//===-- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ---*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
-//
+//
// This file declares the SDNode class and derived classes, which are used to
// represent the nodes and operations present in a SelectionDAG. These nodes
// and operations are machine code level operations, with some similarities to
// single token result. This is used to represent the fact that the operand
// operators are independent of each other.
TokenFactor,
-
+
// Various leaf nodes.
Constant, ConstantFP, GlobalAddress, FrameIndex, ConstantPool,
BasicBlock, ExternalSymbol,
// out.
ImplicitDef,
+ // UNDEF - An undefined node
+ UNDEF,
+
// EXTRACT_ELEMENT - This is used to get the first or second (determined by
// a Constant, which is required to be operand #1), element of the aggregate
// value specified as operand #0. This is only for use before legalization,
// Simple binary arithmetic operators.
ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
+ // MULHU/MULHS - Multiply high - Multiply two integers of type iN, producing
+ // an unsigned/signed value of type i[2*n], then return the top part.
+ MULHU, MULHS,
+
// Bitwise operators.
AND, OR, XOR, SHL, SRA, SRL,
// state.
SETCC,
- // addc - Three input, two output operator: (X, Y, C) -> (X+Y+C,
- // Cout). X,Y are integer inputs of agreeing size, C is a one bit
- // value, and two values are produced: the sum and a carry out.
- ADDC, SUBB,
+ // ADD_PARTS/SUB_PARTS - These operators take two logical operands which are
+ // broken into a multiple pieces each, and return the resulting pieces of
+ // doing an atomic add/sub operation. This is used to handle add/sub of
+ // expanded types. The operation ordering is:
+ // [Lo,Hi] = op [LoLHS,HiLHS], [LoRHS,HiRHS]
+ ADD_PARTS, SUB_PARTS,
+
+ // SHL_PARTS/SRA_PARTS/SRL_PARTS - These operators are used for expanded
+ // integer shift operations, just like ADD/SUB_PARTS. The operation
+ // ordering is:
+ // [Lo,Hi] = op [LoLHS,HiLHS], Amt
+ SHL_PARTS, SRA_PARTS, SRL_PARTS,
// Conversion operators. These are all single input single output
// operations. For all of these, the result type must be strictly
SINT_TO_FP,
UINT_TO_FP,
- // SIGN_EXTEND_INREG/ZERO_EXTEND_INREG - These operators atomically performs
- // a SHL/(SRA|SHL) pair to (sign|zero) extend a small value in a large
- // integer register (e.g. sign extending the low 8 bits of a 32-bit register
- // to fill the top 24 bits with the 7th bit). The size of the smaller type
- // is indicated by the ExtraValueType in the MVTSDNode for the operator.
+ // SIGN_EXTEND_INREG - This operator atomically performs a SHL/SRA pair to
+ // sign extend a small value in a large integer register (e.g. sign
+ // extending the low 8 bits of a 32-bit register to fill the top 24 bits
+ // with the 7th bit). The size of the smaller type is indicated by the
+ // ExtraValueType in the MVTSDNode for the operator.
SIGN_EXTEND_INREG,
- ZERO_EXTEND_INREG,
// FP_TO_[US]INT - Convert a floating point value to a signed or unsigned
// integer.
// FP_EXTEND - Extend a smaller FP type into a larger FP type.
FP_EXTEND,
+ // FNEG, FABS - Perform unary floating point negation and absolute value
+ // operations.
+ FNEG, FABS,
+
// Other operators. LOAD and STORE have token chains as their first
// operand, then the same operands as an LLVM load/store instruction.
LOAD, STORE,
// integer result type.
// ZEXTLOAD loads the integer operand and zero extends it to a larger
// integer result type.
- // EXTLOAD is used for two things: floating point extending loads, and
+ // EXTLOAD is used for two things: floating point extending loads, and
// integer extending loads where it doesn't matter what the high
// bits are set to. The code generator is allowed to codegen this
// into whichever operation is more efficient.
DYNAMIC_STACKALLOC,
// Control flow instructions. These all have token chains.
