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llvm-mirror/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
Dan Gohman bab18cae46 Clean up the use of static and anonymous namespaces. This turned up 
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017
2008-05-13 00:00:25 +00:00

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//===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This implements the SelectionDAG class.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Constants.h"
#include "llvm/GlobalAlias.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Intrinsics.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CallingConv.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
#include <cmath>
using namespace llvm;
/// makeVTList - Return an instance of the SDVTList struct initialized with the
/// specified members.
static SDVTList makeVTList(const MVT::ValueType *VTs, unsigned NumVTs) {
SDVTList Res = {VTs, NumVTs};
return Res;
}
static const fltSemantics *MVTToAPFloatSemantics(MVT::ValueType VT) {
switch (VT) {
default: assert(0 && "Unknown FP format");
case MVT::f32: return &APFloat::IEEEsingle;
case MVT::f64: return &APFloat::IEEEdouble;
case MVT::f80: return &APFloat::x87DoubleExtended;
case MVT::f128: return &APFloat::IEEEquad;
case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
}
}
SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
//===----------------------------------------------------------------------===//
// ConstantFPSDNode Class
//===----------------------------------------------------------------------===//
/// isExactlyValue - We don't rely on operator== working on double values, as
/// it returns true for things that are clearly not equal, like -0.0 and 0.0.
/// As such, this method can be used to do an exact bit-for-bit comparison of
/// two floating point values.
bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
return Value.bitwiseIsEqual(V);
}
bool ConstantFPSDNode::isValueValidForType(MVT::ValueType VT,
const APFloat& Val) {
assert(MVT::isFloatingPoint(VT) && "Can only convert between FP types");
// PPC long double cannot be converted to any other type.
if (VT == MVT::ppcf128 ||
&Val.getSemantics() == &APFloat::PPCDoubleDouble)
return false;
// convert modifies in place, so make a copy.
APFloat Val2 = APFloat(Val);
return Val2.convert(*MVTToAPFloatSemantics(VT),
APFloat::rmNearestTiesToEven) == APFloat::opOK;
}
//===----------------------------------------------------------------------===//
// ISD Namespace
//===----------------------------------------------------------------------===//
/// isBuildVectorAllOnes - Return true if the specified node is a
/// BUILD_VECTOR where all of the elements are ~0 or undef.
bool ISD::isBuildVectorAllOnes(const SDNode *N) {
// Look through a bit convert.
if (N->getOpcode() == ISD::BIT_CONVERT)
N = N->getOperand(0).Val;
if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
unsigned i = 0, e = N->getNumOperands();
// Skip over all of the undef values.
while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
++i;
// Do not accept an all-undef vector.
if (i == e) return false;
// Do not accept build_vectors that aren't all constants or which have non-~0
// elements.
SDOperand NotZero = N->getOperand(i);
if (isa<ConstantSDNode>(NotZero)) {
if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue())
return false;
} else if (isa<ConstantFPSDNode>(NotZero)) {
if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF().
convertToAPInt().isAllOnesValue())
return false;
} else
return false;
// Okay, we have at least one ~0 value, check to see if the rest match or are
// undefs.
for (++i; i != e; ++i)
if (N->getOperand(i) != NotZero &&
N->getOperand(i).getOpcode() != ISD::UNDEF)
return false;
return true;
}
/// isBuildVectorAllZeros - Return true if the specified node is a
/// BUILD_VECTOR where all of the elements are 0 or undef.
bool ISD::isBuildVectorAllZeros(const SDNode *N) {
// Look through a bit convert.
if (N->getOpcode() == ISD::BIT_CONVERT)
N = N->getOperand(0).Val;
if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
unsigned i = 0, e = N->getNumOperands();
// Skip over all of the undef values.
while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
++i;
// Do not accept an all-undef vector.
if (i == e) return false;
// Do not accept build_vectors that aren't all constants or which have non-~0
// elements.
SDOperand Zero = N->getOperand(i);
if (isa<ConstantSDNode>(Zero)) {
if (!cast<ConstantSDNode>(Zero)->isNullValue())
return false;
} else if (isa<ConstantFPSDNode>(Zero)) {
if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero())
return false;
} else
return false;
// Okay, we have at least one ~0 value, check to see if the rest match or are
// undefs.
for (++i; i != e; ++i)
if (N->getOperand(i) != Zero &&
N->getOperand(i).getOpcode() != ISD::UNDEF)
return false;
return true;
}
/// isScalarToVector - Return true if the specified node is a
/// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
/// element is not an undef.
bool ISD::isScalarToVector(const SDNode *N) {
if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
return true;
if (N->getOpcode() != ISD::BUILD_VECTOR)
return false;
if (N->getOperand(0).getOpcode() == ISD::UNDEF)
return false;
unsigned NumElems = N->getNumOperands();
for (unsigned i = 1; i < NumElems; ++i) {
SDOperand V = N->getOperand(i);
if (V.getOpcode() != ISD::UNDEF)
return false;
}
return true;
}
/// isDebugLabel - Return true if the specified node represents a debug
/// label (i.e. ISD::LABEL or TargetInstrInfo::LABEL node and third operand
/// is 0).
bool ISD::isDebugLabel(const SDNode *N) {
SDOperand Zero;
if (N->getOpcode() == ISD::LABEL)
Zero = N->getOperand(2);
else if (N->isTargetOpcode() &&
N->getTargetOpcode() == TargetInstrInfo::LABEL)
// Chain moved to last operand.
Zero = N->getOperand(1);
else
return false;
return isa<ConstantSDNode>(Zero) && cast<ConstantSDNode>(Zero)->isNullValue();
}
/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
/// when given the operation for (X op Y).
ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
// To perform this operation, we just need to swap the L and G bits of the
// operation.
unsigned OldL = (Operation >> 2) & 1;
unsigned OldG = (Operation >> 1) & 1;
return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits
(OldL << 1) | // New G bit
(OldG << 2)); // New L bit.
}
/// getSetCCInverse - Return the operation corresponding to !(X op Y), where
/// 'op' is a valid SetCC operation.
ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) {
unsigned Operation = Op;
if (isInteger)
Operation ^= 7; // Flip L, G, E bits, but not U.
else
Operation ^= 15; // Flip all of the condition bits.
if (Operation > ISD::SETTRUE2)
Operation &= ~8; // Don't let N and U bits get set.
return ISD::CondCode(Operation);
}
/// isSignedOp - For an integer comparison, return 1 if the comparison is a
/// signed operation and 2 if the result is an unsigned comparison. Return zero
/// if the operation does not depend on the sign of the input (setne and seteq).
static int isSignedOp(ISD::CondCode Opcode) {
switch (Opcode) {
default: assert(0 && "Illegal integer setcc operation!");
case ISD::SETEQ:
case ISD::SETNE: return 0;
case ISD::SETLT:
case ISD::SETLE:
case ISD::SETGT:
case ISD::SETGE: return 1;
case ISD::SETULT:
case ISD::SETULE:
case ISD::SETUGT:
case ISD::SETUGE: return 2;
}
}
/// getSetCCOrOperation - Return the result of a logical OR between different
/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
/// returns SETCC_INVALID if it is not possible to represent the resultant
/// comparison.
ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
bool isInteger) {
if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
// Cannot fold a signed integer setcc with an unsigned integer setcc.
return ISD::SETCC_INVALID;
unsigned Op = Op1 | Op2; // Combine all of the condition bits.
// If the N and U bits get set then the resultant comparison DOES suddenly
// care about orderedness, and is true when ordered.
if (Op > ISD::SETTRUE2)
Op &= ~16; // Clear the U bit if the N bit is set.
// Canonicalize illegal integer setcc's.
if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
Op = ISD::SETNE;
return ISD::CondCode(Op);
}
/// getSetCCAndOperation - Return the result of a logical AND between different
/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
/// function returns zero if it is not possible to represent the resultant
/// comparison.
ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
bool isInteger) {
if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
// Cannot fold a signed setcc with an unsigned setcc.
return ISD::SETCC_INVALID;
// Combine all of the condition bits.
ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
// Canonicalize illegal integer setcc's.
if (isInteger) {
switch (Result) {
default: break;
case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
}
}
return Result;
}
const TargetMachine &SelectionDAG::getTarget() const {
return TLI.getTargetMachine();
}
//===----------------------------------------------------------------------===//
// SDNode Profile Support
//===----------------------------------------------------------------------===//
/// AddNodeIDOpcode - Add the node opcode to the NodeID data.
///
static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
ID.AddInteger(OpC);
}
/// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
/// solely with their pointer.
static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
ID.AddPointer(VTList.VTs);
}
/// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
///
static void AddNodeIDOperands(FoldingSetNodeID &ID,
SDOperandPtr Ops, unsigned NumOps) {
for (; NumOps; --NumOps, ++Ops) {
ID.AddPointer(Ops->Val);
ID.AddInteger(Ops->ResNo);
}
}
static void AddNodeIDNode(FoldingSetNodeID &ID,
unsigned short OpC, SDVTList VTList,
SDOperandPtr OpList, unsigned N) {
AddNodeIDOpcode(ID, OpC);
AddNodeIDValueTypes(ID, VTList);
AddNodeIDOperands(ID, OpList, N);
}
/// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
/// data.
static void AddNodeIDNode(FoldingSetNodeID &ID, SDNode *N) {
AddNodeIDOpcode(ID, N->getOpcode());
// Add the return value info.
AddNodeIDValueTypes(ID, N->getVTList());
// Add the operand info.
AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
// Handle SDNode leafs with special info.
switch (N->getOpcode()) {
default: break; // Normal nodes don't need extra info.
case ISD::ARG_FLAGS:
ID.AddInteger(cast<ARG_FLAGSSDNode>(N)->getArgFlags().getRawBits());
break;
case ISD::TargetConstant:
case ISD::Constant:
ID.Add(cast<ConstantSDNode>(N)->getAPIntValue());
break;
case ISD::TargetConstantFP:
case ISD::ConstantFP: {
ID.Add(cast<ConstantFPSDNode>(N)->getValueAPF());
break;
}
case ISD::TargetGlobalAddress:
case ISD::GlobalAddress:
case ISD::TargetGlobalTLSAddress:
case ISD::GlobalTLSAddress: {
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
ID.AddPointer(GA->getGlobal());
ID.AddInteger(GA->getOffset());
break;
}
case ISD::BasicBlock:
ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
break;
case ISD::Register:
ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
break;
case ISD::SRCVALUE:
ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
break;
case ISD::MEMOPERAND: {
const MachineMemOperand &MO = cast<MemOperandSDNode>(N)->MO;
ID.AddPointer(MO.getValue());
ID.AddInteger(MO.getFlags());
ID.AddInteger(MO.getOffset());
ID.AddInteger(MO.getSize());
ID.AddInteger(MO.getAlignment());
break;
}
case ISD::FrameIndex:
case ISD::TargetFrameIndex:
ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
break;
case ISD::JumpTable:
case ISD::TargetJumpTable:
ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
break;
case ISD::ConstantPool:
case ISD::TargetConstantPool: {
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
ID.AddInteger(CP->getAlignment());
ID.AddInteger(CP->getOffset());
if (CP->isMachineConstantPoolEntry())
CP->getMachineCPVal()->AddSelectionDAGCSEId(ID);
else
ID.AddPointer(CP->getConstVal());
break;
}
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(N);
ID.AddInteger(LD->getAddressingMode());
ID.AddInteger(LD->getExtensionType());
ID.AddInteger((unsigned int)(LD->getMemoryVT()));
ID.AddInteger(LD->getAlignment());
ID.AddInteger(LD->isVolatile());
break;
}
case ISD::STORE: {
StoreSDNode *ST = cast<StoreSDNode>(N);
ID.AddInteger(ST->getAddressingMode());
ID.AddInteger(ST->isTruncatingStore());
ID.AddInteger((unsigned int)(ST->getMemoryVT()));
ID.AddInteger(ST->getAlignment());
ID.AddInteger(ST->isVolatile());
break;
}
}
}
//===----------------------------------------------------------------------===//
// SelectionDAG Class
//===----------------------------------------------------------------------===//
/// RemoveDeadNodes - This method deletes all unreachable nodes in the
/// SelectionDAG.
void SelectionDAG::RemoveDeadNodes() {
// Create a dummy node (which is not added to allnodes), that adds a reference
// to the root node, preventing it from being deleted.
HandleSDNode Dummy(getRoot());
SmallVector<SDNode*, 128> DeadNodes;
// Add all obviously-dead nodes to the DeadNodes worklist.
for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
if (I->use_empty())
DeadNodes.push_back(I);
// Process the worklist, deleting the nodes and adding their uses to the
// worklist.
while (!DeadNodes.empty()) {
SDNode *N = DeadNodes.back();
DeadNodes.pop_back();
// Take the node out of the appropriate CSE map.
RemoveNodeFromCSEMaps(N);
// Next, brutally remove the operand list. This is safe to do, as there are
// no cycles in the graph.
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
SDNode *Operand = I->getVal();
Operand->removeUser(std::distance(N->op_begin(), I), N);
// Now that we removed this operand, see if there are no uses of it left.
if (Operand->use_empty())
DeadNodes.push_back(Operand);
}
if (N->OperandsNeedDelete) {
delete[] N->OperandList;
}
N->OperandList = 0;
N->NumOperands = 0;
// Finally, remove N itself.
AllNodes.erase(N);
}
// If the root changed (e.g. it was a dead load, update the root).
setRoot(Dummy.getValue());
}
void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
SmallVector<SDNode*, 16> DeadNodes;
DeadNodes.push_back(N);
// Process the worklist, deleting the nodes and adding their uses to the
// worklist.
while (!DeadNodes.empty()) {
SDNode *N = DeadNodes.back();
DeadNodes.pop_back();
if (UpdateListener)
UpdateListener->NodeDeleted(N);
// Take the node out of the appropriate CSE map.
RemoveNodeFromCSEMaps(N);
// Next, brutally remove the operand list. This is safe to do, as there are
// no cycles in the graph.
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
SDNode *Operand = I->getVal();
Operand->removeUser(std::distance(N->op_begin(), I), N);
// Now that we removed this operand, see if there are no uses of it left.
if (Operand->use_empty())
DeadNodes.push_back(Operand);
}
if (N->OperandsNeedDelete) {
delete[] N->OperandList;
}
N->OperandList = 0;
N->NumOperands = 0;
// Finally, remove N itself.
AllNodes.erase(N);
}
}
void SelectionDAG::DeleteNode(SDNode *N) {
assert(N->use_empty() && "Cannot delete a node that is not dead!");
// First take this out of the appropriate CSE map.
RemoveNodeFromCSEMaps(N);
// Finally, remove uses due to operands of this node, remove from the
// AllNodes list, and delete the node.
DeleteNodeNotInCSEMaps(N);
}
void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
// Remove it from the AllNodes list.
AllNodes.remove(N);
// Drop all of the operands and decrement used nodes use counts.
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
I->getVal()->removeUser(std::distance(N->op_begin(), I), N);
if (N->OperandsNeedDelete) {
delete[] N->OperandList;
}
N->OperandList = 0;
N->NumOperands = 0;
delete N;
}
/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
/// correspond to it. This is useful when we're about to delete or repurpose
/// the node. We don't want future request for structurally identical nodes
/// to return N anymore.
void SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
bool Erased = false;
switch (N->getOpcode()) {
case ISD::HANDLENODE: return; // noop.
case ISD::STRING:
Erased = StringNodes.erase(cast<StringSDNode>(N)->getValue());
break;
case ISD::CONDCODE:
assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
"Cond code doesn't exist!");
Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
break;
case ISD::ExternalSymbol:
Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
break;
case ISD::TargetExternalSymbol:
Erased =
TargetExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
break;
case ISD::VALUETYPE: {
MVT::ValueType VT = cast<VTSDNode>(N)->getVT();
if (MVT::isExtendedVT(VT)) {
Erased = ExtendedValueTypeNodes.erase(VT);
} else {
Erased = ValueTypeNodes[VT] != 0;
ValueTypeNodes[VT] = 0;
}
break;
}
default:
// Remove it from the CSE Map.
Erased = CSEMap.RemoveNode(N);
break;
}
#ifndef NDEBUG
// Verify that the node was actually in one of the CSE maps, unless it has a
// flag result (which cannot be CSE'd) or is one of the special cases that are
// not subject to CSE.
if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag &&
!N->isTargetOpcode()) {
N->dump(this);
cerr << "\n";
assert(0 && "Node is not in map!");
}
#endif
}
/// AddNonLeafNodeToCSEMaps - Add the specified node back to the CSE maps. It
/// has been taken out and modified in some way. If the specified node already
/// exists in the CSE maps, do not modify the maps, but return the existing node
/// instead. If it doesn't exist, add it and return null.
