1 //===-- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the SDNode class and derived classes, which are used to
11 // represent the nodes and operations present in a SelectionDAG. These nodes
12 // and operations are machine code level operations, with some similarities to
13 // the GCC RTL representation.
15 // Clients should include the SelectionDAG.h file instead of this file directly.
17 //===----------------------------------------------------------------------===//
19 #ifndef LLVM_CODEGEN_SELECTIONDAGNODES_H
20 #define LLVM_CODEGEN_SELECTIONDAGNODES_H
22 #include "llvm/CodeGen/ValueTypes.h"
23 #include "llvm/ADT/GraphTraits.h"
24 #include "llvm/ADT/GraphTraits.h"
25 #include "llvm/ADT/iterator"
26 #include "llvm/Support/DataTypes.h"
34 class MachineBasicBlock;
36 template <typename T> struct simplify_type;
38 /// ISD namespace - This namespace contains an enum which represents all of the
39 /// SelectionDAG node types and value types.
42 //===--------------------------------------------------------------------===//
43 /// ISD::NodeType enum - This enum defines all of the operators valid in a
47 // EntryToken - This is the marker used to indicate the start of the region.
50 // Token factor - This node is takes multiple tokens as input and produces a
51 // single token result. This is used to represent the fact that the operand
52 // operators are independent of each other.
55 // Various leaf nodes.
56 Constant, ConstantFP, GlobalAddress, FrameIndex, ConstantPool,
57 BasicBlock, ExternalSymbol,
59 // CopyToReg - This node has chain and child nodes, and an associated
60 // register number. The instruction selector must guarantee that the value
61 // of the value node is available in the register stored in the RegSDNode
65 // CopyFromReg - This node indicates that the input value is a virtual or
66 // physical register that is defined outside of the scope of this
67 // SelectionDAG. The register is available from the RegSDNode object.
70 // ImplicitDef - This node indicates that the specified register is
71 // implicitly defined by some operation (e.g. its a live-in argument). This
72 // register is indicated in the RegSDNode object. The only operand to this
73 // is the token chain coming in, the only result is the token chain going
77 // EXTRACT_ELEMENT - This is used to get the first or second (determined by
78 // a Constant, which is required to be operand #1), element of the aggregate
79 // value specified as operand #0. This is only for use before legalization,
80 // for values that will be broken into multiple registers.
83 // BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways. Given
84 // two values of the same integer value type, this produces a value twice as
85 // big. Like EXTRACT_ELEMENT, this can only be used before legalization.
89 // Simple binary arithmetic operators.
90 ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
93 AND, OR, XOR, SHL, SRA, SRL,
98 // SetCC operator - This evaluates to a boolean (i1) true value if the
99 // condition is true. These nodes are instances of the
100 // SetCCSDNode class, which contains the condition code as extra
104 // ADD_PARTS/SUB_PARTS - These operators take two logical operands which are
105 // broken into a multiple pieces each, and return the resulting pieces of
106 // doing an atomic add/sub operation. This is used to handle add/sub of
107 // expanded types. The operation ordering is:
108 // [Lo,Hi] = op [LoLHS,HiLHS], [LoRHS,HiRHS]
109 ADD_PARTS, SUB_PARTS,
111 // Conversion operators. These are all single input single output
112 // operations. For all of these, the result type must be strictly
113 // wider or narrower (depending on the operation) than the source
116 // SIGN_EXTEND - Used for integer types, replicating the sign bit
120 // ZERO_EXTEND - Used for integer types, zeroing the new bits.
123 // TRUNCATE - Completely drop the high bits.
126 // [SU]INT_TO_FP - These operators convert integers (whose interpreted sign
127 // depends on the first letter) to floating point.
131 // SIGN_EXTEND_INREG/ZERO_EXTEND_INREG - These operators atomically performs
132 // a SHL/(SRA|SHL) pair to (sign|zero) extend a small value in a large
133 // integer register (e.g. sign extending the low 8 bits of a 32-bit register
134 // to fill the top 24 bits with the 7th bit). The size of the smaller type
135 // is indicated by the ExtraValueType in the MVTSDNode for the operator.
139 // FP_TO_[US]INT - Convert a floating point value to a signed or unsigned
144 // FP_ROUND - Perform a rounding operation from the current
145 // precision down to the specified precision (currently always 64->32).
