegVT);
// Perform the original store, only redirected to the stack slot.
SDValue Store = DAG.getTruncStore(Chain, dl,
Val, StackPtr, MachinePointerInfo(),
StoredVT, false, false, 0);
SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
SmallVector<SDValue, 8> Stores;
unsigned Offset = 0;
// Do all but one copies using the full register width.
for (unsigned i = 1; i < NumRegs; i++) {
// Load one integer register's worth from the stack slot.
SDValue Load = DAG.getLoad(RegVT, dl, Store, StackPtr,
MachinePointerInfo(),
false, false, 0);
// Store it to the final location. Remember the store.
Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo().getWithOffset(Offset),
ST->isVolatile(), ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// Increment the pointers.
Offset += RegBytes;
StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
Increment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
}
// The last store may be partial. Do a truncating store. On big-endian
// machines this requires an extending load from the stack slot to ensure
// that the bits are in the right place.
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
8 * (StoredBytes - Offset));
// Load from the stack slot.
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Store, StackPtr,
MachinePointerInfo(),
MemVT, false, false, 0);
Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo()
.getWithOffset(Offset),
MemVT, ST->isVolatile(),
ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// The order of the stores doesn't matter - say it with a TokenFactor.
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
Stores.size());
}
// Do a (aligned) store to a stack slot, then copy from the stack slot
// to the final destination using (unaligned) integer loads and stores.
EVT StoredVT = ST->getMemoryVT();
EVT RegVT =
TLI.getRegisterType(*DAG.getContext(),
EVT::getIntegerVT(*DAG.getContext(),
StoredVT.getSizeInBits()));
unsigned StoredBytes = StoredVT.getSizeInBits() / 8;
unsigned RegBytes = RegVT.getSizeInBits() / 8;
unsigned NumRegs = (StoredBytes + RegBytes - 1) / RegBytes;
// Make sure the stack slot is also aligned for the register type.
SDValue StackPtr = DAG.CreateStackTemporary(StoredVT, RegVT);
// Perform the original store, only redirected to the stack slot.
SDValue Store = DAG.getTruncStore(Chain, dl,
Val, StackPtr, MachinePointerInfo(),
StoredVT, false, false, 0);
SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
SmallVector<SDValue, 8> Stores;
unsigned Offset = 0;
// Do all but one copies using the full register width.
for (unsigned i = 1; i < NumRegs; i++) {
// Load one integer register's worth from the stack slot.
SDValue Load = DAG.getLoad(RegVT, dl, Store, StackPtr,
MachinePointerInfo(),
false, false, 0);
// Store it to the final location. Remember the store.
Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo().getWithOffset(Offset),
ST->isVolatile(), ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// Increment the pointers.
Offset += RegBytes;
StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
Increment);
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
}
// The last store may be partial. Do a truncating store. On big-endian
// machines this requires an extending load from the stack slot to ensure
// that the bits are in the right place.
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
8 * (StoredBytes - Offset));
// Load from the stack slot.
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Store, StackPtr,
MachinePointerInfo(),
MemVT, false, false, 0);
Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, Ptr,
ST->getPointerInfo()
.getWithOffset(Offset),
MemVT, ST->isVolatile(),
ST->isNonTemporal(),
MinAlign(ST->getAlignment(), Offset)));
// The order of the stores doesn't matter - say it with a TokenFactor.
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
Stores.size());
}
assert(ST->getMemoryVT().isInteger() &&
!ST->getMemoryVT().isVector() &&