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llvm-6502/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
Dan Gohman c533612949 Remove SDNode's virtual destructor. This makes it impossible for 
SDNode subclasses to keep state that requires non-trivial
destructors, however it was already effectively impossible,
since the destructor isn't actually ever called. There currently
aren't any SDNode subclasses affected by this, and in general
it's desireable to keep SDNode objects light-weight.

This eliminates the last virtual member function in the SDNode
class, so it eliminates the need for a vtable pointer, making
SDNode smaller.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62539 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-19 22:39:36 +00:00

5453 lines
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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/Analysis/ValueTracking.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/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/Support/CommandLine.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.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 *VTs, unsigned NumVTs) {
SDVTList Res = {VTs, NumVTs};
return Res;
}
static const fltSemantics *MVTToAPFloatSemantics(MVT VT) {
switch (VT.getSimpleVT()) {
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 getValueAPF().bitwiseIsEqual(V);
}
bool ConstantFPSDNode::isValueValidForType(MVT VT,
const APFloat& Val) {
assert(VT.isFloatingPoint() && "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);
bool losesInfo;
(void) Val2.convert(*MVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven,
&losesInfo);
return !losesInfo;
}
//===----------------------------------------------------------------------===//
// 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).getNode();
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.
SDValue 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().
bitcastToAPInt().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).getNode();
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.
SDValue 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) {
SDValue 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::DBG_LABEL or TargetInstrInfo::DBG_LABEL node).
bool ISD::isDebugLabel(const SDNode *N) {
SDValue Zero;
if (N->getOpcode() == ISD::DBG_LABEL)
return true;
if (N->isMachineOpcode() &&
N->getMachineOpcode() == TargetInstrInfo::DBG_LABEL)
return true;
return false;
}
/// 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::SETOEQ: // SETEQ & SETU[LG]E
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 MF->getTarget();
}
//===----------------------------------------------------------------------===//
// 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,
const SDValue *Ops, unsigned NumOps) {
for (; NumOps; --NumOps, ++Ops) {
ID.AddPointer(Ops->getNode());
ID.AddInteger(Ops->getResNo());
}
}
/// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
///
static void AddNodeIDOperands(FoldingSetNodeID &ID,
const SDUse *Ops, unsigned NumOps) {
for (; NumOps; --NumOps, ++Ops) {
ID.AddPointer(Ops->getVal());
ID.AddInteger(Ops->getSDValue().getResNo());
}
}
static void AddNodeIDNode(FoldingSetNodeID &ID,
unsigned short OpC, SDVTList VTList,
const SDValue *OpList, unsigned N) {
AddNodeIDOpcode(ID, OpC);
AddNodeIDValueTypes(ID, VTList);
AddNodeIDOperands(ID, OpList, N);
}
/// AddNodeIDCustom - If this is an SDNode with special info, add this info to
/// the NodeID data.
static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
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.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
break;
case ISD::TargetConstantFP:
case ISD::ConstantFP: {
ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
break;
}
case ISD::TargetGlobalAddress:
case ISD::GlobalAddress:
case ISD::TargetGlobalTLSAddress:
case ISD::GlobalTLSAddress: {
const 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::DBG_STOPPOINT: {
const DbgStopPointSDNode *DSP = cast<DbgStopPointSDNode>(N);
ID.AddInteger(DSP->getLine());
ID.AddInteger(DSP->getColumn());
ID.AddPointer(DSP->getCompileUnit());
break;
}
case ISD::SRCVALUE:
ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
break;
case ISD::MEMOPERAND: {
const MachineMemOperand &MO = cast<MemOperandSDNode>(N)->MO;
MO.Profile(ID);
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: {
const 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::CALL: {
const CallSDNode *Call = cast<CallSDNode>(N);
ID.AddInteger(Call->getCallingConv());
ID.AddInteger(Call->isVarArg());
break;
}
case ISD::LOAD: {
const LoadSDNode *LD = cast<LoadSDNode>(N);
ID.AddInteger(LD->getAddressingMode());
ID.AddInteger(LD->getExtensionType());
ID.AddInteger(LD->getMemoryVT().getRawBits());
ID.AddInteger(LD->getRawFlags());
break;
}
case ISD::STORE: {
const StoreSDNode *ST = cast<StoreSDNode>(N);
ID.AddInteger(ST->getAddressingMode());
ID.AddInteger(ST->isTruncatingStore());
ID.AddInteger(ST->getMemoryVT().getRawBits());
ID.AddInteger(ST->getRawFlags());
break;
}
case ISD::ATOMIC_CMP_SWAP:
case ISD::ATOMIC_SWAP:
case ISD::ATOMIC_LOAD_ADD:
case ISD::ATOMIC_LOAD_SUB:
case ISD::ATOMIC_LOAD_AND:
case ISD::ATOMIC_LOAD_OR:
case ISD::ATOMIC_LOAD_XOR:
case ISD::ATOMIC_LOAD_NAND:
case ISD::ATOMIC_LOAD_MIN:
case ISD::ATOMIC_LOAD_MAX:
case ISD::ATOMIC_LOAD_UMIN:
case ISD::ATOMIC_LOAD_UMAX: {
const AtomicSDNode *AT = cast<AtomicSDNode>(N);
ID.AddInteger(AT->getRawFlags());
break;
}
} // end switch (N->getOpcode())
}
/// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
/// data.
static void AddNodeIDNode(FoldingSetNodeID &ID, const 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.
AddNodeIDCustom(ID, N);
}
/// encodeMemSDNodeFlags - Generic routine for computing a value for use in
/// the CSE map that carries both alignment and volatility information.
///
static inline unsigned
encodeMemSDNodeFlags(bool isVolatile, unsigned Alignment) {
return isVolatile | ((Log2_32(Alignment) + 1) << 1);
}
//===----------------------------------------------------------------------===//
// SelectionDAG Class
//===----------------------------------------------------------------------===//
/// doNotCSE - Return true if CSE should not be performed for this node.
static bool doNotCSE(SDNode *N) {
if (N->getValueType(0) == MVT::Flag)
return true; // Never CSE anything that produces a flag.
switch (N->getOpcode()) {
default: break;
case ISD::HANDLENODE:
case ISD::DBG_LABEL:
case ISD::DBG_STOPPOINT:
case ISD::EH_LABEL:
case ISD::DECLARE:
return true; // Never CSE 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 true; // Never CSE anything that produces a flag.
return false;
}
/// 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);
RemoveDeadNodes(DeadNodes);
// If the root changed (e.g. it was a dead load, update the root).
setRoot(Dummy.getValue());
}
/// RemoveDeadNodes - This method deletes the unreachable nodes in the
/// given list, and any nodes that become unreachable as a result.
void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
DAGUpdateListener *UpdateListener) {
// 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, 0);
// 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);
}
DeallocateNode(N);
}
}
void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
SmallVector<SDNode*, 16> DeadNodes(1, N);
RemoveDeadNodes(DeadNodes, UpdateListener);
}
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) {
assert(N != AllNodes.begin());
// Drop all of the operands and decrement used node's 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);
DeallocateNode(N);
}
void SelectionDAG::DeallocateNode(SDNode *N) {
if (N->OperandsNeedDelete)
delete[] N->OperandList;
// Set the opcode to DELETED_NODE to help catch bugs when node
// memory is reallocated.
N->NodeType = ISD::DELETED_NODE;
NodeAllocator.Deallocate(AllNodes.remove(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.
bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
bool Erased = false;
switch (N->getOpcode()) {
case ISD::EntryToken:
assert(0 && "EntryToken should not be in CSEMaps!");
return false;
case ISD::HANDLENODE: return false; // noop.
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 VT = cast<VTSDNode>(N)->getVT();
if (VT.isExtended()) {
Erased = ExtendedValueTypeNodes.erase(VT);
} else {
Erased = ValueTypeNodes[VT.getSimpleVT()] != 0;
ValueTypeNodes[VT.getSimpleVT()] = 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->isMachineOpcode() && !doNotCSE(N)) {
N->dump(this);
cerr << "\n";
assert(0 && "Node is not in map!");
}
#endif
return Erased;
}
/// 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 (doNotCSE(N))
return 0;
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, SDValue Op,
void *&InsertPos) {
if (doNotCSE(N))
return 0;
SDValue Ops[] = { Op };
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
AddNodeIDCustom(ID, N);
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,
SDValue Op1, SDValue Op2,
void *&InsertPos) {
if (doNotCSE(N))
return 0;
SDValue Ops[] = { Op1, Op2 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
AddNodeIDCustom(ID, N);
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,
const SDValue *Ops,unsigned NumOps,
void *&InsertPos) {
if (doNotCSE(N))
return 0;
FoldingSetNodeID ID;
AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
AddNodeIDCustom(ID, N);
return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
}
/// VerifyNode - Sanity check the given node. Aborts if it is invalid.
void SelectionDAG::VerifyNode(SDNode *N) {
switch (N->getOpcode()) {
default:
break;
case ISD::BUILD_PAIR: {
MVT VT = N->getValueType(0);
assert(N->getNumValues() == 1 && "Too many results!");
assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
"Wrong return type!");
assert(N->getNumOperands() == 2 && "Wrong number of operands!");
assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
"Mismatched operand types!");
assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
"Wrong operand type!");
assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
"Wrong return type size");
break;
}
case ISD::BUILD_VECTOR: {
assert(N->getNumValues() == 1 && "Too many results!");
assert(N->getValueType(0).isVector() && "Wrong return type!");
assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
"Wrong number of operands!");
// FIXME: Change vector_shuffle to a variadic node with mask elements being
// operands of the node. Currently the mask is a BUILD_VECTOR passed as an
// operand, and it is not always possible to legalize it. Turning off the
// following checks at least makes it possible to legalize most of the time.
// MVT EltVT = N->getValueType(0).getVectorElementType();
// for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
// assert(I->getSDValue().getValueType() == EltVT &&
// "Wrong operand type!");
break;
}
}
}
/// getMVTAlignment - Compute the default alignment value for the
/// given type.
///
unsigned SelectionDAG::getMVTAlignment(MVT VT) const {
const Type *Ty = VT == MVT::iPTR ?