///
SDNode *SelectionDAG::AddNonLeafNodeToCSEMaps(SDNode *N) {
assert(N->getNumOperands() && "This is a leaf node!");
if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
return 0; // Never add these nodes.
// Check that remaining values produced are not flags.
for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
if (N->getValueType(i) == MVT::Flag)
return 0; // Never CSE anything that produces a flag.
SDNode *New = CSEMap.GetOrInsertNode(N);
if (New != N) return New; // Node already existed.
return 0;
}
/// FindModifiedNodeSlot - Find a slot for the specified node if its operands
/// were replaced with those specified. If this node is never memoized,
/// return null, otherwise return a pointer to the slot it would take. If a
/// node already exists with these operands, the slot will be non-null.
SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDOperand Op,
void *&InsertPos) {
if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
return 0; // Never add these nodes.
// Check that remaining values produced are not flags.
for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
if (N->getValueType(i) == MVT::Flag)
return 0; // Never CSE anything that produces a flag.
SDOperand Ops[] = { Op };
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
}
/// FindModifiedNodeSlot - Find a slot for the specified node if its operands
/// were replaced with those specified. If this node is never memoized,
/// return null, otherwise return a pointer to the slot it would take. If a
/// node already exists with these operands, the slot will be non-null.
SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
SDOperand Op1, SDOperand Op2,
void *&InsertPos) {
if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
return 0; // Never add these nodes.
// Check that remaining values produced are not flags.
for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
if (N->getValueType(i) == MVT::Flag)
return 0; // Never CSE anything that produces a flag.
SDOperand Ops[] = { Op1, Op2 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
}
/// FindModifiedNodeSlot - Find a slot for the specified node if its operands
/// were replaced with those specified. If this node is never memoized,
/// return null, otherwise return a pointer to the slot it would take. If a
/// node already exists with these operands, the slot will be non-null.
SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
SDOperandPtr Ops,unsigned NumOps,
void *&InsertPos) {
if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
return 0; // Never add these nodes.
// Check that remaining values produced are not flags.
for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
if (N->getValueType(i) == MVT::Flag)
return 0; // Never CSE anything that produces a flag.
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
ID.AddInteger(LD->getAddressingMode());
ID.AddInteger(LD->getExtensionType());
ID.AddInteger((unsigned int)(LD->getMemoryVT()));
ID.AddInteger(LD->getAlignment());
ID.AddInteger(LD->isVolatile());
} else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
ID.AddInteger(ST->getAddressingMode());
ID.AddInteger(ST->isTruncatingStore());
ID.AddInteger((unsigned int)(ST->getMemoryVT()));
ID.AddInteger(ST->getAlignment());
ID.AddInteger(ST->isVolatile());
}
return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
}
SelectionDAG::~SelectionDAG() {
while (!AllNodes.empty()) {
SDNode *N = AllNodes.begin();
N->SetNextInBucket(0);
if (N->OperandsNeedDelete) {
delete [] N->OperandList;
}
N->OperandList = 0;
N->NumOperands = 0;
AllNodes.pop_front();
}
}
SDOperand SelectionDAG::getZeroExtendInReg(SDOperand Op, MVT::ValueType VT) {
if (Op.getValueType() == VT) return Op;
APInt Imm = APInt::getLowBitsSet(Op.getValueSizeInBits(),
MVT::getSizeInBits(VT));
return getNode(ISD::AND, Op.getValueType(), Op,
getConstant(Imm, Op.getValueType()));
}
SDOperand SelectionDAG::getString(const std::string &Val) {
StringSDNode *&N = StringNodes[Val];
if (!N) {
N = new StringSDNode(Val);
AllNodes.push_back(N);
}
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getConstant(uint64_t Val, MVT::ValueType VT, bool isT) {
MVT::ValueType EltVT =
MVT::isVector(VT) ? MVT::getVectorElementType(VT) : VT;
return getConstant(APInt(MVT::getSizeInBits(EltVT), Val), VT, isT);
}
SDOperand SelectionDAG::getConstant(const APInt &Val, MVT::ValueType VT, bool isT) {
assert(MVT::isInteger(VT) && "Cannot create FP integer constant!");
MVT::ValueType EltVT =
MVT::isVector(VT) ? MVT::getVectorElementType(VT) : VT;
assert(Val.getBitWidth() == MVT::getSizeInBits(EltVT) &&
"APInt size does not match type size!");
unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(EltVT), (SDOperand*)0, 0);
ID.Add(Val);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
if (!MVT::isVector(VT))
return SDOperand(N, 0);
if (!N) {
N = new ConstantSDNode(isT, Val, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}
SDOperand Result(N, 0);
if (MVT::isVector(VT)) {
SmallVector<SDOperand, 8> Ops;
Ops.assign(MVT::getVectorNumElements(VT), Result);
Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
}
return Result;
}
SDOperand SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
return getConstant(Val, TLI.getPointerTy(), isTarget);
}
SDOperand SelectionDAG::getConstantFP(const APFloat& V, MVT::ValueType VT,
bool isTarget) {
assert(MVT::isFloatingPoint(VT) && "Cannot create integer FP constant!");
MVT::ValueType EltVT =
MVT::isVector(VT) ? MVT::getVectorElementType(VT) : VT;
// Do the map lookup using the actual bit pattern for the floating point
// value, so that we don't have problems with 0.0 comparing equal to -0.0, and
// we don't have issues with SNANs.
unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(EltVT), (SDOperand*)0, 0);
ID.Add(V);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
if (!MVT::isVector(VT))
return SDOperand(N, 0);
if (!N) {
N = new ConstantFPSDNode(isTarget, V, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}
SDOperand Result(N, 0);
if (MVT::isVector(VT)) {
SmallVector<SDOperand, 8> Ops;
Ops.assign(MVT::getVectorNumElements(VT), Result);
Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
}
return Result;
}
SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT,
bool isTarget) {
MVT::ValueType EltVT =
MVT::isVector(VT) ? MVT::getVectorElementType(VT) : VT;
if (EltVT==MVT::f32)
return getConstantFP(APFloat((float)Val), VT, isTarget);
else
return getConstantFP(APFloat(Val), VT, isTarget);
}
SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV,
MVT::ValueType VT, int Offset,
bool isTargetGA) {
unsigned Opc;
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (!GVar) {
// If GV is an alias then use the aliasee for determining thread-localness.
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal());
}
if (GVar && GVar->isThreadLocal())
Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
else
Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
ID.AddPointer(GV);
ID.AddInteger(Offset);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new GlobalAddressSDNode(isTargetGA, GV, VT, Offset);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getFrameIndex(int FI, MVT::ValueType VT,
bool isTarget) {
unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
ID.AddInteger(FI);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new FrameIndexSDNode(FI, VT, isTarget);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getJumpTable(int JTI, MVT::ValueType VT, bool isTarget){
unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
ID.AddInteger(JTI);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new JumpTableSDNode(JTI, VT, isTarget);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getConstantPool(Constant *C, MVT::ValueType VT,
unsigned Alignment, int Offset,
bool isTarget) {
unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
ID.AddInteger(Alignment);
ID.AddInteger(Offset);
ID.AddPointer(C);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getConstantPool(MachineConstantPoolValue *C,
MVT::ValueType VT,
unsigned Alignment, int Offset,
bool isTarget) {
unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
ID.AddInteger(Alignment);
ID.AddInteger(Offset);
C->AddSelectionDAGCSEId(ID);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), (SDOperand*)0, 0);
ID.AddPointer(MBB);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new BasicBlockSDNode(MBB);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getArgFlags(ISD::ArgFlagsTy Flags) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::ARG_FLAGS, getVTList(MVT::Other), (SDOperand*)0, 0);
ID.AddInteger(Flags.getRawBits());
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new ARG_FLAGSSDNode(Flags);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getValueType(MVT::ValueType VT) {
if (!MVT::isExtendedVT(VT) && (unsigned)VT >= ValueTypeNodes.size())
ValueTypeNodes.resize(VT+1);
SDNode *&N = MVT::isExtendedVT(VT) ?
ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT];
if (N) return SDOperand(N, 0);
N = new VTSDNode(VT);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT::ValueType VT) {
SDNode *&N = ExternalSymbols[Sym];
if (N) return SDOperand(N, 0);
N = new ExternalSymbolSDNode(false, Sym, VT);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getTargetExternalSymbol(const char *Sym,
MVT::ValueType VT) {
SDNode *&N = TargetExternalSymbols[Sym];
if (N) return SDOperand(N, 0);
N = new ExternalSymbolSDNode(true, Sym, VT);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getCondCode(ISD::CondCode Cond) {
if ((unsigned)Cond >= CondCodeNodes.size())
CondCodeNodes.resize(Cond+1);
if (CondCodeNodes[Cond] == 0) {
CondCodeNodes[Cond] = new CondCodeSDNode(Cond);
AllNodes.push_back(CondCodeNodes[Cond]);
}
return SDOperand(CondCodeNodes[Cond], 0);
}
SDOperand SelectionDAG::getRegister(unsigned RegNo, MVT::ValueType VT) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::Register, getVTList(VT), (SDOperand*)0, 0);
ID.AddInteger(RegNo);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new RegisterSDNode(RegNo, VT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getSrcValue(const Value *V) {
assert((!V || isa<PointerType>(V->getType())) &&
"SrcValue is not a pointer?");
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), (SDOperand*)0, 0);
ID.AddPointer(V);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new SrcValueSDNode(V);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getMemOperand(const MachineMemOperand &MO) {
const Value *v = MO.getValue();
assert((!v || isa<PointerType>(v->getType())) &&
"SrcValue is not a pointer?");
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::MEMOPERAND, getVTList(MVT::Other), (SDOperand*)0, 0);
ID.AddPointer(v);
ID.AddInteger(MO.getFlags());
ID.AddInteger(MO.getOffset());
ID.AddInteger(MO.getSize());
ID.AddInteger(MO.getAlignment());
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new MemOperandSDNode(MO);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
/// CreateStackTemporary - Create a stack temporary, suitable for holding the
/// specified value type.
SDOperand SelectionDAG::CreateStackTemporary(MVT::ValueType VT) {
MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
unsigned ByteSize = MVT::getSizeInBits(VT)/8;
const Type *Ty = MVT::getTypeForValueType(VT);
unsigned StackAlign = (unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty);
int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign);
return getFrameIndex(FrameIdx, TLI.getPointerTy());
}
SDOperand SelectionDAG::FoldSetCC(MVT::ValueType VT, SDOperand N1,
SDOperand N2, ISD::CondCode Cond) {
// These setcc operations always fold.
switch (Cond) {
default: break;
case ISD::SETFALSE:
case ISD::SETFALSE2: return getConstant(0, VT);
case ISD::SETTRUE:
case ISD::SETTRUE2: return getConstant(1, VT);
case ISD::SETOEQ:
case ISD::SETOGT:
case ISD::SETOGE:
case ISD::SETOLT:
case ISD::SETOLE:
case ISD::SETONE:
case ISD::SETO:
case ISD::SETUO:
case ISD::SETUEQ:
case ISD::SETUNE:
assert(!MVT::isInteger(N1.getValueType()) && "Illegal setcc for integer!");
break;
}
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) {
const APInt &C2 = N2C->getAPIntValue();
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) {
const APInt &C1 = N1C->getAPIntValue();
switch (Cond) {
default: assert(0 && "Unknown integer setcc!");
case ISD::SETEQ: return getConstant(C1 == C2, VT);
case ISD::SETNE: return getConstant(C1 != C2, VT);
case ISD::SETULT: return getConstant(C1.ult(C2), VT);
case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
case ISD::SETULE: return getConstant(C1.ule(C2), VT);
case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
case ISD::SETLT: return getConstant(C1.slt(C2), VT);
case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
case ISD::SETLE: return getConstant(C1.sle(C2), VT);
case ISD::SETGE: return getConstant(C1.sge(C2), VT);
}
}
}
if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) {
if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) {
// No compile time operations on this type yet.
if (N1C->getValueType(0) == MVT::ppcf128)
return SDOperand();
APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
switch (Cond) {
default: break;
case ISD::SETEQ: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
case ISD::SETNE: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
R==APFloat::cmpLessThan, VT);
case ISD::SETLT: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
case ISD::SETGT: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
case ISD::SETLE: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
R==APFloat::cmpEqual, VT);
case ISD::SETGE: if (R==APFloat::cmpUnordered)
return getNode(ISD::UNDEF, VT);
// fall through
case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
R==APFloat::cmpEqual, VT);
case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
R==APFloat::cmpEqual, VT);
case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
R==APFloat::cmpLessThan, VT);
case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
R==APFloat::cmpUnordered, VT);
case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
}
} else {
// Ensure that the constant occurs on the RHS.
return getSetCC(VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
}
}
// Could not fold it.
return SDOperand();
}
/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
/// use this predicate to simplify operations downstream.
bool SelectionDAG::SignBitIsZero(SDOperand Op, unsigned Depth) const {
unsigned BitWidth = Op.getValueSizeInBits();
return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
}
/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
/// this predicate to simplify operations downstream. Mask is known to be zero
/// for bits that V cannot have.
bool SelectionDAG::MaskedValueIsZero(SDOperand Op, const APInt &Mask,
unsigned Depth) const {
APInt KnownZero, KnownOne;
ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
return (KnownZero & Mask) == Mask;
}
/// ComputeMaskedBits - Determine which of the bits specified in Mask are
/// known to be either zero or one and return them in the KnownZero/KnownOne
/// bitsets. This code only analyzes bits in Mask, in order to short-circuit
/// processing.
void SelectionDAG::ComputeMaskedBits(SDOperand Op, const APInt &Mask,
APInt &KnownZero, APInt &KnownOne,
unsigned Depth) const {
unsigned BitWidth = Mask.getBitWidth();
assert(BitWidth == MVT::getSizeInBits(Op.getValueType()) &&
"Mask size mismatches value type size!");
KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
if (Depth == 6 || Mask == 0)
return; // Limit search depth.
APInt KnownZero2, KnownOne2;
switch (Op.getOpcode()) {
case ISD::Constant:
// We know all of the bits for a constant!
KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask;
KnownZero = ~KnownOne & Mask;
return;
case ISD::AND:
// If either the LHS or the RHS are Zero, the result is zero.
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero,
KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// Output known-1 bits are only known if set in both the LHS & RHS.
KnownOne &= KnownOne2;
// Output known-0 are known to be clear if zero in either the LHS | RHS.
KnownZero |= KnownZero2;
return;
case ISD::OR:
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne,
KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// Output known-0 bits are only known if clear in both the LHS & RHS.
KnownZero &= KnownZero2;
// Output known-1 are known to be set if set in either the LHS | RHS.
KnownOne |= KnownOne2;
return;
case ISD::XOR: {
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// Output known-0 bits are known if clear or set in both the LHS & RHS.
APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
// Output known-1 are known to be set if set in only one of the LHS, RHS.
KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
KnownZero = KnownZeroOut;
return;
}
case ISD::MUL: {
APInt Mask2 = APInt::getAllOnesValue(BitWidth);
ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// If low bits are zero in either operand, output low known-0 bits.
// Also compute a conserative estimate for high known-0 bits.
// More trickiness is possible, but this is sufficient for the
// interesting case of alignment computation.
KnownOne.clear();
unsigned TrailZ = KnownZero.countTrailingOnes() +
KnownZero2.countTrailingOnes();
unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
KnownZero2.countLeadingOnes(),
BitWidth) - BitWidth;
TrailZ = std::min(TrailZ, BitWidth);
LeadZ = std::min(LeadZ, BitWidth);
KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
APInt::getHighBitsSet(BitWidth, LeadZ);
KnownZero &= Mask;
return;
}
case ISD::UDIV: {
// For the purposes of computing leading zeros we can conservatively
// treat a udiv as a logical right shift by the power of 2 known to
// be less than the denominator.
APInt AllOnes = APInt::getAllOnesValue(BitWidth);
ComputeMaskedBits(Op.getOperand(0),
AllOnes, KnownZero2, KnownOne2, Depth+1);
unsigned LeadZ = KnownZero2.countLeadingOnes();
KnownOne2.clear();
KnownZero2.clear();
ComputeMaskedBits(Op.getOperand(1),
AllOnes, KnownZero2, KnownOne2, Depth+1);
unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
if (RHSUnknownLeadingOnes != BitWidth)
LeadZ = std::min(BitWidth,
LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask;
return;
}
case ISD::SELECT:
ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// Only known if known in both the LHS and RHS.
KnownOne &= KnownOne2;
KnownZero &= KnownZero2;
return;
case ISD::SELECT_CC:
ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1);
ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
// Only known if known in both the LHS and RHS.
