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/Value.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;
37 template <typename T> struct ilist_traits;
38 template<typename NodeTy, typename Traits> class iplist;
39 template<typename NodeTy> class ilist_iterator;
41 /// ISD namespace - This namespace contains an enum which represents all of the
42 /// SelectionDAG node types and value types.
45 //===--------------------------------------------------------------------===//
46 /// ISD::NodeType enum - This enum defines all of the operators valid in a
50 // DELETED_NODE - This is an illegal flag value that is used to catch
51 // errors. This opcode is not a legal opcode for any node.
54 // EntryToken - This is the marker used to indicate the start of the region.
57 // Token factor - This node takes multiple tokens as input and produces a
58 // single token result. This is used to represent the fact that the operand
59 // operators are independent of each other.
62 // AssertSext, AssertZext - These nodes record if a register contains a
63 // value that has already been zero or sign extended from a narrower type.
64 // These nodes take two operands. The first is the node that has already
65 // been extended, and the second is a value type node indicating the width
67 AssertSext, AssertZext,
69 // Various leaf nodes.
70 STRING, BasicBlock, VALUETYPE, CONDCODE, Register,
72 GlobalAddress, FrameIndex, JumpTable, ConstantPool, ExternalSymbol,
74 // TargetConstant* - Like Constant*, but the DAG does not do any folding or
75 // simplification of the constant.
79 // TargetGlobalAddress - Like GlobalAddress, but the DAG does no folding or
80 // anything else with this node, and this is valid in the target-specific
81 // dag, turning into a GlobalAddress operand.
88 /// RESULT = INTRINSIC_WO_CHAIN(INTRINSICID, arg1, arg2, ...)
89 /// This node represents a target intrinsic function with no side effects.
90 /// The first operand is the ID number of the intrinsic from the
91 /// llvm::Intrinsic namespace. The operands to the intrinsic follow. The
92 /// node has returns the result of the intrinsic.
95 /// RESULT,OUTCHAIN = INTRINSIC_W_CHAIN(INCHAIN, INTRINSICID, arg1, ...)
96 /// This node represents a target intrinsic function with side effects that
97 /// returns a result. The first operand is a chain pointer. The second is
98 /// the ID number of the intrinsic from the llvm::Intrinsic namespace. The
99 /// operands to the intrinsic follow. The node has two results, the result
100 /// of the intrinsic and an output chain.
103 /// OUTCHAIN = INTRINSIC_VOID(INCHAIN, INTRINSICID, arg1, arg2, ...)
104 /// This node represents a target intrinsic function with side effects that
105 /// does not return a result. The first operand is a chain pointer. The
106 /// second is the ID number of the intrinsic from the llvm::Intrinsic
107 /// namespace. The operands to the intrinsic follow.
110 // CopyToReg - This node has three operands: a chain, a register number to
111 // set to this value, and a value.
114 // CopyFromReg - This node indicates that the input value is a virtual or
115 // physical register that is defined outside of the scope of this
116 // SelectionDAG. The register is available from the RegSDNode object.
119 // UNDEF - An undefined node
122 /// FORMAL_ARGUMENTS(CHAIN, CC#, ISVARARG) - This node represents the formal
123 /// arguments for a function. CC# is a Constant value indicating the
124 /// calling convention of the function, and ISVARARG is a flag that
125 /// indicates whether the function is varargs or not. This node has one
126 /// result value for each incoming argument, plus one for the output chain.
127 /// It must be custom legalized.
131 /// RV1, RV2...RVn, CHAIN = CALL(CHAIN, CC#, ISVARARG, ISTAILCALL, CALLEE,
132 /// ARG0, SIGN0, ARG1, SIGN1, ... ARGn, SIGNn)
133 /// This node represents a fully general function call, before the legalizer
134 /// runs. This has one result value for each argument / signness pair, plus
135 /// a chain result. It must be custom legalized.
138 // EXTRACT_ELEMENT - This is used to get the first or second (determined by
139 // a Constant, which is required to be operand #1), element of the aggregate
140 // value specified as operand #0. This is only for use before legalization,
141 // for values that will be broken into multiple registers.
144 // BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways. Given
145 // two values of the same integer value type, this produces a value twice as
146 // big. Like EXTRACT_ELEMENT, this can only be used before legalization.
149 // MERGE_VALUES - This node takes multiple discrete operands and returns
150 // them all as its individual results. This nodes has exactly the same
151 // number of inputs and outputs, and is only valid before legalization.
152 // This node is useful for some pieces of the code generator that want to
153 // think about a single node with multiple results, not multiple nodes.
156 // Simple integer binary arithmetic operators.
157 ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
159 // Carry-setting nodes for multiple precision addition and subtraction.
160 // These nodes take two operands of the same value type, and produce two
161 // results. The first result is the normal add or sub result, the second
162 // result is the carry flag result.
165 // Carry-using nodes for multiple precision addition and subtraction. These
166 // nodes take three operands: The first two are the normal lhs and rhs to
167 // the add or sub, and the third is the input carry flag. These nodes
168 // produce two results; the normal result of the add or sub, and the output
169 // carry flag. These nodes both read and write a carry flag to allow them
170 // to them to be chained together for add and sub of arbitrarily large
174 // Simple binary floating point operators.
175 FADD, FSUB, FMUL, FDIV, FREM,
177 // FCOPYSIGN(X, Y) - Return the value of X with the sign of Y. NOTE: This
178 // DAG node does not require that X and Y have the same type, just that they
179 // are both floating point. X and the result must have the same type.
180 // FCOPYSIGN(f32, f64) is allowed.
183 /// VBUILD_VECTOR(ELT1, ELT2, ELT3, ELT4,..., COUNT,TYPE) - Return a vector
184 /// with the specified, possibly variable, elements. The number of elements
185 /// is required to be a power of two.
