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llvm-6502/include/llvm/CodeGen/SelectionDAG.h
Eli Friedman 55ba816883 Misc optimizer+codegen work for 'cmpxchg' and 'atomicrmw'. They appear to be 
working on x86 (at least for trivial testcases); other architectures will
need more work so that they actually emit the appropriate instructions for
orderings stricter than 'monotonic'. (As far as I can tell, the ARM, PPC,
Mips, and Alpha backends need such changes.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136457 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-29 03:05:32 +00:00

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//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SelectionDAG class, and transitively defines the
// SDNode class and subclasses.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_SELECTIONDAG_H
#define LLVM_CODEGEN_SELECTIONDAG_H
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/Support/RecyclingAllocator.h"
#include "llvm/Target/TargetMachine.h"
#include <cassert>
#include <vector>
#include <map>
#include <string>
namespace llvm {
class AliasAnalysis;
class MachineConstantPoolValue;
class MachineFunction;
class MDNode;
class SDNodeOrdering;
class SDDbgValue;
class TargetLowering;
class TargetSelectionDAGInfo;
template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> {
private:
mutable ilist_half_node<SDNode> Sentinel;
public:
SDNode *createSentinel() const {
return static_cast<SDNode*>(&Sentinel);
}
static void destroySentinel(SDNode *) {}
SDNode *provideInitialHead() const { return createSentinel(); }
SDNode *ensureHead(SDNode*) const { return createSentinel(); }
static void noteHead(SDNode*, SDNode*) {}
static void deleteNode(SDNode *) {
assert(0 && "ilist_traits<SDNode> shouldn't see a deleteNode call!");
}
private:
static void createNode(const SDNode &);
};
/// SDDbgInfo - Keeps track of dbg_value information through SDISel. We do
/// not build SDNodes for these so as not to perturb the generated code;
/// instead the info is kept off to the side in this structure. Each SDNode may
/// have one or more associated dbg_value entries. This information is kept in
/// DbgValMap.
/// Byval parameters are handled separately because they don't use alloca's,
/// which busts the normal mechanism. There is good reason for handling all
/// parameters separately: they may not have code generated for them, they
/// should always go at the beginning of the function regardless of other code
/// motion, and debug info for them is potentially useful even if the parameter
/// is unused. Right now only byval parameters are handled separately.
class SDDbgInfo {
SmallVector<SDDbgValue*, 32> DbgValues;
SmallVector<SDDbgValue*, 32> ByvalParmDbgValues;
DenseMap<const SDNode*, SmallVector<SDDbgValue*, 2> > DbgValMap;
void operator=(const SDDbgInfo&); // Do not implement.
SDDbgInfo(const SDDbgInfo&); // Do not implement.
public:
SDDbgInfo() {}
void add(SDDbgValue *V, const SDNode *Node, bool isParameter) {
if (isParameter) {
ByvalParmDbgValues.push_back(V);
} else DbgValues.push_back(V);
if (Node)
DbgValMap[Node].push_back(V);
}
void clear() {
DbgValMap.clear();
DbgValues.clear();
ByvalParmDbgValues.clear();
}
bool empty() const {
return DbgValues.empty() && ByvalParmDbgValues.empty();
}
ArrayRef<SDDbgValue*> getSDDbgValues(const SDNode *Node) {
DenseMap<const SDNode*, SmallVector<SDDbgValue*, 2> >::iterator I =
DbgValMap.find(Node);
if (I != DbgValMap.end())
return I->second;
return ArrayRef<SDDbgValue*>();
}
typedef SmallVector<SDDbgValue*,32>::iterator DbgIterator;
DbgIterator DbgBegin() { return DbgValues.begin(); }
DbgIterator DbgEnd() { return DbgValues.end(); }
DbgIterator ByvalParmDbgBegin() { return ByvalParmDbgValues.begin(); }
DbgIterator ByvalParmDbgEnd() { return ByvalParmDbgValues.end(); }
};
enum CombineLevel {
Unrestricted, // Combine may create illegal operations and illegal types.
NoIllegalTypes, // Combine may create illegal operations but no illegal types.
NoIllegalOperations // Combine may only create legal operations and types.
};
class SelectionDAG;
void checkForCycles(const SDNode *N);
void checkForCycles(const SelectionDAG *DAG);
/// SelectionDAG class - This is used to represent a portion of an LLVM function
/// in a low-level Data Dependence DAG representation suitable for instruction
/// selection. This DAG is constructed as the first step of instruction
/// selection in order to allow implementation of machine specific optimizations
/// and code simplifications.
///
/// The representation used by the SelectionDAG is a target-independent
/// representation, which has some similarities to the GCC RTL representation,
/// but is significantly more simple, powerful, and is a graph form instead of a
/// linear form.