KnownOne &= KnownOne2;
KnownZero &= KnownZero2;
return;
case ISD::SETCC:
// If we know the result of a setcc has the top bits zero, use this info.
if (TLI.getSetCCResultContents() == TargetLowering::ZeroOrOneSetCCResult &&
BitWidth > 1)
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
return;
case ISD::SHL:
// (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned ShAmt = SA->getValue();
// If the shift count is an invalid immediate, don't do anything.
if (ShAmt >= BitWidth)
return;
ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt),
KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
KnownZero <<= ShAmt;
KnownOne <<= ShAmt;
// low bits known zero.
KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
}
return;
case ISD::SRL:
// (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned ShAmt = SA->getValue();
// If the shift count is an invalid immediate, don't do anything.
if (ShAmt >= BitWidth)
return;
ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt),
KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
KnownZero = KnownZero.lshr(ShAmt);
KnownOne = KnownOne.lshr(ShAmt);
APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
KnownZero |= HighBits; // High bits known zero.
}
return;
case ISD::SRA:
if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned ShAmt = SA->getValue();
// If the shift count is an invalid immediate, don't do anything.
if (ShAmt >= BitWidth)
return;
APInt InDemandedMask = (Mask << ShAmt);
// If any of the demanded bits are produced by the sign extension, we also
// demand the input sign bit.
APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
if (HighBits.getBoolValue())
InDemandedMask |= APInt::getSignBit(BitWidth);
ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne,
Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
KnownZero = KnownZero.lshr(ShAmt);
KnownOne = KnownOne.lshr(ShAmt);
// Handle the sign bits.
APInt SignBit = APInt::getSignBit(BitWidth);
SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
if (KnownZero.intersects(SignBit)) {
KnownZero |= HighBits; // New bits are known zero.
} else if (KnownOne.intersects(SignBit)) {
KnownOne |= HighBits; // New bits are known one.
}
}
return;
case ISD::SIGN_EXTEND_INREG: {
MVT::ValueType EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
unsigned EBits = MVT::getSizeInBits(EVT);
// Sign extension. Compute the demanded bits in the result that are not
// present in the input.
APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask;
APInt InSignBit = APInt::getSignBit(EBits);
APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits);
// If the sign extended bits are demanded, we know that the sign
// bit is demanded.
InSignBit.zext(BitWidth);
if (NewBits.getBoolValue())
InputDemandedBits |= InSignBit;
ComputeMaskedBits(Op.getOperand(0), InputDemandedBits,
KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
// If the sign bit of the input is known set or clear, then we know the
// top bits of the result.
if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
KnownZero |= NewBits;
KnownOne &= ~NewBits;
} else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
KnownOne |= NewBits;
KnownZero &= ~NewBits;
} else { // Input sign bit unknown
KnownZero &= ~NewBits;
KnownOne &= ~NewBits;
}
return;
}
case ISD::CTTZ:
case ISD::CTLZ:
case ISD::CTPOP: {
unsigned LowBits = Log2_32(BitWidth)+1;
KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
KnownOne = APInt(BitWidth, 0);
return;
}
case ISD::LOAD: {
if (ISD::isZEXTLoad(Op.Val)) {
LoadSDNode *LD = cast<LoadSDNode>(Op);
MVT::ValueType VT = LD->getMemoryVT();
unsigned MemBits = MVT::getSizeInBits(VT);
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
}
return;
}
case ISD::ZERO_EXTEND: {
MVT::ValueType InVT = Op.getOperand(0).getValueType();
unsigned InBits = MVT::getSizeInBits(InVT);
APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
APInt InMask = Mask;
InMask.trunc(InBits);
KnownZero.trunc(InBits);
KnownOne.trunc(InBits);
ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
KnownZero.zext(BitWidth);
KnownOne.zext(BitWidth);
KnownZero |= NewBits;
return;
}
case ISD::SIGN_EXTEND: {
MVT::ValueType InVT = Op.getOperand(0).getValueType();
unsigned InBits = MVT::getSizeInBits(InVT);
APInt InSignBit = APInt::getSignBit(InBits);
APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
APInt InMask = Mask;
InMask.trunc(InBits);
// If any of the sign extended bits are demanded, we know that the sign
// bit is demanded. Temporarily set this bit in the mask for our callee.
if (NewBits.getBoolValue())
InMask |= InSignBit;
KnownZero.trunc(InBits);
KnownOne.trunc(InBits);
ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
// Note if the sign bit is known to be zero or one.
bool SignBitKnownZero = KnownZero.isNegative();
bool SignBitKnownOne = KnownOne.isNegative();
assert(!(SignBitKnownZero && SignBitKnownOne) &&
"Sign bit can't be known to be both zero and one!");
// If the sign bit wasn't actually demanded by our caller, we don't
// want it set in the KnownZero and KnownOne result values. Reset the
// mask and reapply it to the result values.
InMask = Mask;
InMask.trunc(InBits);
KnownZero &= InMask;
KnownOne &= InMask;
KnownZero.zext(BitWidth);
KnownOne.zext(BitWidth);
// If the sign bit is known zero or one, the top bits match.
if (SignBitKnownZero)
KnownZero |= NewBits;
else if (SignBitKnownOne)
KnownOne |= NewBits;
return;
}
case ISD::ANY_EXTEND: {
MVT::ValueType InVT = Op.getOperand(0).getValueType();
unsigned InBits = MVT::getSizeInBits(InVT);
APInt InMask = Mask;
InMask.trunc(InBits);
KnownZero.trunc(InBits);
KnownOne.trunc(InBits);
ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
KnownZero.zext(BitWidth);
KnownOne.zext(BitWidth);
return;
}
case ISD::TRUNCATE: {
MVT::ValueType InVT = Op.getOperand(0).getValueType();
unsigned InBits = MVT::getSizeInBits(InVT);
APInt InMask = Mask;
InMask.zext(InBits);
KnownZero.zext(InBits);
KnownOne.zext(InBits);
ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
KnownZero.trunc(BitWidth);
KnownOne.trunc(BitWidth);
break;
}
case ISD::AssertZext: {
MVT::ValueType VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
APInt InMask = APInt::getLowBitsSet(BitWidth, MVT::getSizeInBits(VT));
ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero,
KnownOne, Depth+1);
KnownZero |= (~InMask) & Mask;
return;
}
case ISD::FGETSIGN:
// All bits are zero except the low bit.
KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
return;
case ISD::SUB: {
if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
// We know that the top bits of C-X are clear if X contains less bits
// than C (i.e. no wrap-around can happen). For example, 20-X is
// positive if we can prove that X is >= 0 and < 16.
if (CLHS->getAPIntValue().isNonNegative()) {
unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
// NLZ can't be BitWidth with no sign bit
APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2,
Depth+1);
// If all of the MaskV bits are known to be zero, then we know the
// output top bits are zero, because we now know that the output is
// from [0-C].
if ((KnownZero2 & MaskV) == MaskV) {
unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
// Top bits known zero.
KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask;
}
}
}
}
// fall through
case ISD::ADD: {
// Output known-0 bits are known if clear or set in both the low clear bits
// common to both LHS & RHS. For example, 8+(X<<3) is known to have the
// low 3 bits clear.
APInt Mask2 = APInt::getLowBitsSet(BitWidth, Mask.countTrailingOnes());
ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1);
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
KnownZeroOut = std::min(KnownZeroOut,
KnownZero2.countTrailingOnes());
KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
return;
}
case ISD::SREM:
if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
APInt RA = Rem->getAPIntValue();
if (RA.isPowerOf2() || (-RA).isPowerOf2()) {
APInt LowBits = RA.isStrictlyPositive() ? (RA - 1) : ~RA;
APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1);
// The sign of a remainder is equal to the sign of the first
// operand (zero being positive).
if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
KnownZero2 |= ~LowBits;
else if (KnownOne2[BitWidth-1])
KnownOne2 |= ~LowBits;
KnownZero |= KnownZero2 & Mask;
KnownOne |= KnownOne2 & Mask;
assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
}
}
return;
case ISD::UREM: {
if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
APInt RA = Rem->getAPIntValue();
if (RA.isPowerOf2()) {
APInt LowBits = (RA - 1);
APInt Mask2 = LowBits & Mask;
KnownZero |= ~LowBits & Mask;
ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1);
assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
break;
}
}
// Since the result is less than or equal to either operand, any leading
// zero bits in either operand must also exist in the result.
APInt AllOnes = APInt::getAllOnesValue(BitWidth);
ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne,
Depth+1);
ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2,
Depth+1);
uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
KnownZero2.countLeadingOnes());
KnownOne.clear();
KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask;
return;
}
default:
// Allow the target to implement this method for its nodes.
if (Op.getOpcode() >= ISD::BUILTIN_OP_END) {
case ISD::INTRINSIC_WO_CHAIN:
case ISD::INTRINSIC_W_CHAIN:
case ISD::INTRINSIC_VOID:
TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this);
}
return;
}
}
/// ComputeNumSignBits - Return the number of times the sign bit of the
/// register is replicated into the other bits. We know that at least 1 bit
/// is always equal to the sign bit (itself), but other cases can give us
/// information. For example, immediately after an "SRA X, 2", we know that
/// the top 3 bits are all equal to each other, so we return 3.
unsigned SelectionDAG::ComputeNumSignBits(SDOperand Op, unsigned Depth) const{
MVT::ValueType VT = Op.getValueType();
assert(MVT::isInteger(VT) && "Invalid VT!");
unsigned VTBits = MVT::getSizeInBits(VT);
unsigned Tmp, Tmp2;
if (Depth == 6)
return 1; // Limit search depth.
switch (Op.getOpcode()) {
default: break;
case ISD::AssertSext:
Tmp = MVT::getSizeInBits(cast<VTSDNode>(Op.getOperand(1))->getVT());
return VTBits-Tmp+1;
case ISD::AssertZext:
Tmp = MVT::getSizeInBits(cast<VTSDNode>(Op.getOperand(1))->getVT());
return VTBits-Tmp;
case ISD::Constant: {
const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
// If negative, return # leading ones.
if (Val.isNegative())
return Val.countLeadingOnes();
// Return # leading zeros.
return Val.countLeadingZeros();
}
case ISD::SIGN_EXTEND:
Tmp = VTBits-MVT::getSizeInBits(Op.getOperand(0).getValueType());
return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
case ISD::SIGN_EXTEND_INREG:
// Max of the input and what this extends.
Tmp = MVT::getSizeInBits(cast<VTSDNode>(Op.getOperand(1))->getVT());
Tmp = VTBits-Tmp+1;
Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
return std::max(Tmp, Tmp2);
case ISD::SRA:
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
// SRA X, C -> adds C sign bits.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Tmp += C->getValue();
if (Tmp > VTBits) Tmp = VTBits;
}
return Tmp;
case ISD::SHL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
// shl destroys sign bits.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (C->getValue() >= VTBits || // Bad shift.
C->getValue() >= Tmp) break; // Shifted all sign bits out.
return Tmp - C->getValue();
}
break;
case ISD::AND:
case ISD::OR:
case ISD::XOR: // NOT is handled here.
// Logical binary ops preserve the number of sign bits.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp == 1) return 1; // Early out.
Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
return std::min(Tmp, Tmp2);
case ISD::SELECT:
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp == 1) return 1; // Early out.
Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
return std::min(Tmp, Tmp2);
case ISD::SETCC:
// If setcc returns 0/-1, all bits are sign bits.
if (TLI.getSetCCResultContents() ==
TargetLowering::ZeroOrNegativeOneSetCCResult)
return VTBits;
break;
case ISD::ROTL:
case ISD::ROTR:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned RotAmt = C->getValue() & (VTBits-1);
// Handle rotate right by N like a rotate left by 32-N.
if (Op.getOpcode() == ISD::ROTR)
RotAmt = (VTBits-RotAmt) & (VTBits-1);
// If we aren't rotating out all of the known-in sign bits, return the
// number that are left. This handles rotl(sext(x), 1) for example.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp > RotAmt+1) return Tmp-RotAmt;
}
break;
case ISD::ADD:
// Add can have at most one carry bit. Thus we know that the output
// is, at worst, one more bit than the inputs.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp == 1) return 1; // Early out.
// Special case decrementing a value (ADD X, -1):
if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
if (CRHS->isAllOnesValue()) {
APInt KnownZero, KnownOne;
APInt Mask = APInt::getAllOnesValue(VTBits);
ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
// If the input is known to be 0 or 1, the output is 0/-1, which is all
// sign bits set.
if ((KnownZero | APInt(VTBits, 1)) == Mask)
return VTBits;
// If we are subtracting one from a positive number, there is no carry
// out of the result.
if (KnownZero.isNegative())
return Tmp;
}
Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
if (Tmp2 == 1) return 1;
return std::min(Tmp, Tmp2)-1;
break;
case ISD::SUB:
Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
if (Tmp2 == 1) return 1;
// Handle NEG.
if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
if (CLHS->isNullValue()) {
APInt KnownZero, KnownOne;
APInt Mask = APInt::getAllOnesValue(VTBits);
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
// If the input is known to be 0 or 1, the output is 0/-1, which is all
// sign bits set.
if ((KnownZero | APInt(VTBits, 1)) == Mask)
return VTBits;
// If the input is known to be positive (the sign bit is known clear),
// the output of the NEG has the same number of sign bits as the input.
if (KnownZero.isNegative())
return Tmp2;
// Otherwise, we treat this like a SUB.
}
// Sub can have at most one carry bit. Thus we know that the output
// is, at worst, one more bit than the inputs.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp == 1) return 1; // Early out.
return std::min(Tmp, Tmp2)-1;
break;
case ISD::TRUNCATE:
// FIXME: it's tricky to do anything useful for this, but it is an important
// case for targets like X86.
break;
}
// Handle LOADX separately here. EXTLOAD case will fallthrough.
if (Op.getOpcode() == ISD::LOAD) {
LoadSDNode *LD = cast<LoadSDNode>(Op);
unsigned ExtType = LD->getExtensionType();
switch (ExtType) {
default: break;
case ISD::SEXTLOAD: // '17' bits known
Tmp = MVT::getSizeInBits(LD->getMemoryVT());
return VTBits-Tmp+1;
case ISD::ZEXTLOAD: // '16' bits known
Tmp = MVT::getSizeInBits(LD->getMemoryVT());
return VTBits-Tmp;
}
}
// Allow the target to implement this method for its nodes.
if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
Op.getOpcode() == ISD::INTRINSIC_VOID) {
unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
if (NumBits > 1) return NumBits;
}
// Finally, if we can prove that the top bits of the result are 0's or 1's,
// use this information.
APInt KnownZero, KnownOne;
APInt Mask = APInt::getAllOnesValue(VTBits);
ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
if (KnownZero.isNegative()) { // sign bit is 0
Mask = KnownZero;
} else if (KnownOne.isNegative()) { // sign bit is 1;
Mask = KnownOne;
} else {
// Nothing known.
return 1;
}
// Okay, we know that the sign bit in Mask is set. Use CLZ to determine
// the number of identical bits in the top of the input value.
Mask = ~Mask;
Mask <<= Mask.getBitWidth()-VTBits;
// Return # leading zeros. We use 'min' here in case Val was zero before
// shifting. We don't want to return '64' as for an i32 "0".
return std::min(VTBits, Mask.countLeadingZeros());
}
bool SelectionDAG::isVerifiedDebugInfoDesc(SDOperand Op) const {
GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
if (!GA) return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
if (!GV) return false;
MachineModuleInfo *MMI = getMachineModuleInfo();
return MMI && MMI->hasDebugInfo() && MMI->isVerified(GV);
}
/// getNode - Gets or creates the specified node.
///
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, getVTList(VT), (SDOperand*)0, 0);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new SDNode(Opcode, SDNode::getSDVTList(VT));
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Operand) {
// Constant fold unary operations with an integer constant operand.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) {
const APInt &Val = C->getAPIntValue();
unsigned BitWidth = MVT::getSizeInBits(VT);
switch (Opcode) {
default: break;
case ISD::SIGN_EXTEND:
return getConstant(APInt(Val).sextOrTrunc(BitWidth), VT);
case ISD::ANY_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::TRUNCATE:
return getConstant(APInt(Val).zextOrTrunc(BitWidth), VT);
case ISD::UINT_TO_FP:
case ISD::SINT_TO_FP: {
const uint64_t zero[] = {0, 0};
// No compile time operations on this type.
if (VT==MVT::ppcf128)
break;
APFloat apf = APFloat(APInt(BitWidth, 2, zero));
(void)apf.convertFromAPInt(Val,
Opcode==ISD::SINT_TO_FP,
APFloat::rmNearestTiesToEven);
return getConstantFP(apf, VT);
}
case ISD::BIT_CONVERT:
if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
return getConstantFP(Val.bitsToFloat(), VT);
else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
return getConstantFP(Val.bitsToDouble(), VT);
break;
case ISD::BSWAP:
return getConstant(Val.byteSwap(), VT);
case ISD::CTPOP:
return getConstant(Val.countPopulation(), VT);
case ISD::CTLZ:
return getConstant(Val.countLeadingZeros(), VT);
case ISD::CTTZ:
return getConstant(Val.countTrailingZeros(), VT);
}
}
// Constant fold unary operations with a floating point constant operand.