148 // FP_ROUND_INREG - This operator takes a floating point register, and
149 // rounds it to a floating point value. It then promotes it and returns it
150 // in a register of the same size. This operation effectively just discards
151 // excess precision. The type to round down to is specified by the
152 // ExtraValueType in the MVTSDNode (currently always 64->32->64).
155 // FP_EXTEND - Extend a smaller FP type into a larger FP type.
158 // Other operators. LOAD and STORE have token chains as their first
159 // operand, then the same operands as an LLVM load/store instruction.
162 // EXTLOAD, SEXTLOAD, ZEXTLOAD - These three operators are instances of the
163 // MVTSDNode. All of these load a value from memory and extend them to a
164 // larger value (e.g. load a byte into a word register). All three of these
165 // have two operands, a chain and a pointer to load from. The extra value
166 // type is the source type being loaded.
168 // SEXTLOAD loads the integer operand and sign extends it to a larger
169 // integer result type.
170 // ZEXTLOAD loads the integer operand and zero extends it to a larger
171 // integer result type.
172 // EXTLOAD is used for two things: floating point extending loads, and
173 // integer extending loads where it doesn't matter what the high
174 // bits are set to. The code generator is allowed to codegen this
175 // into whichever operation is more efficient.
176 EXTLOAD, SEXTLOAD, ZEXTLOAD,
178 // TRUNCSTORE - This operators truncates (for integer) or rounds (for FP) a
179 // value and stores it to memory in one operation. This can be used for
180 // either integer or floating point operands, and the stored type
181 // represented as the 'extra' value type in the MVTSDNode representing the
182 // operator. This node has the same three operands as a standard store.
185 // DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned
186 // to a specified boundary. The first operand is the token chain, the
187 // second is the number of bytes to allocate, and the third is the alignment
191 // Control flow instructions. These all have token chains.
193 // BR - Unconditional branch. The first operand is the chain
194 // operand, the second is the MBB to branch to.
197 // BRCOND - Conditional branch. The first operand is the chain,
198 // the second is the condition, the third is the block to branch
199 // to if the condition is true.
202 // RET - Return from function. The first operand is the chain,
203 // and any subsequent operands are the return values for the
204 // function. This operation can have variable number of operands.
207 // CALL - Call to a function pointer. The first operand is the chain, the
208 // second is the destination function pointer (a GlobalAddress for a direct
209 // call). Arguments have already been lowered to explicit DAGs according to
210 // the calling convention in effect here.
213 // MEMSET/MEMCPY/MEMMOVE - The first operand is the chain, and the rest
214 // correspond to the operands of the LLVM intrinsic functions. The only
215 // result is a token chain. The alignment argument is guaranteed to be a
221 // ADJCALLSTACKDOWN/ADJCALLSTACKUP - These operators mark the beginning and
222 // end of a call sequence and indicate how much the stack pointer needs to
223 // be adjusted for that particular call. The first operand is a chain, the
224 // second is a ConstantSDNode of intptr type.
225 ADJCALLSTACKDOWN, // Beginning of a call sequence
226 ADJCALLSTACKUP, // End of a call sequence
229 // BUILTIN_OP_END - This must be the last enum value in this list.
233 //===--------------------------------------------------------------------===//
234 /// ISD::CondCode enum - These are ordered carefully to make the bitfields
235 /// below work out, when considering SETFALSE (something that never exists
236 /// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered
237 /// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal
238 /// to. If the "N" column is 1, the result of the comparison is undefined if
239 /// the input is a NAN.
241 /// All of these (except for the 'always folded ops') should be handled for
242 /// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT,
243 /// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used.
245 /// Note that these are laid out in a specific order to allow bit-twiddling
246 /// to transform conditions.
248 // Opcode N U L G E Intuitive operation
249 SETFALSE, // 0 0 0 0 Always false (always folded)
250 SETOEQ, // 0 0 0 1 True if ordered and equal
251 SETOGT, // 0 0 1 0 True if ordered and greater than
252 SETOGE, // 0 0 1 1 True if ordered and greater than or equal
253 SETOLT, // 0 1 0 0 True if ordered and less than
254 SETOLE, // 0 1 0 1 True if ordered and less than or equal
255 SETONE, // 0 1 1 0 True if ordered and operands are unequal
256 SETO, // 0 1 1 1 True if ordered (no nans)
257 SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y)
258 SETUEQ, // 1 0 0 1 True if unordered or equal
259 SETUGT, // 1 0 1 0 True if unordered or greater than
260 SETUGE, // 1 0 1 1 True if unordered, greater than, or equal
261 SETULT, // 1 1 0 0 True if unordered or less than
262 SETULE, // 1 1 0 1 True if unordered, less than, or equal
263 SETUNE, // 1 1 1 0 True if unordered or not equal
264 SETTRUE, // 1 1 1 1 Always true (always folded)
265 // Don't care operations: undefined if the input is a nan.