///
class SelectionDAG {
const TargetMachine &TM;
const TargetLowering &TLI;
const TargetSelectionDAGInfo &TSI;
MachineFunction *MF;
LLVMContext *Context;
/// EntryNode - The starting token.
SDNode EntryNode;
/// Root - The root of the entire DAG.
SDValue Root;
/// AllNodes - A linked list of nodes in the current DAG.
ilist<SDNode> AllNodes;
/// NodeAllocatorType - The AllocatorType for allocating SDNodes. We use
/// pool allocation with recycling.
typedef RecyclingAllocator<BumpPtrAllocator, SDNode, sizeof(LargestSDNode),
AlignOf<MostAlignedSDNode>::Alignment>
NodeAllocatorType;
/// NodeAllocator - Pool allocation for nodes.
NodeAllocatorType NodeAllocator;
/// CSEMap - This structure is used to memoize nodes, automatically performing
/// CSE with existing nodes when a duplicate is requested.
FoldingSet<SDNode> CSEMap;
/// OperandAllocator - Pool allocation for machine-opcode SDNode operands.
BumpPtrAllocator OperandAllocator;
/// Allocator - Pool allocation for misc. objects that are created once per
/// SelectionDAG.
BumpPtrAllocator Allocator;
/// SDNodeOrdering - The ordering of the SDNodes. It roughly corresponds to
/// the ordering of the original LLVM instructions.
SDNodeOrdering *Ordering;
/// DbgInfo - Tracks dbg_value information through SDISel.
SDDbgInfo *DbgInfo;
/// setGraphColorHelper - Implementation of setSubgraphColor.
/// Return whether we had to truncate the search.
///
bool setSubgraphColorHelper(SDNode *N, const char *Color,
DenseSet<SDNode *> &visited,
int level, bool &printed);
void operator=(const SelectionDAG&); // Do not implement.
SelectionDAG(const SelectionDAG&); // Do not implement.
public:
explicit SelectionDAG(const TargetMachine &TM);
~SelectionDAG();
/// init - Prepare this SelectionDAG to process code in the given
/// MachineFunction.
///
void init(MachineFunction &mf);
/// clear - Clear state and free memory necessary to make this
/// SelectionDAG ready to process a new block.
///
void clear();
MachineFunction &getMachineFunction() const { return *MF; }
const TargetMachine &getTarget() const { return TM; }
const TargetLowering &getTargetLoweringInfo() const { return TLI; }
const TargetSelectionDAGInfo &getSelectionDAGInfo() const { return TSI; }
LLVMContext *getContext() const {return Context; }
/// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
///
void viewGraph(const std::string &Title);
void viewGraph();
#ifndef NDEBUG
std::map<const SDNode *, std::string> NodeGraphAttrs;
#endif
/// clearGraphAttrs - Clear all previously defined node graph attributes.
/// Intended to be used from a debugging tool (eg. gdb).
void clearGraphAttrs();
/// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
///
void setGraphAttrs(const SDNode *N, const char *Attrs);
/// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
/// Used from getNodeAttributes.
const std::string getGraphAttrs(const SDNode *N) const;
/// setGraphColor - Convenience for setting node color attribute.
///
void setGraphColor(const SDNode *N, const char *Color);
/// setGraphColor - Convenience for setting subgraph color attribute.
///
void setSubgraphColor(SDNode *N, const char *Color);
typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
typedef ilist<SDNode>::iterator allnodes_iterator;
allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
allnodes_iterator allnodes_end() { return AllNodes.end(); }
ilist<SDNode>::size_type allnodes_size() const {
return AllNodes.size();
}
/// getRoot - Return the root tag of the SelectionDAG.
///
const SDValue &getRoot() const { return Root; }
/// getEntryNode - Return the token chain corresponding to the entry of the
/// function.
SDValue getEntryNode() const {
return SDValue(const_cast<SDNode *>(&EntryNode), 0);
}
/// setRoot - Set the current root tag of the SelectionDAG.
///
const SDValue &setRoot(SDValue N) {
assert((!N.getNode() || N.getValueType() == MVT::Other) &&
"DAG root value is not a chain!");
if (N.getNode())
checkForCycles(N.getNode());
Root = N;
if (N.getNode())
checkForCycles(this);
return Root;
}
/// Combine - This iterates over the nodes in the SelectionDAG, folding
/// certain types of nodes together, or eliminating superfluous nodes. The
/// Level argument controls whether Combine is allowed to produce nodes and
/// types that are illegal on the target.
void Combine(CombineLevel Level, AliasAnalysis &AA,
CodeGenOpt::Level OptLevel);
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
/// only uses types natively supported by the target. Returns "true" if it
/// made any changes.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
bool LegalizeTypes();
/// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
/// compatible with the target instruction selector, as indicated by the
/// TargetLowering object.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
void Legalize();
/// LegalizeVectors - This transforms the SelectionDAG into a SelectionDAG
/// that only uses vector math operations supported by the target. This is
/// necessary as a separate step from Legalize because unrolling a vector
/// operation can introduce illegal types, which requires running
/// LegalizeTypes again.