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) {
APFloat V = C->getValueAPF(); // make copy
if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
switch (Opcode) {
case ISD::FNEG:
V.changeSign();
return getConstantFP(V, VT);
case ISD::FABS:
V.clearSign();
return getConstantFP(V, VT);
case ISD::FP_ROUND:
case ISD::FP_EXTEND:
// This can return overflow, underflow, or inexact; we don't care.
// FIXME need to be more flexible about rounding mode.
(void)V.convert(*MVTToAPFloatSemantics(VT),
APFloat::rmNearestTiesToEven);
return getConstantFP(V, VT);
case ISD::FP_TO_SINT:
case ISD::FP_TO_UINT: {
integerPart x;
assert(integerPartWidth >= 64);
// FIXME need to be more flexible about rounding mode.
APFloat::opStatus s = V.convertToInteger(&x, 64U,
Opcode==ISD::FP_TO_SINT,
APFloat::rmTowardZero);
if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
break;
return getConstant(x, VT);
}
case ISD::BIT_CONVERT:
if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
return getConstant((uint32_t)V.convertToAPInt().getZExtValue(), VT);
else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
return getConstant(V.convertToAPInt().getZExtValue(), VT);
break;
}
}
}
unsigned OpOpcode = Operand.Val->getOpcode();
switch (Opcode) {
case ISD::TokenFactor:
case ISD::MERGE_VALUES:
return Operand; // Factor or merge of one node? No need.
case ISD::FP_ROUND: assert(0 && "Invalid method to make FP_ROUND node");
case ISD::FP_EXTEND:
assert(MVT::isFloatingPoint(VT) &&
MVT::isFloatingPoint(Operand.getValueType()) && "Invalid FP cast!");
if (Operand.getValueType() == VT) return Operand; // noop conversion.
if (Operand.getOpcode() == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
break;
case ISD::SIGN_EXTEND:
assert(MVT::isInteger(VT) && MVT::isInteger(Operand.getValueType()) &&
"Invalid SIGN_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(MVT::getSizeInBits(Operand.getValueType()) < MVT::getSizeInBits(VT)
&& "Invalid sext node, dst < src!");
if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
break;
case ISD::ZERO_EXTEND:
assert(MVT::isInteger(VT) && MVT::isInteger(Operand.getValueType()) &&
"Invalid ZERO_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(MVT::getSizeInBits(Operand.getValueType()) < MVT::getSizeInBits(VT)
&& "Invalid zext node, dst < src!");
if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0));
break;
case ISD::ANY_EXTEND:
assert(MVT::isInteger(VT) && MVT::isInteger(Operand.getValueType()) &&
"Invalid ANY_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(MVT::getSizeInBits(Operand.getValueType()) < MVT::getSizeInBits(VT)
&& "Invalid anyext node, dst < src!");
if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND)
// (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
break;
case ISD::TRUNCATE:
assert(MVT::isInteger(VT) && MVT::isInteger(Operand.getValueType()) &&
"Invalid TRUNCATE!");
if (Operand.getValueType() == VT) return Operand; // noop truncate
assert(MVT::getSizeInBits(Operand.getValueType()) > MVT::getSizeInBits(VT)
&& "Invalid truncate node, src < dst!");
if (OpOpcode == ISD::TRUNCATE)
return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0));
else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
OpOpcode == ISD::ANY_EXTEND) {
// If the source is smaller than the dest, we still need an extend.
if (MVT::getSizeInBits(Operand.Val->getOperand(0).getValueType())
< MVT::getSizeInBits(VT))
return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
else if (MVT::getSizeInBits(Operand.Val->getOperand(0).getValueType())
> MVT::getSizeInBits(VT))
return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0));
else
return Operand.Val->getOperand(0);
}
break;
case ISD::BIT_CONVERT:
// Basic sanity checking.
assert(MVT::getSizeInBits(VT) == MVT::getSizeInBits(Operand.getValueType())
&& "Cannot BIT_CONVERT between types of different sizes!");
if (VT == Operand.getValueType()) return Operand; // noop conversion.
if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
if (OpOpcode == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
break;
case ISD::SCALAR_TO_VECTOR:
assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) &&
MVT::getVectorElementType(VT) == Operand.getValueType() &&
"Illegal SCALAR_TO_VECTOR node!");
if (OpOpcode == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
// scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
isa<ConstantSDNode>(Operand.getOperand(1)) &&
Operand.getConstantOperandVal(1) == 0 &&
Operand.getOperand(0).getValueType() == VT)
return Operand.getOperand(0);
break;
case ISD::FNEG:
if (OpOpcode == ISD::FSUB) // -(X-Y) -> (Y-X)
return getNode(ISD::FSUB, VT, Operand.Val->getOperand(1),
Operand.Val->getOperand(0));
if (OpOpcode == ISD::FNEG) // --X -> X
return Operand.Val->getOperand(0);
break;
case ISD::FABS:
if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
return getNode(ISD::FABS, VT, Operand.Val->getOperand(0));
break;
}
SDNode *N;
SDVTList VTs = getVTList(VT);
if (VT != MVT::Flag) { // Don't CSE flag producing nodes
FoldingSetNodeID ID;
SDOperand Ops[1] = { Operand };
AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
N = new UnarySDNode(Opcode, VTs, Operand);
CSEMap.InsertNode(N, IP);
} else {
N = new UnarySDNode(Opcode, VTs, Operand);
}
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2) {
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val);
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val);
switch (Opcode) {
default: break;
case ISD::TokenFactor:
assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
N2.getValueType() == MVT::Other && "Invalid token factor!");
// Fold trivial token factors.
if (N1.getOpcode() == ISD::EntryToken) return N2;
if (N2.getOpcode() == ISD::EntryToken) return N1;
break;
case ISD::AND:
assert(MVT::isInteger(VT) && N1.getValueType() == N2.getValueType() &&
N1.getValueType() == VT && "Binary operator types must match!");
// (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
// worth handling here.
if (N2C && N2C->isNullValue())
return N2;
if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
return N1;
break;
case ISD::OR:
case ISD::XOR:
assert(MVT::isInteger(VT) && N1.getValueType() == N2.getValueType() &&
N1.getValueType() == VT && "Binary operator types must match!");
// (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's
// worth handling here.
if (N2C && N2C->isNullValue())
return N1;
break;
case ISD::UDIV:
case ISD::UREM:
case ISD::MULHU:
case ISD::MULHS:
assert(MVT::isInteger(VT) && "This operator does not apply to FP types!");
// fall through
case ISD::ADD:
case ISD::SUB:
case ISD::MUL:
case ISD::SDIV:
case ISD::SREM:
case ISD::FADD:
case ISD::FSUB:
case ISD::FMUL:
case ISD::FDIV:
case ISD::FREM:
assert(N1.getValueType() == N2.getValueType() &&
N1.getValueType() == VT && "Binary operator types must match!");
break;
case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
assert(N1.getValueType() == VT &&
MVT::isFloatingPoint(N1.getValueType()) &&
MVT::isFloatingPoint(N2.getValueType()) &&
"Invalid FCOPYSIGN!");
break;
case ISD::SHL:
case ISD::SRA:
case ISD::SRL:
case ISD::ROTL:
case ISD::ROTR:
assert(VT == N1.getValueType() &&
"Shift operators return type must be the same as their first arg");
assert(MVT::isInteger(VT) && MVT::isInteger(N2.getValueType()) &&
VT != MVT::i1 && "Shifts only work on integers");
break;
case ISD::FP_ROUND_INREG: {
MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg round!");
assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) &&
"Cannot FP_ROUND_INREG integer types");
assert(MVT::getSizeInBits(EVT) <= MVT::getSizeInBits(VT) &&
"Not rounding down!");
if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
break;
}
case ISD::FP_ROUND:
assert(MVT::isFloatingPoint(VT) &&
MVT::isFloatingPoint(N1.getValueType()) &&
MVT::getSizeInBits(VT) <= MVT::getSizeInBits(N1.getValueType()) &&
isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
if (N1.getValueType() == VT) return N1; // noop conversion.
break;
case ISD::AssertSext:
case ISD::AssertZext: {
MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg extend!");
assert(MVT::isInteger(VT) && MVT::isInteger(EVT) &&
"Cannot *_EXTEND_INREG FP types");
assert(MVT::getSizeInBits(EVT) <= MVT::getSizeInBits(VT) &&
"Not extending!");
if (VT == EVT) return N1; // noop assertion.
break;
}
case ISD::SIGN_EXTEND_INREG: {
MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg extend!");
assert(MVT::isInteger(VT) && MVT::isInteger(EVT) &&
"Cannot *_EXTEND_INREG FP types");
assert(MVT::getSizeInBits(EVT) <= MVT::getSizeInBits(VT) &&
"Not extending!");
if (EVT == VT) return N1; // Not actually extending
if (N1C) {
APInt Val = N1C->getAPIntValue();
unsigned FromBits = MVT::getSizeInBits(cast<VTSDNode>(N2)->getVT());
Val <<= Val.getBitWidth()-FromBits;
Val = Val.ashr(Val.getBitWidth()-FromBits);
return getConstant(Val, VT);
}
break;
}
case ISD::EXTRACT_VECTOR_ELT:
assert(N2C && "Bad EXTRACT_VECTOR_ELT!");
// EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
if (N1.getOpcode() == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
// EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
// expanding copies of large vectors from registers.
if (N1.getOpcode() == ISD::CONCAT_VECTORS &&
N1.getNumOperands() > 0) {
unsigned Factor =
MVT::getVectorNumElements(N1.getOperand(0).getValueType());
return getNode(ISD::EXTRACT_VECTOR_ELT, VT,
N1.getOperand(N2C->getValue() / Factor),
getConstant(N2C->getValue() % Factor, N2.getValueType()));
}
// EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
// expanding large vector constants.
if (N1.getOpcode() == ISD::BUILD_VECTOR)
return N1.getOperand(N2C->getValue());
// EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
// operations are lowered to scalars.
if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT)
if (ConstantSDNode *IEC = dyn_cast<ConstantSDNode>(N1.getOperand(2))) {
if (IEC == N2C)
return N1.getOperand(1);
else
return getNode(ISD::EXTRACT_VECTOR_ELT, VT, N1.getOperand(0), N2);
}
break;
case ISD::EXTRACT_ELEMENT:
assert(N2C && (unsigned)N2C->getValue() < 2 && "Bad EXTRACT_ELEMENT!");
assert(!MVT::isVector(N1.getValueType()) &&
MVT::isInteger(N1.getValueType()) &&
!MVT::isVector(VT) && MVT::isInteger(VT) &&
"EXTRACT_ELEMENT only applies to integers!");
// EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
// 64-bit integers into 32-bit parts. Instead of building the extract of
// the BUILD_PAIR, only to have legalize rip it apart, just do it now.
if (N1.getOpcode() == ISD::BUILD_PAIR)
return N1.getOperand(N2C->getValue());
// EXTRACT_ELEMENT of a constant int is also very common.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
unsigned ElementSize = MVT::getSizeInBits(VT);
unsigned Shift = ElementSize * N2C->getValue();
APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
return getConstant(ShiftedVal.trunc(ElementSize), VT);
}
break;
case ISD::EXTRACT_SUBVECTOR:
if (N1.getValueType() == VT) // Trivial extraction.
return N1;
break;
}
if (N1C) {
if (N2C) {
APInt C1 = N1C->getAPIntValue(), C2 = N2C->getAPIntValue();
switch (Opcode) {
case ISD::ADD: return getConstant(C1 + C2, VT);
case ISD::SUB: return getConstant(C1 - C2, VT);
case ISD::MUL: return getConstant(C1 * C2, VT);
case ISD::UDIV:
if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
break;
case ISD::UREM :
if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
break;
case ISD::SDIV :
if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
break;
case ISD::SREM :
if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
break;
case ISD::AND : return getConstant(C1 & C2, VT);
case ISD::OR : return getConstant(C1 | C2, VT);
case ISD::XOR : return getConstant(C1 ^ C2, VT);
case ISD::SHL : return getConstant(C1 << C2, VT);
case ISD::SRL : return getConstant(C1.lshr(C2), VT);
case ISD::SRA : return getConstant(C1.ashr(C2), VT);
case ISD::ROTL : return getConstant(C1.rotl(C2), VT);
case ISD::ROTR : return getConstant(C1.rotr(C2), VT);
default: break;
}
} else { // Cannonicalize constant to RHS if commutative
if (isCommutativeBinOp(Opcode)) {
std::swap(N1C, N2C);
std::swap(N1, N2);
}
}
}
// Constant fold FP operations.
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val);
ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val);
if (N1CFP) {
if (!N2CFP && isCommutativeBinOp(Opcode)) {
// Cannonicalize constant to RHS if commutative
std::swap(N1CFP, N2CFP);
std::swap(N1, N2);
} else if (N2CFP && VT != MVT::ppcf128) {
APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
APFloat::opStatus s;
switch (Opcode) {
case ISD::FADD:
s = V1.add(V2, APFloat::rmNearestTiesToEven);
if (s != APFloat::opInvalidOp)
return getConstantFP(V1, VT);
break;
case ISD::FSUB:
s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
if (s!=APFloat::opInvalidOp)
return getConstantFP(V1, VT);
break;
case ISD::FMUL:
s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
if (s!=APFloat::opInvalidOp)
return getConstantFP(V1, VT);
break;
case ISD::FDIV:
s = V1.divide(V2, APFloat::rmNearestTiesToEven);
if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
return getConstantFP(V1, VT);
break;
case ISD::FREM :
s = V1.mod(V2, APFloat::rmNearestTiesToEven);
if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
return getConstantFP(V1, VT);
break;
case ISD::FCOPYSIGN:
V1.copySign(V2);
return getConstantFP(V1, VT);
default: break;
}
}
}
// Canonicalize an UNDEF to the RHS, even over a constant.
if (N1.getOpcode() == ISD::UNDEF) {
if (isCommutativeBinOp(Opcode)) {
std::swap(N1, N2);
} else {
switch (Opcode) {
case ISD::FP_ROUND_INREG:
case ISD::SIGN_EXTEND_INREG:
case ISD::SUB:
case ISD::FSUB:
case ISD::FDIV:
case ISD::FREM:
case ISD::SRA:
return N1; // fold op(undef, arg2) -> undef
case ISD::UDIV:
case ISD::SDIV:
case ISD::UREM:
case ISD::SREM:
case ISD::SRL:
case ISD::SHL:
if (!MVT::isVector(VT))
return getConstant(0, VT); // fold op(undef, arg2) -> 0
// For vectors, we can't easily build an all zero vector, just return
// the LHS.
return N2;
}
}
}
// Fold a bunch of operators when the RHS is undef.
if (N2.getOpcode() == ISD::UNDEF) {
switch (Opcode) {
case ISD::XOR:
if (N1.getOpcode() == ISD::UNDEF)
// Handle undef ^ undef -> 0 special case. This is a common
// idiom (misuse).
return getConstant(0, VT);
// fallthrough
case ISD::ADD:
case ISD::ADDC:
case ISD::ADDE:
case ISD::SUB:
case ISD::FADD:
case ISD::FSUB:
case ISD::FMUL:
case ISD::FDIV:
case ISD::FREM:
case ISD::UDIV:
case ISD::SDIV:
case ISD::UREM:
case ISD::SREM:
return N2; // fold op(arg1, undef) -> undef
case ISD::MUL:
case ISD::AND:
case ISD::SRL:
case ISD::SHL:
if (!MVT::isVector(VT))
return getConstant(0, VT); // fold op(arg1, undef) -> 0
// For vectors, we can't easily build an all zero vector, just return
// the LHS.
return N1;
case ISD::OR:
if (!MVT::isVector(VT))
return getConstant(MVT::getIntVTBitMask(VT), VT);
// For vectors, we can't easily build an all one vector, just return
// the LHS.
return N1;
case ISD::SRA:
return N1;
}
}
// Memoize this node if possible.
SDNode *N;
SDVTList VTs = getVTList(VT);
if (VT != MVT::Flag) {
SDOperand Ops[] = { N1, N2 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
N = new BinarySDNode(Opcode, VTs, N1, N2);
CSEMap.InsertNode(N, IP);
} else {
N = new BinarySDNode(Opcode, VTs, N1, N2);
}
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3) {
// Perform various simplifications.
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val);
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val);
switch (Opcode) {
case ISD::SETCC: {
// Use FoldSetCC to simplify SETCC's.