PointerType::get(Type::Int8Ty, 0) :
VT.getTypeForMVT();
return TLI.getTargetData()->getABITypeAlignment(Ty);
}
SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli)
: TLI(tli), FLI(fli),
EntryNode(ISD::EntryToken, getVTList(MVT::Other)),
Root(getEntryNode()) {
AllNodes.push_back(&EntryNode);
}
void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi,
DwarfWriter *dw) {
MF = &mf;
MMI = mmi;
DW = dw;
}
SelectionDAG::~SelectionDAG() {
allnodes_clear();
}
void SelectionDAG::allnodes_clear() {
assert(&*AllNodes.begin() == &EntryNode);
AllNodes.remove(AllNodes.begin());
while (!AllNodes.empty())
DeallocateNode(AllNodes.begin());
}
void SelectionDAG::clear() {
allnodes_clear();
OperandAllocator.Reset();
CSEMap.clear();
ExtendedValueTypeNodes.clear();
ExternalSymbols.clear();
TargetExternalSymbols.clear();
std::fill(CondCodeNodes.begin(), CondCodeNodes.end(),
static_cast<CondCodeSDNode*>(0));
std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(),
static_cast<SDNode*>(0));
EntryNode.Uses = 0;
AllNodes.push_back(&EntryNode);
Root = getEntryNode();
}
SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, MVT VT) {
if (Op.getValueType() == VT) return Op;
APInt Imm = APInt::getLowBitsSet(Op.getValueSizeInBits(),
VT.getSizeInBits());
return getNode(ISD::AND, Op.getValueType(), Op,
getConstant(Imm, Op.getValueType()));
}
SDValue SelectionDAG::getConstant(uint64_t Val, MVT VT, bool isT) {
MVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT;
return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
}
SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
return getConstant(*ConstantInt::get(Val), VT, isT);
}
SDValue SelectionDAG::getConstant(const ConstantInt &Val, MVT VT, bool isT) {
assert(VT.isInteger() && "Cannot create FP integer constant!");
MVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT;
assert(Val.getBitWidth() == EltVT.getSizeInBits() &&
"APInt size does not match type size!");
unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
ID.AddPointer(&Val);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
if (!VT.isVector())
return SDValue(N, 0);
if (!N) {
N = NodeAllocator.Allocate<ConstantSDNode>();
new (N) ConstantSDNode(isT, &Val, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}
SDValue Result(N, 0);
if (VT.isVector()) {
SmallVector<SDValue, 8> Ops;
Ops.assign(VT.getVectorNumElements(), Result);
Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
}
return Result;
}
SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
return getConstant(Val, TLI.getPointerTy(), isTarget);
}
SDValue SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) {
return getConstantFP(*ConstantFP::get(V), VT, isTarget);
}
SDValue SelectionDAG::getConstantFP(const ConstantFP& V, MVT VT, bool isTarget){
assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
MVT EltVT =
VT.isVector() ? VT.getVectorElementType() : 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), 0, 0);
ID.AddPointer(&V);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
if (!VT.isVector())
return SDValue(N, 0);
if (!N) {
N = NodeAllocator.Allocate<ConstantFPSDNode>();
new (N) ConstantFPSDNode(isTarget, &V, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}
SDValue Result(N, 0);
if (VT.isVector()) {
SmallVector<SDValue, 8> Ops;
Ops.assign(VT.getVectorNumElements(), Result);
Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
}
return Result;
}
SDValue SelectionDAG::getConstantFP(double Val, MVT VT, bool isTarget) {
MVT EltVT =
VT.isVector() ? VT.getVectorElementType() : VT;
if (EltVT==MVT::f32)
return getConstantFP(APFloat((float)Val), VT, isTarget);
else
return getConstantFP(APFloat(Val), VT, isTarget);
}
SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV,
MVT VT, int64_t Offset,
bool isTargetGA) {
unsigned Opc;
// Truncate (with sign-extension) the offset value to the pointer size.
unsigned BitWidth = TLI.getPointerTy().getSizeInBits();
if (BitWidth < 64)
Offset = (Offset << (64 - BitWidth) >> (64 - BitWidth));
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(false));
}
if (GVar && GVar->isThreadLocal())
Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
else
Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
ID.AddPointer(GV);
ID.AddInteger(Offset);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<GlobalAddressSDNode>();
new (N) GlobalAddressSDNode(isTargetGA, GV, VT, Offset);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getFrameIndex(int FI, MVT VT, bool isTarget) {
unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
ID.AddInteger(FI);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<FrameIndexSDNode>();
new (N) FrameIndexSDNode(FI, VT, isTarget);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getJumpTable(int JTI, MVT VT, bool isTarget){
unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
ID.AddInteger(JTI);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<JumpTableSDNode>();
new (N) JumpTableSDNode(JTI, VT, isTarget);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getConstantPool(Constant *C, MVT VT,
unsigned Alignment, int Offset,
bool isTarget) {
if (Alignment == 0)
Alignment =
TLI.getTargetData()->getPreferredTypeAlignmentShift(C->getType());
unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
ID.AddInteger(Alignment);
ID.AddInteger(Offset);
ID.AddPointer(C);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<ConstantPoolSDNode>();
new (N) ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, MVT VT,
unsigned Alignment, int Offset,
bool isTarget) {
if (Alignment == 0)
Alignment =
TLI.getTargetData()->getPreferredTypeAlignmentShift(C->getType());
unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
ID.AddInteger(Alignment);
ID.AddInteger(Offset);
C->AddSelectionDAGCSEId(ID);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<ConstantPoolSDNode>();
new (N) ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0);
ID.AddPointer(MBB);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<BasicBlockSDNode>();
new (N) BasicBlockSDNode(MBB);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getArgFlags(ISD::ArgFlagsTy Flags) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::ARG_FLAGS, getVTList(MVT::Other), 0, 0);
ID.AddInteger(Flags.getRawBits());
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<ARG_FLAGSSDNode>();
new (N) ARG_FLAGSSDNode(Flags);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getValueType(MVT VT) {
if (VT.isSimple() && (unsigned)VT.getSimpleVT() >= ValueTypeNodes.size())
ValueTypeNodes.resize(VT.getSimpleVT()+1);
SDNode *&N = VT.isExtended() ?
ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT()];
if (N) return SDValue(N, 0);
N = NodeAllocator.Allocate<VTSDNode>();
new (N) VTSDNode(VT);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getExternalSymbol(const char *Sym, MVT VT) {
SDNode *&N = ExternalSymbols[Sym];
if (N) return SDValue(N, 0);
N = NodeAllocator.Allocate<ExternalSymbolSDNode>();
new (N) ExternalSymbolSDNode(false, Sym, VT);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, MVT VT) {
SDNode *&N = TargetExternalSymbols[Sym];
if (N) return SDValue(N, 0);
N = NodeAllocator.Allocate<ExternalSymbolSDNode>();
new (N) ExternalSymbolSDNode(true, Sym, VT);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
if ((unsigned)Cond >= CondCodeNodes.size())
CondCodeNodes.resize(Cond+1);
if (CondCodeNodes[Cond] == 0) {
CondCodeSDNode *N = NodeAllocator.Allocate<CondCodeSDNode>();
new (N) CondCodeSDNode(Cond);
CondCodeNodes[Cond] = N;
AllNodes.push_back(N);
}
return SDValue(CondCodeNodes[Cond], 0);
}
SDValue SelectionDAG::getConvertRndSat(MVT VT, SDValue Val, SDValue DTy,
SDValue STy, SDValue Rnd, SDValue Sat,
ISD::CvtCode Code) {
// If the src and dest types are the same, no conversion is necessary.
if (DTy == STy)
return Val;
FoldingSetNodeID ID;
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
CvtRndSatSDNode *N = NodeAllocator.Allocate<CvtRndSatSDNode>();
SDValue Ops[] = { Val, DTy, STy, Rnd, Sat };
new (N) CvtRndSatSDNode(VT, Ops, 5, Code);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getRegister(unsigned RegNo, MVT VT) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0);
ID.AddInteger(RegNo);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<RegisterSDNode>();
new (N) RegisterSDNode(RegNo, VT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getDbgStopPoint(SDValue Root,
unsigned Line, unsigned Col,
Value *CU) {
SDNode *N = NodeAllocator.Allocate<DbgStopPointSDNode>();
new (N) DbgStopPointSDNode(Root, Line, Col, CU);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getLabel(unsigned Opcode,
SDValue Root,
unsigned LabelID) {
FoldingSetNodeID ID;
SDValue Ops[] = { Root };
AddNodeIDNode(ID, Opcode, getVTList(MVT::Other), &Ops[0], 1);
ID.AddInteger(LabelID);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<LabelSDNode>();
new (N) LabelSDNode(Opcode, Root, LabelID);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue 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), 0, 0);
ID.AddPointer(V);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<SrcValueSDNode>();
new (N) SrcValueSDNode(V);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getMemOperand(const MachineMemOperand &MO) {
#ifndef NDEBUG
const Value *v = MO.getValue();
assert((!v || isa<PointerType>(v->getType())) &&
"SrcValue is not a pointer?");
#endif
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::MEMOPERAND, getVTList(MVT::Other), 0, 0);
MO.Profile(ID);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<MemOperandSDNode>();
new (N) MemOperandSDNode(MO);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
/// CreateStackTemporary - Create a stack temporary, suitable for holding the
/// specified value type.
SDValue SelectionDAG::CreateStackTemporary(MVT VT, unsigned minAlign) {
MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
unsigned ByteSize = VT.getStoreSizeInBits()/8;
const Type *Ty = VT.getTypeForMVT();
unsigned StackAlign =
std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), minAlign);
int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign);
return getFrameIndex(FrameIdx, TLI.getPointerTy());
}
/// CreateStackTemporary - Create a stack temporary suitable for holding
/// either of the specified value types.
SDValue SelectionDAG::CreateStackTemporary(MVT VT1, MVT VT2) {
unsigned Bytes = std::max(VT1.getStoreSizeInBits(),
VT2.getStoreSizeInBits())/8;
const Type *Ty1 = VT1.getTypeForMVT();
const Type *Ty2 = VT2.getTypeForMVT();
const TargetData *TD = TLI.getTargetData();
unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1),
TD->getPrefTypeAlignment(Ty2));
MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align);
return getFrameIndex(FrameIdx, TLI.getPointerTy());
}
SDValue SelectionDAG::FoldSetCC(MVT VT, SDValue N1,
SDValue 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(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
break;
}
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) {
const APInt &C2 = N2C->getAPIntValue();
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
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.getNode())) {
if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) {
// No compile time operations on this type yet.
if (N1C->getValueType(0) == MVT::ppcf128)
return SDValue();
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 SDValue();
}
/// 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(SDValue 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(SDValue 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(SDValue Op, const APInt &Mask,
APInt &KnownZero, APInt &KnownOne,
unsigned Depth) const {
unsigned BitWidth = Mask.getBitWidth();
assert(BitWidth == Op.getValueType().getSizeInBits() &&
"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::SADDO:
case ISD::UADDO:
case ISD::SSUBO:
case ISD::USUBO:
case ISD::SMULO:
case ISD::UMULO:
if (Op.getResNo() != 1)
return;
// The boolean result conforms to getBooleanContents. Fall through.
case ISD::SETCC:
// If we know the result of a setcc has the top bits zero, use this info.
if (TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent &&
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->getZExtValue();
// 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->getZExtValue();
// 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->getZExtValue();
// 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 EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
unsigned EBits = EVT.getSizeInBits();
// 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.clear();
return;
}
case ISD::LOAD: {
if (ISD::isZEXTLoad(Op.getNode())) {
LoadSDNode *LD = cast<LoadSDNode>(Op);
MVT VT = LD->getMemoryVT();
unsigned MemBits = VT.getSizeInBits();
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
}
return;
}
case ISD::ZERO_EXTEND: {
MVT InVT = Op.getOperand(0).getValueType();
unsigned InBits = InVT.getSizeInBits();
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 InVT = Op.getOperand(0).getValueType();
unsigned InBits = InVT.getSizeInBits();
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 InVT = Op.getOperand(0).getValueType();
unsigned InBits = InVT.getSizeInBits();
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 InVT = Op.getOperand(0).getValueType();
unsigned InBits = InVT.getSizeInBits();
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 VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
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))) {
const 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);
// If the sign bit of the first operand is zero, the sign bit of
// the result is zero. If the first operand has no one bits below
// the second operand's single 1 bit, its sign will be zero.
if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
KnownZero2 |= ~LowBits;
KnownZero |= KnownZero2 & 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))) {
const 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(SDValue Op, unsigned Depth) const{
MVT VT = Op.getValueType();
assert(VT.isInteger() && "Invalid VT!");
unsigned VTBits = VT.getSizeInBits();
unsigned Tmp, Tmp2;
unsigned FirstAnswer = 1;
if (Depth == 6)
return 1; // Limit search depth.
switch (Op.getOpcode()) {
default: break;
case ISD::AssertSext:
Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
return VTBits-Tmp+1;
case ISD::AssertZext:
Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
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-Op.getOperand(0).getValueType().getSizeInBits();
return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
case ISD::SIGN_EXTEND_INREG:
// Max of the input and what this extends.
Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
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->getZExtValue();
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->getZExtValue() >= VTBits || // Bad shift.
C->getZExtValue() >= Tmp) break; // Shifted all sign bits out.
return Tmp - C->getZExtValue();
}
break;
case ISD::AND:
case ISD::OR:
case ISD::XOR: // NOT is handled here.
// Logical binary ops preserve the number of sign bits at the worst.
Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
if (Tmp != 1) {
Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
FirstAnswer = std::min(Tmp, Tmp2);
// We computed what we know about the sign bits as our first
// answer. Now proceed to the generic code that uses
// ComputeMaskedBits, and pick whichever answer is better.
}
break;
case ISD::SELECT:
Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
if (Tmp == 1) return 1; // Early out.
Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
return std::min(Tmp, Tmp2);
case ISD::SADDO:
case ISD::UADDO:
case ISD::SSUBO:
case ISD::USUBO:
case ISD::SMULO:
case ISD::UMULO:
if (Op.getResNo() != 1)
break;
// The boolean result conforms to getBooleanContents. Fall through.
case ISD::SETCC:
// If setcc returns 0/-1, all bits are sign bits.
if (TLI.getBooleanContents() ==
TargetLowering::ZeroOrNegativeOneBooleanContent)
return VTBits;
break;
case ISD::ROTL:
case ISD::ROTR:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned RotAmt = C->getZExtValue() & (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 = LD->getMemoryVT().getSizeInBits();
return VTBits-Tmp+1;
case ISD::ZEXTLOAD: // '16' bits known
Tmp = LD->getMemoryVT().getSizeInBits();
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) FirstAnswer = std::max(FirstAnswer, 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 FirstAnswer;
}
// 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::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
}
bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const {
GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
if (!GA) return false;
if (GA->getOffset() != 0) return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
if (!GV) return false;
MachineModuleInfo *MMI = getMachineModuleInfo();
return MMI && MMI->hasDebugInfo();
}
/// getShuffleScalarElt - Returns the scalar element that will make up the ith
/// element of the result of the vector shuffle.
SDValue SelectionDAG::getShuffleScalarElt(const SDNode *N, unsigned i) {
MVT VT = N->getValueType(0);
SDValue PermMask = N->getOperand(2);
SDValue Idx = PermMask.getOperand(i);
if (Idx.getOpcode() == ISD::UNDEF)
return getNode(ISD::UNDEF, VT.getVectorElementType());
unsigned Index = cast<ConstantSDNode>(Idx)->getZExtValue();
unsigned NumElems = PermMask.getNumOperands();
SDValue V = (Index < NumElems) ? N->getOperand(0) : N->getOperand(1);
Index %= NumElems;
if (V.getOpcode() == ISD::BIT_CONVERT) {
V = V.getOperand(0);
MVT VVT = V.getValueType();
if (!VVT.isVector() || VVT.getVectorNumElements() != NumElems)
return SDValue();
}
if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
return (Index == 0) ? V.getOperand(0)
: getNode(ISD::UNDEF, VT.getVectorElementType());
if (V.getOpcode() == ISD::BUILD_VECTOR)
return V.getOperand(Index);
if (V.getOpcode() == ISD::VECTOR_SHUFFLE)
return getShuffleScalarElt(V.getNode(), Index);
return SDValue();
}
/// getNode - Gets or creates the specified node.
///
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<SDNode>();
new (N) SDNode(Opcode, SDNode::getSDVTList(VT));
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, SDValue Operand) {
// Constant fold unary operations with an integer constant operand.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
const APInt &Val = C->getAPIntValue();
unsigned BitWidth = VT.getSizeInBits();
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.getNode())) {
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: {
bool ignored;
// 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, &ignored);
return getConstantFP(V, VT);
}
case ISD::FP_TO_SINT:
case ISD::FP_TO_UINT: {
integerPart x;
bool ignored;
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, &ignored);
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.bitcastToAPInt().getZExtValue(), VT);
else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
return getConstant(V.bitcastToAPInt().getZExtValue(), VT);
break;
}
}
}
unsigned OpOpcode = Operand.getNode()->getOpcode();
switch (Opcode) {
case ISD::TokenFactor:
case ISD::MERGE_VALUES:
case ISD::CONCAT_VECTORS:
return Operand; // Factor, merge or concat of one node? No need.
case ISD::FP_ROUND: assert(0 && "Invalid method to make FP_ROUND node");
case ISD::FP_EXTEND:
assert(VT.isFloatingPoint() &&
Operand.getValueType().isFloatingPoint() && "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(VT.isInteger() && Operand.getValueType().isInteger() &&
"Invalid SIGN_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(Operand.getValueType().bitsLT(VT)
&& "Invalid sext node, dst < src!");
if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
return getNode(OpOpcode, VT, Operand.getNode()->getOperand(0));
break;
case ISD::ZERO_EXTEND:
assert(VT.isInteger() && Operand.getValueType().isInteger() &&
"Invalid ZERO_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(Operand.getValueType().bitsLT(VT)
&& "Invalid zext node, dst < src!");
if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
return getNode(ISD::ZERO_EXTEND, VT, Operand.getNode()->getOperand(0));
break;
case ISD::ANY_EXTEND:
assert(VT.isInteger() && Operand.getValueType().isInteger() &&
"Invalid ANY_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension
assert(Operand.getValueType().bitsLT(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.getNode()->getOperand(0));
break;
case ISD::TRUNCATE:
assert(VT.isInteger() && Operand.getValueType().isInteger() &&
"Invalid TRUNCATE!");
if (Operand.getValueType() == VT) return Operand; // noop truncate
assert(Operand.getValueType().bitsGT(VT)
&& "Invalid truncate node, src < dst!");
if (OpOpcode == ISD::TRUNCATE)
return getNode(ISD::TRUNCATE, VT, Operand.getNode()->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 (Operand.getNode()->getOperand(0).getValueType().bitsLT(VT))
return getNode(OpOpcode, VT, Operand.getNode()->getOperand(0));
else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
return getNode(ISD::TRUNCATE, VT, Operand.getNode()->getOperand(0));
else
return Operand.getNode()->getOperand(0);
}
break;
case ISD::BIT_CONVERT:
// Basic sanity checking.
assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
&& "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(VT.isVector() && !Operand.getValueType().isVector() &&
VT.getVectorElementType() == 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.getNode()->getOperand(1),
Operand.getNode()->getOperand(0));
if (OpOpcode == ISD::FNEG) // --X -> X
return Operand.getNode()->getOperand(0);
break;
case ISD::FABS:
if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
return getNode(ISD::FABS, VT, Operand.getNode()->getOperand(0));
break;
}
SDNode *N;
SDVTList VTs = getVTList(VT);
if (VT != MVT::Flag) { // Don't CSE flag producing nodes
FoldingSetNodeID ID;
SDValue Ops[1] = { Operand };
AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
N = NodeAllocator.Allocate<UnarySDNode>();
new (N) UnarySDNode(Opcode, VTs, Operand);
CSEMap.InsertNode(N, IP);
} else {
N = NodeAllocator.Allocate<UnarySDNode>();
new (N) UnarySDNode(Opcode, VTs, Operand);
}
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode,
MVT VT,
ConstantSDNode *Cst1,
ConstantSDNode *Cst2) {
const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->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;
}
return SDValue();
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
SDValue N1, SDValue N2) {
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
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;
if (N1 == N2) return N1;
break;
case ISD::CONCAT_VECTORS:
// A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
// one big BUILD_VECTOR.
if (N1.getOpcode() == ISD::BUILD_VECTOR &&
N2.getOpcode() == ISD::BUILD_VECTOR) {
SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end());
Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end());
return getNode(ISD::BUILD_VECTOR, VT, &Elts[0], Elts.size());
}
break;
case ISD::AND:
assert(VT.isInteger() && 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:
case ISD::ADD:
case ISD::SUB:
assert(VT.isInteger() && 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(VT.isInteger() && "This operator does not apply to FP types!");
// fall through
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 &&
N1.getValueType().isFloatingPoint() &&
N2.getValueType().isFloatingPoint() &&
"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(VT.isInteger() && N2.getValueType().isInteger() &&
"Shifts only work on integers");
assert((N2.getValueType() == TLI.getShiftAmountTy() ||
(N2.getValueType().isVector() && N2.getValueType().isInteger())) &&
"Wrong type for shift amount");
// Always fold shifts of i1 values so the code generator doesn't need to
// handle them. Since we know the size of the shift has to be less than the
// size of the value, the shift/rotate count is guaranteed to be zero.
if (VT == MVT::i1)
return N1;
break;
case ISD::FP_ROUND_INREG: {
MVT EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg round!");
assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
"Cannot FP_ROUND_INREG integer types");
assert(EVT.bitsLE(VT) && "Not rounding down!");
if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
break;
}
case ISD::FP_ROUND:
assert(VT.isFloatingPoint() &&
N1.getValueType().isFloatingPoint() &&
VT.bitsLE(N1.getValueType()) &&
isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
if (N1.getValueType() == VT) return N1; // noop conversion.
break;
case ISD::AssertSext:
case ISD::AssertZext: {
MVT EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg extend!");
assert(VT.isInteger() && EVT.isInteger() &&
"Cannot *_EXTEND_INREG FP types");
assert(EVT.bitsLE(VT) && "Not extending!");
if (VT == EVT) return N1; // noop assertion.
break;
}
case ISD::SIGN_EXTEND_INREG: {
MVT EVT = cast<VTSDNode>(N2)->getVT();
assert(VT == N1.getValueType() && "Not an inreg extend!");
assert(VT.isInteger() && EVT.isInteger() &&
"Cannot *_EXTEND_INREG FP types");
assert(EVT.bitsLE(VT) && "Not extending!");
if (EVT == VT) return N1; // Not actually extending
if (N1C) {
APInt Val = N1C->getAPIntValue();
unsigned FromBits = cast<VTSDNode>(N2)->getVT().getSizeInBits();
Val <<= Val.getBitWidth()-FromBits;
Val = Val.ashr(Val.getBitWidth()-FromBits);
return getConstant(Val, VT);
}
break;
}
case ISD::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 (N2C &&
N1.getOpcode() == ISD::CONCAT_VECTORS &&
N1.getNumOperands() > 0) {
unsigned Factor =
N1.getOperand(0).getValueType().getVectorNumElements();
return getNode(ISD::EXTRACT_VECTOR_ELT, VT,
N1.getOperand(N2C->getZExtValue() / Factor),
getConstant(N2C->getZExtValue() % Factor,
N2.getValueType()));
}
// EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
// expanding large vector constants.
if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR)
return N1.getOperand(N2C->getZExtValue());
// 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 (N1.getOperand(2) == N2)
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->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");
assert(!N1.getValueType().isVector() && !VT.isVector() &&
(N1.getValueType().isInteger() == VT.isInteger()) &&
"Wrong types for EXTRACT_ELEMENT!");
// 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->getZExtValue());
// EXTRACT_ELEMENT of a constant int is also very common.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
unsigned ElementSize = VT.getSizeInBits();
unsigned Shift = ElementSize * N2C->getZExtValue();
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) {
SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C);
if (SV.getNode()) return SV;
} 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.getNode());
ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode());
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 (!VT.isVector())
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 (!VT.isVector())
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 (!VT.isVector())
return getConstant(VT.getIntegerVTBitMask(), 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) {
SDValue Ops[] = { N1, N2 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
N = NodeAllocator.Allocate<BinarySDNode>();
new (N) BinarySDNode(Opcode, VTs, N1, N2);
CSEMap.InsertNode(N, IP);
} else {
N = NodeAllocator.Allocate<BinarySDNode>();
new (N) BinarySDNode(Opcode, VTs, N1, N2);
}
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
SDValue N1, SDValue N2, SDValue N3) {
// Perform various simplifications.