266 SETFALSE2, // 1 X 0 0 0 Always false (always folded)
267 SETEQ, // 1 X 0 0 1 True if equal
268 SETGT, // 1 X 0 1 0 True if greater than
269 SETGE, // 1 X 0 1 1 True if greater than or equal
270 SETLT, // 1 X 1 0 0 True if less than
271 SETLE, // 1 X 1 0 1 True if less than or equal
272 SETNE, // 1 X 1 1 0 True if not equal
273 SETTRUE2, // 1 X 1 1 1 Always true (always folded)
275 SETCC_INVALID, // Marker value.
278 /// isSignedIntSetCC - Return true if this is a setcc instruction that
279 /// performs a signed comparison when used with integer operands.
280 inline bool isSignedIntSetCC(CondCode Code) {
281 return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE;
284 /// isUnsignedIntSetCC - Return true if this is a setcc instruction that
285 /// performs an unsigned comparison when used with integer operands.
286 inline bool isUnsignedIntSetCC(CondCode Code) {
287 return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE;
290 /// isTrueWhenEqual - Return true if the specified condition returns true if
291 /// the two operands to the condition are equal. Note that if one of the two
292 /// operands is a NaN, this value is meaningless.
293 inline bool isTrueWhenEqual(CondCode Cond) {
294 return ((int)Cond & 1) != 0;
297 /// getUnorderedFlavor - This function returns 0 if the condition is always
298 /// false if an operand is a NaN, 1 if the condition is always true if the
299 /// operand is a NaN, and 2 if the condition is undefined if the operand is a
301 inline unsigned getUnorderedFlavor(CondCode Cond) {
302 return ((int)Cond >> 3) & 3;
305 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
306 /// 'op' is a valid SetCC operation.
307 CondCode getSetCCInverse(CondCode Operation, bool isInteger);
309 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
310 /// when given the operation for (X op Y).
311 CondCode getSetCCSwappedOperands(CondCode Operation);
313 /// getSetCCOrOperation - Return the result of a logical OR between different
314 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This
315 /// function returns SETCC_INVALID if it is not possible to represent the
316 /// resultant comparison.
317 CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger);
319 /// getSetCCAndOperation - Return the result of a logical AND between
320 /// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
321 /// function returns SETCC_INVALID if it is not possible to represent the
322 /// resultant comparison.
323 CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger);
324 } // end llvm::ISD namespace
327 //===----------------------------------------------------------------------===//
328 /// SDOperand - Unlike LLVM values, Selection DAG nodes may return multiple
329 /// values as the result of a computation. Many nodes return multiple values,
330 /// from loads (which define a token and a return value) to ADDC (which returns
331 /// a result and a carry value), to calls (which may return an arbitrary number
334 /// As such, each use of a SelectionDAG computation must indicate the node that
335 /// computes it as well as which return value to use from that node. This pair
336 /// of information is represented with the SDOperand value type.
340 SDNode *Val; // The node defining the value we are using.
341 unsigned ResNo; // Which return value of the node we are using.
343 SDOperand() : Val(0) {}
344 SDOperand(SDNode *val, unsigned resno) : Val(val), ResNo(resno) {}
346 bool operator==(const SDOperand &O) const {
347 return Val == O.Val && ResNo == O.ResNo;
349 bool operator!=(const SDOperand &O) const {
350 return !operator==(O);
352 bool operator<(const SDOperand &O) const {
353 return Val < O.Val || (Val == O.Val && ResNo < O.ResNo);
356 SDOperand getValue(unsigned R) const {
357 return SDOperand(Val, R);
360 /// getValueType - Return the ValueType of the referenced return value.
362 inline MVT::ValueType getValueType() const;
364 // Forwarding methods - These forward to the corresponding methods in SDNode.
365 inline unsigned getOpcode() const;
366 inline unsigned getNumOperands() const;
367 inline const SDOperand &getOperand(unsigned i) const;
369 /// hasOneUse - Return true if there is exactly one operation using this
370 /// result value of the defining operator.