SDOperand Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get());
if (Simp.Val) return Simp;
break;
}
case ISD::SELECT:
if (N1C) {
if (N1C->getValue())
return N2; // select true, X, Y -> X
else
return N3; // select false, X, Y -> Y
}
if (N2 == N3) return N2; // select C, X, X -> X
break;
case ISD::BRCOND:
if (N2C) {
if (N2C->getValue()) // Unconditional branch
return getNode(ISD::BR, MVT::Other, N1, N3);
else
return N1; // Never-taken branch
}
break;
case ISD::VECTOR_SHUFFLE:
assert(VT == N1.getValueType() && VT == N2.getValueType() &&
MVT::isVector(VT) && MVT::isVector(N3.getValueType()) &&
N3.getOpcode() == ISD::BUILD_VECTOR &&
MVT::getVectorNumElements(VT) == N3.getNumOperands() &&
"Illegal VECTOR_SHUFFLE node!");
break;
case ISD::BIT_CONVERT:
// Fold bit_convert nodes from a type to themselves.
if (N1.getValueType() == VT)
return N1;
break;
}
// Memoize node if it doesn't produce a flag.
SDNode *N;
SDVTList VTs = getVTList(VT);
if (VT != MVT::Flag) {
SDOperand Ops[] = { N1, N2, N3 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
N = new TernarySDNode(Opcode, VTs, N1, N2, N3);
CSEMap.InsertNode(N, IP);
} else {
N = new TernarySDNode(Opcode, VTs, N1, N2, N3);
}
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3,
SDOperand N4) {
SDOperand Ops[] = { N1, N2, N3, N4 };
return getNode(Opcode, VT, Ops, 4);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3,
SDOperand N4, SDOperand N5) {
SDOperand Ops[] = { N1, N2, N3, N4, N5 };
return getNode(Opcode, VT, Ops, 5);
}
/// getMemsetValue - Vectorized representation of the memset value
/// operand.
static SDOperand getMemsetValue(SDOperand Value, MVT::ValueType VT,
SelectionDAG &DAG) {
MVT::ValueType CurVT = VT;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
uint64_t Val = C->getValue() & 255;
unsigned Shift = 8;
while (CurVT != MVT::i8) {
Val = (Val << Shift) | Val;
Shift <<= 1;
CurVT = (MVT::ValueType)((unsigned)CurVT - 1);
}
return DAG.getConstant(Val, VT);
} else {
Value = DAG.getNode(ISD::ZERO_EXTEND, VT, Value);
unsigned Shift = 8;
while (CurVT != MVT::i8) {
Value =
DAG.getNode(ISD::OR, VT,
DAG.getNode(ISD::SHL, VT, Value,
DAG.getConstant(Shift, MVT::i8)), Value);
Shift <<= 1;
CurVT = (MVT::ValueType)((unsigned)CurVT - 1);
}
return Value;
}
}
/// getMemsetStringVal - Similar to getMemsetValue. Except this is only
/// used when a memcpy is turned into a memset when the source is a constant
/// string ptr.
static SDOperand getMemsetStringVal(MVT::ValueType VT,
SelectionDAG &DAG,
const TargetLowering &TLI,
std::string &Str, unsigned Offset) {
uint64_t Val = 0;
unsigned MSB = MVT::getSizeInBits(VT) / 8;
if (TLI.isLittleEndian())
Offset = Offset + MSB - 1;
for (unsigned i = 0; i != MSB; ++i) {
Val = (Val << 8) | (unsigned char)Str[Offset];
Offset += TLI.isLittleEndian() ? -1 : 1;
}
return DAG.getConstant(Val, VT);
}
/// getMemBasePlusOffset - Returns base and offset node for the
static SDOperand getMemBasePlusOffset(SDOperand Base, unsigned Offset,
SelectionDAG &DAG) {
MVT::ValueType VT = Base.getValueType();
return DAG.getNode(ISD::ADD, VT, Base, DAG.getConstant(Offset, VT));
}
/// MeetsMaxMemopRequirement - Determines if the number of memory ops required
/// to replace the memset / memcpy is below the threshold. It also returns the
/// types of the sequence of memory ops to perform memset / memcpy.
static bool MeetsMaxMemopRequirement(std::vector<MVT::ValueType> &MemOps,
unsigned Limit, uint64_t Size,
unsigned Align,
const TargetLowering &TLI) {
MVT::ValueType VT;
if (TLI.allowsUnalignedMemoryAccesses()) {
VT = MVT::i64;
} else {
switch (Align & 7) {
case 0:
VT = MVT::i64;
break;
case 4:
VT = MVT::i32;
break;
case 2:
VT = MVT::i16;
break;
default:
VT = MVT::i8;
break;
}
}
MVT::ValueType LVT = MVT::i64;
while (!TLI.isTypeLegal(LVT))
LVT = (MVT::ValueType)((unsigned)LVT - 1);
assert(MVT::isInteger(LVT));
if (VT > LVT)
VT = LVT;
unsigned NumMemOps = 0;
while (Size != 0) {
unsigned VTSize = MVT::getSizeInBits(VT) / 8;
while (VTSize > Size) {
VT = (MVT::ValueType)((unsigned)VT - 1);
VTSize >>= 1;
}
assert(MVT::isInteger(VT));
if (++NumMemOps > Limit)
return false;
MemOps.push_back(VT);
Size -= VTSize;
}
return true;
}
static SDOperand getMemcpyLoadsAndStores(SelectionDAG &DAG,
SDOperand Chain, SDOperand Dst,
SDOperand Src, uint64_t Size,
unsigned Align,
bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff){
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
// Expand memcpy to a series of store ops if the size operand falls below
// a certain threshold.
std::vector<MVT::ValueType> MemOps;
uint64_t Limit = -1;
if (!AlwaysInline)
Limit = TLI.getMaxStoresPerMemcpy();
if (!MeetsMaxMemopRequirement(MemOps, Limit, Size, Align, TLI))
return SDOperand();
SmallVector<SDOperand, 8> OutChains;
unsigned NumMemOps = MemOps.size();
unsigned SrcDelta = 0;
GlobalAddressSDNode *G = NULL;
std::string Str;
bool CopyFromStr = false;
uint64_t SrcOff = 0, DstOff = 0;
if (Src.getOpcode() == ISD::GlobalAddress)
G = cast<GlobalAddressSDNode>(Src);
else if (Src.getOpcode() == ISD::ADD &&
Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
Src.getOperand(1).getOpcode() == ISD::Constant) {
G = cast<GlobalAddressSDNode>(Src.getOperand(0));
SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getValue();
}
if (G) {
GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
if (GV && GV->isConstant()) {
Str = GV->getStringValue(false);
if (!Str.empty()) {
CopyFromStr = true;
SrcOff += SrcDelta;
}
}
}
for (unsigned i = 0; i < NumMemOps; i++) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = MVT::getSizeInBits(VT) / 8;
SDOperand Value, Store;
if (CopyFromStr) {
Value = getMemsetStringVal(VT, DAG, TLI, Str, SrcOff);
Store =
DAG.getStore(Chain, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff);
} else {
Value = DAG.getLoad(VT, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, false, Align);
Store =
DAG.getStore(Chain, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, Align);
}
OutChains.push_back(Store);
SrcOff += VTSize;
DstOff += VTSize;
}
return DAG.getNode(ISD::TokenFactor, MVT::Other,
&OutChains[0], OutChains.size());
}
static SDOperand getMemsetStores(SelectionDAG &DAG,
SDOperand Chain, SDOperand Dst,
SDOperand Src, uint64_t Size,
unsigned Align,
const Value *DstSV, uint64_t DstSVOff) {
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
// Expand memset to a series of load/store ops if the size operand
// falls below a certain threshold.
std::vector<MVT::ValueType> MemOps;
if (!MeetsMaxMemopRequirement(MemOps, TLI.getMaxStoresPerMemset(),
Size, Align, TLI))
return SDOperand();
SmallVector<SDOperand, 8> OutChains;
uint64_t DstOff = 0;
unsigned NumMemOps = MemOps.size();
for (unsigned i = 0; i < NumMemOps; i++) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = MVT::getSizeInBits(VT) / 8;
SDOperand Value = getMemsetValue(Src, VT, DAG);
SDOperand Store = DAG.getStore(Chain, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff);
OutChains.push_back(Store);
DstOff += VTSize;
}
return DAG.getNode(ISD::TokenFactor, MVT::Other,
&OutChains[0], OutChains.size());
}
SDOperand SelectionDAG::getMemcpy(SDOperand Chain, SDOperand Dst,
SDOperand Src, SDOperand Size,
unsigned Align, bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff) {
// Check to see if we should lower the memcpy to loads and stores first.
// For cases within the target-specified limits, this is the best choice.
ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
if (ConstantSize) {
// Memcpy with size zero? Just return the original chain.
if (ConstantSize->isNullValue())
return Chain;
SDOperand Result =
getMemcpyLoadsAndStores(*this, Chain, Dst, Src, ConstantSize->getValue(),
Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.Val)
return Result;
}
// Then check to see if we should lower the memcpy with target-specific
// code. If the target chooses to do this, this is the next best.
SDOperand Result =
TLI.EmitTargetCodeForMemcpy(*this, Chain, Dst, Src, Size, Align,
AlwaysInline,
DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.Val)
return Result;
// If we really need inline code and the target declined to provide it,
// use a (potentially long) sequence of loads and stores.
if (AlwaysInline) {
assert(ConstantSize && "AlwaysInline requires a constant size!");
return getMemcpyLoadsAndStores(*this, Chain, Dst, Src,
ConstantSize->getValue(), Align, true,
DstSV, DstSVOff, SrcSV, SrcSVOff);
}
// Emit a library call.
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = TLI.getTargetData()->getIntPtrType();
Entry.Node = Dst; Args.push_back(Entry);
Entry.Node = Src; Args.push_back(Entry);
Entry.Node = Size; Args.push_back(Entry);
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, CallingConv::C, false,
getExternalSymbol("memcpy", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDOperand SelectionDAG::getMemmove(SDOperand Chain, SDOperand Dst,
SDOperand Src, SDOperand Size,
unsigned Align,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff) {
// TODO: Optimize small memmove cases with simple loads and stores,
// ensuring that all loads precede all stores. This can cause severe
// register pressure, so targets should be careful with the size limit.
// Then check to see if we should lower the memmove with target-specific
// code. If the target chooses to do this, this is the next best.
SDOperand Result =
TLI.EmitTargetCodeForMemmove(*this, Chain, Dst, Src, Size, Align,
DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.Val)
return Result;
// Emit a library call.
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = TLI.getTargetData()->getIntPtrType();
Entry.Node = Dst; Args.push_back(Entry);
Entry.Node = Src; Args.push_back(Entry);
Entry.Node = Size; Args.push_back(Entry);
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, CallingConv::C, false,
getExternalSymbol("memmove", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDOperand SelectionDAG::getMemset(SDOperand Chain, SDOperand Dst,
SDOperand Src, SDOperand Size,
unsigned Align,
const Value *DstSV, uint64_t DstSVOff) {
// Check to see if we should lower the memset to stores first.
// For cases within the target-specified limits, this is the best choice.
ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
if (ConstantSize) {
// Memset with size zero? Just return the original chain.
if (ConstantSize->isNullValue())
return Chain;
SDOperand Result =
getMemsetStores(*this, Chain, Dst, Src, ConstantSize->getValue(), Align,
DstSV, DstSVOff);
if (Result.Val)
return Result;
}
// Then check to see if we should lower the memset with target-specific
// code. If the target chooses to do this, this is the next best.
SDOperand Result =
TLI.EmitTargetCodeForMemset(*this, Chain, Dst, Src, Size, Align,
DstSV, DstSVOff);
if (Result.Val)
return Result;
// Emit a library call.
const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType();
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Node = Dst; Entry.Ty = IntPtrTy;
Args.push_back(Entry);
// Extend or truncate the argument to be an i32 value for the call.
if (Src.getValueType() > MVT::i32)
Src = getNode(ISD::TRUNCATE, MVT::i32, Src);
else
Src = getNode(ISD::ZERO_EXTEND, MVT::i32, Src);
Entry.Node = Src; Entry.Ty = Type::Int32Ty; Entry.isSExt = true;
Args.push_back(Entry);
Entry.Node = Size; Entry.Ty = IntPtrTy; Entry.isSExt = false;
Args.push_back(Entry);
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, CallingConv::C, false,
getExternalSymbol("memset", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDOperand SelectionDAG::getAtomic(unsigned Opcode, SDOperand Chain,
SDOperand Ptr, SDOperand Cmp,
SDOperand Swp, MVT::ValueType VT) {
assert(Opcode == ISD::ATOMIC_LCS && "Invalid Atomic Op");
assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
SDVTList VTs = getVTList(Cmp.getValueType(), MVT::Other);
FoldingSetNodeID ID;
SDOperand Ops[] = {Chain, Ptr, Cmp, Swp};
AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
ID.AddInteger((unsigned int)VT);
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode* N = new AtomicSDNode(Opcode, VTs, Chain, Ptr, Cmp, Swp, VT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getAtomic(unsigned Opcode, SDOperand Chain,
SDOperand Ptr, SDOperand Val,
MVT::ValueType VT) {
assert(( Opcode == ISD::ATOMIC_LAS || Opcode == ISD::ATOMIC_LSS
|| Opcode == ISD::ATOMIC_SWAP || Opcode == ISD::ATOMIC_LOAD_AND
|| Opcode == ISD::ATOMIC_LOAD_OR || Opcode == ISD::ATOMIC_LOAD_XOR
|| Opcode == ISD::ATOMIC_LOAD_MIN || Opcode == ISD::ATOMIC_LOAD_MAX
|| Opcode == ISD::ATOMIC_LOAD_UMIN || Opcode == ISD::ATOMIC_LOAD_UMAX)
&& "Invalid Atomic Op");
SDVTList VTs = getVTList(Val.getValueType(), MVT::Other);
FoldingSetNodeID ID;
SDOperand Ops[] = {Chain, Ptr, Val};
AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
ID.AddInteger((unsigned int)VT);
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode* N = new AtomicSDNode(Opcode, VTs, Chain, Ptr, Val, VT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand
SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
MVT::ValueType VT, SDOperand Chain,
SDOperand Ptr, SDOperand Offset,
const Value *SV, int SVOffset, MVT::ValueType EVT,
bool isVolatile, unsigned Alignment) {
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for load must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for load");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
if (VT == EVT) {
ExtType = ISD::NON_EXTLOAD;
} else if (ExtType == ISD::NON_EXTLOAD) {
assert(VT == EVT && "Non-extending load from different memory type!");
} else {
// Extending load.
if (MVT::isVector(VT))
assert(EVT == MVT::getVectorElementType(VT) && "Invalid vector extload!");
else
assert(MVT::getSizeInBits(EVT) < MVT::getSizeInBits(VT) &&
"Should only be an extending load, not truncating!");
assert((ExtType == ISD::EXTLOAD || MVT::isInteger(VT)) &&
"Cannot sign/zero extend a FP/Vector load!");
assert(MVT::isInteger(VT) == MVT::isInteger(EVT) &&
"Cannot convert from FP to Int or Int -> FP!");
}
bool Indexed = AM != ISD::UNINDEXED;
assert(Indexed || Offset.getOpcode() == ISD::UNDEF &&
"Unindexed load with an offset!");
SDVTList VTs = Indexed ?
getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
SDOperand Ops[] = { Chain, Ptr, Offset };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
ID.AddInteger(AM);
ID.AddInteger(ExtType);
ID.AddInteger((unsigned int)EVT);
ID.AddInteger(Alignment);
ID.AddInteger(isVolatile);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new LoadSDNode(Ops, VTs, AM, ExtType, EVT, SV, SVOffset,
Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getLoad(MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr,
const Value *SV, int SVOffset,
bool isVolatile, unsigned Alignment) {
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef,
SV, SVOffset, VT, isVolatile, Alignment);
}
SDOperand SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr,
const Value *SV,
int SVOffset, MVT::ValueType EVT,
bool isVolatile, unsigned Alignment) {
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
return getLoad(ISD::UNINDEXED, ExtType, VT, Chain, Ptr, Undef,
SV, SVOffset, EVT, isVolatile, Alignment);
}
SDOperand
SelectionDAG::getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM) {
LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
"Load is already a indexed load!");
return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(),
LD->getChain(), Base, Offset, LD->getSrcValue(),
LD->getSrcValueOffset(), LD->getMemoryVT(),
LD->isVolatile(), LD->getAlignment());
}
SDOperand SelectionDAG::getStore(SDOperand Chain, SDOperand Val,
SDOperand Ptr, const Value *SV, int SVOffset,
bool isVolatile, unsigned Alignment) {
MVT::ValueType VT = Val.getValueType();
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for store must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for store");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDVTList VTs = getVTList(MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Val, Ptr, Undef };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
ID.AddInteger(ISD::UNINDEXED);
ID.AddInteger(false);
ID.AddInteger((unsigned int)VT);
ID.AddInteger(Alignment);
ID.AddInteger(isVolatile);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, false,
VT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getTruncStore(SDOperand Chain, SDOperand Val,
SDOperand Ptr, const Value *SV,
int SVOffset, MVT::ValueType SVT,
bool isVolatile, unsigned Alignment) {
MVT::ValueType VT = Val.getValueType();
if (VT == SVT)
return getStore(Chain, Val, Ptr, SV, SVOffset, isVolatile, Alignment);
assert(MVT::getSizeInBits(VT) > MVT::getSizeInBits(SVT) &&
"Not a truncation?");
assert(MVT::isInteger(VT) == MVT::isInteger(SVT) &&
"Can't do FP-INT conversion!");
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for store must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for store");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDVTList VTs = getVTList(MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Val, Ptr, Undef };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
ID.AddInteger(ISD::UNINDEXED);
ID.AddInteger(1);
ID.AddInteger((unsigned int)SVT);
ID.AddInteger(Alignment);
ID.AddInteger(isVolatile);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, true,
SVT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand
SelectionDAG::getIndexedStore(SDOperand OrigStore, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM) {
StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
"Store is already a indexed store!");
SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
SDOperand Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
ID.AddInteger(AM);
ID.AddInteger(ST->isTruncatingStore());
ID.AddInteger((unsigned int)(ST->getMemoryVT()));
ID.AddInteger(ST->getAlignment());
ID.AddInteger(ST->isVolatile());
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
SDNode *N = new StoreSDNode(Ops, VTs, AM,
ST->isTruncatingStore(), ST->getMemoryVT(),
ST->getSrcValue(), ST->getSrcValueOffset(),
ST->getAlignment(), ST->isVolatile());
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getVAArg(MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr,
SDOperand SV) {
SDOperand Ops[] = { Chain, Ptr, SV };
return getNode(ISD::VAARG, getVTList(VT, MVT::Other), Ops, 3);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperandPtr Ops, unsigned NumOps) {
switch (NumOps) {
case 0: return getNode(Opcode, VT);
case 1: return getNode(Opcode, VT, Ops[0]);
case 2: return getNode(Opcode, VT, Ops[0], Ops[1]);
case 3: return getNode(Opcode, VT, Ops[0], Ops[1], Ops[2]);
default: break;
}
switch (Opcode) {
default: break;
case ISD::SELECT_CC: {
assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
assert(Ops[0].getValueType() == Ops[1].getValueType() &&
"LHS and RHS of condition must have same type!");
assert(Ops[2].getValueType() == Ops[3].getValueType() &&
"True and False arms of SelectCC must have same type!");
assert(Ops[2].getValueType() == VT &&
"select_cc node must be of same type as true and false value!");
break;
}
case ISD::BR_CC: {
assert(NumOps == 5 && "BR_CC takes 5 operands!");
assert(Ops[2].getValueType() == Ops[3].getValueType() &&
"LHS/RHS of comparison should match types!");
break;
}
}
// Memoize nodes.
SDNode *N;
SDVTList VTs = getVTList(VT);
if (VT != MVT::Flag) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
N = new SDNode(Opcode, VTs, Ops, NumOps);
CSEMap.InsertNode(N, IP);
} else {
N = new SDNode(Opcode, VTs, Ops, NumOps);
}
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode,
std::vector<MVT::ValueType> &ResultTys,
SDOperandPtr Ops, unsigned NumOps) {
return getNode(Opcode, getNodeValueTypes(ResultTys), ResultTys.size(),
Ops, NumOps);
}
SDOperand SelectionDAG::getNode(unsigned Opcode,
const MVT::ValueType *VTs, unsigned NumVTs,
SDOperandPtr Ops, unsigned NumOps) {
if (NumVTs == 1)
return getNode(Opcode, VTs[0], Ops, NumOps);
return getNode(Opcode, makeVTList(VTs, NumVTs), Ops, NumOps);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperandPtr Ops, unsigned NumOps) {
if (VTList.NumVTs == 1)
return getNode(Opcode, VTList.VTs[0], Ops, NumOps);
switch (Opcode) {
// FIXME: figure out how to safely handle things like
// int foo(int x) { return 1 << (x & 255); }
// int bar() { return foo(256); }
#if 0
case ISD::SRA_PARTS:
case ISD::SRL_PARTS:
case ISD::SHL_PARTS:
if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
return getNode(Opcode, VT, N1, N2, N3.getOperand(0));
else if (N3.getOpcode() == ISD::AND)
if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
// If the and is only masking out bits that cannot effect the shift,
// eliminate the and.
unsigned NumBits = MVT::getSizeInBits(VT)*2;
if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
return getNode(Opcode, VT, N1, N2, N3.getOperand(0));
}
break;
#endif
}
// Memoize the node unless it returns a flag.
SDNode *N;
if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
if (NumOps == 1)
N = new UnarySDNode(Opcode, VTList, Ops[0]);
else if (NumOps == 2)
N = new BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
else if (NumOps == 3)
N = new TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
else
N = new SDNode(Opcode, VTList, Ops, NumOps);
CSEMap.InsertNode(N, IP);
} else {
if (NumOps == 1)
N = new UnarySDNode(Opcode, VTList, Ops[0]);
else if (NumOps == 2)
N = new BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
else if (NumOps == 3)
N = new TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
else
N = new SDNode(Opcode, VTList, Ops, NumOps);
}
AllNodes.push_back(N);
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList) {
return getNode(Opcode, VTList, (SDOperand*)0, 0);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperand N1) {
SDOperand Ops[] = { N1 };
return getNode(Opcode, VTList, Ops, 1);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperand N1, SDOperand N2) {
SDOperand Ops[] = { N1, N2 };
return getNode(Opcode, VTList, Ops, 2);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperand N1, SDOperand N2, SDOperand N3) {
SDOperand Ops[] = { N1, N2, N3 };
return getNode(Opcode, VTList, Ops, 3);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperand N1, SDOperand N2, SDOperand N3,
SDOperand N4) {
SDOperand Ops[] = { N1, N2, N3, N4 };
return getNode(Opcode, VTList, Ops, 4);
}
SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDOperand N1, SDOperand N2, SDOperand N3,
SDOperand N4, SDOperand N5) {
SDOperand Ops[] = { N1, N2, N3, N4, N5 };
return getNode(Opcode, VTList, Ops, 5);
}
SDVTList SelectionDAG::getVTList(MVT::ValueType VT) {
return makeVTList(SDNode::getValueTypeList(VT), 1);
}
SDVTList SelectionDAG::getVTList(MVT::ValueType VT1, MVT::ValueType VT2) {
for (std::list<std::vector<MVT::ValueType> >::iterator I = VTList.begin(),
E = VTList.end(); I != E; ++I) {
if (I->size() == 2 && (*I)[0] == VT1 && (*I)[1] == VT2)
return makeVTList(&(*I)[0], 2);
}
std::vector<MVT::ValueType> V;
V.push_back(VT1);
V.push_back(VT2);
VTList.push_front(V);
return makeVTList(&(*VTList.begin())[0], 2);
}
SDVTList SelectionDAG::getVTList(MVT::ValueType VT1, MVT::ValueType VT2,
MVT::ValueType VT3) {
for (std::list<std::vector<MVT::ValueType> >::iterator I = VTList.begin(),
E = VTList.end(); I != E; ++I) {
if (I->size() == 3 && (*I)[0] == VT1 && (*I)[1] == VT2 &&
(*I)[2] == VT3)
return makeVTList(&(*I)[0], 3);
}
std::vector<MVT::ValueType> V;
V.push_back(VT1);
V.push_back(VT2);
V.push_back(VT3);
VTList.push_front(V);
return makeVTList(&(*VTList.begin())[0], 3);
}
SDVTList SelectionDAG::getVTList(const MVT::ValueType *VTs, unsigned NumVTs) {
switch (NumVTs) {
case 0: assert(0 && "Cannot have nodes without results!");
case 1: return getVTList(VTs[0]);
case 2: return getVTList(VTs[0], VTs[1]);
case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
default: break;
}
for (std::list<std::vector<MVT::ValueType> >::iterator I = VTList.begin(),
E = VTList.end(); I != E; ++I) {
if (I->size() != NumVTs || VTs[0] != (*I)[0] || VTs[1] != (*I)[1]) continue;
bool NoMatch = false;
for (unsigned i = 2; i != NumVTs; ++i)
if (VTs[i] != (*I)[i]) {
NoMatch = true;
break;
}
if (!NoMatch)
return makeVTList(&*I->begin(), NumVTs);
}
VTList.push_front(std::vector<MVT::ValueType>(VTs, VTs+NumVTs));
return makeVTList(&*VTList.begin()->begin(), NumVTs);
}
/// UpdateNodeOperands - *Mutate* the specified node in-place to have the
/// specified operands. If the resultant node already exists in the DAG,
/// this does not modify the specified node, instead it returns the node that
/// already exists. If the resultant node does not exist in the DAG, the
/// input node is returned. As a degenerate case, if you specify the same
/// input operands as the node already has, the input node is returned.
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand InN, SDOperand Op) {
SDNode *N = InN.Val;
assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
// Check to see if there is no change.
if (Op == N->getOperand(0)) return InN;
// See if the modified node already exists.
void *InsertPos = 0;
if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
return SDOperand(Existing, InN.ResNo);
// Nope it doesn't. Remove the node from it's current place in the maps.
if (InsertPos)
RemoveNodeFromCSEMaps(N);
// Now we update the operands.
N->OperandList[0].getVal()->removeUser(0, N);
N->OperandList[0] = Op;
N->OperandList[0].setUser(N);
Op.Val->addUser(0, N);
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand InN, SDOperand Op1, SDOperand Op2) {
SDNode *N = InN.Val;
assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
// Check to see if there is no change.
if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
return InN; // No operands changed, just return the input node.
// See if the modified node already exists.
void *InsertPos = 0;
if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
return SDOperand(Existing, InN.ResNo);
// Nope it doesn't. Remove the node from it's current place in the maps.
if (InsertPos)
RemoveNodeFromCSEMaps(N);
// Now we update the operands.
if (N->OperandList[0] != Op1) {
N->OperandList[0].getVal()->removeUser(0, N);
N->OperandList[0] = Op1;
N->OperandList[0].setUser(N);
Op1.Val->addUser(0, N);
}
if (N->OperandList[1] != Op2) {
N->OperandList[1].getVal()->removeUser(1, N);
N->OperandList[1] = Op2;
N->OperandList[1].setUser(N);
Op2.Val->addUser(1, N);
}
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2, SDOperand Op3) {
SDOperand Ops[] = { Op1, Op2, Op3 };
return UpdateNodeOperands(N, Ops, 3);
}
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
SDOperand Op3, SDOperand Op4) {
SDOperand Ops[] = { Op1, Op2, Op3, Op4 };
return UpdateNodeOperands(N, Ops, 4);
}
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
SDOperand Op3, SDOperand Op4, SDOperand Op5) {
SDOperand Ops[] = { Op1, Op2, Op3, Op4, Op5 };
return UpdateNodeOperands(N, Ops, 5);
}
SDOperand SelectionDAG::
UpdateNodeOperands(SDOperand InN, SDOperandPtr Ops, unsigned NumOps) {
SDNode *N = InN.Val;
assert(N->getNumOperands() == NumOps &&
"Update with wrong number of operands");
// Check to see if there is no change.
bool AnyChange = false;
for (unsigned i = 0; i != NumOps; ++i) {
if (Ops[i] != N->getOperand(i)) {
AnyChange = true;
break;
}
}
// No operands changed, just return the input node.
if (!AnyChange) return InN;
// See if the modified node already exists.
void *InsertPos = 0;
if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
return SDOperand(Existing, InN.ResNo);
// Nope it doesn't. Remove the node from its current place in the maps.
if (InsertPos)
RemoveNodeFromCSEMaps(N);
// Now we update the operands.
for (unsigned i = 0; i != NumOps; ++i) {
if (N->OperandList[i] != Ops[i]) {
N->OperandList[i].getVal()->removeUser(i, N);
N->OperandList[i] = Ops[i];
N->OperandList[i].setUser(N);
Ops[i].Val->addUser(i, N);
}
}
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
/// MorphNodeTo - This frees the operands of the current node, resets the
/// opcode, types, and operands to the specified value. This should only be
/// used by the SelectionDAG class.
void SDNode::MorphNodeTo(unsigned Opc, SDVTList L,
SDOperandPtr Ops, unsigned NumOps) {
NodeType = Opc;
ValueList = L.VTs;
NumValues = L.NumVTs;
// Clear the operands list, updating used nodes to remove this from their
// use list.
for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
I->getVal()->removeUser(std::distance(op_begin(), I), this);
// If NumOps is larger than the # of operands we currently have, reallocate
// the operand list.
if (NumOps > NumOperands) {
if (OperandsNeedDelete) {
delete [] OperandList;
}
OperandList = new SDUse[NumOps];
OperandsNeedDelete = true;
}
// Assign the new operands.
NumOperands = NumOps;
for (unsigned i = 0, e = NumOps; i != e; ++i) {
OperandList[i] = Ops[i];
OperandList[i].setUser(this);
SDNode *N = OperandList[i].getVal();
N->addUser(i, this);
++N->UsesSize;
}
}
/// SelectNodeTo - These are used for target selectors to *mutate* the
/// specified node to have the specified return type, Target opcode, and
/// operands. Note that target opcodes are stored as
/// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field.
///
/// Note that SelectNodeTo returns the resultant node. If there is already a
/// node of the specified opcode and operands, it returns that node instead of
/// the current one.
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT) {
SDVTList VTs = getVTList(VT);
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, (SDOperand*)0, 0);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, SDOperandPtr(), 0);
CSEMap.InsertNode(N, IP);
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT, SDOperand Op1) {
// If an identical node already exists, use it.
SDVTList VTs = getVTList(VT);
SDOperand Ops[] = { Op1 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 1);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 1);
CSEMap.InsertNode(N, IP);
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT, SDOperand Op1,
SDOperand Op2) {
// If an identical node already exists, use it.
SDVTList VTs = getVTList(VT);
SDOperand Ops[] = { Op1, Op2 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
CSEMap.InsertNode(N, IP); // Memoize the new node.
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT, SDOperand Op1,
SDOperand Op2, SDOperand Op3) {
// If an identical node already exists, use it.
SDVTList VTs = getVTList(VT);
SDOperand Ops[] = { Op1, Op2, Op3 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
CSEMap.InsertNode(N, IP); // Memoize the new node.
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT, SDOperandPtr Ops,
unsigned NumOps) {
// If an identical node already exists, use it.
SDVTList VTs = getVTList(VT);
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, NumOps);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, NumOps);
CSEMap.InsertNode(N, IP); // Memoize the new node.
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT1, MVT::ValueType VT2,
SDOperand Op1, SDOperand Op2) {
SDVTList VTs = getVTList(VT1, VT2);
FoldingSetNodeID ID;
SDOperand Ops[] = { Op1, Op2 };
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
CSEMap.InsertNode(N, IP); // Memoize the new node.
return N;
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
MVT::ValueType VT1, MVT::ValueType VT2,
SDOperand Op1, SDOperand Op2,
SDOperand Op3) {
// If an identical node already exists, use it.
SDVTList VTs = getVTList(VT1, VT2);
SDOperand Ops[] = { Op1, Op2, Op3 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
void *IP = 0;
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
RemoveNodeFromCSEMaps(N);
N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
CSEMap.InsertNode(N, IP); // Memoize the new node.
return N;
}
/// getTargetNode - These are used for target selectors to create a new node
/// with specified return type(s), target opcode, and operands.
///
/// Note that getTargetNode returns the resultant node. If there is already a
/// node of the specified opcode and operands, it returns that node instead of
/// the current one.
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT) {
return getNode(ISD::BUILTIN_OP_END+Opcode, VT).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1) {
return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2) {
return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2,
SDOperand Op3) {
return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperandPtr Ops, unsigned NumOps) {
return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops, NumOps).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2);
SDOperand Op;
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, &Op, 0).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2);
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, &Op1, 1).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1,
SDOperand Op2) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2);
SDOperand Ops[] = { Op1, Op2 };
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, 2).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1,
SDOperand Op2, SDOperand Op3) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2);
SDOperand Ops[] = { Op1, Op2, Op3 };
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, 3).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2,
SDOperandPtr Ops, unsigned NumOps) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2);
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, NumOps).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
SDOperand Op1, SDOperand Op2) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2, VT3);
SDOperand Ops[] = { Op1, Op2 };
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, 2).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
SDOperand Op1, SDOperand Op2,
SDOperand Op3) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2, VT3);
SDOperand Ops[] = { Op1, Op2, Op3 };
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, 3).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
SDOperandPtr Ops, unsigned NumOps) {
const MVT::ValueType *VTs = getNodeValueTypes(VT1, VT2, VT3);
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, NumOps).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
MVT::ValueType VT4,
SDOperandPtr Ops, unsigned NumOps) {
std::vector<MVT::ValueType> VTList;
VTList.push_back(VT1);
VTList.push_back(VT2);
VTList.push_back(VT3);
VTList.push_back(VT4);
const MVT::ValueType *VTs = getNodeValueTypes(VTList);
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 4, Ops, NumOps).Val;
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode,
std::vector<MVT::ValueType> &ResultTys,
SDOperandPtr Ops, unsigned NumOps) {
const MVT::ValueType *VTs = getNodeValueTypes(ResultTys);
return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, ResultTys.size(),
Ops, NumOps).Val;
}
/// getNodeIfExists - Get the specified node if it's already available, or
/// else return NULL.
SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
SDOperandPtr Ops, unsigned NumOps) {
if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return E;
}
return NULL;
}
/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
/// This can cause recursive merging of nodes in the DAG.
///
/// This version assumes From has a single result value.
///
void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand To,
DAGUpdateListener *UpdateListener) {
SDNode *From = FromN.Val;
assert(From->getNumValues() == 1 && FromN.ResNo == 0 &&
"Cannot replace with this method!");
assert(From != To.Val && "Cannot replace uses of with self");
while (!From->use_empty()) {
SDNode::use_iterator UI = From->use_begin();
SDNode *U = UI->getUser();
// This node is about to morph, remove its old self from the CSE maps.
RemoveNodeFromCSEMaps(U);
int operandNum = 0;
for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
I != E; ++I, ++operandNum)
if (I->getVal() == From) {
From->removeUser(operandNum, U);
*I = To;
I->setUser(U);
To.Val->addUser(operandNum, U);
}
// Now that we have modified U, add it back to the CSE maps. If it already
// exists there, recursively merge the results together.
if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
ReplaceAllUsesWith(U, Existing, UpdateListener);
// U is now dead. Inform the listener if it exists and delete it.
if (UpdateListener)
UpdateListener->NodeDeleted(U);
DeleteNodeNotInCSEMaps(U);
} else {
// If the node doesn't already exist, we updated it. Inform a listener if
// it exists.
if (UpdateListener)
UpdateListener->NodeUpdated(U);
}
}
}
/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
/// This can cause recursive merging of nodes in the DAG.
///
/// This version assumes From/To have matching types and numbers of result
/// values.
///
void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
DAGUpdateListener *UpdateListener) {
assert(From != To && "Cannot replace uses of with self");
assert(From->getNumValues() == To->getNumValues() &&
"Cannot use this version of ReplaceAllUsesWith!");
if (From->getNumValues() == 1) // If possible, use the faster version.
return ReplaceAllUsesWith(SDOperand(From, 0), SDOperand(To, 0),
UpdateListener);
while (!From->use_empty()) {
SDNode::use_iterator UI = From->use_begin();
SDNode *U = UI->getUser();
// This node is about to morph, remove its old self from the CSE maps.
RemoveNodeFromCSEMaps(U);
int operandNum = 0;
for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
I != E; ++I, ++operandNum)
if (I->getVal() == From) {
From->removeUser(operandNum, U);
I->getVal() = To;
To->addUser(operandNum, U);
}
// Now that we have modified U, add it back to the CSE maps. If it already
// exists there, recursively merge the results together.
if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
ReplaceAllUsesWith(U, Existing, UpdateListener);
// U is now dead. Inform the listener if it exists and delete it.
if (UpdateListener)
UpdateListener->NodeDeleted(U);
DeleteNodeNotInCSEMaps(U);
} else {
// If the node doesn't already exist, we updated it. Inform a listener if
// it exists.
if (UpdateListener)
UpdateListener->NodeUpdated(U);
}
}
}
/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
/// This can cause recursive merging of nodes in the DAG.
///
/// This version can replace From with any result values. To must match the
/// number and types of values returned by From.
void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
SDOperandPtr To,
DAGUpdateListener *UpdateListener) {
if (From->getNumValues() == 1) // Handle the simple case efficiently.
return ReplaceAllUsesWith(SDOperand(From, 0), To[0], UpdateListener);
while (!From->use_empty()) {
SDNode::use_iterator UI = From->use_begin();
SDNode *U = UI->getUser();
// This node is about to morph, remove its old self from the CSE maps.
RemoveNodeFromCSEMaps(U);
int operandNum = 0;
for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
I != E; ++I, ++operandNum)
if (I->getVal() == From) {
const SDOperand &ToOp = To[I->getSDOperand().ResNo];
From->removeUser(operandNum, U);
*I = ToOp;
I->setUser(U);
ToOp.Val->addUser(operandNum, U);
}
// Now that we have modified U, add it back to the CSE maps. If it already
// exists there, recursively merge the results together.
if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
ReplaceAllUsesWith(U, Existing, UpdateListener);
// U is now dead. Inform the listener if it exists and delete it.
if (UpdateListener)
UpdateListener->NodeDeleted(U);
DeleteNodeNotInCSEMaps(U);
} else {
// If the node doesn't already exist, we updated it. Inform a listener if
// it exists.
if (UpdateListener)
UpdateListener->NodeUpdated(U);
}
}
}
namespace {
/// ChainedSetUpdaterListener - This class is a DAGUpdateListener that removes
/// any deleted nodes from the set passed into its constructor and recursively
/// notifies another update listener if specified.
class ChainedSetUpdaterListener :
public SelectionDAG::DAGUpdateListener {
SmallSetVector<SDNode*, 16> &Set;
SelectionDAG::DAGUpdateListener *Chain;
public:
ChainedSetUpdaterListener(SmallSetVector<SDNode*, 16> &set,
SelectionDAG::DAGUpdateListener *chain)
: Set(set), Chain(chain) {}
virtual void NodeDeleted(SDNode *N) {
Set.remove(N);
if (Chain) Chain->NodeDeleted(N);
}
virtual void NodeUpdated(SDNode *N) {
if (Chain) Chain->NodeUpdated(N);
}
};
}
/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
/// uses of other values produced by From.Val alone. The Deleted vector is
/// handled the same way as for ReplaceAllUsesWith.
void SelectionDAG::ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
DAGUpdateListener *UpdateListener){
assert(From != To && "Cannot replace a value with itself");
// Handle the simple, trivial, case efficiently.
if (From.Val->getNumValues() == 1) {
ReplaceAllUsesWith(From, To, UpdateListener);
return;
}
if (From.use_empty()) return;
// Get all of the users of From.Val. We want these in a nice,
// deterministically ordered and uniqued set, so we use a SmallSetVector.
SmallSetVector<SDNode*, 16> Users;
for (SDNode::use_iterator UI = From.Val->use_begin(),
E = From.Val->use_end(); UI != E; ++UI) {
SDNode *User = UI->getUser();
if (!Users.count(User))
Users.insert(User);
}
// When one of the recursive merges deletes nodes from the graph, we need to
// make sure that UpdateListener is notified *and* that the node is removed
// from Users if present. CSUL does this.
ChainedSetUpdaterListener CSUL(Users, UpdateListener);
while (!Users.empty()) {
// We know that this user uses some value of From. If it is the right
// value, update it.
SDNode *User = Users.back();
Users.pop_back();
// Scan for an operand that matches From.
SDNode::op_iterator Op = User->op_begin(), E = User->op_end();
for (; Op != E; ++Op)
if (*Op == From) break;
// If there are no matches, the user must use some other result of From.
if (Op == E) continue;
// Okay, we know this user needs to be updated. Remove its old self
// from the CSE maps.
RemoveNodeFromCSEMaps(User);
// Update all operands that match "From" in case there are multiple uses.
for (; Op != E; ++Op) {
if (*Op == From) {
From.Val->removeUser(Op-User->op_begin(), User);
*Op = To;
Op->setUser(User);
To.Val->addUser(Op-User->op_begin(), User);
}
}
// Now that we have modified User, add it back to the CSE maps. If it
// already exists there, recursively merge the results together.
SDNode *Existing = AddNonLeafNodeToCSEMaps(User);
if (!Existing) {
if (UpdateListener) UpdateListener->NodeUpdated(User);
continue; // Continue on to next user.
}
// If there was already an existing matching node, use ReplaceAllUsesWith
// to replace the dead one with the existing one. This can cause
// recursive merging of other unrelated nodes down the line. The merging
// can cause deletion of nodes that used the old value. To handle this, we
// use CSUL to remove them from the Users set.
ReplaceAllUsesWith(User, Existing, &CSUL);
// User is now dead. Notify a listener if present.
if (UpdateListener) UpdateListener->NodeDeleted(User);
DeleteNodeNotInCSEMaps(User);
}
}
/// AssignNodeIds - Assign a unique node id for each node in the DAG based on
/// their allnodes order. It returns the maximum id.
unsigned SelectionDAG::AssignNodeIds() {
unsigned Id = 0;
for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I){
SDNode *N = I;
N->setNodeId(Id++);
}
return Id;
}
/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
/// based on their topological order. It returns the maximum id and a vector
/// of the SDNodes* in assigned order by reference.
unsigned SelectionDAG::AssignTopologicalOrder(std::vector<SDNode*> &TopOrder) {
unsigned DAGSize = AllNodes.size();
std::vector<unsigned> InDegree(DAGSize);
std::vector<SDNode*> Sources;
// Use a two pass approach to avoid using a std::map which is slow.
unsigned Id = 0;
for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I){
SDNode *N = I;
N->setNodeId(Id++);
unsigned Degree = N->use_size();
InDegree[N->getNodeId()] = Degree;
if (Degree == 0)
Sources.push_back(N);
}
TopOrder.clear();
while (!Sources.empty()) {
SDNode *N = Sources.back();
Sources.pop_back();
TopOrder.push_back(N);
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
SDNode *P = I->getVal();
unsigned Degree = --InDegree[P->getNodeId()];
if (Degree == 0)
Sources.push_back(P);
}
}
// Second pass, assign the actual topological order as node ids.
Id = 0;
for (std::vector<SDNode*>::iterator TI = TopOrder.begin(),TE = TopOrder.end();
TI != TE; ++TI)
(*TI)->setNodeId(Id++);
return Id;
}
//===----------------------------------------------------------------------===//
// SDNode Class
//===----------------------------------------------------------------------===//
// Out-of-line virtual method to give class a home.
void SDNode::ANCHOR() {}
void UnarySDNode::ANCHOR() {}
void BinarySDNode::ANCHOR() {}
void TernarySDNode::ANCHOR() {}
void HandleSDNode::ANCHOR() {}
void StringSDNode::ANCHOR() {}
void ConstantSDNode::ANCHOR() {}
void ConstantFPSDNode::ANCHOR() {}
void GlobalAddressSDNode::ANCHOR() {}
void FrameIndexSDNode::ANCHOR() {}
void JumpTableSDNode::ANCHOR() {}
void ConstantPoolSDNode::ANCHOR() {}
void BasicBlockSDNode::ANCHOR() {}
void SrcValueSDNode::ANCHOR() {}
void MemOperandSDNode::ANCHOR() {}
void RegisterSDNode::ANCHOR() {}
void ExternalSymbolSDNode::ANCHOR() {}
void CondCodeSDNode::ANCHOR() {}
void ARG_FLAGSSDNode::ANCHOR() {}
void VTSDNode::ANCHOR() {}
void LoadSDNode::ANCHOR() {}
void StoreSDNode::ANCHOR() {}
void AtomicSDNode::ANCHOR() {}
HandleSDNode::~HandleSDNode() {
SDVTList VTs = { 0, 0 };
MorphNodeTo(ISD::HANDLENODE, VTs, SDOperandPtr(), 0); // Drops operand uses.
}
GlobalAddressSDNode::GlobalAddressSDNode(bool isTarget, const GlobalValue *GA,
MVT::ValueType VT, int o)
: SDNode(isa<GlobalVariable>(GA) &&
cast<GlobalVariable>(GA)->isThreadLocal() ?
// Thread Local
(isTarget ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress) :
// Non Thread Local
(isTarget ? ISD::TargetGlobalAddress : ISD::GlobalAddress),
getSDVTList(VT)), Offset(o) {
TheGlobal = const_cast<GlobalValue*>(GA);
}
/// getMemOperand - Return a MachineMemOperand object describing the memory
/// reference performed by this load or store.
MachineMemOperand LSBaseSDNode::getMemOperand() const {
int Size = (MVT::getSizeInBits(getMemoryVT()) + 7) >> 3;
int Flags =
getOpcode() == ISD::LOAD ? MachineMemOperand::MOLoad :
MachineMemOperand::MOStore;
if (IsVolatile) Flags |= MachineMemOperand::MOVolatile;
// Check if the load references a frame index, and does not have
// an SV attached.
const FrameIndexSDNode *FI =
dyn_cast<const FrameIndexSDNode>(getBasePtr().Val);
if (!getSrcValue() && FI)
return MachineMemOperand(PseudoSourceValue::getFixedStack(), Flags,
FI->getIndex(), Size, Alignment);
else
return MachineMemOperand(getSrcValue(), Flags,
getSrcValueOffset(), Size, Alignment);
}
/// Profile - Gather unique data for the node.
///
void SDNode::Profile(FoldingSetNodeID &ID) {
AddNodeIDNode(ID, this);
}
/// getValueTypeList - Return a pointer to the specified value type.
///
const MVT::ValueType *SDNode::getValueTypeList(MVT::ValueType VT) {
if (MVT::isExtendedVT(VT)) {
static std::set<MVT::ValueType> EVTs;
return &(*EVTs.insert(VT).first);
} else {
static MVT::ValueType VTs[MVT::LAST_VALUETYPE];
VTs[VT] = VT;
return &VTs[VT];
}
}
/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
/// indicated value. This method ignores uses of other values defined by this
/// operation.
bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
assert(Value < getNumValues() && "Bad value!");
// If there is only one value, this is easy.
if (getNumValues() == 1)
return use_size() == NUses;
if (use_size() < NUses) return false;
SDOperand TheValue(const_cast<SDNode *>(this), Value);
SmallPtrSet<SDNode*, 32> UsersHandled;
// TODO: Only iterate over uses of a given value of the node
for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
if (*UI == TheValue) {
if (NUses == 0)
return false;
--NUses;
}
}
// Found exactly the right number of uses?
return NUses == 0;
}
/// hasAnyUseOfValue - Return true if there are any use of the indicated
/// value. This method ignores uses of other values defined by this operation.
bool SDNode::hasAnyUseOfValue(unsigned Value) const {
assert(Value < getNumValues() && "Bad value!");
if (use_empty()) return false;
SDOperand TheValue(const_cast<SDNode *>(this), Value);
SmallPtrSet<SDNode*, 32> UsersHandled;
for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
SDNode *User = UI->getUser();
if (User->getNumOperands() == 1 ||
UsersHandled.insert(User)) // First time we've seen this?
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i)
if (User->getOperand(i) == TheValue) {
return true;
}
}
return false;
}
/// isOnlyUseOf - Return true if this node is the only use of N.
///
bool SDNode::isOnlyUseOf(SDNode *N) const {
bool Seen = false;
for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
SDNode *User = I->getUser();
if (User == this)
Seen = true;
else
return false;
}
return Seen;
}
/// isOperand - Return true if this node is an operand of N.
///
bool SDOperand::isOperandOf(SDNode *N) const {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
if (*this == N->getOperand(i))
return true;
return false;
}
bool SDNode::isOperandOf(SDNode *N) const {
for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
if (this == N->OperandList[i].getVal())
return true;
return false;
}
/// reachesChainWithoutSideEffects - Return true if this operand (which must
/// be a chain) reaches the specified operand without crossing any
/// side-effecting instructions. In practice, this looks through token
/// factors and non-volatile loads. In order to remain efficient, this only
/// looks a couple of nodes in, it does not do an exhaustive search.
bool SDOperand::reachesChainWithoutSideEffects(SDOperand Dest,
unsigned Depth) const {
if (*this == Dest) return true;
// Don't search too deeply, we just want to be able to see through
// TokenFactor's etc.
if (Depth == 0) return false;
// If this is a token factor, all inputs to the TF happen in parallel. If any
// of the operands of the TF reach dest, then we can do the xform.
if (getOpcode() == ISD::TokenFactor) {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
return true;
return false;
}
// Loads don't have side effects, look through them.
if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
if (!Ld->isVolatile())
return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
}
return false;
}
static void findPredecessor(SDNode *N, const SDNode *P, bool &found,
SmallPtrSet<SDNode *, 32> &Visited) {
if (found || !Visited.insert(N))
return;
for (unsigned i = 0, e = N->getNumOperands(); !found && i != e; ++i) {
SDNode *Op = N->getOperand(i).Val;
if (Op == P) {
found = true;
return;
}
findPredecessor(Op, P, found, Visited);
}
}
/// isPredecessorOf - Return true if this node is a predecessor of N. This node
/// is either an operand of N or it can be reached by recursively traversing
/// up the operands.