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
switch (Opcode) {
case ISD::CONCAT_VECTORS:
// A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
// one big BUILD_VECTOR.
if (N1.getOpcode() == ISD::BUILD_VECTOR &&
N2.getOpcode() == ISD::BUILD_VECTOR &&
N3.getOpcode() == ISD::BUILD_VECTOR) {
SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end());
Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end());
Elts.insert(Elts.end(), N3.getNode()->op_begin(), N3.getNode()->op_end());
return getNode(ISD::BUILD_VECTOR, VT, &Elts[0], Elts.size());
}
break;
case ISD::SETCC: {
// Use FoldSetCC to simplify SETCC's.
SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get());
if (Simp.getNode()) return Simp;
break;
}
case ISD::SELECT:
if (N1C) {
if (N1C->getZExtValue())
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->getZExtValue()) // Unconditional branch
return getNode(ISD::BR, MVT::Other, N1, N3);
else
return N1; // Never-taken branch
}
break;
case ISD::VECTOR_SHUFFLE:
assert(N1.getValueType() == N2.getValueType() &&
N1.getValueType().isVector() &&
VT.isVector() && N3.getValueType().isVector() &&
N3.getOpcode() == ISD::BUILD_VECTOR &&
VT.getVectorNumElements() == 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) {
SDValue Ops[] = { N1, N2, N3 };
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
N = NodeAllocator.Allocate<TernarySDNode>();
new (N) TernarySDNode(Opcode, VTs, N1, N2, N3);
CSEMap.InsertNode(N, IP);
} else {
N = NodeAllocator.Allocate<TernarySDNode>();
new (N) TernarySDNode(Opcode, VTs, N1, N2, N3);
}
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
SDValue N1, SDValue N2, SDValue N3,
SDValue N4) {
SDValue Ops[] = { N1, N2, N3, N4 };
return getNode(Opcode, VT, Ops, 4);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
SDValue N1, SDValue N2, SDValue N3,
SDValue N4, SDValue N5) {
SDValue Ops[] = { N1, N2, N3, N4, N5 };
return getNode(Opcode, VT, Ops, 5);
}
/// getMemsetValue - Vectorized representation of the memset value
/// operand.
static SDValue getMemsetValue(SDValue Value, MVT VT, SelectionDAG &DAG) {
unsigned NumBits = VT.isVector() ?
VT.getVectorElementType().getSizeInBits() : VT.getSizeInBits();
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
APInt Val = APInt(NumBits, C->getZExtValue() & 255);
unsigned Shift = 8;
for (unsigned i = NumBits; i > 8; i >>= 1) {
Val = (Val << Shift) | Val;
Shift <<= 1;
}
if (VT.isInteger())
return DAG.getConstant(Val, VT);
return DAG.getConstantFP(APFloat(Val), VT);
}
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
Value = DAG.getNode(ISD::ZERO_EXTEND, VT, Value);
unsigned Shift = 8;
for (unsigned i = NumBits; i > 8; i >>= 1) {
Value = DAG.getNode(ISD::OR, VT,
DAG.getNode(ISD::SHL, VT, Value,
DAG.getConstant(Shift,
TLI.getShiftAmountTy())),
Value);
Shift <<= 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 SDValue getMemsetStringVal(MVT VT, SelectionDAG &DAG,
const TargetLowering &TLI,
std::string &Str, unsigned Offset) {
// Handle vector with all elements zero.
if (Str.empty()) {
if (VT.isInteger())
return DAG.getConstant(0, VT);
unsigned NumElts = VT.getVectorNumElements();
MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
return DAG.getNode(ISD::BIT_CONVERT, VT,
DAG.getConstant(0, MVT::getVectorVT(EltVT, NumElts)));
}
assert(!VT.isVector() && "Can't handle vector type here!");
unsigned NumBits = VT.getSizeInBits();
unsigned MSB = NumBits / 8;
uint64_t Val = 0;
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 SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
SelectionDAG &DAG) {
MVT VT = Base.getValueType();
return DAG.getNode(ISD::ADD, VT, Base, DAG.getConstant(Offset, VT));
}
/// isMemSrcFromString - Returns true if memcpy source is a string constant.
///
static bool isMemSrcFromString(SDValue Src, std::string &Str) {
unsigned SrcDelta = 0;
GlobalAddressSDNode *G = NULL;
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))->getZExtValue();
}
if (!G)
return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
return true;
return false;
}
/// 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> &MemOps,
SDValue Dst, SDValue Src,
unsigned Limit, uint64_t Size, unsigned &Align,
std::string &Str, bool &isSrcStr,
SelectionDAG &DAG,
const TargetLowering &TLI) {
isSrcStr = isMemSrcFromString(Src, Str);
bool isSrcConst = isa<ConstantSDNode>(Src);
bool AllowUnalign = TLI.allowsUnalignedMemoryAccesses();
MVT VT = TLI.getOptimalMemOpType(Size, Align, isSrcConst, isSrcStr);
if (VT != MVT::iAny) {
unsigned NewAlign = (unsigned)
TLI.getTargetData()->getABITypeAlignment(VT.getTypeForMVT());
// If source is a string constant, this will require an unaligned load.
if (NewAlign > Align && (isSrcConst || AllowUnalign)) {
if (Dst.getOpcode() != ISD::FrameIndex) {
// Can't change destination alignment. It requires a unaligned store.
if (AllowUnalign)
VT = MVT::iAny;
} else {
int FI = cast<FrameIndexSDNode>(Dst)->getIndex();
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
if (MFI->isFixedObjectIndex(FI)) {
// Can't change destination alignment. It requires a unaligned store.
if (AllowUnalign)
VT = MVT::iAny;
} else {
// Give the stack frame object a larger alignment if needed.
if (MFI->getObjectAlignment(FI) < NewAlign)
MFI->setObjectAlignment(FI, NewAlign);
Align = NewAlign;
}
}
}
}
if (VT == MVT::iAny) {
if (AllowUnalign) {
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 LVT = MVT::i64;
while (!TLI.isTypeLegal(LVT))
LVT = (MVT::SimpleValueType)(LVT.getSimpleVT() - 1);
assert(LVT.isInteger());
if (VT.bitsGT(LVT))
VT = LVT;
}
unsigned NumMemOps = 0;
while (Size != 0) {
unsigned VTSize = VT.getSizeInBits() / 8;
while (VTSize > Size) {
// For now, only use non-vector load / store's for the left-over pieces.
if (VT.isVector()) {
VT = MVT::i64;
while (!TLI.isTypeLegal(VT))
VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
VTSize = VT.getSizeInBits() / 8;
} else {
VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
VTSize >>= 1;
}
}
if (++NumMemOps > Limit)
return false;
MemOps.push_back(VT);
Size -= VTSize;
}
return true;
}
static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG,
SDValue Chain, SDValue Dst,
SDValue 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 load and store ops if the size operand falls
// below a certain threshold.
std::vector<MVT> MemOps;
uint64_t Limit = -1ULL;
if (!AlwaysInline)
Limit = TLI.getMaxStoresPerMemcpy();
unsigned DstAlign = Align; // Destination alignment can change.
std::string Str;
bool CopyFromStr;
if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign,
Str, CopyFromStr, DAG, TLI))
return SDValue();
bool isZeroStr = CopyFromStr && Str.empty();
SmallVector<SDValue, 8> OutChains;
unsigned NumMemOps = MemOps.size();
uint64_t SrcOff = 0, DstOff = 0;
for (unsigned i = 0; i < NumMemOps; i++) {
MVT VT = MemOps[i];
unsigned VTSize = VT.getSizeInBits() / 8;
SDValue Value, Store;
if (CopyFromStr && (isZeroStr || !VT.isVector())) {
// It's unlikely a store of a vector immediate can be done in a single
// instruction. It would require a load from a constantpool first.
// We also handle store a vector with all zero's.
// FIXME: Handle other cases where store of vector immediate is done in
// a single instruction.
Value = getMemsetStringVal(VT, DAG, TLI, Str, SrcOff);
Store = DAG.getStore(Chain, Value,
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, DstAlign);
} 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, DstAlign);
}
OutChains.push_back(Store);
SrcOff += VTSize;
DstOff += VTSize;
}
return DAG.getNode(ISD::TokenFactor, MVT::Other,
&OutChains[0], OutChains.size());
}
static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG,
SDValue Chain, SDValue Dst,
SDValue 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 memmove to a series of load and store ops if the size operand falls
// below a certain threshold.
std::vector<MVT> MemOps;
uint64_t Limit = -1ULL;
if (!AlwaysInline)
Limit = TLI.getMaxStoresPerMemmove();
unsigned DstAlign = Align; // Destination alignment can change.
std::string Str;
bool CopyFromStr;
if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign,
Str, CopyFromStr, DAG, TLI))
return SDValue();
uint64_t SrcOff = 0, DstOff = 0;
SmallVector<SDValue, 8> LoadValues;
SmallVector<SDValue, 8> LoadChains;
SmallVector<SDValue, 8> OutChains;
unsigned NumMemOps = MemOps.size();
for (unsigned i = 0; i < NumMemOps; i++) {
MVT VT = MemOps[i];
unsigned VTSize = VT.getSizeInBits() / 8;
SDValue Value, Store;
Value = DAG.getLoad(VT, Chain,
getMemBasePlusOffset(Src, SrcOff, DAG),
SrcSV, SrcSVOff + SrcOff, false, Align);
LoadValues.push_back(Value);
LoadChains.push_back(Value.getValue(1));
SrcOff += VTSize;
}
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
&LoadChains[0], LoadChains.size());
OutChains.clear();
for (unsigned i = 0; i < NumMemOps; i++) {
MVT VT = MemOps[i];
unsigned VTSize = VT.getSizeInBits() / 8;
SDValue Value, Store;
Store = DAG.getStore(Chain, LoadValues[i],
getMemBasePlusOffset(Dst, DstOff, DAG),
DstSV, DstSVOff + DstOff, false, DstAlign);
OutChains.push_back(Store);
DstOff += VTSize;
}
return DAG.getNode(ISD::TokenFactor, MVT::Other,
&OutChains[0], OutChains.size());
}
static SDValue getMemsetStores(SelectionDAG &DAG,
SDValue Chain, SDValue Dst,
SDValue 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> MemOps;
std::string Str;
bool CopyFromStr;
if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, TLI.getMaxStoresPerMemset(),
Size, Align, Str, CopyFromStr, DAG, TLI))
return SDValue();
SmallVector<SDValue, 8> OutChains;
uint64_t DstOff = 0;
unsigned NumMemOps = MemOps.size();
for (unsigned i = 0; i < NumMemOps; i++) {
MVT VT = MemOps[i];
unsigned VTSize = VT.getSizeInBits() / 8;
SDValue Value = getMemsetValue(Src, VT, DAG);
SDValue 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());
}
SDValue SelectionDAG::getMemcpy(SDValue Chain, SDValue Dst,
SDValue Src, SDValue 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;
SDValue Result =
getMemcpyLoadsAndStores(*this, Chain, Dst, Src,
ConstantSize->getZExtValue(),
Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.getNode())
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.