///
/// This returns true if it made any changes; in that case, LegalizeTypes
/// is called again before Legalize.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
bool LegalizeVectors();
/// RemoveDeadNodes - This method deletes all unreachable nodes in the
/// SelectionDAG.
void RemoveDeadNodes();
/// DeleteNode - Remove the specified node from the system. This node must
/// have no referrers.
void DeleteNode(SDNode *N);
/// getVTList - Return an SDVTList that represents the list of values
/// specified.
SDVTList getVTList(EVT VT);
SDVTList getVTList(EVT VT1, EVT VT2);
SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3);
SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4);
SDVTList getVTList(const EVT *VTs, unsigned NumVTs);
//===--------------------------------------------------------------------===//
// Node creation methods.
//
SDValue getConstant(uint64_t Val, EVT VT, bool isTarget = false);
SDValue getConstant(const APInt &Val, EVT VT, bool isTarget = false);
SDValue getConstant(const ConstantInt &Val, EVT VT, bool isTarget = false);
SDValue getIntPtrConstant(uint64_t Val, bool isTarget = false);
SDValue getTargetConstant(uint64_t Val, EVT VT) {
return getConstant(Val, VT, true);
}
SDValue getTargetConstant(const APInt &Val, EVT VT) {
return getConstant(Val, VT, true);
}
SDValue getTargetConstant(const ConstantInt &Val, EVT VT) {
return getConstant(Val, VT, true);
}
// The forms below that take a double should only be used for simple
// constants that can be exactly represented in VT. No checks are made.
SDValue getConstantFP(double Val, EVT VT, bool isTarget = false);
SDValue getConstantFP(const APFloat& Val, EVT VT, bool isTarget = false);
SDValue getConstantFP(const ConstantFP &CF, EVT VT, bool isTarget = false);
SDValue getTargetConstantFP(double Val, EVT VT) {
return getConstantFP(Val, VT, true);
}
SDValue getTargetConstantFP(const APFloat& Val, EVT VT) {
return getConstantFP(Val, VT, true);
}
SDValue getTargetConstantFP(const ConstantFP &Val, EVT VT) {
return getConstantFP(Val, VT, true);
}
SDValue getGlobalAddress(const GlobalValue *GV, DebugLoc DL, EVT VT,
int64_t offset = 0, bool isTargetGA = false,
unsigned char TargetFlags = 0);
SDValue getTargetGlobalAddress(const GlobalValue *GV, DebugLoc DL, EVT VT,
int64_t offset = 0,
unsigned char TargetFlags = 0) {
return getGlobalAddress(GV, DL, VT, offset, true, TargetFlags);
}
SDValue getFrameIndex(int FI, EVT VT, bool isTarget = false);
SDValue getTargetFrameIndex(int FI, EVT VT) {
return getFrameIndex(FI, VT, true);
}
SDValue getJumpTable(int JTI, EVT VT, bool isTarget = false,
unsigned char TargetFlags = 0);
SDValue getTargetJumpTable(int JTI, EVT VT, unsigned char TargetFlags = 0) {
return getJumpTable(JTI, VT, true, TargetFlags);
}
SDValue getConstantPool(const Constant *C, EVT VT,
unsigned Align = 0, int Offs = 0, bool isT=false,
unsigned char TargetFlags = 0);
SDValue getTargetConstantPool(const Constant *C, EVT VT,
unsigned Align = 0, int Offset = 0,
unsigned char TargetFlags = 0) {
return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
}
SDValue getConstantPool(MachineConstantPoolValue *C, EVT VT,
unsigned Align = 0, int Offs = 0, bool isT=false,
unsigned char TargetFlags = 0);
SDValue getTargetConstantPool(MachineConstantPoolValue *C,
EVT VT, unsigned Align = 0,
int Offset = 0, unsigned char TargetFlags=0) {
return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
}
// When generating a branch to a BB, we don't in general know enough
// to provide debug info for the BB at that time, so keep this one around.
SDValue getBasicBlock(MachineBasicBlock *MBB);
SDValue getBasicBlock(MachineBasicBlock *MBB, DebugLoc dl);
SDValue getExternalSymbol(const char *Sym, EVT VT);
SDValue getExternalSymbol(const char *Sym, DebugLoc dl, EVT VT);
SDValue getTargetExternalSymbol(const char *Sym, EVT VT,
unsigned char TargetFlags = 0);
SDValue getValueType(EVT);
SDValue getRegister(unsigned Reg, EVT VT);
SDValue getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label);
SDValue getBlockAddress(const BlockAddress *BA, EVT VT,
bool isTarget = false, unsigned char TargetFlags = 0);
SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N) {
return getNode(ISD::CopyToReg, dl, MVT::Other, Chain,
getRegister(Reg, N.getValueType()), N);
}
// This version of the getCopyToReg method takes an extra operand, which
// indicates that there is potentially an incoming glue value (if Glue is not
// null) and that there should be a glue result.
SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N,
SDValue Glue) {
SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Glue };
return getNode(ISD::CopyToReg, dl, VTs, Ops, Glue.getNode() ? 4 : 3);
}
// Similar to last getCopyToReg() except parameter Reg is a SDValue
SDValue getCopyToReg(SDValue Chain, DebugLoc dl, SDValue Reg, SDValue N,
SDValue Glue) {
SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
SDValue Ops[] = { Chain, Reg, N, Glue };
return getNode(ISD::CopyToReg, dl, VTs, Ops, Glue.getNode() ? 4 : 3);
}
SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, EVT VT) {
SDVTList VTs = getVTList(VT, MVT::Other);
SDValue Ops[] = { Chain, getRegister(Reg, VT) };
return getNode(ISD::CopyFromReg, dl, VTs, Ops, 2);
}
// This version of the getCopyFromReg method takes an extra operand, which
// indicates that there is potentially an incoming glue value (if Glue is not
// null) and that there should be a glue result.
SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, EVT VT,
SDValue Glue) {
SDVTList VTs = getVTList(VT, MVT::Other, MVT::Glue);
SDValue Ops[] = { Chain, getRegister(Reg, VT), Glue };
return getNode(ISD::CopyFromReg, dl, VTs, Ops, Glue.getNode() ? 3 : 2);
}
SDValue getCondCode(ISD::CondCode Cond);
/// Returns the ConvertRndSat Note: Avoid using this node because it may
/// disappear in the future and most targets don't support it.
SDValue getConvertRndSat(EVT VT, DebugLoc dl, SDValue Val, SDValue DTy,
SDValue STy,
SDValue Rnd, SDValue Sat, ISD::CvtCode Code);
/// getVectorShuffle - Return an ISD::VECTOR_SHUFFLE node. The number of
/// elements in VT, which must be a vector type, must match the number of
/// mask elements NumElts. A integer mask element equal to -1 is treated as
/// undefined.
SDValue getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1, SDValue N2,
const int *MaskElts);
/// getSExtOrTrunc - Convert Op, which must be of integer type, to the
/// integer type VT, by either sign-extending or truncating it.
SDValue getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT);
/// getZExtOrTrunc - Convert Op, which must be of integer type, to the
/// integer type VT, by either zero-extending or truncating it.
SDValue getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT);
/// getZeroExtendInReg - Return the expression required to zero extend the Op
/// value assuming it was the smaller SrcTy value.
SDValue getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT SrcTy);
/// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
SDValue getNOT(DebugLoc DL, SDValue Val, EVT VT);
/// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
/// a glue result (to ensure it's not CSE'd). CALLSEQ_START does not have a
/// useful DebugLoc.
SDValue getCALLSEQ_START(SDValue Chain, SDValue Op) {
SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
SDValue Ops[] = { Chain, Op };
return getNode(ISD::CALLSEQ_START, DebugLoc(), VTs, Ops, 2);
}
/// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
/// glue result (to ensure it's not CSE'd). CALLSEQ_END does not have
/// a useful DebugLoc.
SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2,
SDValue InGlue) {
SDVTList NodeTys = getVTList(MVT::Other, MVT::Glue);
SmallVector<SDValue, 4> Ops;
Ops.push_back(Chain);
Ops.push_back(Op1);
Ops.push_back(Op2);
Ops.push_back(InGlue);
return getNode(ISD::CALLSEQ_END, DebugLoc(), NodeTys, &Ops[0],
(unsigned)Ops.size() - (InGlue.getNode() == 0 ? 1 : 0));
}
/// getUNDEF - Return an UNDEF node. UNDEF does not have a useful DebugLoc.
SDValue getUNDEF(EVT VT) {
return getNode(ISD::UNDEF, DebugLoc(), VT);
}
/// getGLOBAL_OFFSET_TABLE - Return a GLOBAL_OFFSET_TABLE node. This does
/// not have a useful DebugLoc.
SDValue getGLOBAL_OFFSET_TABLE(EVT VT) {
return getNode(ISD::GLOBAL_OFFSET_TABLE, DebugLoc(), VT);
}
/// getNode - Gets or creates the specified node.
