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The final piece needed for storing arbitrary precision

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integers.  Handle truncstore of a legal type to an unusual
number of bits.  Most of this code is not reachable unless
the new legalize infrastructure is turned on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2008-01-22 07:17:34 +00:00
parent 6410510224
commit 7e857201f3
1 changed files with 91 additions and 30 deletions
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121
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -2254,38 +2254,99 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
return DAG.getTruncStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, MVT::i8, isVolatile, Alignment);
}
// Unconditionally promote TRUNCSTORE:i1 X -> TRUNCSTORE:i8 (and X, 1)
if (ST->getStoredVT() == MVT::i1) {
// Promote the bool to a mask then store.
Tmp3 = DAG.getNode(ISD::AND, Tmp3.getValueType(), Tmp3,
DAG.getConstant(1, Tmp3.getValueType()));
Result = DAG.getTruncStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, MVT::i8,
isVolatile, Alignment);
} else if (Tmp1 != ST->getChain() || Tmp3 != ST->getValue() ||
Tmp2 != ST->getBasePtr()) {
Result = DAG.UpdateNodeOperands(Result, Tmp1, Tmp3, Tmp2,
ST->getOffset());
}
MVT::ValueType StVT = cast<StoreSDNode>(Result.Val)->getStoredVT();
switch (TLI.getTruncStoreAction(ST->getValue().getValueType(), StVT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
// If this is an unaligned store and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses()) {
unsigned ABIAlignment = TLI.getTargetData()->
getABITypeAlignment(MVT::getTypeForValueType(ST->getStoredVT()));
if (ST->getAlignment() < ABIAlignment)
Result = ExpandUnalignedStore(cast<StoreSDNode>(Result.Val), DAG,
TLI);
MVT::ValueType StVT = ST->getStoredVT();
unsigned StWidth = MVT::getSizeInBits(StVT);
if (StWidth != MVT::getStoreSizeInBits(StVT)) {
// Promote to a byte-sized store with upper bits zero if not
// storing an integral number of bytes. For example, promote
// TRUNCSTORE:i1 X -> TRUNCSTORE:i8 (and X, 1)
MVT::ValueType NVT = MVT::getIntegerType(MVT::getStoreSizeInBits(StVT));
Tmp3 = DAG.getZeroExtendInReg(Tmp3, StVT);
Result = DAG.getTruncStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, NVT, isVolatile, Alignment);
} else if (StWidth & (StWidth - 1)) {
// If not storing a power-of-2 number of bits, expand as two stores.
assert(MVT::isExtendedVT(StVT) && !MVT::isVector(StVT) &&
"Unsupported truncstore!");
unsigned RoundWidth = 1 << Log2_32(StWidth);
assert(RoundWidth < StWidth);
unsigned ExtraWidth = StWidth - RoundWidth;
assert(ExtraWidth < RoundWidth);
assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
"Store size not an integral number of bytes!");
MVT::ValueType RoundVT = MVT::getIntegerType(RoundWidth);
MVT::ValueType ExtraVT = MVT::getIntegerType(ExtraWidth);
SDOperand Lo, Hi;
unsigned IncrementSize;
if (TLI.isLittleEndian()) {
// TRUNCSTORE:i24 X -> TRUNCSTORE:i16 X, TRUNCSTORE@+2:i8 (srl X, 16)
// Store the bottom RoundWidth bits.
Lo = DAG.getTruncStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, RoundVT,
isVolatile, Alignment);
// Store the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Hi = DAG.getNode(ISD::SRL, Tmp3.getValueType(), Tmp3,
DAG.getConstant(RoundWidth, TLI.getShiftAmountTy()));
Hi = DAG.getTruncStore(Tmp1, Hi, Tmp2, ST->getSrcValue(),
SVOffset + IncrementSize, ExtraVT, isVolatile,
MinAlign(Alignment, IncrementSize));
} else {
// Big endian - avoid unaligned stores.
// TRUNCSTORE:i24 X -> TRUNCSTORE:i16 (srl X, 8), TRUNCSTORE@+2:i8 X
// Store the top RoundWidth bits.
Hi = DAG.getNode(ISD::SRL, Tmp3.getValueType(), Tmp3,
DAG.getConstant(ExtraWidth, TLI.getShiftAmountTy()));
Hi = DAG.getTruncStore(Tmp1, Hi, Tmp2, ST->getSrcValue(), SVOffset,
RoundVT, isVolatile, Alignment);
// Store the remaining ExtraWidth bits.
IncrementSize = RoundWidth / 8;
Tmp2 = DAG.getNode(ISD::ADD, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(IncrementSize));
Lo = DAG.getTruncStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset + IncrementSize, ExtraVT, isVolatile,
MinAlign(Alignment, IncrementSize));
}
// The order of the stores doesn't matter.
Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
} else {
if (Tmp1 != ST->getChain() || Tmp3 != ST->getValue() ||
Tmp2 != ST->getBasePtr())
Result = DAG.UpdateNodeOperands(Result, Tmp1, Tmp3, Tmp2,
ST->getOffset());
switch (TLI.getTruncStoreAction(ST->getValue().getValueType(), StVT)) {
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
// If this is an unaligned store and the target doesn't support it,
// expand it.
if (!TLI.allowsUnalignedMemoryAccesses()) {
unsigned ABIAlignment = TLI.getTargetData()->
getABITypeAlignment(MVT::getTypeForValueType(ST->getStoredVT()));
if (ST->getAlignment() < ABIAlignment)
Result = ExpandUnalignedStore(cast<StoreSDNode>(Result.Val), DAG,
TLI);
}
break;
case TargetLowering::Custom:
Result = TLI.LowerOperation(Result, DAG);
break;
case Expand:
// TRUNCSTORE:i16 i32 -> STORE i16
assert(isTypeLegal(StVT) && "Do not know how to expand this store!");
Tmp3 = DAG.getNode(ISD::TRUNCATE, StVT, Tmp3);
Result = DAG.getStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(), SVOffset,
isVolatile, Alignment);
break;
}
break;
case TargetLowering::Custom:
Result = TLI.LowerOperation(Result, DAG);
break;
}
}
break;