SDValue Result =
TLI.EmitTargetCodeForMemcpy(*this, Chain, Dst, Src, Size, Align,
AlwaysInline,
DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.getNode())
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->getZExtValue(), 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<SDValue,SDValue> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, false, CallingConv::C, false,
getExternalSymbol("memcpy", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDValue SelectionDAG::getMemmove(SDValue Chain, SDValue Dst,
SDValue Src, SDValue Size,
unsigned Align,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff) {
// Check to see if we should lower the memmove 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) {
// Memmove with size zero? Just return the original chain.
if (ConstantSize->isNullValue())
return Chain;
SDValue Result =
getMemmoveLoadsAndStores(*this, Chain, Dst, Src,
ConstantSize->getZExtValue(),
Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.getNode())
return Result;
}
// 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.
SDValue Result =
TLI.EmitTargetCodeForMemmove(*this, Chain, Dst, Src, Size, Align,
DstSV, DstSVOff, SrcSV, SrcSVOff);
if (Result.getNode())
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<SDValue,SDValue> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, false, CallingConv::C, false,
getExternalSymbol("memmove", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDValue SelectionDAG::getMemset(SDValue Chain, SDValue Dst,
SDValue Src, SDValue 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;
SDValue Result =
getMemsetStores(*this, Chain, Dst, Src, ConstantSize->getZExtValue(),
Align, DstSV, DstSVOff);
if (Result.getNode())
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.
SDValue Result =
TLI.EmitTargetCodeForMemset(*this, Chain, Dst, Src, Size, Align,
DstSV, DstSVOff);
if (Result.getNode())
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().bitsGT(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<SDValue,SDValue> CallResult =
TLI.LowerCallTo(Chain, Type::VoidTy,
false, false, false, false, CallingConv::C, false,
getExternalSymbol("memset", TLI.getPointerTy()),
Args, *this);
return CallResult.second;
}
SDValue SelectionDAG::getAtomic(unsigned Opcode, MVT MemVT,
SDValue Chain,
SDValue Ptr, SDValue Cmp,
SDValue Swp, const Value* PtrVal,
unsigned Alignment) {
assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
MVT VT = Cmp.getValueType();
if (Alignment == 0) // Ensure that codegen never sees alignment 0
Alignment = getMVTAlignment(MemVT);
SDVTList VTs = getVTList(VT, MVT::Other);
FoldingSetNodeID ID;
SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode* N = NodeAllocator.Allocate<AtomicSDNode>();
new (N) AtomicSDNode(Opcode, VTs, MemVT,
Chain, Ptr, Cmp, Swp, PtrVal, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getAtomic(unsigned Opcode, MVT MemVT,
SDValue Chain,
SDValue Ptr, SDValue Val,
const Value* PtrVal,
unsigned Alignment) {
assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
Opcode == ISD::ATOMIC_LOAD_SUB ||
Opcode == ISD::ATOMIC_LOAD_AND ||
Opcode == ISD::ATOMIC_LOAD_OR ||
Opcode == ISD::ATOMIC_LOAD_XOR ||
Opcode == ISD::ATOMIC_LOAD_NAND ||
Opcode == ISD::ATOMIC_LOAD_MIN ||
Opcode == ISD::ATOMIC_LOAD_MAX ||
Opcode == ISD::ATOMIC_LOAD_UMIN ||
Opcode == ISD::ATOMIC_LOAD_UMAX ||
Opcode == ISD::ATOMIC_SWAP) &&
"Invalid Atomic Op");
MVT VT = Val.getValueType();
if (Alignment == 0) // Ensure that codegen never sees alignment 0
Alignment = getMVTAlignment(MemVT);
SDVTList VTs = getVTList(VT, MVT::Other);
FoldingSetNodeID ID;
SDValue Ops[] = {Chain, Ptr, Val};
AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode* N = NodeAllocator.Allocate<AtomicSDNode>();
new (N) AtomicSDNode(Opcode, VTs, MemVT,
Chain, Ptr, Val, PtrVal, Alignment);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
/// getMergeValues - Create a MERGE_VALUES node from the given operands.
/// Allowed to return something different (and simpler) if Simplify is true.
SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps) {
if (NumOps == 1)
return Ops[0];
SmallVector<MVT, 4> VTs;
VTs.reserve(NumOps);
for (unsigned i = 0; i < NumOps; ++i)
VTs.push_back(Ops[i].getValueType());
return getNode(ISD::MERGE_VALUES, getVTList(&VTs[0], NumOps), Ops, NumOps);
}
SDValue
SelectionDAG::getMemIntrinsicNode(unsigned Opcode,
const MVT *VTs, unsigned NumVTs,
const SDValue *Ops, unsigned NumOps,
MVT MemVT, const Value *srcValue, int SVOff,
unsigned Align, bool Vol,
bool ReadMem, bool WriteMem) {
return getMemIntrinsicNode(Opcode, makeVTList(VTs, NumVTs), Ops, NumOps,
MemVT, srcValue, SVOff, Align, Vol,
ReadMem, WriteMem);
}
SDValue
SelectionDAG::getMemIntrinsicNode(unsigned Opcode, SDVTList VTList,
const SDValue *Ops, unsigned NumOps,
MVT MemVT, const Value *srcValue, int SVOff,
unsigned Align, bool Vol,
bool ReadMem, bool WriteMem) {
// Memoize the node unless it returns a flag.
MemIntrinsicSDNode *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 SDValue(E, 0);
N = NodeAllocator.Allocate<MemIntrinsicSDNode>();
new (N) MemIntrinsicSDNode(Opcode, VTList, Ops, NumOps, MemVT,
srcValue, SVOff, Align, Vol, ReadMem, WriteMem);
CSEMap.InsertNode(N, IP);
} else {
N = NodeAllocator.Allocate<MemIntrinsicSDNode>();
new (N) MemIntrinsicSDNode(Opcode, VTList, Ops, NumOps, MemVT,
srcValue, SVOff, Align, Vol, ReadMem, WriteMem);
}
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue
SelectionDAG::getCall(unsigned CallingConv, bool IsVarArgs, bool IsTailCall,
bool IsInreg, SDVTList VTs,
const SDValue *Operands, unsigned NumOperands) {
// Do not include isTailCall in the folding set profile.
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::CALL, VTs, Operands, NumOperands);
ID.AddInteger(CallingConv);
ID.AddInteger(IsVarArgs);
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
// Instead of including isTailCall in the folding set, we just
// set the flag of the existing node.
if (!IsTailCall)
cast<CallSDNode>(E)->setNotTailCall();
return SDValue(E, 0);
}
SDNode *N = NodeAllocator.Allocate<CallSDNode>();
new (N) CallSDNode(CallingConv, IsVarArgs, IsTailCall, IsInreg,
VTs, Operands, NumOperands);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue
SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
MVT VT, SDValue Chain,
SDValue Ptr, SDValue Offset,
const Value *SV, int SVOffset, MVT EVT,
bool isVolatile, unsigned Alignment) {
if (Alignment == 0) // Ensure that codegen never sees alignment 0
Alignment = getMVTAlignment(VT);
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 (VT.isVector())
assert(EVT.getVectorNumElements() == VT.getVectorNumElements() &&
"Invalid vector extload!");
else
assert(EVT.bitsLT(VT) &&
"Should only be an extending load, not truncating!");
assert((ExtType == ISD::EXTLOAD || VT.isInteger()) &&
"Cannot sign/zero extend a FP/Vector load!");
assert(VT.isInteger() == EVT.isInteger() &&
"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);
SDValue Ops[] = { Chain, Ptr, Offset };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
ID.AddInteger(AM);
ID.AddInteger(ExtType);
ID.AddInteger(EVT.getRawBits());
ID.AddInteger(encodeMemSDNodeFlags(isVolatile, Alignment));
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<LoadSDNode>();
new (N) LoadSDNode(Ops, VTs, AM, ExtType, EVT, SV, SVOffset,
Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getLoad(MVT VT,
SDValue Chain, SDValue Ptr,
const Value *SV, int SVOffset,
bool isVolatile, unsigned Alignment) {
SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType());
return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef,
SV, SVOffset, VT, isVolatile, Alignment);
}
SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT VT,
SDValue Chain, SDValue Ptr,
const Value *SV,
int SVOffset, MVT EVT,
bool isVolatile, unsigned Alignment) {
SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType());
return getLoad(ISD::UNINDEXED, ExtType, VT, Chain, Ptr, Undef,
SV, SVOffset, EVT, isVolatile, Alignment);
}
SDValue
SelectionDAG::getIndexedLoad(SDValue OrigLoad, SDValue Base,
SDValue 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());
}
SDValue SelectionDAG::getStore(SDValue Chain, SDValue Val,
SDValue Ptr, const Value *SV, int SVOffset,
bool isVolatile, unsigned Alignment) {
MVT VT = Val.getValueType();
if (Alignment == 0) // Ensure that codegen never sees alignment 0
Alignment = getMVTAlignment(VT);
SDVTList VTs = getVTList(MVT::Other);
SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDValue Ops[] = { Chain, Val, Ptr, Undef };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
ID.AddInteger(ISD::UNINDEXED);
ID.AddInteger(false);
ID.AddInteger(VT.getRawBits());
ID.AddInteger(encodeMemSDNodeFlags(isVolatile, Alignment));
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<StoreSDNode>();
new (N) StoreSDNode(Ops, VTs, ISD::UNINDEXED, false,
VT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue SelectionDAG::getTruncStore(SDValue Chain, SDValue Val,
SDValue Ptr, const Value *SV,
int SVOffset, MVT SVT,
bool isVolatile, unsigned Alignment) {
MVT VT = Val.getValueType();
if (VT == SVT)
return getStore(Chain, Val, Ptr, SV, SVOffset, isVolatile, Alignment);
assert(VT.bitsGT(SVT) && "Not a truncation?");
assert(VT.isInteger() == SVT.isInteger() &&
"Can't do FP-INT conversion!");
if (Alignment == 0) // Ensure that codegen never sees alignment 0
Alignment = getMVTAlignment(VT);
SDVTList VTs = getVTList(MVT::Other);
SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDValue Ops[] = { Chain, Val, Ptr, Undef };
FoldingSetNodeID ID;
AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
ID.AddInteger(ISD::UNINDEXED);
ID.AddInteger(1);
ID.AddInteger(SVT.getRawBits());
ID.AddInteger(encodeMemSDNodeFlags(isVolatile, Alignment));
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<StoreSDNode>();
new (N) StoreSDNode(Ops, VTs, ISD::UNINDEXED, true,
SVT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
return SDValue(N, 0);
}
SDValue
SelectionDAG::getIndexedStore(SDValue OrigStore, SDValue Base,
SDValue 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);
SDValue 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(ST->getMemoryVT().getRawBits());
ID.AddInteger(ST->getRawFlags());
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
SDNode *N = NodeAllocator.Allocate<StoreSDNode>();
new (N) 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 SDValue(N, 0);
}
SDValue SelectionDAG::getVAArg(MVT VT,
SDValue Chain, SDValue Ptr,
SDValue SV) {
SDValue Ops[] = { Chain, Ptr, SV };
return getNode(ISD::VAARG, getVTList(VT, MVT::Other), Ops, 3);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
const SDUse *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;
}
// Copy from an SDUse array into an SDValue array for use with
// the regular getNode logic.
SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps);
return getNode(Opcode, VT, &NewOps[0], NumOps);
}
SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
const SDValue *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 SDValue(E, 0);
N = NodeAllocator.Allocate<SDNode>();
new (N) SDNode(Opcode, VTs, Ops, NumOps);
CSEMap.InsertNode(N, IP);
} else {
N = NodeAllocator.Allocate<SDNode>();
new (N) SDNode(Opcode, VTs, Ops, NumOps);
}
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode,
const std::vector<MVT> &ResultTys,
const SDValue *Ops, unsigned NumOps) {
return getNode(Opcode, getNodeValueTypes(ResultTys), ResultTys.size(),
Ops, NumOps);
}
SDValue SelectionDAG::getNode(unsigned Opcode,
const MVT *VTs, unsigned NumVTs,
const SDValue *Ops, unsigned NumOps) {
if (NumVTs == 1)
return getNode(Opcode, VTs[0], Ops, NumOps);
return getNode(Opcode, makeVTList(VTs, NumVTs), Ops, NumOps);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
const SDValue *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 = VT.getSizeInBits()*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 SDValue(E, 0);
if (NumOps == 1) {
N = NodeAllocator.Allocate<UnarySDNode>();
new (N) UnarySDNode(Opcode, VTList, Ops[0]);
} else if (NumOps == 2) {
N = NodeAllocator.Allocate<BinarySDNode>();
new (N) BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
} else if (NumOps == 3) {
N = NodeAllocator.Allocate<TernarySDNode>();
new (N) TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
} else {
N = NodeAllocator.Allocate<SDNode>();
new (N) SDNode(Opcode, VTList, Ops, NumOps);
}
CSEMap.InsertNode(N, IP);
} else {
if (NumOps == 1) {
N = NodeAllocator.Allocate<UnarySDNode>();
new (N) UnarySDNode(Opcode, VTList, Ops[0]);
} else if (NumOps == 2) {
N = NodeAllocator.Allocate<BinarySDNode>();
new (N) BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
} else if (NumOps == 3) {
N = NodeAllocator.Allocate<TernarySDNode>();
new (N) TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
} else {
N = NodeAllocator.Allocate<SDNode>();
new (N) SDNode(Opcode, VTList, Ops, NumOps);
}
}
AllNodes.push_back(N);
#ifndef NDEBUG
VerifyNode(N);
#endif
return SDValue(N, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList) {
return getNode(Opcode, VTList, 0, 0);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDValue N1) {
SDValue Ops[] = { N1 };
return getNode(Opcode, VTList, Ops, 1);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDValue N1, SDValue N2) {
SDValue Ops[] = { N1, N2 };
return getNode(Opcode, VTList, Ops, 2);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDValue N1, SDValue N2, SDValue N3) {
SDValue Ops[] = { N1, N2, N3 };
return getNode(Opcode, VTList, Ops, 3);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDValue N1, SDValue N2, SDValue N3,
SDValue N4) {
SDValue Ops[] = { N1, N2, N3, N4 };
return getNode(Opcode, VTList, Ops, 4);
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
SDValue N1, SDValue N2, SDValue N3,
SDValue N4, SDValue N5) {
SDValue Ops[] = { N1, N2, N3, N4, N5 };
return getNode(Opcode, VTList, Ops, 5);
}
SDVTList SelectionDAG::getVTList(MVT VT) {
return makeVTList(SDNode::getValueTypeList(VT), 1);
}
SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2) {
for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
E = VTList.rend(); I != E; ++I)
if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2)
return *I;
MVT *Array = Allocator.Allocate<MVT>(2);
Array[0] = VT1;
Array[1] = VT2;
SDVTList Result = makeVTList(Array, 2);
VTList.push_back(Result);
return Result;
}
SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2, MVT VT3) {
for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
E = VTList.rend(); I != E; ++I)
if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
I->VTs[2] == VT3)
return *I;
MVT *Array = Allocator.Allocate<MVT>(3);
Array[0] = VT1;
Array[1] = VT2;
Array[2] = VT3;
SDVTList Result = makeVTList(Array, 3);
VTList.push_back(Result);
return Result;
}
SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2, MVT VT3, MVT VT4) {
for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
E = VTList.rend(); I != E; ++I)
if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
I->VTs[2] == VT3 && I->VTs[3] == VT4)
return *I;
MVT *Array = Allocator.Allocate<MVT>(3);
Array[0] = VT1;
Array[1] = VT2;
Array[2] = VT3;
Array[3] = VT4;
SDVTList Result = makeVTList(Array, 4);
VTList.push_back(Result);
return Result;
}
SDVTList SelectionDAG::getVTList(const MVT *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::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
E = VTList.rend(); I != E; ++I) {
if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1])
continue;
bool NoMatch = false;
for (unsigned i = 2; i != NumVTs; ++i)
if (VTs[i] != I->VTs[i]) {
NoMatch = true;
break;
}
if (!NoMatch)
return *I;
}
MVT *Array = Allocator.Allocate<MVT>(NumVTs);
std::copy(VTs, VTs+NumVTs, Array);
SDVTList Result = makeVTList(Array, NumVTs);
VTList.push_back(Result);
return Result;
}
/// 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.
SDValue SelectionDAG::UpdateNodeOperands(SDValue InN, SDValue Op) {
SDNode *N = InN.getNode();
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 SDValue(Existing, InN.getResNo());
// Nope it doesn't. Remove the node from its current place in the maps.
if (InsertPos)
if (!RemoveNodeFromCSEMaps(N))
InsertPos = 0;
// Now we update the operands.
N->OperandList[0].getVal()->removeUser(0, N);
N->OperandList[0] = Op;
N->OperandList[0].setUser(N);
Op.getNode()->addUser(0, N);
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
SDValue SelectionDAG::
UpdateNodeOperands(SDValue InN, SDValue Op1, SDValue Op2) {
SDNode *N = InN.getNode();
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 SDValue(Existing, InN.getResNo());
// Nope it doesn't. Remove the node from its current place in the maps.
if (InsertPos)
if (!RemoveNodeFromCSEMaps(N))
InsertPos = 0;
// 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.getNode()->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.getNode()->addUser(1, N);
}
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
SDValue SelectionDAG::
UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, SDValue Op3) {
SDValue Ops[] = { Op1, Op2, Op3 };
return UpdateNodeOperands(N, Ops, 3);
}
SDValue SelectionDAG::
UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
SDValue Op3, SDValue Op4) {
SDValue Ops[] = { Op1, Op2, Op3, Op4 };
return UpdateNodeOperands(N, Ops, 4);
}
SDValue SelectionDAG::
UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
SDValue Op3, SDValue Op4, SDValue Op5) {
SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 };
return UpdateNodeOperands(N, Ops, 5);
}
SDValue SelectionDAG::
UpdateNodeOperands(SDValue InN, const SDValue *Ops, unsigned NumOps) {
SDNode *N = InN.getNode();
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 SDValue(Existing, InN.getResNo());
// Nope it doesn't. Remove the node from its current place in the maps.
if (InsertPos)
if (!RemoveNodeFromCSEMaps(N))
InsertPos = 0;
// 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].getNode()->addUser(i, N);
}
}
// If this gets put into a CSE map, add it.
if (InsertPos) CSEMap.InsertNode(N, InsertPos);
return InN;
}
/// DropOperands - Release the operands and set this node to have
/// zero operands.
void SDNode::DropOperands() {
// Unlike the code in MorphNodeTo that does this, we don't need to
// watch for dead nodes here.
for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
I->getVal()->removeUser(std::distance(op_begin(), I), this);
NumOperands = 0;
}
/// SelectNodeTo - These are wrappers around MorphNodeTo that accept a
/// machine opcode.
///
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT) {
SDVTList VTs = getVTList(VT);
return SelectNodeTo(N, MachineOpc, VTs, 0, 0);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT, SDValue Op1) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT, SDValue Op1,
SDValue Op2) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1, Op2 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT, SDValue Op1,
SDValue Op2, SDValue Op3) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1, Op2, Op3 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT, const SDValue *Ops,
unsigned NumOps) {
SDVTList VTs = getVTList(VT);
return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2, const SDValue *Ops,
unsigned NumOps) {
SDVTList VTs = getVTList(VT1, VT2);
return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2) {
SDVTList VTs = getVTList(VT1, VT2);
return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2, MVT VT3,
const SDValue *Ops, unsigned NumOps) {
SDVTList VTs = getVTList(VT1, VT2, VT3);
return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2, MVT VT3, MVT VT4,
const SDValue *Ops, unsigned NumOps) {
SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2,
SDValue Op1) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2,
SDValue Op1, SDValue Op2) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1, Op2 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2,
SDValue Op1, SDValue Op2,
SDValue Op3) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1, Op2, Op3 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
MVT VT1, MVT VT2, MVT VT3,
SDValue Op1, SDValue Op2,
SDValue Op3) {
SDVTList VTs = getVTList(VT1, VT2, VT3);
SDValue Ops[] = { Op1, Op2, Op3 };
return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
}
SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
SDVTList VTs, const SDValue *Ops,
unsigned NumOps) {
return MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT) {
SDVTList VTs = getVTList(VT);
return MorphNodeTo(N, Opc, VTs, 0, 0);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT, SDValue Op1) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1 };
return MorphNodeTo(N, Opc, VTs, Ops, 1);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT, SDValue Op1,
SDValue Op2) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1, Op2 };
return MorphNodeTo(N, Opc, VTs, Ops, 2);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT, SDValue Op1,
SDValue Op2, SDValue Op3) {
SDVTList VTs = getVTList(VT);
SDValue Ops[] = { Op1, Op2, Op3 };
return MorphNodeTo(N, Opc, VTs, Ops, 3);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT, const SDValue *Ops,
unsigned NumOps) {
SDVTList VTs = getVTList(VT);
return MorphNodeTo(N, Opc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2, const SDValue *Ops,
unsigned NumOps) {
SDVTList VTs = getVTList(VT1, VT2);
return MorphNodeTo(N, Opc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2) {
SDVTList VTs = getVTList(VT1, VT2);
return MorphNodeTo(N, Opc, VTs, (SDValue *)0, 0);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2, MVT VT3,
const SDValue *Ops, unsigned NumOps) {
SDVTList VTs = getVTList(VT1, VT2, VT3);
return MorphNodeTo(N, Opc, VTs, Ops, NumOps);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2,
SDValue Op1) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1 };
return MorphNodeTo(N, Opc, VTs, Ops, 1);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2,
SDValue Op1, SDValue Op2) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1, Op2 };
return MorphNodeTo(N, Opc, VTs, Ops, 2);
}
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
MVT VT1, MVT VT2,
SDValue Op1, SDValue Op2,
SDValue Op3) {
SDVTList VTs = getVTList(VT1, VT2);
SDValue Ops[] = { Op1, Op2, Op3 };
return MorphNodeTo(N, Opc, VTs, Ops, 3);
}
/// MorphNodeTo - These *mutate* the specified node to have the specified
/// return type, opcode, and operands.
///
/// Note that MorphNodeTo 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.
///
/// Using MorphNodeTo is faster than creating a new node and swapping it in
/// with ReplaceAllUsesWith both because it often avoids allocating a new
/// node, and because it doesn't require CSE recalculation for any of
/// the node's users.
///
SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
SDVTList VTs, const SDValue *Ops,
unsigned NumOps) {
// If an identical node already exists, use it.
void *IP = 0;
if (VTs.VTs[VTs.NumVTs-1] != MVT::Flag) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, VTs, Ops, NumOps);
if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
return ON;
}
if (!RemoveNodeFromCSEMaps(N))
IP = 0;
// Start the morphing.
N->NodeType = Opc;
N->ValueList = VTs.VTs;
N->NumValues = VTs.NumVTs;
// Clear the operands list, updating used nodes to remove this from their
// use list. Keep track of any operands that become dead as a result.
SmallPtrSet<SDNode*, 16> DeadNodeSet;
for (SDNode::op_iterator B = N->op_begin(), I = B, E = N->op_end();
I != E; ++I) {
SDNode *Used = I->getVal();
Used->removeUser(std::distance(B, I), N);
if (Used->use_empty())
DeadNodeSet.insert(Used);
}
// If NumOps is larger than the # of operands we currently have, reallocate
// the operand list.
if (NumOps > N->NumOperands) {
if (N->OperandsNeedDelete)
delete[] N->OperandList;
if (N->isMachineOpcode()) {
// We're creating a final node that will live unmorphed for the
// remainder of the current SelectionDAG iteration, so we can allocate
// the operands directly out of a pool with no recycling metadata.
