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llvm-6502/include/llvm/CodeGen/SelectionDAG.h
Duncan Sands 276dcbdc8d Introduce a new node for holding call argument 
flags.  This is needed by the new legalize types
infrastructure which wants to expand the 64 bit
constants previously used to hold the flags on
32 bit machines.  There are two functional changes:
(1) in LowerArguments, if a parameter has the zext
attribute set then that is marked in the flags;
before it was being ignored; (2) PPC had some bogus
code for handling two word arguments when using the
ELF 32 ABI, which was hard to convert because of
the bogusness.  As suggested by the original author
(Nicolas Geoffray), I've disabled it for the moment.
Tested with "make check" and the Ada ACATS testsuite.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48640 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-21 09:14:45 +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/FoldingSet.h"
#include "llvm/ADT/ilist"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include <list>
#include <vector>
#include <map>
#include <set>
#include <string>
namespace llvm {
class AliasAnalysis;
class TargetLowering;
class TargetMachine;
class MachineModuleInfo;
class MachineFunction;
class MachineConstantPoolValue;
/// 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 {
TargetLowering &TLI;
MachineFunction &MF;
MachineModuleInfo *MMI;
/// Root - The root of the entire DAG. EntryNode - The starting token.
SDOperand Root, EntryNode;
/// AllNodes - A linked list of nodes in the current DAG.
ilist<SDNode> AllNodes;
/// CSEMap - This structure is used to memoize nodes, automatically performing
/// CSE with existing nodes with a duplicate is requested.
FoldingSet<SDNode> CSEMap;
public:
SelectionDAG(TargetLowering &tli, MachineFunction &mf, MachineModuleInfo *mmi)
: TLI(tli), MF(mf), MMI(mmi) {
EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
}
~SelectionDAG();
MachineFunction &getMachineFunction() const { return MF; }
const TargetMachine &getTarget() const;
TargetLowering &getTargetLoweringInfo() const { return TLI; }
MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
/// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
///
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);
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(); }
/// getRoot - Return the root tag of the SelectionDAG.
///
const SDOperand &getRoot() const { return Root; }
/// getEntryNode - Return the token chain corresponding to the entry of the
/// function.
const SDOperand &getEntryNode() const { return EntryNode; }
/// setRoot - Set the current root tag of the SelectionDAG.
///
const SDOperand &setRoot(SDOperand N) { return Root = N; }
/// Combine - This iterates over the nodes in the SelectionDAG, folding
/// certain types of nodes together, or eliminating superfluous nodes. When
/// the AfterLegalize argument is set to 'true', Combine takes care not to
/// generate any nodes that will be illegal on the target.
void Combine(bool AfterLegalize, AliasAnalysis &AA);
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
/// only uses types natively supported by the target.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
void 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();
/// 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(MVT::ValueType VT);
SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2);
SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2,MVT::ValueType VT3);
SDVTList getVTList(const MVT::ValueType *VTs, unsigned NumVTs);
/// getNodeValueTypes - These are obsolete, use getVTList instead.
const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT) {
return getVTList(VT).VTs;
}
const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,
MVT::ValueType VT2) {
return getVTList(VT1, VT2).VTs;
}
const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,MVT::ValueType VT2,
MVT::ValueType VT3) {
return getVTList(VT1, VT2, VT3).VTs;
}
const MVT::ValueType *getNodeValueTypes(std::vector<MVT::ValueType> &VTList) {
return getVTList(&VTList[0], VTList.size()).VTs;
}
//===--------------------------------------------------------------------===//
// Node creation methods.
//
SDOperand getString(const std::string &Val);
SDOperand getConstant(uint64_t Val, MVT::ValueType VT, bool isTarget = false);
SDOperand getConstant(const APInt &Val, MVT::ValueType VT, bool isTarget = false);
SDOperand getIntPtrConstant(uint64_t Val, bool isTarget = false);
SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT) {
return getConstant(Val, VT, true);
}
SDOperand getTargetConstant(const APInt &Val, MVT::ValueType VT) {
return getConstant(Val, VT, true);
}
SDOperand getConstantFP(double Val, MVT::ValueType VT, bool isTarget = false);
SDOperand getConstantFP(const APFloat& Val, MVT::ValueType VT,
bool isTarget = false);
SDOperand getTargetConstantFP(double Val, MVT::ValueType VT) {
return getConstantFP(Val, VT, true);
}
SDOperand getTargetConstantFP(const APFloat& Val, MVT::ValueType VT) {
return getConstantFP(Val, VT, true);
}
SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
int offset = 0, bool isTargetGA = false);
SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
int offset = 0) {
return getGlobalAddress(GV, VT, offset, true);
}
SDOperand getFrameIndex(int FI, MVT::ValueType VT, bool isTarget = false);
SDOperand getTargetFrameIndex(int FI, MVT::ValueType VT) {
return getFrameIndex(FI, VT, true);
}
SDOperand getJumpTable(int JTI, MVT::ValueType VT, bool isTarget = false);
SDOperand getTargetJumpTable(int JTI, MVT::ValueType VT) {
return getJumpTable(JTI, VT, true);
}
SDOperand getConstantPool(Constant *C, MVT::ValueType VT,
unsigned Align = 0, int Offs = 0, bool isT=false);
SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT,
unsigned Align = 0, int Offset = 0) {
return getConstantPool(C, VT, Align, Offset, true);
}
SDOperand getConstantPool(MachineConstantPoolValue *C, MVT::ValueType VT,
unsigned Align = 0, int Offs = 0, bool isT=false);
SDOperand getTargetConstantPool(MachineConstantPoolValue *C,
MVT::ValueType VT, unsigned Align = 0,
int Offset = 0) {
return getConstantPool(C, VT, Align, Offset, true);
}
SDOperand getBasicBlock(MachineBasicBlock *MBB);
SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
SDOperand getArgFlags(ISD::ArgFlagsTy Flags);
SDOperand getValueType(MVT::ValueType);
SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
return getNode(ISD::CopyToReg, 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 flag value (if Flag is not
// null) and that there should be a flag result.
SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
SDOperand Flag) {
const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
SDOperand Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
}
// Similar to last getCopyToReg() except parameter Reg is a SDOperand
SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
SDOperand Flag) {
const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
SDOperand Ops[] = { Chain, Reg, N, Flag };
return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
}
SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other);
SDOperand Ops[] = { Chain, getRegister(Reg, VT) };
return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2);
}
// This version of the getCopyFromReg method takes an extra operand, which
// indicates that there is potentially an incoming flag value (if Flag is not
// null) and that there should be a flag result.
SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
SDOperand Flag) {
const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag);
SDOperand Ops[] = { Chain, getRegister(Reg, VT), Flag };
return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.Val ? 3 : 2);
}
SDOperand getCondCode(ISD::CondCode Cond);
/// getZeroExtendInReg - Return the expression required to zero extend the Op
/// value assuming it was the smaller SrcTy value.
SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
/// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
/// a flag result (to ensure it's not CSE'd).
SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
SDOperand Ops[] = { Chain, Op };
return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2);
}
/// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
/// flag result (to ensure it's not CSE'd).
SDOperand getCALLSEQ_END(SDOperand Chain, SDOperand Op1, SDOperand Op2,
SDOperand InFlag) {
SDVTList NodeTys = getVTList(MVT::Other, MVT::Flag);
SmallVector<SDOperand, 4> Ops;
Ops.push_back(Chain);
Ops.push_back(Op1);
Ops.push_back(Op2);
Ops.push_back(InFlag);
return getNode(ISD::CALLSEQ_END, NodeTys, &Ops[0],
Ops.size() - (InFlag.Val == 0 ? 1 : 0));
}
/// getNode - Gets or creates the specified node.
///
SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
SDOperand N5);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
const SDOperand *Ops, unsigned NumOps);
SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
const SDOperand *Ops, unsigned NumOps);
SDOperand getNode(unsigned Opcode, const MVT::ValueType *VTs, unsigned NumVTs,
const SDOperand *Ops, unsigned NumOps);
SDOperand getNode(unsigned Opcode, SDVTList VTs);
SDOperand getNode(unsigned Opcode, SDVTList VTs, SDOperand N);
SDOperand getNode(unsigned Opcode, SDVTList VTs,
SDOperand N1, SDOperand N2);
SDOperand getNode(unsigned Opcode, SDVTList VTs,
SDOperand N1, SDOperand N2, SDOperand N3);
SDOperand getNode(unsigned Opcode, SDVTList VTs,
SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
SDOperand getNode(unsigned Opcode, SDVTList VTs,
SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
SDOperand N5);
SDOperand getNode(unsigned Opcode, SDVTList VTs,
const SDOperand *Ops, unsigned NumOps);
SDOperand getMemcpy(SDOperand Chain, SDOperand Dest, SDOperand Src,
SDOperand Size, SDOperand Align,
SDOperand AlwaysInline);
SDOperand getMemmove(SDOperand Chain, SDOperand Dest, SDOperand Src,
SDOperand Size, SDOperand Align,
SDOperand AlwaysInline);
SDOperand getMemset(SDOperand Chain, SDOperand Dest, SDOperand Src,
SDOperand Size, SDOperand Align,
SDOperand AlwaysInline);
/// getSetCC - Helper function to make it easier to build SetCC's if you just
/// have an ISD::CondCode instead of an SDOperand.
///
SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
ISD::CondCode Cond) {
return getNode(ISD::SETCC, 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 SDOperand.
///
SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
SDOperand True, SDOperand False, ISD::CondCode Cond) {
return getNode(ISD::SELECT_CC, 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.
SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
SDOperand SV);
/// getAtomic - Gets a node for an atomic op, produces result and chain, takes
// 3 operands
SDOperand getAtomic(unsigned Opcode, SDOperand Chain, SDOperand Ptr,
SDOperand Cmp, SDOperand Swp, MVT::ValueType VT);
/// getAtomic - Gets a node for an atomic op, produces result and chain, takes
// 2 operands
SDOperand getAtomic(unsigned Opcode, SDOperand Chain, SDOperand Ptr,
SDOperand Val, MVT::ValueType VT);
/// 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.