///
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT, SDValue N);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT, SDValue N1, SDValue N2);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
SDValue N1, SDValue N2, SDValue N3);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
SDValue N1, SDValue N2, SDValue N3, SDValue N4);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
SDValue N1, SDValue N2, SDValue N3, SDValue N4,
SDValue N5);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
const SDUse *Ops, unsigned NumOps);
SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
const SDValue *Ops, unsigned NumOps);
SDValue getNode(unsigned Opcode, DebugLoc DL,
const std::vector<EVT> &ResultTys,
const SDValue *Ops, unsigned NumOps);
SDValue getNode(unsigned Opcode, DebugLoc DL, const EVT *VTs, unsigned NumVTs,
const SDValue *Ops, unsigned NumOps);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
const SDValue *Ops, unsigned NumOps);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, SDValue N);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
SDValue N1, SDValue N2);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
SDValue N1, SDValue N2, SDValue N3);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
SDValue N1, SDValue N2, SDValue N3, SDValue N4);
SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
SDValue N1, SDValue N2, SDValue N3, SDValue N4,
SDValue N5);
/// getStackArgumentTokenFactor - Compute a TokenFactor to force all
/// the incoming stack arguments to be loaded from the stack. This is
/// used in tail call lowering to protect stack arguments from being
/// clobbered.
SDValue getStackArgumentTokenFactor(SDValue Chain);
SDValue getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
SDValue Size, unsigned Align, bool isVol, bool AlwaysInline,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo);
SDValue getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
SDValue Size, unsigned Align, bool isVol,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo);
SDValue getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
SDValue Size, unsigned Align, bool isVol,
MachinePointerInfo DstPtrInfo);
/// getSetCC - Helper function to make it easier to build SetCC's if you just
/// have an ISD::CondCode instead of an SDValue.
///
SDValue getSetCC(DebugLoc DL, EVT VT, SDValue LHS, SDValue RHS,
ISD::CondCode Cond) {
return getNode(ISD::SETCC, DL, VT, LHS, RHS, getCondCode(Cond));
}
/// getVSetCC - Helper function to make it easier to build VSetCC's nodes
/// if you just have an ISD::CondCode instead of an SDValue.
///
SDValue getVSetCC(DebugLoc DL, EVT VT, SDValue LHS, SDValue RHS,
ISD::CondCode Cond) {
return getNode(ISD::VSETCC, DL, VT, LHS, RHS, getCondCode(Cond));
}
/// getSelectCC - Helper function to make it easier to build SelectCC's if you
/// just have an ISD::CondCode instead of an SDValue.
///
SDValue getSelectCC(DebugLoc DL, SDValue LHS, SDValue RHS,
SDValue True, SDValue False, ISD::CondCode Cond) {
return getNode(ISD::SELECT_CC, DL, True.getValueType(),
LHS, RHS, True, False, getCondCode(Cond));
}
/// getVAArg - VAArg produces a result and token chain, and takes a pointer
/// and a source value as input.
SDValue getVAArg(EVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr,
SDValue SV, unsigned Align);
/// getAtomic - Gets a node for an atomic op, produces result and chain and
/// takes 3 operands
SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
SDValue Ptr, SDValue Cmp, SDValue Swp,
MachinePointerInfo PtrInfo, unsigned Alignment,
AtomicOrdering Ordering,
SynchronizationScope SynchScope);
SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
SDValue Ptr, SDValue Cmp, SDValue Swp,
MachineMemOperand *MMO,
AtomicOrdering Ordering,
SynchronizationScope SynchScope);
/// getAtomic - Gets a node for an atomic op, produces result and chain and
/// takes 2 operands.
SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
SDValue Ptr, SDValue Val, const Value* PtrVal,
unsigned Alignment,
AtomicOrdering Ordering,
SynchronizationScope SynchScope);
SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
SDValue Ptr, SDValue Val,
MachineMemOperand *MMO,
AtomicOrdering Ordering,
SynchronizationScope SynchScope);
/// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a
/// result and takes a list of operands. Opcode may be INTRINSIC_VOID,
/// INTRINSIC_W_CHAIN, or a target-specific opcode with a value not
/// less than FIRST_TARGET_MEMORY_OPCODE.
SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
const EVT *VTs, unsigned NumVTs,
const SDValue *Ops, unsigned NumOps,
EVT MemVT, MachinePointerInfo PtrInfo,
unsigned Align = 0, bool Vol = false,
bool ReadMem = true, bool WriteMem = true);
SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
const SDValue *Ops, unsigned NumOps,
EVT MemVT, MachinePointerInfo PtrInfo,
unsigned Align = 0, bool Vol = false,
bool ReadMem = true, bool WriteMem = true);
SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
const SDValue *Ops, unsigned NumOps,
EVT MemVT, MachineMemOperand *MMO);
/// getMergeValues - Create a MERGE_VALUES node from the given operands.
SDValue getMergeValues(const SDValue *Ops, unsigned NumOps, DebugLoc dl);
/// getLoad - Loads are not normal binary operators: their result type is not
/// determined by their operands, and they produce a value AND a token chain.