N->OperandList = OperandAllocator.Allocate<SDUse>(NumOps);
N->OperandsNeedDelete = false;
} else {
N->OperandList = new SDUse[NumOps];
N->OperandsNeedDelete = true;
}
}
// Assign the new operands.
N->NumOperands = NumOps;
for (unsigned i = 0, e = NumOps; i != e; ++i) {
N->OperandList[i] = Ops[i];
N->OperandList[i].setUser(N);
SDNode *ToUse = N->OperandList[i].getVal();
ToUse->addUser(i, N);
}
// Delete any nodes that are still dead after adding the uses for the
// new operands.
SmallVector<SDNode *, 16> DeadNodes;
for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
E = DeadNodeSet.end(); I != E; ++I)
if ((*I)->use_empty())
DeadNodes.push_back(*I);
RemoveDeadNodes(DeadNodes);
if (IP)
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 VT) {
return getNode(~Opcode, VT).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, SDValue Op1) {
return getNode(~Opcode, VT, Op1).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
SDValue Op1, SDValue Op2) {
return getNode(~Opcode, VT, Op1, Op2).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
SDValue Op1, SDValue Op2,
SDValue Op3) {
return getNode(~Opcode, VT, Op1, Op2, Op3).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
const SDValue *Ops, unsigned NumOps) {
return getNode(~Opcode, VT, Ops, NumOps).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2) {
const MVT *VTs = getNodeValueTypes(VT1, VT2);
SDValue Op;
return getNode(~Opcode, VTs, 2, &Op, 0).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
MVT VT2, SDValue Op1) {
const MVT *VTs = getNodeValueTypes(VT1, VT2);
return getNode(~Opcode, VTs, 2, &Op1, 1).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
MVT VT2, SDValue Op1,
SDValue Op2) {
const MVT *VTs = getNodeValueTypes(VT1, VT2);
SDValue Ops[] = { Op1, Op2 };
return getNode(~Opcode, VTs, 2, Ops, 2).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
MVT VT2, SDValue Op1,
SDValue Op2, SDValue Op3) {
const MVT *VTs = getNodeValueTypes(VT1, VT2);
SDValue Ops[] = { Op1, Op2, Op3 };
return getNode(~Opcode, VTs, 2, Ops, 3).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2,
const SDValue *Ops, unsigned NumOps) {
const MVT *VTs = getNodeValueTypes(VT1, VT2);
return getNode(~Opcode, VTs, 2, Ops, NumOps).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
SDValue Op1, SDValue Op2) {
const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
SDValue Ops[] = { Op1, Op2 };
return getNode(~Opcode, VTs, 3, Ops, 2).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
SDValue Op1, SDValue Op2,
SDValue Op3) {
const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
SDValue Ops[] = { Op1, Op2, Op3 };
return getNode(~Opcode, VTs, 3, Ops, 3).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
const SDValue *Ops, unsigned NumOps) {
const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
return getNode(~Opcode, VTs, 3, Ops, NumOps).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
MVT VT2, MVT VT3, MVT VT4,
const SDValue *Ops, unsigned NumOps) {
std::vector<MVT> VTList;
VTList.push_back(VT1);
VTList.push_back(VT2);
VTList.push_back(VT3);
VTList.push_back(VT4);
const MVT *VTs = getNodeValueTypes(VTList);
return getNode(~Opcode, VTs, 4, Ops, NumOps).getNode();
}
SDNode *SelectionDAG::getTargetNode(unsigned Opcode,
const std::vector<MVT> &ResultTys,
const SDValue *Ops, unsigned NumOps) {
const MVT *VTs = getNodeValueTypes(ResultTys);
return getNode(~Opcode, VTs, ResultTys.size(),
Ops, NumOps).getNode();
}
/// getNodeIfExists - Get the specified node if it's already available, or
/// else return NULL.
SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
const SDValue *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(SDValue FromN, SDValue To,
DAGUpdateListener *UpdateListener) {
SDNode *From = FromN.getNode();
assert(From->getNumValues() == 1 && FromN.getResNo() == 0 &&
"Cannot replace with this method!");
assert(From != To.getNode() && "Cannot replace uses of with self");
// Iterate over all the existing uses of From. This specifically avoids
// visiting any new uses of From that arrise while the replacement is
// happening, because any such uses would be the result of CSE: If an
// existing node looks like From after one of its operands is replaced
// by To, we don't want to replace of all its users with To too.
// See PR3018 for more info.
SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
while (UI != UE) {
SDNode *U = *UI;
do ++UI; while (UI != UE && *UI == U);
// 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.getNode()->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, Existing);
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->getVTList().VTs == To->getVTList().VTs &&
From->getNumValues() == To->getNumValues() &&
"Cannot use this version of ReplaceAllUsesWith!");
// Handle the trivial case.
if (From == To)
return;
// Iterate over just the existing users of From. See the comments in
// the ReplaceAllUsesWith above.
SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
while (UI != UE) {
SDNode *U = *UI;
do ++UI; while (UI != UE && *UI == U);
// 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->getSDValue().setNode(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, Existing);
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,
const SDValue *To,
DAGUpdateListener *UpdateListener) {
if (From->getNumValues() == 1) // Handle the simple case efficiently.
return ReplaceAllUsesWith(SDValue(From, 0), To[0], UpdateListener);
// Iterate over just the existing users of From. See the comments in
// the ReplaceAllUsesWith above.
SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
while (UI != UE) {
SDNode *U = *UI;
do ++UI; while (UI != UE && *UI == U);
// 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 SDValue &ToOp = To[I->getSDValue().getResNo()];
From->removeUser(operandNum, U);
*I = ToOp;
I->setUser(U);
ToOp.getNode()->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, Existing);
DeleteNodeNotInCSEMaps(U);
} else {
// If the node doesn't already exist, we updated it. Inform a listener if
// it exists.
if (UpdateListener)
UpdateListener->NodeUpdated(U);
}
}
}
/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
/// uses of other values produced by From.getVal() alone. The Deleted vector is
/// handled the same way as for ReplaceAllUsesWith.
void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
DAGUpdateListener *UpdateListener){
// Handle the really simple, really trivial case efficiently.
if (From == To) return;
// Handle the simple, trivial, case efficiently.
if (From.getNode()->getNumValues() == 1) {
ReplaceAllUsesWith(From, To, UpdateListener);
return;
}
// Get all of the users of From.getNode(). We want these in a nice,
// deterministically ordered and uniqued set, so we use a SmallSetVector.
SmallSetVector<SDNode*, 16> Users(From.getNode()->use_begin(), From.getNode()->use_end());
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.getNode()->removeUser(Op-User->op_begin(), User);
*Op = To;
Op->setUser(User);
To.getNode()->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.
ReplaceAllUsesWith(User, Existing, UpdateListener);
// User is now dead. Notify a listener if present.
if (UpdateListener) UpdateListener->NodeDeleted(User, Existing);
DeleteNodeNotInCSEMaps(User);
}
}
/// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving
/// uses of other values produced by From.getVal() alone. The same value may
/// appear in both the From and To list. The Deleted vector is
/// handled the same way as for ReplaceAllUsesWith.
void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From,
const SDValue *To,
unsigned Num,
DAGUpdateListener *UpdateListener){
// Handle the simple, trivial case efficiently.
if (Num == 1)
return ReplaceAllUsesOfValueWith(*From, *To, UpdateListener);
SmallVector<std::pair<SDNode *, unsigned>, 16> Users;
for (unsigned i = 0; i != Num; ++i)
for (SDNode::use_iterator UI = From[i].getNode()->use_begin(),
E = From[i].getNode()->use_end(); UI != E; ++UI)
Users.push_back(std::make_pair(*UI, i));
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().first;
unsigned i = Users.back().second;
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[i]) 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[i]) {
From[i].getNode()->removeUser(Op-User->op_begin(), User);
*Op = To[i];
Op->setUser(User);
To[i].getNode()->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.
ReplaceAllUsesWith(User, Existing, UpdateListener);
// User is now dead. Notify a listener if present.
if (UpdateListener) UpdateListener->NodeDeleted(User, Existing);
DeleteNodeNotInCSEMaps(User);
}
}
/// 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() {
unsigned DAGSize = 0;
// SortedPos tracks the progress of the algorithm. Nodes before it are
// sorted, nodes after it are unsorted. When the algorithm completes
// it is at the end of the list.
allnodes_iterator SortedPos = allnodes_begin();
// Visit all the nodes. Move nodes with no operands to the front of
// the list immediately. Annotate nodes that do have operands with their
// operand count. Before we do this, the Node Id fields of the nodes
// may contain arbitrary values. After, the Node Id fields for nodes
// before SortedPos will contain the topological sort index, and the
// Node Id fields for nodes At SortedPos and after will contain the
// count of outstanding operands.
for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) {
SDNode *N = I++;
unsigned Degree = N->getNumOperands();
if (Degree == 0) {
// A node with no uses, add it to the result array immediately.
N->setNodeId(DAGSize++);
allnodes_iterator Q = N;
if (Q != SortedPos)
SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q));
++SortedPos;
} else {
// Temporarily use the Node Id as scratch space for the degree count.
N->setNodeId(Degree);
}
}
// Visit all the nodes. As we iterate, moves nodes into sorted order,
// such that by the time the end is reached all nodes will be sorted.
for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) {
SDNode *N = I;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDNode *P = *UI;
unsigned Degree = P->getNodeId();
--Degree;
if (Degree == 0) {
// All of P's operands are sorted, so P may sorted now.
P->setNodeId(DAGSize++);
if (P != SortedPos)
SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P));
++SortedPos;
} else {
// Update P's outstanding operand count.
P->setNodeId(Degree);
}
}
}
assert(SortedPos == AllNodes.end() &&
"Topological sort incomplete!");
assert(AllNodes.front().getOpcode() == ISD::EntryToken &&
"First node in topological sort is not the entry token!");
assert(AllNodes.front().getNodeId() == 0 &&
"First node in topological sort has non-zero id!");
assert(AllNodes.front().getNumOperands() == 0 &&
"First node in topological sort has operands!");
assert(AllNodes.back().getNodeId() == (int)DAGSize-1 &&
"Last node in topologic sort has unexpected id!");
assert(AllNodes.back().use_empty() &&
"Last node in topologic sort has users!");
assert(DAGSize == allnodes_size() && "Node count mismatch!");
return DAGSize;
}
//===----------------------------------------------------------------------===//
// SDNode Class
//===----------------------------------------------------------------------===//
HandleSDNode::~HandleSDNode() {
DropOperands();
}
GlobalAddressSDNode::GlobalAddressSDNode(bool isTarget, const GlobalValue *GA,
MVT VT, int64_t 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);
}
MemSDNode::MemSDNode(unsigned Opc, SDVTList VTs, MVT memvt,
const Value *srcValue, int SVO,
unsigned alignment, bool vol)
: SDNode(Opc, VTs), MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO),
Flags(encodeMemSDNodeFlags(vol, alignment)) {
assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!");
assert(getAlignment() == alignment && "Alignment representation error!");
assert(isVolatile() == vol && "Volatile representation error!");
}
MemSDNode::MemSDNode(unsigned Opc, SDVTList VTs, const SDValue *Ops,
unsigned NumOps, MVT memvt, const Value *srcValue,
int SVO, unsigned alignment, bool vol)
: SDNode(Opc, VTs, Ops, NumOps),
MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO),
Flags(vol | ((Log2_32(alignment) + 1) << 1)) {
assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!");
assert(getAlignment() == alignment && "Alignment representation error!");
assert(isVolatile() == vol && "Volatile representation error!");
}
/// getMemOperand - Return a MachineMemOperand object describing the memory
/// reference performed by this memory reference.
