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Factor out a couple of helpers.

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llvm-svn: 72992
This commit is contained in:
Eli Friedman 2009-06-06 07:04:42 +00:00
parent 4395222136
commit 85675e8547
1 changed files with 101 additions and 78 deletions
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179
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -116,6 +116,8 @@ private:
/// result.
SDValue LegalizeOp(SDValue O);
SDValue OptimizeFloatStore(StoreSDNode *ST);
/// PerformInsertVectorEltInMemory - Some target cannot handle a variable
/// insertion index for the INSERT_VECTOR_ELT instruction. In this case, it
/// is necessary to spill the vector being inserted into to memory, perform
@ -165,6 +167,7 @@ private:
SDValue ExpandBitCount(unsigned Opc, SDValue Op, DebugLoc dl);
SDValue ExpandExtractFromVectorThroughStack(SDValue Op);
SDValue ExpandVectorBuildThroughStack(SDNode* Node);
void ExpandNode(SDNode *Node, SmallVectorImpl<SDValue> &Results);
void PromoteNode(SDNode *Node, SmallVectorImpl<SDValue> &Results);
@ -681,6 +684,59 @@ ExpandINSERT_VECTOR_ELT(SDValue Vec, SDValue Val, SDValue Idx, DebugLoc dl) {
return PerformInsertVectorEltInMemory(Vec, Val, Idx, dl);
}
SDValue SelectionDAGLegalize::OptimizeFloatStore(StoreSDNode* ST) {
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
// FIXME: We shouldn't do this for TargetConstantFP's.
// FIXME: move this to the DAG Combiner! Note that we can't regress due
// to phase ordering between legalized code and the dag combiner. This
// probably means that we need to integrate dag combiner and legalizer
// together.
// We generally can't do this one for long doubles.
SDValue Tmp1 = ST->getChain();
SDValue Tmp2 = ST->getBasePtr();
SDValue Tmp3;
int SVOffset = ST->getSrcValueOffset();
unsigned Alignment = ST->getAlignment();
bool isVolatile = ST->isVolatile();
DebugLoc dl = ST->getDebugLoc();
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(ST->getValue())) {
if (CFP->getValueType(0) == MVT::f32 &&
getTypeAction(MVT::i32) == Legal) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().
bitcastToAPInt().zextOrTrunc(32),
MVT::i32);
return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
} else if (CFP->getValueType(0) == MVT::f64) {
// If this target supports 64-bit registers, do a single 64-bit store.
if (getTypeAction(MVT::i64) == Legal) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().bitcastToAPInt().
zextOrTrunc(64), MVT::i64);
return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
} else if (getTypeAction(MVT::i32) == Legal && !ST->isVolatile()) {
// Otherwise, if the target supports 32-bit registers, use 2 32-bit
// stores. If the target supports neither 32- nor 64-bits, this
// xform is certainly not worth it.
const APInt &IntVal =CFP->getValueAPF().bitcastToAPInt();
SDValue Lo = DAG.getConstant(APInt(IntVal).trunc(32), MVT::i32);
SDValue Hi = DAG.getConstant(IntVal.lshr(32).trunc(32), MVT::i32);
if (TLI.isBigEndian()) std::swap(Lo, Hi);
Lo = DAG.getStore(Tmp1, dl, Lo, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(4));
Hi = DAG.getStore(Tmp1, dl, Hi, Tmp2, ST->getSrcValue(), SVOffset+4,
isVolatile, MinAlign(Alignment, 4U));
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
}
}
}
return SDValue();
}
/// LegalizeOp - We know that the specified value has a legal type, and
/// that its operands are legal. Now ensure that the operation itself
/// is legal, recursively ensuring that the operands' operations remain
@ -1293,50 +1349,9 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
bool isVolatile = ST->isVolatile();
if (!ST->isTruncatingStore()) {
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
// FIXME: We shouldn't do this for TargetConstantFP's.
// FIXME: move this to the DAG Combiner! Note that we can't regress due
// to phase ordering between legalized code and the dag combiner. This
// probably means that we need to integrate dag combiner and legalizer
// together.
// We generally can't do this one for long doubles.