371 inline bool hasOneUse() const;
375 /// simplify_type specializations - Allow casting operators to work directly on
376 /// SDOperands as if they were SDNode*'s.
377 template<> struct simplify_type<SDOperand> {
378 typedef SDNode* SimpleType;
379 static SimpleType getSimplifiedValue(const SDOperand &Val) {
380 return static_cast<SimpleType>(Val.Val);
383 template<> struct simplify_type<const SDOperand> {
384 typedef SDNode* SimpleType;
385 static SimpleType getSimplifiedValue(const SDOperand &Val) {
386 return static_cast<SimpleType>(Val.Val);
391 /// SDNode - Represents one node in the SelectionDAG.
395 std::vector<SDOperand> Operands;
397 /// Values - The types of the values this node defines. SDNode's may define
398 /// multiple values simultaneously.
399 std::vector<MVT::ValueType> Values;
401 /// Uses - These are all of the SDNode's that use a value produced by this
403 std::vector<SDNode*> Uses;
406 //===--------------------------------------------------------------------===//
409 unsigned getOpcode() const { return NodeType; }
411 size_t use_size() const { return Uses.size(); }
412 bool use_empty() const { return Uses.empty(); }
413 bool hasOneUse() const { return Uses.size() == 1; }
415 typedef std::vector<SDNode*>::const_iterator use_iterator;
416 use_iterator use_begin() const { return Uses.begin(); }
417 use_iterator use_end() const { return Uses.end(); }
419 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
420 /// indicated value. This method ignores uses of other values defined by this
422 bool hasNUsesOfValue(unsigned NUses, unsigned Value);
424 /// getNumOperands - Return the number of values used by this operation.
426 unsigned getNumOperands() const { return Operands.size(); }
428 const SDOperand &getOperand(unsigned Num) {
429 assert(Num < Operands.size() && "Invalid child # of SDNode!");
430 return Operands[Num];
433 const SDOperand &getOperand(unsigned Num) const {
434 assert(Num < Operands.size() && "Invalid child # of SDNode!");
435 return Operands[Num];
438 /// getNumValues - Return the number of values defined/returned by this
441 unsigned getNumValues() const { return Values.size(); }
443 /// getValueType - Return the type of a specified result.
445 MVT::ValueType getValueType(unsigned ResNo) const {
446 assert(ResNo < Values.size() && "Illegal result number!");
447 return Values[ResNo];
450 /// getOperationName - Return the opcode of this operation for printing.
452 const char* getOperationName() const;
455 static bool classof(const SDNode *) { return true; }
458 friend class SelectionDAG;
460 SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT) {
462 Values.push_back(VT);
465 SDNode(unsigned NT, SDOperand Op)
467 Operands.reserve(1); Operands.push_back(Op);
468 Op.Val->Uses.push_back(this);
470 SDNode(unsigned NT, SDOperand N1, SDOperand N2)
472 Operands.reserve(2); Operands.push_back(N1); Operands.push_back(N2);
473 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
475 SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3)
477 Operands.reserve(3); Operands.push_back(N1); Operands.push_back(N2);
478 Operands.push_back(N3);
479 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
480 N3.Val->Uses.push_back(this);
482 SDNode(unsigned NT, std::vector<SDOperand> &Nodes) : NodeType(NT) {
483 Operands.swap(Nodes);
484 for (unsigned i = 0, e = Operands.size(); i != e; ++i)
485 Operands[i].Val->Uses.push_back(this);
492 void setValueTypes(MVT::ValueType VT) {
494 Values.push_back(VT);
496 void setValueTypes(MVT::ValueType VT1, MVT::ValueType VT2) {
498 Values.push_back(VT1);
499 Values.push_back(VT2);
501 /// Note: this method destroys the vector passed in.
502 void setValueTypes(std::vector<MVT::ValueType> &VTs) {
503 std::swap(Values, VTs);
506 void removeUser(SDNode *User) {
507 // Remove this user from the operand's use list.
508 for (unsigned i = Uses.size(); ; --i) {
509 assert(i != 0 && "Didn't find user!");
510 if (Uses[i-1] == User) {
511 Uses.erase(Uses.begin()+i-1);
519 // Define inline functions from the SDOperand class.