/// NOTE: this is an expensive method. Use it carefully.
bool SDNode::isPredecessorOf(SDNode *N) const {
SmallPtrSet<SDNode *, 32> Visited;
bool found = false;
findPredecessor(N, this, found, Visited);
return found;
}
uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
assert(Num < NumOperands && "Invalid child # of SDNode!");
return cast<ConstantSDNode>(OperandList[Num])->getValue();
}
std::string SDNode::getOperationName(const SelectionDAG *G) const {
switch (getOpcode()) {
default:
if (getOpcode() < ISD::BUILTIN_OP_END)
return "<<Unknown DAG Node>>";
else {
if (G) {
if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
if (getOpcode()-ISD::BUILTIN_OP_END < TII->getNumOpcodes())
return TII->get(getOpcode()-ISD::BUILTIN_OP_END).getName();
TargetLowering &TLI = G->getTargetLoweringInfo();
const char *Name =
TLI.getTargetNodeName(getOpcode());
if (Name) return Name;
}
return "<<Unknown Target Node>>";
}
case ISD::PREFETCH: return "Prefetch";
case ISD::MEMBARRIER: return "MemBarrier";
case ISD::ATOMIC_LCS: return "AtomicLCS";
case ISD::ATOMIC_LAS: return "AtomicLAS";
case ISD::ATOMIC_LSS: return "AtomicLSS";
case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd";
case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr";
case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor";
case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin";
case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax";
case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin";
case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax";
case ISD::ATOMIC_SWAP: return "AtomicSWAP";
case ISD::PCMARKER: return "PCMarker";
case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
case ISD::SRCVALUE: return "SrcValue";
case ISD::MEMOPERAND: return "MemOperand";
case ISD::EntryToken: return "EntryToken";
case ISD::TokenFactor: return "TokenFactor";
case ISD::AssertSext: return "AssertSext";
case ISD::AssertZext: return "AssertZext";
case ISD::STRING: return "String";
case ISD::BasicBlock: return "BasicBlock";
case ISD::ARG_FLAGS: return "ArgFlags";
case ISD::VALUETYPE: return "ValueType";
case ISD::Register: return "Register";
case ISD::Constant: return "Constant";
case ISD::ConstantFP: return "ConstantFP";
case ISD::GlobalAddress: return "GlobalAddress";
case ISD::GlobalTLSAddress: return "GlobalTLSAddress";
case ISD::FrameIndex: return "FrameIndex";
case ISD::JumpTable: return "JumpTable";
case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE";
case ISD::RETURNADDR: return "RETURNADDR";
case ISD::FRAMEADDR: return "FRAMEADDR";
case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET";
case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR";
case ISD::EHSELECTION: return "EHSELECTION";
case ISD::EH_RETURN: return "EH_RETURN";
case ISD::ConstantPool: return "ConstantPool";
case ISD::ExternalSymbol: return "ExternalSymbol";
case ISD::INTRINSIC_WO_CHAIN: {
unsigned IID = cast<ConstantSDNode>(getOperand(0))->getValue();
return Intrinsic::getName((Intrinsic::ID)IID);
}
case ISD::INTRINSIC_VOID:
case ISD::INTRINSIC_W_CHAIN: {
unsigned IID = cast<ConstantSDNode>(getOperand(1))->getValue();
return Intrinsic::getName((Intrinsic::ID)IID);
}
case ISD::BUILD_VECTOR: return "BUILD_VECTOR";
case ISD::TargetConstant: return "TargetConstant";
case ISD::TargetConstantFP:return "TargetConstantFP";
case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress";
case ISD::TargetFrameIndex: return "TargetFrameIndex";
case ISD::TargetJumpTable: return "TargetJumpTable";
case ISD::TargetConstantPool: return "TargetConstantPool";
case ISD::TargetExternalSymbol: return "TargetExternalSymbol";
case ISD::CopyToReg: return "CopyToReg";
case ISD::CopyFromReg: return "CopyFromReg";
case ISD::UNDEF: return "undef";
case ISD::MERGE_VALUES: return "merge_values";
case ISD::INLINEASM: return "inlineasm";
case ISD::LABEL: return "label";
case ISD::DECLARE: return "declare";
case ISD::HANDLENODE: return "handlenode";
case ISD::FORMAL_ARGUMENTS: return "formal_arguments";
case ISD::CALL: return "call";
// Unary operators
case ISD::FABS: return "fabs";
case ISD::FNEG: return "fneg";
case ISD::FSQRT: return "fsqrt";
case ISD::FSIN: return "fsin";
case ISD::FCOS: return "fcos";
case ISD::FPOWI: return "fpowi";
case ISD::FPOW: return "fpow";
// Binary operators
case ISD::ADD: return "add";
case ISD::SUB: return "sub";
case ISD::MUL: return "mul";
case ISD::MULHU: return "mulhu";
case ISD::MULHS: return "mulhs";
case ISD::SDIV: return "sdiv";
case ISD::UDIV: return "udiv";
case ISD::SREM: return "srem";
case ISD::UREM: return "urem";
case ISD::SMUL_LOHI: return "smul_lohi";
case ISD::UMUL_LOHI: return "umul_lohi";
case ISD::SDIVREM: return "sdivrem";
case ISD::UDIVREM: return "divrem";
case ISD::AND: return "and";
case ISD::OR: return "or";
case ISD::XOR: return "xor";
case ISD::SHL: return "shl";
case ISD::SRA: return "sra";
case ISD::SRL: return "srl";
case ISD::ROTL: return "rotl";
case ISD::ROTR: return "rotr";
case ISD::FADD: return "fadd";
case ISD::FSUB: return "fsub";
case ISD::FMUL: return "fmul";
case ISD::FDIV: return "fdiv";
case ISD::FREM: return "frem";
case ISD::FCOPYSIGN: return "fcopysign";
case ISD::FGETSIGN: return "fgetsign";
case ISD::SETCC: return "setcc";
case ISD::VSETCC: return "vsetcc";
case ISD::SELECT: return "select";
case ISD::SELECT_CC: return "select_cc";
case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
case ISD::CONCAT_VECTORS: return "concat_vectors";
case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
case ISD::VECTOR_SHUFFLE: return "vector_shuffle";
case ISD::CARRY_FALSE: return "carry_false";
case ISD::ADDC: return "addc";
case ISD::ADDE: return "adde";
case ISD::SUBC: return "subc";
case ISD::SUBE: return "sube";
case ISD::SHL_PARTS: return "shl_parts";
case ISD::SRA_PARTS: return "sra_parts";
case ISD::SRL_PARTS: return "srl_parts";
case ISD::EXTRACT_SUBREG: return "extract_subreg";
case ISD::INSERT_SUBREG: return "insert_subreg";
// Conversion operators.
case ISD::SIGN_EXTEND: return "sign_extend";
case ISD::ZERO_EXTEND: return "zero_extend";
case ISD::ANY_EXTEND: return "any_extend";
case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
case ISD::TRUNCATE: return "truncate";
case ISD::FP_ROUND: return "fp_round";
case ISD::FLT_ROUNDS_: return "flt_rounds";
case ISD::FP_ROUND_INREG: return "fp_round_inreg";
case ISD::FP_EXTEND: return "fp_extend";
case ISD::SINT_TO_FP: return "sint_to_fp";
case ISD::UINT_TO_FP: return "uint_to_fp";
case ISD::FP_TO_SINT: return "fp_to_sint";
case ISD::FP_TO_UINT: return "fp_to_uint";
case ISD::BIT_CONVERT: return "bit_convert";
// Control flow instructions
case ISD::BR: return "br";
case ISD::BRIND: return "brind";
case ISD::BR_JT: return "br_jt";
case ISD::BRCOND: return "brcond";
case ISD::BR_CC: return "br_cc";
case ISD::RET: return "ret";
case ISD::CALLSEQ_START: return "callseq_start";
case ISD::CALLSEQ_END: return "callseq_end";
// Other operators
case ISD::LOAD: return "load";
case ISD::STORE: return "store";
case ISD::VAARG: return "vaarg";
case ISD::VACOPY: return "vacopy";
case ISD::VAEND: return "vaend";
case ISD::VASTART: return "vastart";
case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc";
case ISD::EXTRACT_ELEMENT: return "extract_element";
case ISD::BUILD_PAIR: return "build_pair";
case ISD::STACKSAVE: return "stacksave";
case ISD::STACKRESTORE: return "stackrestore";
case ISD::TRAP: return "trap";
// Bit manipulation
case ISD::BSWAP: return "bswap";
case ISD::CTPOP: return "ctpop";
case ISD::CTTZ: return "cttz";
case ISD::CTLZ: return "ctlz";
// Debug info
case ISD::LOCATION: return "location";
case ISD::DEBUG_LOC: return "debug_loc";
// Trampolines
case ISD::TRAMPOLINE: return "trampoline";
case ISD::CONDCODE:
switch (cast<CondCodeSDNode>(this)->get()) {
default: assert(0 && "Unknown setcc condition!");
case ISD::SETOEQ: return "setoeq";
case ISD::SETOGT: return "setogt";
case ISD::SETOGE: return "setoge";
case ISD::SETOLT: return "setolt";
case ISD::SETOLE: return "setole";
case ISD::SETONE: return "setone";
case ISD::SETO: return "seto";
case ISD::SETUO: return "setuo";
case ISD::SETUEQ: return "setue";
case ISD::SETUGT: return "setugt";
case ISD::SETUGE: return "setuge";
case ISD::SETULT: return "setult";
case ISD::SETULE: return "setule";
case ISD::SETUNE: return "setune";
case ISD::SETEQ: return "seteq";
case ISD::SETGT: return "setgt";
case ISD::SETGE: return "setge";
case ISD::SETLT: return "setlt";
case ISD::SETLE: return "setle";
case ISD::SETNE: return "setne";
}
}
}
const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) {
switch (AM) {
default:
return "";
case ISD::PRE_INC:
return "<pre-inc>";
case ISD::PRE_DEC:
return "<pre-dec>";
case ISD::POST_INC:
return "<post-inc>";
case ISD::POST_DEC:
return "<post-dec>";
}
}
std::string ISD::ArgFlagsTy::getArgFlagsString() {
std::string S = "< ";
if (isZExt())
S += "zext ";
if (isSExt())
S += "sext ";
if (isInReg())
S += "inreg ";
if (isSRet())
S += "sret ";
if (isByVal())
S += "byval ";
if (isNest())
S += "nest ";
if (getByValAlign())
S += "byval-align:" + utostr(getByValAlign()) + " ";
if (getOrigAlign())
S += "orig-align:" + utostr(getOrigAlign()) + " ";
if (getByValSize())
S += "byval-size:" + utostr(getByValSize()) + " ";
return S + ">";
}
void SDNode::dump() const { dump(0); }
void SDNode::dump(const SelectionDAG *G) const {
cerr << (void*)this << ": ";
for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
if (i) cerr << ",";
if (getValueType(i) == MVT::Other)
cerr << "ch";
else
cerr << MVT::getValueTypeString(getValueType(i));
}
cerr << " = " << getOperationName(G);
cerr << " ";
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
if (i) cerr << ", ";
cerr << (void*)getOperand(i).Val;
if (unsigned RN = getOperand(i).ResNo)
cerr << ":" << RN;
}
if (!isTargetOpcode() && getOpcode() == ISD::VECTOR_SHUFFLE) {
SDNode *Mask = getOperand(2).Val;
cerr << "<";
for (unsigned i = 0, e = Mask->getNumOperands(); i != e; ++i) {
if (i) cerr << ",";
if (Mask->getOperand(i).getOpcode() == ISD::UNDEF)
cerr << "u";
else
cerr << cast<ConstantSDNode>(Mask->getOperand(i))->getValue();
}
cerr << ">";
}
if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
cerr << "<" << CSDN->getValue() << ">";
} else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
cerr << "<" << CSDN->getValueAPF().convertToFloat() << ">";
else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
cerr << "<" << CSDN->getValueAPF().convertToDouble() << ">";
else {
cerr << "<APFloat(";
CSDN->getValueAPF().convertToAPInt().dump();
cerr << ")>";
}
} else if (const GlobalAddressSDNode *GADN =
dyn_cast<GlobalAddressSDNode>(this)) {
int offset = GADN->getOffset();
cerr << "<";
WriteAsOperand(*cerr.stream(), GADN->getGlobal()) << ">";
if (offset > 0)
cerr << " + " << offset;
else
cerr << " " << offset;
} else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
cerr << "<" << FIDN->getIndex() << ">";
} else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
cerr << "<" << JTDN->getIndex() << ">";
} else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
int offset = CP->getOffset();
if (CP->isMachineConstantPoolEntry())
cerr << "<" << *CP->getMachineCPVal() << ">";
else
cerr << "<" << *CP->getConstVal() << ">";
if (offset > 0)
cerr << " + " << offset;
else
cerr << " " << offset;
} else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
cerr << "<";
const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
if (LBB)
cerr << LBB->getName() << " ";
cerr << (const void*)BBDN->getBasicBlock() << ">";
} else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
if (G && R->getReg() &&
TargetRegisterInfo::isPhysicalRegister(R->getReg())) {
cerr << " " << G->getTarget().getRegisterInfo()->getName(R->getReg());
} else {
cerr << " #" << R->getReg();
}
} else if (const ExternalSymbolSDNode *ES =
dyn_cast<ExternalSymbolSDNode>(this)) {
cerr << "'" << ES->getSymbol() << "'";
} else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
if (M->getValue())
cerr << "<" << M->getValue() << ">";
else
cerr << "<null>";
} else if (const MemOperandSDNode *M = dyn_cast<MemOperandSDNode>(this)) {
if (M->MO.getValue())
cerr << "<" << M->MO.getValue() << ":" << M->MO.getOffset() << ">";
else
cerr << "<null:" << M->MO.getOffset() << ">";
} else if (const ARG_FLAGSSDNode *N = dyn_cast<ARG_FLAGSSDNode>(this)) {
cerr << N->getArgFlags().getArgFlagsString();
} else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
cerr << ":" << MVT::getValueTypeString(N->getVT());
} else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
const Value *SrcValue = LD->getSrcValue();
int SrcOffset = LD->getSrcValueOffset();
cerr << " <";
if (SrcValue)
cerr << SrcValue;
else
cerr << "null";
cerr << ":" << SrcOffset << ">";
bool doExt = true;
switch (LD->getExtensionType()) {
default: doExt = false; break;
case ISD::EXTLOAD:
cerr << " <anyext ";
break;
case ISD::SEXTLOAD:
cerr << " <sext ";
break;
case ISD::ZEXTLOAD:
cerr << " <zext ";
break;
}
if (doExt)
cerr << MVT::getValueTypeString(LD->getMemoryVT()) << ">";
const char *AM = getIndexedModeName(LD->getAddressingMode());
if (*AM)
cerr << " " << AM;
if (LD->isVolatile())
cerr << " <volatile>";
cerr << " alignment=" << LD->getAlignment();
} else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
const Value *SrcValue = ST->getSrcValue();
int SrcOffset = ST->getSrcValueOffset();
cerr << " <";
if (SrcValue)
cerr << SrcValue;
else
cerr << "null";
cerr << ":" << SrcOffset << ">";
if (ST->isTruncatingStore())
cerr << " <trunc "
<< MVT::getValueTypeString(ST->getMemoryVT()) << ">";
const char *AM = getIndexedModeName(ST->getAddressingMode());
if (*AM)
cerr << " " << AM;
if (ST->isVolatile())
cerr << " <volatile>";
cerr << " alignment=" << ST->getAlignment();
}
}
static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
if (N->getOperand(i).Val->hasOneUse())
DumpNodes(N->getOperand(i).Val, indent+2, G);
else
cerr << "\n" << std::string(indent+2, ' ')
<< (void*)N->getOperand(i).Val << ": <multiple use>";
cerr << "\n" << std::string(indent, ' ');
N->dump(G);
}
void SelectionDAG::dump() const {
cerr << "SelectionDAG has " << AllNodes.size() << " nodes:";
std::vector<const SDNode*> Nodes;
for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end();
I != E; ++I)
Nodes.push_back(I);
std::sort(Nodes.begin(), Nodes.end());
for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val)
DumpNodes(Nodes[i], 2, this);
}
if (getRoot().Val) DumpNodes(getRoot().Val, 2, this);
cerr << "\n\n";
}
const Type *ConstantPoolSDNode::getType() const {
if (isMachineConstantPoolEntry())
return Val.MachineCPVal->getType();
return Val.ConstVal->getType();
}
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