///
SDValue getLoad(EVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr,
MachinePointerInfo PtrInfo, bool isVolatile,
bool isNonTemporal, unsigned Alignment,
const MDNode *TBAAInfo = 0);
SDValue getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT,
SDValue Chain, SDValue Ptr, MachinePointerInfo PtrInfo,
EVT MemVT, bool isVolatile,
bool isNonTemporal, unsigned Alignment,
const MDNode *TBAAInfo = 0);
SDValue getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
SDValue Offset, ISD::MemIndexedMode AM);
SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
EVT VT, DebugLoc dl,
SDValue Chain, SDValue Ptr, SDValue Offset,
MachinePointerInfo PtrInfo, EVT MemVT,
bool isVolatile, bool isNonTemporal, unsigned Alignment,
const MDNode *TBAAInfo = 0);
SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
EVT VT, DebugLoc dl,
SDValue Chain, SDValue Ptr, SDValue Offset,
EVT MemVT, MachineMemOperand *MMO);
/// getStore - Helper function to build ISD::STORE nodes.
///
SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
MachinePointerInfo PtrInfo, bool isVolatile,
bool isNonTemporal, unsigned Alignment,
const MDNode *TBAAInfo = 0);
SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
MachineMemOperand *MMO);
SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
MachinePointerInfo PtrInfo, EVT TVT,
bool isNonTemporal, bool isVolatile,
unsigned Alignment,
const MDNode *TBAAInfo = 0);
SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
EVT TVT, MachineMemOperand *MMO);
SDValue getIndexedStore(SDValue OrigStoe, DebugLoc dl, SDValue Base,
SDValue Offset, ISD::MemIndexedMode AM);
/// getSrcValue - Construct a node to track a Value* through the backend.
SDValue getSrcValue(const Value *v);
/// getMDNode - Return an MDNodeSDNode which holds an MDNode.
SDValue getMDNode(const MDNode *MD);
/// getShiftAmountOperand - Return the specified value casted to
/// the target's desired shift amount type.
SDValue getShiftAmountOperand(EVT LHSTy, SDValue Op);
/// 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.
SDNode *UpdateNodeOperands(SDNode *N, SDValue Op);
SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2);
SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
SDValue Op3);
SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
SDValue Op3, SDValue Op4);
SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
SDValue Op3, SDValue Op4, SDValue Op5);
SDNode *UpdateNodeOperands(SDNode *N,
const SDValue *Ops, unsigned NumOps);
/// SelectNodeTo - These are used for target selectors to *mutate* the
/// specified node to have the specified return type, Target opcode, and
/// operands. Note that target opcodes are stored as
/// ~TargetOpcode in the node opcode field. The resultant node is returned.
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT, SDValue Op1);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
SDValue Op1, SDValue Op2);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
SDValue Op1, SDValue Op2, SDValue Op3);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
const SDValue *Ops, unsigned NumOps);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1, EVT VT2);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, const SDValue *Ops, unsigned NumOps);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, EVT VT3, const SDValue *Ops, unsigned NumOps);
SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, EVT VT1,
EVT VT2, EVT VT3, EVT VT4, const SDValue *Ops,
unsigned NumOps);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, SDValue Op1);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, SDValue Op1, SDValue Op2);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
EVT VT2, EVT VT3, SDValue Op1, SDValue Op2, SDValue Op3);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs,
const SDValue *Ops, unsigned NumOps);
/// MorphNodeTo - This *mutates* the specified node to have the specified
/// return type, opcode, and operands.
SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs,
const SDValue *Ops, unsigned NumOps);
/// getMachineNode - These are used for target selectors to create a new node
/// with specified return type(s), MachineInstr opcode, and operands.
///
/// Note that getMachineNode 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.
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
SDValue Op1);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
SDValue Op1, SDValue Op2);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
SDValue Op1, SDValue Op2, SDValue Op3);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
const SDValue *Ops, unsigned NumOps);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
SDValue Op1);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
EVT VT2, SDValue Op1, SDValue Op2);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
EVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
const SDValue *Ops, unsigned NumOps);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
EVT VT3, SDValue Op1, SDValue Op2);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
EVT VT3, SDValue Op1, SDValue Op2, SDValue Op3);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
EVT VT3, const SDValue *Ops, unsigned NumOps);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
EVT VT3, EVT VT4, const SDValue *Ops, unsigned NumOps);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl,
const std::vector<EVT> &ResultTys, const SDValue *Ops,
unsigned NumOps);
MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, SDVTList VTs,
const SDValue *Ops, unsigned NumOps);
/// getTargetExtractSubreg - A convenience function for creating
/// TargetInstrInfo::EXTRACT_SUBREG nodes.