MachineMemOperand MemSDNode::getMemOperand() const {
int Flags = 0;
if (isa<LoadSDNode>(this))
Flags = MachineMemOperand::MOLoad;
else if (isa<StoreSDNode>(this))
Flags = MachineMemOperand::MOStore;
else if (isa<AtomicSDNode>(this)) {
Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
}
else {
const MemIntrinsicSDNode* MemIntrinNode = dyn_cast<MemIntrinsicSDNode>(this);
assert(MemIntrinNode && "Unknown MemSDNode opcode!");
if (MemIntrinNode->readMem()) Flags |= MachineMemOperand::MOLoad;
if (MemIntrinNode->writeMem()) Flags |= MachineMemOperand::MOStore;
}
int Size = (getMemoryVT().getSizeInBits() + 7) >> 3;
if (isVolatile()) Flags |= MachineMemOperand::MOVolatile;
// Check if the memory reference references a frame index
const FrameIndexSDNode *FI =
dyn_cast<const FrameIndexSDNode>(getBasePtr().getNode());
if (!getSrcValue() && FI)
return MachineMemOperand(PseudoSourceValue::getFixedStack(FI->getIndex()),
Flags, 0, Size, getAlignment());
else
return MachineMemOperand(getSrcValue(), Flags, getSrcValueOffset(),
Size, getAlignment());
}
/// Profile - Gather unique data for the node.
///
void SDNode::Profile(FoldingSetNodeID &ID) const {
AddNodeIDNode(ID, this);
}
/// getValueTypeList - Return a pointer to the specified value type.
///
const MVT *SDNode::getValueTypeList(MVT VT) {
if (VT.isExtended()) {
static std::set<MVT, MVT::compareRawBits> EVTs;
return &(*EVTs.insert(VT).first);
} else {
static MVT VTs[MVT::LAST_VALUETYPE];
VTs[VT.getSimpleVT()] = VT;
return &VTs[VT.getSimpleVT()];
}
}
/// 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!");
// 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.getUse().getSDValue().getResNo() == Value) {
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!");
for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI)
if (UI.getUse().getSDValue().getResNo() == Value)
return true;
return false;
}
/// isOnlyUserOf - Return true if this node is the only use of N.
///
bool SDNode::isOnlyUserOf(SDNode *N) const {
bool Seen = false;
for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
SDNode *User = *I;
if (User == this)
Seen = true;
else
return false;
}
return Seen;
}
/// isOperand - Return true if this node is an operand of N.
///
bool SDValue::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 SDValue::reachesChainWithoutSideEffects(SDValue 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).getNode();
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])->getZExtValue();
}
std::string SDNode::getOperationName(const SelectionDAG *G) const {
switch (getOpcode()) {
default:
if (getOpcode() < ISD::BUILTIN_OP_END)
return "<<Unknown DAG Node>>";
if (isMachineOpcode()) {
if (G)
if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
if (getMachineOpcode() < TII->getNumOpcodes())
return TII->get(getMachineOpcode()).getName();
return "<<Unknown Machine Node>>";
}
if (G) {
const TargetLowering &TLI = G->getTargetLoweringInfo();
const char *Name = TLI.getTargetNodeName(getOpcode());
if (Name) return Name;
return "<<Unknown Target Node>>";
}
return "<<Unknown Node>>";
#ifndef NDEBUG
case ISD::DELETED_NODE:
return "<<Deleted Node!>>";
#endif
case ISD::PREFETCH: return "Prefetch";
case ISD::MEMBARRIER: return "MemBarrier";
case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap";
case ISD::ATOMIC_SWAP: return "AtomicSwap";
case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd";
case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub";
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_NAND: return "AtomicLoadNand";
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::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::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))->getZExtValue();
return Intrinsic::getName((Intrinsic::ID)IID);
}
case ISD::INTRINSIC_VOID:
case ISD::INTRINSIC_W_CHAIN: {
unsigned IID = cast<ConstantSDNode>(getOperand(1))->getZExtValue();
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::DBG_LABEL: return "dbg_label";
case ISD::EH_LABEL: return "eh_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";
case ISD::FTRUNC: return "ftrunc";
case ISD::FFLOOR: return "ffloor";
case ISD::FCEIL: return "fceil";
case ISD::FRINT: return "frint";
case ISD::FNEARBYINT: return "fnearbyint";
// 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 "udivrem";
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::SADDO: return "saddo";
case ISD::UADDO: return "uaddo";
case ISD::SSUBO: return "ssubo";
case ISD::USUBO: return "usubo";
case ISD::SMULO: return "smulo";
case ISD::UMULO: return "umulo";
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";
case ISD::CONVERT_RNDSAT: {
switch (cast<CvtRndSatSDNode>(this)->getCvtCode()) {
default: assert(0 && "Unknown cvt code!");
case ISD::CVT_FF: return "cvt_ff";
case ISD::CVT_FS: return "cvt_fs";
case ISD::CVT_FU: return "cvt_fu";
case ISD::CVT_SF: return "cvt_sf";
case ISD::CVT_UF: return "cvt_uf";
case ISD::CVT_SS: return "cvt_ss";
case ISD::CVT_SU: return "cvt_su";
case ISD::CVT_US: return "cvt_us";
case ISD::CVT_UU: return "cvt_uu";
}
}
// 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::DBG_STOPPOINT: return "dbg_stoppoint";
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 {
print(errs(), G);
errs().flush();
}
void SDNode::print(raw_ostream &OS, const SelectionDAG *G) const {
OS << (void*)this << ": ";
for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
if (i) OS << ",";
if (getValueType(i) == MVT::Other)
OS << "ch";
else
OS << getValueType(i).getMVTString();
}
OS << " = " << getOperationName(G);
OS << " ";
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
if (i) OS << ", ";
OS << (void*)getOperand(i).getNode();
if (unsigned RN = getOperand(i).getResNo())
OS << ":" << RN;
}
if (!isTargetOpcode() && getOpcode() == ISD::VECTOR_SHUFFLE) {
SDNode *Mask = getOperand(2).getNode();
OS << "<";
for (unsigned i = 0, e = Mask->getNumOperands(); i != e; ++i) {
if (i) OS << ",";
if (Mask->getOperand(i).getOpcode() == ISD::UNDEF)
OS << "u";
else
OS << cast<ConstantSDNode>(Mask->getOperand(i))->getZExtValue();
}
OS << ">";
}
if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
OS << '<' << CSDN->getAPIntValue() << '>';
} else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
OS << '<' << CSDN->getValueAPF().convertToFloat() << '>';
else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
OS << '<' << CSDN->getValueAPF().convertToDouble() << '>';
else {
OS << "<APFloat(";
CSDN->getValueAPF().bitcastToAPInt().dump();
OS << ")>";
}
} else if (const GlobalAddressSDNode *GADN =
dyn_cast<GlobalAddressSDNode>(this)) {
int64_t offset = GADN->getOffset();
OS << '<';
WriteAsOperand(OS, GADN->getGlobal());
OS << '>';
if (offset > 0)
OS << " + " << offset;
else
OS << " " << offset;
} else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
OS << "<" << FIDN->getIndex() << ">";
} else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
OS << "<" << JTDN->getIndex() << ">";
} else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
int offset = CP->getOffset();
if (CP->isMachineConstantPoolEntry())
OS << "<" << *CP->getMachineCPVal() << ">";
else
OS << "<" << *CP->getConstVal() << ">";
if (offset > 0)
OS << " + " << offset;
else
OS << " " << offset;
} else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
OS << "<";
const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
if (LBB)
OS << LBB->getName() << " ";
OS << (const void*)BBDN->getBasicBlock() << ">";
} else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
if (G && R->getReg() &&
TargetRegisterInfo::isPhysicalRegister(R->getReg())) {
OS << " " << G->getTarget().getRegisterInfo()->getName(R->getReg());
} else {
OS << " #" << R->getReg();
}
} else if (const ExternalSymbolSDNode *ES =
dyn_cast<ExternalSymbolSDNode>(this)) {
OS << "'" << ES->getSymbol() << "'";
} else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
if (M->getValue())
OS << "<" << M->getValue() << ">";
else
OS << "<null>";
} else if (const MemOperandSDNode *M = dyn_cast<MemOperandSDNode>(this)) {
if (M->MO.getValue())
OS << "<" << M->MO.getValue() << ":" << M->MO.getOffset() << ">";
else
OS << "<null:" << M->MO.getOffset() << ">";
} else if (const ARG_FLAGSSDNode *N = dyn_cast<ARG_FLAGSSDNode>(this)) {
OS << N->getArgFlags().getArgFlagsString();
} else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
OS << ":" << N->getVT().getMVTString();
}
else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
const Value *SrcValue = LD->getSrcValue();
int SrcOffset = LD->getSrcValueOffset();
OS << " <";
if (SrcValue)
OS << SrcValue;
else
OS << "null";
OS << ":" << SrcOffset << ">";
bool doExt = true;
switch (LD->getExtensionType()) {
default: doExt = false; break;
case ISD::EXTLOAD: OS << " <anyext "; break;
case ISD::SEXTLOAD: OS << " <sext "; break;
case ISD::ZEXTLOAD: OS << " <zext "; break;
}
if (doExt)
OS << LD->getMemoryVT().getMVTString() << ">";
const char *AM = getIndexedModeName(LD->getAddressingMode());
if (*AM)
OS << " " << AM;
if (LD->isVolatile())
OS << " <volatile>";
OS << " alignment=" << LD->getAlignment();
} else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
const Value *SrcValue = ST->getSrcValue();
int SrcOffset = ST->getSrcValueOffset();
OS << " <";
if (SrcValue)
OS << SrcValue;
else
OS << "null";
OS << ":" << SrcOffset << ">";
if (ST->isTruncatingStore())
OS << " <trunc " << ST->getMemoryVT().getMVTString() << ">";
const char *AM = getIndexedModeName(ST->getAddressingMode());
if (*AM)
OS << " " << AM;
if (ST->isVolatile())
OS << " <volatile>";
OS << " alignment=" << ST->getAlignment();
} else if (const AtomicSDNode* AT = dyn_cast<AtomicSDNode>(this)) {
const Value *SrcValue = AT->getSrcValue();
int SrcOffset = AT->getSrcValueOffset();
OS << " <";
if (SrcValue)
OS << SrcValue;
else
OS << "null";
OS << ":" << SrcOffset << ">";
if (AT->isVolatile())
OS << " <volatile>";
OS << " alignment=" << AT->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).getNode()->hasOneUse())
DumpNodes(N->getOperand(i).getNode(), indent+2, G);
else
cerr << "\n" << std::string(indent+2, ' ')
<< (void*)N->getOperand(i).getNode() << ": <multiple use>";
cerr << "\n" << std::string(indent, ' ');
N->dump(G);
}
void SelectionDAG::dump() const {
cerr << "SelectionDAG has " << AllNodes.size() << " nodes:";
for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end();
I != E; ++I) {
const SDNode *N = I;
if (!N->hasOneUse() && N != getRoot().getNode())
DumpNodes(N, 2, this);
}
if (getRoot().getNode()) DumpNodes(getRoot().getNode(), 2, this);
cerr << "\n\n";
}
const Type *ConstantPoolSDNode::getType() const {
if (isMachineConstantPoolEntry())
return Val.MachineCPVal->getType();
return Val.ConstVal->getType();
}
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