-
+
// BR - Unconditional branch. The first operand is the chain
// operand, the second is the MBB to branch to.
BR,
// to if the condition is true.
BRCOND,
+ // BRCONDTWOWAY - Two-way conditional branch. The first operand is the
+ // chain, the second is the condition, the third is the block to branch to
+ // if true, and the forth is the block to branch to if false. Targets
+ // usually do not implement this, preferring to have legalize demote the
+ // operation to BRCOND/BR pairs when necessary.
+ BRCONDTWOWAY,
+
// RET - Return from function. The first operand is the chain,
// and any subsequent operands are the return values for the
// function. This operation can have variable number of operands.
MEMSET,
MEMMOVE,
MEMCPY,
-
+
// ADJCALLSTACKDOWN/ADJCALLSTACKUP - These operators mark the beginning and
// end of a call sequence and indicate how much the stack pointer needs to
// be adjusted for that particular call. The first operand is a chain, the
ADJCALLSTACKDOWN, // Beginning of a call sequence
ADJCALLSTACKUP, // End of a call sequence
+ // PCMARKER - This corresponds to the pcmarker intrinsic.
+ PCMARKER,
// BUILTIN_OP_END - This must be the last enum value in this list.
BUILTIN_OP_END,
SETUGT, // 1 0 1 0 True if unordered or greater than
SETUGE, // 1 0 1 1 True if unordered, greater than, or equal
SETULT, // 1 1 0 0 True if unordered or less than
- SETULE, // 1 1 0 1 True if unordered, less than, or equal
+ SETULE, // 1 1 0 1 True if unordered, less than, or equal
SETUNE, // 1 1 1 0 True if unordered or not equal
SETTRUE, // 1 1 1 1 Always true (always folded)
// Don't care operations: undefined if the input is a nan.
SETGT, // 1 X 0 1 0 True if greater than
SETGE, // 1 X 0 1 1 True if greater than or equal
SETLT, // 1 X 1 0 0 True if less than
- SETLE, // 1 X 1 0 1 True if less than or equal
+ SETLE, // 1 X 1 0 1 True if less than or equal
SETNE, // 1 X 1 1 0 True if not equal
SETTRUE2, // 1 X 1 1 1 Always true (always folded)
// Forwarding methods - These forward to the corresponding methods in SDNode.
inline unsigned getOpcode() const;
+ inline unsigned getNodeDepth() const;
inline unsigned getNumOperands() const;
inline const SDOperand &getOperand(unsigned i) const;
/// SDNode - Represents one node in the SelectionDAG.
///
class SDNode {
- unsigned NodeType;
+ /// NodeType - The operation that this node performs.
+ ///
+ unsigned short NodeType;
+
+ /// NodeDepth - Node depth is defined as MAX(Node depth of children)+1. This
+ /// means that leaves have a depth of 1, things that use only leaves have a
+ /// depth of 2, etc.
+ unsigned short NodeDepth;
+
+ /// Operands - The values that are used by this operation.
+ ///
std::vector<SDOperand> Operands;
/// Values - The types of the values this node defines. SDNode's may define
bool use_empty() const { return Uses.empty(); }
bool hasOneUse() const { return Uses.size() == 1; }
+ /// getNodeDepth - Return the distance from this node to the leaves in the
+ /// graph. The leaves have a depth of 1.