SDValue getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
SDValue Operand);
/// getTargetInsertSubreg - A convenience function for creating
/// TargetInstrInfo::INSERT_SUBREG nodes.
SDValue getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
SDValue Operand, SDValue Subreg);
/// getNodeIfExists - Get the specified node if it's already available, or
/// else return NULL.
SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs,
const SDValue *Ops, unsigned NumOps);
/// getDbgValue - Creates a SDDbgValue node.
///
SDDbgValue *getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
DebugLoc DL, unsigned O);
SDDbgValue *getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
DebugLoc DL, unsigned O);
SDDbgValue *getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
DebugLoc DL, unsigned O);
/// DAGUpdateListener - Clients of various APIs that cause global effects on
/// the DAG can optionally implement this interface. This allows the clients
/// to handle the various sorts of updates that happen.
class DAGUpdateListener {
public:
virtual ~DAGUpdateListener();
/// NodeDeleted - The node N that was deleted and, if E is not null, an
/// equivalent node E that replaced it.
virtual void NodeDeleted(SDNode *N, SDNode *E) = 0;
/// NodeUpdated - The node N that was updated.
virtual void NodeUpdated(SDNode *N) = 0;
};
/// RemoveDeadNode - Remove the specified node from the system. If any of its
/// operands then becomes dead, remove them as well. Inform UpdateListener
/// for each node deleted.
void RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener = 0);
/// RemoveDeadNodes - This method deletes the unreachable nodes in the
/// given list, and any nodes that become unreachable as a result.
void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
DAGUpdateListener *UpdateListener = 0);
/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
/// This can cause recursive merging of nodes in the DAG. Use the first
/// version if 'From' is known to have a single result, use the second
/// if you have two nodes with identical results (or if 'To' has a superset
/// of the results of 'From'), use the third otherwise.
///
/// These methods all take an optional UpdateListener, which (if not null) is
/// informed about nodes that are deleted and modified due to recursive
/// changes in the dag.
///
/// These functions only replace all existing uses. It's possible that as
/// these replacements are being performed, CSE may cause the From node
/// to be given new uses. These new uses of From are left in place, and
/// not automatically transferred to To.
///
void ReplaceAllUsesWith(SDValue From, SDValue Op,
DAGUpdateListener *UpdateListener = 0);
void ReplaceAllUsesWith(SDNode *From, SDNode *To,
DAGUpdateListener *UpdateListener = 0);
void ReplaceAllUsesWith(SDNode *From, const SDValue *To,
DAGUpdateListener *UpdateListener = 0);
/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
/// uses of other values produced by From.Val alone.
void ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
DAGUpdateListener *UpdateListener = 0);
/// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but
/// for multiple values at once. This correctly handles the case where
/// there is an overlap between the From values and the To values.
void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To,
unsigned Num,
DAGUpdateListener *UpdateListener = 0);
/// AssignTopologicalOrder - Topological-sort the AllNodes list and a
/// assign a unique node id for each node in the DAG based on their
/// topological order. Returns the number of nodes.
unsigned AssignTopologicalOrder();
/// RepositionNode - Move node N in the AllNodes list to be immediately
/// before the given iterator Position. This may be used to update the
/// topological ordering when the list of nodes is modified.
void RepositionNode(allnodes_iterator Position, SDNode *N) {
AllNodes.insert(Position, AllNodes.remove(N));
}
/// isCommutativeBinOp - Returns true if the opcode is a commutative binary
/// operation.
static bool isCommutativeBinOp(unsigned Opcode) {
// FIXME: This should get its info from the td file, so that we can include
// target info.
switch (Opcode) {
case ISD::ADD:
case ISD::MUL:
case ISD::MULHU:
case ISD::MULHS:
case ISD::SMUL_LOHI:
case ISD::UMUL_LOHI:
case ISD::FADD:
case ISD::FMUL:
case ISD::AND:
case ISD::OR:
case ISD::XOR:
case ISD::SADDO:
case ISD::UADDO:
case ISD::ADDC:
case ISD::ADDE: return true;
default: return false;
}
}
/// AssignOrdering - Assign an order to the SDNode.
void AssignOrdering(const SDNode *SD, unsigned Order);
/// GetOrdering - Get the order for the SDNode.
unsigned GetOrdering(const SDNode *SD) const;
/// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
/// value is produced by SD.
void AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter);
/// GetDbgValues - Get the debug values which reference the given SDNode.