///
SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
const Value *SV, int SVOffset, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr, const Value *SV,
int SVOffset, MVT::ValueType EVT, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM);
/// getStore - Helper function to build ISD::STORE nodes.
///
SDOperand getStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
const Value *SV, int SVOffset, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getTruncStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
const Value *SV, int SVOffset, MVT::ValueType TVT,
bool isVolatile=false, unsigned Alignment=0);
SDOperand getIndexedStore(SDOperand OrigStoe, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM);
// getSrcValue - Construct a node to track a Value* through the backend.
SDOperand getSrcValue(const Value *v);
// getMemOperand - Construct a node to track a memory reference
// through the backend.
SDOperand getMemOperand(const MemOperand &MO);
/// UpdateNodeOperands - *Mutate* the specified node in-place to have the
/// specified operands. If the resultant node already exists in the DAG,
/// this does not modify the specified node, instead it returns the node that
/// already exists. If the resultant node does not exist in the DAG, the
/// input node is returned. As a degenerate case, if you specify the same
/// input operands as the node already has, the input node is returned.
SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
SDOperand Op3);
SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
SDOperand Op3, SDOperand Op4);
SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
SDOperand Op3, SDOperand Op4, SDOperand Op5);
SDOperand UpdateNodeOperands(SDOperand N, SDOperand *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
/// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
/// of the resultant node is returned.
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
SDOperand Op1);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2, SDOperand Op3);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
const SDOperand *Ops, unsigned NumOps);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
SDOperand Op3);
/// 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 *getTargetNode(unsigned Opcode, MVT::ValueType VT);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
SDOperand Op1, SDOperand Op2, SDOperand Op3);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
const SDOperand *Ops, unsigned NumOps);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
SDOperand Op3);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2,
const SDOperand *Ops, unsigned NumOps);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
SDOperand Op1, SDOperand Op2);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
SDOperand Op1, SDOperand Op2, SDOperand Op3);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
const SDOperand *Ops, unsigned NumOps);
SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
MVT::ValueType VT2, MVT::ValueType VT3,
MVT::ValueType VT4,
const SDOperand *Ops, unsigned NumOps);
SDNode *getTargetNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
const SDOperand *Ops, unsigned NumOps);
/// 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();
virtual void NodeDeleted(SDNode *N) = 0;
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);
/// 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, 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.
///
void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
DAGUpdateListener *UpdateListener = 0);
void ReplaceAllUsesWith(SDNode *From, SDNode *To,
DAGUpdateListener *UpdateListener = 0);
void ReplaceAllUsesWith(SDNode *From, const SDOperand *To,
DAGUpdateListener *UpdateListener = 0);
/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
/// uses of other values produced by From.Val alone.
void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
DAGUpdateListener *UpdateListener = 0);
/// AssignNodeIds - Assign a unique node id for each node in the DAG based on
/// their allnodes order. It returns the maximum id.
unsigned AssignNodeIds();
/// 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 AssignTopologicalOrder(std::vector<SDNode*> &TopOrder);
/// 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::ADDC:
case ISD::ADDE: return true;
default: return false;
}
}
void dump() const;
/// CreateStackTemporary - Create a stack temporary, suitable for holding the
/// specified value type.
SDOperand CreateStackTemporary(MVT::ValueType VT);
/// FoldSetCC - Constant fold a setcc to true or false.
SDOperand FoldSetCC(MVT::ValueType VT, SDOperand N1,
SDOperand N2, ISD::CondCode Cond);
/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
/// use this predicate to simplify operations downstream.
bool SignBitIsZero(SDOperand 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(SDOperand 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(SDOperand 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(SDOperand Op, unsigned Depth = 0) const;
/// isVerifiedDebugInfoDesc - Returns true if the specified SDOperand has
/// been verified as a debug information descriptor.
bool isVerifiedDebugInfoDesc(SDOperand Op) const;
private:
void RemoveNodeFromCSEMaps(SDNode *N);
SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op, void *&InsertPos);
SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2,
void *&InsertPos);
SDNode *FindModifiedNodeSlot(SDNode *N, const SDOperand *Ops, unsigned NumOps,
void *&InsertPos);
void DeleteNodeNotInCSEMaps(SDNode *N);
// List of non-single value types.
std::list<std::vector<MVT::ValueType> > VTList;
// Maps to auto-CSE operations.
std::vector<CondCodeSDNode*> CondCodeNodes;
std::vector<SDNode*> ValueTypeNodes;
std::map<MVT::ValueType, SDNode*> ExtendedValueTypeNodes;
std::map<std::string, SDNode*> ExternalSymbols;
std::map<std::string, SDNode*> TargetExternalSymbols;
std::map<std::string, StringSDNode*> StringNodes;
};
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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