+ unsigned getNodeDepth() const { return NodeDepth; }
+
typedef std::vector<SDNode*>::const_iterator use_iterator;
use_iterator use_begin() const { return Uses.begin(); }
use_iterator use_end() const { return Uses.end(); }
protected:
friend class SelectionDAG;
- SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT) {
+ SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT), NodeDepth(1) {
Values.reserve(1);
Values.push_back(VT);
}
-
SDNode(unsigned NT, SDOperand Op)
- : NodeType(NT) {
+ : NodeType(NT), NodeDepth(Op.Val->getNodeDepth()+1) {
Operands.reserve(1); Operands.push_back(Op);
Op.Val->Uses.push_back(this);
}
SDNode(unsigned NT, SDOperand N1, SDOperand N2)
: NodeType(NT) {
+ if (N1.Val->getNodeDepth() > N2.Val->getNodeDepth())
+ NodeDepth = N1.Val->getNodeDepth()+1;
+ else
+ NodeDepth = N2.Val->getNodeDepth()+1;
Operands.reserve(2); Operands.push_back(N1); Operands.push_back(N2);
N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
}
SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3)
: NodeType(NT) {
+ unsigned ND = N1.Val->getNodeDepth();
+ if (ND < N2.Val->getNodeDepth())
+ ND = N2.Val->getNodeDepth();
+ if (ND < N3.Val->getNodeDepth())
+ ND = N3.Val->getNodeDepth();
+ NodeDepth = ND+1;
+
Operands.reserve(3); Operands.push_back(N1); Operands.push_back(N2);
Operands.push_back(N3);
N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
}
SDNode(unsigned NT, std::vector<SDOperand> &Nodes) : NodeType(NT) {
Operands.swap(Nodes);
- for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ unsigned ND = 0;
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
Operands[i].Val->Uses.push_back(this);
+ if (ND < Operands[i].Val->getNodeDepth())
+ ND = Operands[i].Val->getNodeDepth();
+ }
+ NodeDepth = ND+1;
}
virtual ~SDNode() {
inline unsigned SDOperand::getOpcode() const {
return Val->getOpcode();
}
+inline unsigned SDOperand::getNodeDepth() const {
+ return Val->getNodeDepth();
+}
inline MVT::ValueType SDOperand::getValueType() const {
return Val->getValueType(ResNo);
}
bool isNullValue() const { return Value == 0; }
bool isAllOnesValue() const {
- return Value == (1ULL << MVT::getSizeInBits(getValueType(0)))-1;
+ int NumBits = MVT::getSizeInBits(getValueType(0));
+ if (NumBits == 64) return Value+1 == 0;
+ return Value == (1ULL << NumBits)-1;
}
static bool classof(const ConstantSDNode *) { return true; }
friend class SelectionDAG;
SetCCSDNode(ISD::CondCode Cond, SDOperand LHS, SDOperand RHS)
: SDNode(ISD::SETCC, LHS, RHS), Condition(Cond) {
- setValueTypes(MVT::i1);
}
public:
static bool classof(const MVTSDNode *) { return true; }
static bool classof(const SDNode *N) {
- return
+ return
N->getOpcode() == ISD::SIGN_EXTEND_INREG ||
- N->getOpcode() == ISD::ZERO_EXTEND_INREG ||
N->getOpcode() == ISD::FP_ROUND_INREG ||
N->getOpcode() == ISD::EXTLOAD ||
- N->getOpcode() == ISD::SEXTLOAD ||
+ N->getOpcode() == ISD::SEXTLOAD ||
N->getOpcode() == ISD::ZEXTLOAD ||
N->getOpcode() == ISD::TRUNCSTORE;
}
class SDNodeIterator : public forward_iterator<SDNode, ptrdiff_t> {
SDNode *Node;
unsigned Operand;
-
+
SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {}
public:
bool operator==(const SDNodeIterator& x) const {
Operand = I.Operand;
return *this;
}
-
+
pointer operator*() const {
return Node->getOperand(Operand).Val;
}
pointer operator->() const { return operator*(); }
-
+
SDNodeIterator& operator++() { // Preincrement
++Operand;
return *this;
}
SDNodeIterator operator++(int) { // Postincrement
- SDNodeIterator tmp = *this; ++*this; return tmp;
+ SDNodeIterator tmp = *this; ++*this; return tmp;
}
static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); }
typedef SDNode NodeType;
typedef SDNodeIterator ChildIteratorType;
static inline NodeType *getEntryNode(SDNode *N) { return N; }
- static inline ChildIteratorType child_begin(NodeType *N) {
+ static inline ChildIteratorType child_begin(NodeType *N) {
return SDNodeIterator::begin(N);
}
- static inline ChildIteratorType child_end(NodeType *N) {
+ static inline ChildIteratorType child_end(NodeType *N) {
return SDNodeIterator::end(N);
}
};
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