ArrayRef<SDDbgValue*> GetDbgValues(const SDNode* SD) {
return DbgInfo->getSDDbgValues(SD);
}
/// TransferDbgValues - Transfer SDDbgValues.
void TransferDbgValues(SDValue From, SDValue To);
/// hasDebugValues - Return true if there are any SDDbgValue nodes associated
/// with this SelectionDAG.
bool hasDebugValues() const { return !DbgInfo->empty(); }
SDDbgInfo::DbgIterator DbgBegin() { return DbgInfo->DbgBegin(); }
SDDbgInfo::DbgIterator DbgEnd() { return DbgInfo->DbgEnd(); }
SDDbgInfo::DbgIterator ByvalParmDbgBegin() {
return DbgInfo->ByvalParmDbgBegin();
}
SDDbgInfo::DbgIterator ByvalParmDbgEnd() {
return DbgInfo->ByvalParmDbgEnd();
}
void dump() const;
/// CreateStackTemporary - Create a stack temporary, suitable for holding the
/// specified value type. If minAlign is specified, the slot size will have
/// at least that alignment.
SDValue CreateStackTemporary(EVT VT, unsigned minAlign = 1);
/// CreateStackTemporary - Create a stack temporary suitable for holding
/// either of the specified value types.
SDValue CreateStackTemporary(EVT VT1, EVT VT2);
/// FoldConstantArithmetic -
SDValue FoldConstantArithmetic(unsigned Opcode,
EVT VT,
ConstantSDNode *Cst1,
ConstantSDNode *Cst2);
/// FoldSetCC - Constant fold a setcc to true or false.
SDValue FoldSetCC(EVT VT, SDValue N1,
SDValue N2, ISD::CondCode Cond, DebugLoc dl);
/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
/// use this predicate to simplify operations downstream.
bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const;
/// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
/// use this predicate to simplify operations downstream. Op and Mask are
/// known to be the same type.
bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0)
const;
/// 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. Targets can implement the computeMaskedBitsForTargetNode
/// method in the TargetLowering class to allow target nodes to be understood.
void ComputeMaskedBits(SDValue Op, const APInt &Mask, APInt &KnownZero,
APInt &KnownOne, unsigned Depth = 0) const;
/// 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. Targets can
/// implement the ComputeNumSignBitsForTarget method in the TargetLowering
/// class to allow target nodes to be understood.
unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const;
/// isBaseWithConstantOffset - Return true if the specified operand is an
/// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
/// ISD::OR with a ConstantSDNode that is guaranteed to have the same
/// semantics as an ADD. This handles the equivalence:
/// X|Cst == X+Cst iff X&Cst = 0.
bool isBaseWithConstantOffset(SDValue Op) const;
/// isKnownNeverNan - Test whether the given SDValue is known to never be NaN.
bool isKnownNeverNaN(SDValue Op) const;
/// isKnownNeverZero - Test whether the given SDValue is known to never be
/// positive or negative Zero.
bool isKnownNeverZero(SDValue Op) const;
/// isEqualTo - Test whether two SDValues are known to compare equal. This
/// is true if they are the same value, or if one is negative zero and the
/// other positive zero.
bool isEqualTo(SDValue A, SDValue B) const;
/// UnrollVectorOp - Utility function used by legalize and lowering to
/// "unroll" a vector operation by splitting out the scalars and operating
/// on each element individually. If the ResNE is 0, fully unroll the vector
/// op. If ResNE is less than the width of the vector op, unroll up to ResNE.
/// If the ResNE is greater than the width of the vector op, unroll the
/// vector op and fill the end of the resulting vector with UNDEFS.
SDValue UnrollVectorOp(SDNode *N, unsigned ResNE = 0);
/// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
/// location that is 'Dist' units away from the location that the 'Base' load
/// is loading from.
bool isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
unsigned Bytes, int Dist) const;
/// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
/// it cannot be inferred.
unsigned InferPtrAlignment(SDValue Ptr) const;
private:
bool RemoveNodeFromCSEMaps(SDNode *N);
void AddModifiedNodeToCSEMaps(SDNode *N, DAGUpdateListener *UpdateListener);
SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos);
SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2,
void *&InsertPos);
SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps,
void *&InsertPos);
void DeleteNodeNotInCSEMaps(SDNode *N);
void DeallocateNode(SDNode *N);
unsigned getEVTAlignment(EVT MemoryVT) const;
void allnodes_clear();
/// VTList - List of non-single value types.
std::vector<SDVTList> VTList;
/// CondCodeNodes - Maps to auto-CSE operations.
std::vector<CondCodeSDNode*> CondCodeNodes;
std::vector<SDNode*> ValueTypeNodes;
std::map<EVT, SDNode*, EVT::compareRawBits> ExtendedValueTypeNodes;
StringMap<SDNode*> ExternalSymbols;
std::map<std::pair<std::string, unsigned char>,SDNode*> TargetExternalSymbols;
};
template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
typedef SelectionDAG::allnodes_iterator nodes_iterator;
static nodes_iterator nodes_begin(SelectionDAG *G) {
return G->allnodes_begin();
}
static nodes_iterator nodes_end(SelectionDAG *G) {
return G->allnodes_end();
}
};
} // end namespace llvm
#endif
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