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(ST->getValue())) {
if (CFP->getValueType(0) == MVT::f32 &&
getTypeAction(MVT::i32) == Legal) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().
bitcastToAPInt().zextOrTrunc(32),
MVT::i32);
Result = DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
break;
} else if (CFP->getValueType(0) == MVT::f64) {
// If this target supports 64-bit registers, do a single 64-bit store.
if (getTypeAction(MVT::i64) == Legal) {
Tmp3 = DAG.getConstant(CFP->getValueAPF().bitcastToAPInt().
zextOrTrunc(64), MVT::i64);
Result = DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
break;
} else if (getTypeAction(MVT::i32) == Legal && !ST->isVolatile()) {
// Otherwise, if the target supports 32-bit registers, use 2 32-bit
// stores. If the target supports neither 32- nor 64-bits, this
// xform is certainly not worth it.
const APInt &IntVal =CFP->getValueAPF().bitcastToAPInt();
SDValue Lo = DAG.getConstant(APInt(IntVal).trunc(32), MVT::i32);
SDValue Hi = DAG.getConstant(IntVal.lshr(32).trunc(32), MVT::i32);
if (TLI.isBigEndian()) std::swap(Lo, Hi);
Lo = DAG.getStore(Tmp1, dl, Lo, Tmp2, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
DAG.getIntPtrConstant(4));
Hi = DAG.getStore(Tmp1, dl, Hi, Tmp2, ST->getSrcValue(), SVOffset+4,
isVolatile, MinAlign(Alignment, 4U));
Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
break;
}
}
if (SDNode *OptStore = OptimizeFloatStore(ST).getNode()) {
Result = SDValue(OptStore, 0);
break;
}
{
@ -1510,6 +1525,46 @@ SDValue SelectionDAGLegalize::ExpandExtractFromVectorThroughStack(SDValue Op) {
return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr, NULL, 0);
}
SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
// We can't handle this case efficiently. Allocate a sufficiently
// aligned object on the stack, store each element into it, then load
// the result as a vector.
// Create the stack frame object.
MVT VT = Node->getValueType(0);
MVT OpVT = Node->getOperand(0).getValueType();
DebugLoc dl = Node->getDebugLoc();
SDValue FIPtr = DAG.CreateStackTemporary(VT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
const Value *SV = PseudoSourceValue::getFixedStack(FI);
// Emit a store of each element to the stack slot.
SmallVector<SDValue, 8> Stores;
unsigned TypeByteSize = OpVT.getSizeInBits() / 8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
// Ignore undef elements.
if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
unsigned Offset = TypeByteSize*i;
SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl, Node->getOperand(i),
Idx, SV, Offset));
}
SDValue StoreChain;
if (!Stores.empty()) // Not all undef elements?
StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&Stores[0], Stores.size());
else
StoreChain = DAG.getEntryNode();
// Result is a load from the stack slot.
return DAG.getLoad(VT, dl, StoreChain, FIPtr, SV, 0);
}
SDValue SelectionDAGLegalize::ExpandFCOPYSIGN(SDNode* Node) {
DebugLoc dl = Node->getDebugLoc();
SDValue Tmp1 = Node->getOperand(0);
@ -1853,40 +1908,8 @@ SDValue SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
}
}
// Otherwise, we can't handle this case efficiently. Allocate a sufficiently
// aligned object on the stack, store each element into it, then load
// the result as a vector.
// Create the stack frame object.
SDValue FIPtr = DAG.CreateStackTemporary(VT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
const Value *SV = PseudoSourceValue::getFixedStack(FI);
// Emit a store of each element to the stack slot.
SmallVector<SDValue, 8> Stores;
unsigned TypeByteSize = OpVT.getSizeInBits() / 8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
// Ignore undef elements.
if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
unsigned Offset = TypeByteSize*i;
SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl, Node->getOperand(i),
Idx, SV, Offset));
}
SDValue StoreChain;
if (!Stores.empty()) // Not all undef elements?
StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&Stores[0], Stores.size());
else
StoreChain = DAG.getEntryNode();
// Result is a load from the stack slot.
return DAG.getLoad(VT, dl, StoreChain, FIPtr, SV, 0);
// Otherwise, we can't handle this case efficiently.
return ExpandVectorBuildThroughStack(Node);
}
// ExpandLibCall - Expand a node into a call to a libcall. If the result value