521 inline unsigned SDOperand::getOpcode() const {
522 return Val->getOpcode();
524 inline MVT::ValueType SDOperand::getValueType() const {
525 return Val->getValueType(ResNo);
527 inline unsigned SDOperand::getNumOperands() const {
528 return Val->getNumOperands();
530 inline const SDOperand &SDOperand::getOperand(unsigned i) const {
531 return Val->getOperand(i);
533 inline bool SDOperand::hasOneUse() const {
534 return Val->hasNUsesOfValue(1, ResNo);
538 class ConstantSDNode : public SDNode {
541 friend class SelectionDAG;
542 ConstantSDNode(uint64_t val, MVT::ValueType VT)
543 : SDNode(ISD::Constant, VT), Value(val) {
547 uint64_t getValue() const { return Value; }
549 int64_t getSignExtended() const {
550 unsigned Bits = MVT::getSizeInBits(getValueType(0));
551 return ((int64_t)Value << (64-Bits)) >> (64-Bits);
554 bool isNullValue() const { return Value == 0; }
555 bool isAllOnesValue() const {
556 return Value == (1ULL << MVT::getSizeInBits(getValueType(0)))-1;
559 static bool classof(const ConstantSDNode *) { return true; }
560 static bool classof(const SDNode *N) {
561 return N->getOpcode() == ISD::Constant;
565 class ConstantFPSDNode : public SDNode {
568 friend class SelectionDAG;
569 ConstantFPSDNode(double val, MVT::ValueType VT)
570 : SDNode(ISD::ConstantFP, VT), Value(val) {
574 double getValue() const { return Value; }
576 /// isExactlyValue - We don't rely on operator== working on double values, as
577 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
578 /// As such, this method can be used to do an exact bit-for-bit comparison of
579 /// two floating point values.
580 bool isExactlyValue(double V) const {
594 static bool classof(const ConstantFPSDNode *) { return true; }
595 static bool classof(const SDNode *N) {
596 return N->getOpcode() == ISD::ConstantFP;
600 class GlobalAddressSDNode : public SDNode {
601 GlobalValue *TheGlobal;
603 friend class SelectionDAG;
604 GlobalAddressSDNode(const GlobalValue *GA, MVT::ValueType VT)
605 : SDNode(ISD::GlobalAddress, VT) {
606 TheGlobal = const_cast<GlobalValue*>(GA);
610 GlobalValue *getGlobal() const { return TheGlobal; }
612 static bool classof(const GlobalAddressSDNode *) { return true; }
613 static bool classof(const SDNode *N) {
614 return N->getOpcode() == ISD::GlobalAddress;
619 class FrameIndexSDNode : public SDNode {
622 friend class SelectionDAG;
623 FrameIndexSDNode(int fi, MVT::ValueType VT)
624 : SDNode(ISD::FrameIndex, VT), FI(fi) {}
627 int getIndex() const { return FI; }
629 static bool classof(const FrameIndexSDNode *) { return true; }
630 static bool classof(const SDNode *N) {
631 return N->getOpcode() == ISD::FrameIndex;
635 class ConstantPoolSDNode : public SDNode {
638 friend class SelectionDAG;
639 ConstantPoolSDNode(unsigned cpi, MVT::ValueType VT)
640 : SDNode(ISD::ConstantPool, VT), CPI(cpi) {}
643 unsigned getIndex() const { return CPI; }
645 static bool classof(const ConstantPoolSDNode *) { return true; }
646 static bool classof(const SDNode *N) {
647 return N->getOpcode() == ISD::ConstantPool;
651 class BasicBlockSDNode : public SDNode {
652 MachineBasicBlock *MBB;
654 friend class SelectionDAG;
655 BasicBlockSDNode(MachineBasicBlock *mbb)
656 : SDNode(ISD::BasicBlock, MVT::Other), MBB(mbb) {}
659 MachineBasicBlock *getBasicBlock() const { return MBB; }
661 static bool classof(const BasicBlockSDNode *) { return true; }
662 static bool classof(const SDNode *N) {
663 return N->getOpcode() == ISD::BasicBlock;
668 class RegSDNode : public SDNode {
671 friend class SelectionDAG;
672 RegSDNode(unsigned Opc, SDOperand Chain, SDOperand Src, unsigned reg)
673 : SDNode(Opc, Chain, Src), Reg(reg) {
675 RegSDNode(unsigned Opc, SDOperand Chain, unsigned reg)
676 : SDNode(Opc, Chain), Reg(reg) {}
679 unsigned getReg() const { return Reg; }
681 static bool classof(const RegSDNode *) { return true; }
682 static bool classof(const SDNode *N) {
683 return N->getOpcode() == ISD::CopyToReg ||
684 N->getOpcode() == ISD::CopyFromReg ||
685 N->getOpcode() == ISD::ImplicitDef;
689 class ExternalSymbolSDNode : public SDNode {
692 friend class SelectionDAG;
693 ExternalSymbolSDNode(const char *Sym, MVT::ValueType VT)
694 : SDNode(ISD::ExternalSymbol, VT), Symbol(Sym) {
698 const char *getSymbol() const { return Symbol; }
700 static bool classof(const ExternalSymbolSDNode *) { return true; }
701 static bool classof(const SDNode *N) {
702 return N->getOpcode() == ISD::ExternalSymbol;
706 class SetCCSDNode : public SDNode {
707 ISD::CondCode Condition;
709 friend class SelectionDAG;
710 SetCCSDNode(ISD::CondCode Cond, SDOperand LHS, SDOperand RHS)
711 : SDNode(ISD::SETCC, LHS, RHS), Condition(Cond) {
715 ISD::CondCode getCondition() const { return Condition; }
717 static bool classof(const SetCCSDNode *) { return true; }
718 static bool classof(const SDNode *N) {
719 return N->getOpcode() == ISD::SETCC;
723 /// MVTSDNode - This class is used for operators that require an extra
724 /// value-type to be kept with the node.
725 class MVTSDNode : public SDNode {
726 MVT::ValueType ExtraValueType;
728 friend class SelectionDAG;
729 MVTSDNode(unsigned Opc, MVT::ValueType VT1, SDOperand Op0, MVT::ValueType EVT)
730 : SDNode(Opc, Op0), ExtraValueType(EVT) {
733 MVTSDNode(unsigned Opc, MVT::ValueType VT1, MVT::ValueType VT2,
734 SDOperand Op0, SDOperand Op1, MVT::ValueType EVT)
735 : SDNode(Opc, Op0, Op1), ExtraValueType(EVT) {
736 setValueTypes(VT1, VT2);
738 MVTSDNode(unsigned Opc, MVT::ValueType VT,
739 SDOperand Op0, SDOperand Op1, SDOperand Op2, MVT::ValueType EVT)
740 : SDNode(Opc, Op0, Op1, Op2), ExtraValueType(EVT) {
745 MVT::ValueType getExtraValueType() const { return ExtraValueType; }
747 static bool classof(const MVTSDNode *) { return true; }
748 static bool classof(const SDNode *N) {
750 N->getOpcode() == ISD::SIGN_EXTEND_INREG ||
751 N->getOpcode() == ISD::ZERO_EXTEND_INREG ||
752 N->getOpcode() == ISD::FP_ROUND_INREG ||
753 N->getOpcode() == ISD::EXTLOAD ||
754 N->getOpcode() == ISD::SEXTLOAD ||
755 N->getOpcode() == ISD::ZEXTLOAD ||
756 N->getOpcode() == ISD::TRUNCSTORE;
760 class SDNodeIterator : public forward_iterator<SDNode, ptrdiff_t> {
764 SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {}
766 bool operator==(const SDNodeIterator& x) const {
767 return Operand == x.Operand;
769 bool operator!=(const SDNodeIterator& x) const { return !operator==(x); }
771 const SDNodeIterator &operator=(const SDNodeIterator &I) {
772 assert(I.Node == Node && "Cannot assign iterators to two different nodes!");
777 pointer operator*() const {
778 return Node->getOperand(Operand).Val;
780 pointer operator->() const { return operator*(); }
782 SDNodeIterator& operator++() { // Preincrement
786 SDNodeIterator operator++(int) { // Postincrement
787 SDNodeIterator tmp = *this; ++*this; return tmp;
790 static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); }
791 static SDNodeIterator end (SDNode *N) {
792 return SDNodeIterator(N, N->getNumOperands());
795 unsigned getOperand() const { return Operand; }
796 const SDNode *getNode() const { return Node; }
799 template <> struct GraphTraits<SDNode*> {
800 typedef SDNode NodeType;
801 typedef SDNodeIterator ChildIteratorType;
802 static inline NodeType *getEntryNode(SDNode *N) { return N; }
803 static inline ChildIteratorType child_begin(NodeType *N) {
804 return SDNodeIterator::begin(N);
806 static inline ChildIteratorType child_end(NodeType *N) {
807 return SDNodeIterator::end(N);
814 } // end llvm namespace