188 /// BUILD_VECTOR(ELT1, ELT2, ELT3, ELT4,...) - Return a vector
189 /// with the specified, possibly variable, elements. The number of elements
190 /// is required to be a power of two.
193 /// VINSERT_VECTOR_ELT(VECTOR, VAL, IDX, COUNT,TYPE) - Given a vector
194 /// VECTOR, an element ELEMENT, and a (potentially variable) index IDX,
195 /// return an vector with the specified element of VECTOR replaced with VAL.
196 /// COUNT and TYPE specify the type of vector, as is standard for V* nodes.
199 /// INSERT_VECTOR_ELT(VECTOR, VAL, IDX) - Returns VECTOR (a legal packed
200 /// type) with the element at IDX replaced with VAL.
203 /// VEXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR
204 /// (an MVT::Vector value) identified by the (potentially variable) element
208 /// EXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR
209 /// (a legal packed type vector) identified by the (potentially variable)
210 /// element number IDX.
213 /// VVECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC, COUNT,TYPE) - Returns a vector,
214 /// of the same type as VEC1/VEC2. SHUFFLEVEC is a VBUILD_VECTOR of
215 /// constant int values that indicate which value each result element will
216 /// get. The elements of VEC1/VEC2 are enumerated in order. This is quite
217 /// similar to the Altivec 'vperm' instruction, except that the indices must
218 /// be constants and are in terms of the element size of VEC1/VEC2, not in
222 /// VECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC) - Returns a vector, of the same
223 /// type as VEC1/VEC2. SHUFFLEVEC is a BUILD_VECTOR of constant int values
224 /// (regardless of whether its datatype is legal or not) that indicate
225 /// which value each result element will get. The elements of VEC1/VEC2 are
226 /// enumerated in order. This is quite similar to the Altivec 'vperm'
227 /// instruction, except that the indices must be constants and are in terms
228 /// of the element size of VEC1/VEC2, not in terms of bytes.
231 /// X = VBIT_CONVERT(Y) and X = VBIT_CONVERT(Y, COUNT,TYPE) - This node
232 /// represents a conversion from or to an ISD::Vector type.
234 /// This is lowered to a BIT_CONVERT of the appropriate input/output types.
235 /// The input and output are required to have the same size and at least one
236 /// is required to be a vector (if neither is a vector, just use
239 /// If the result is a vector, this takes three operands (like any other
240 /// vector producer) which indicate the size and type of the vector result.
241 /// Otherwise it takes one input.
244 /// BINOP(LHS, RHS, COUNT,TYPE)
245 /// Simple abstract vector operators. Unlike the integer and floating point
246 /// binary operators, these nodes also take two additional operands:
247 /// a constant element count, and a value type node indicating the type of
248 /// the elements. The order is count, type, op0, op1. All vector opcodes,
249 /// including VLOAD and VConstant must currently have count and type as
250 /// their last two operands.
251 VADD, VSUB, VMUL, VSDIV, VUDIV,
254 /// VSELECT(COND,LHS,RHS, COUNT,TYPE) - Select for MVT::Vector values.
255 /// COND is a boolean value. This node return LHS if COND is true, RHS if
259 /// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a
260 /// scalar value into the low element of the resultant vector type. The top
261 /// elements of the vector are undefined.
264 // MULHU/MULHS - Multiply high - Multiply two integers of type iN, producing
265 // an unsigned/signed value of type i[2*n], then return the top part.
268 // Bitwise operators - logical and, logical or, logical xor, shift left,
269 // shift right algebraic (shift in sign bits), shift right logical (shift in
270 // zeroes), rotate left, rotate right, and byteswap.
271 AND, OR, XOR, SHL, SRA, SRL, ROTL, ROTR, BSWAP,
273 // Counting operators
276 // Select(COND, TRUEVAL, FALSEVAL)
279 // Select with condition operator - This selects between a true value and
280 // a false value (ops #2 and #3) based on the boolean result of comparing
281 // the lhs and rhs (ops #0 and #1) of a conditional expression with the
282 // condition code in op #4, a CondCodeSDNode.
285 // SetCC operator - This evaluates to a boolean (i1) true value if the
286 // condition is true. The operands to this are the left and right operands
287 // to compare (ops #0, and #1) and the condition code to compare them with
288 // (op #2) as a CondCodeSDNode.
291 // SHL_PARTS/SRA_PARTS/SRL_PARTS - These operators are used for expanded
292 // integer shift operations, just like ADD/SUB_PARTS. The operation
294 // [Lo,Hi] = op [LoLHS,HiLHS], Amt
295 SHL_PARTS, SRA_PARTS, SRL_PARTS,
297 // Conversion operators. These are all single input single output
298 // operations. For all of these, the result type must be strictly
299 // wider or narrower (depending on the operation) than the source
302 // SIGN_EXTEND - Used for integer types, replicating the sign bit
306 // ZERO_EXTEND - Used for integer types, zeroing the new bits.
309 // ANY_EXTEND - Used for integer types. The high bits are undefined.
312 // TRUNCATE - Completely drop the high bits.
315 // [SU]INT_TO_FP - These operators convert integers (whose interpreted sign
316 // depends on the first letter) to floating point.
320 // SIGN_EXTEND_INREG - This operator atomically performs a SHL/SRA pair to
321 // sign extend a small value in a large integer register (e.g. sign
322 // extending the low 8 bits of a 32-bit register to fill the top 24 bits
323 // with the 7th bit). The size of the smaller type is indicated by the 1th
324 // operand, a ValueType node.
327 // FP_TO_[US]INT - Convert a floating point value to a signed or unsigned
332 // FP_ROUND - Perform a rounding operation from the current
333 // precision down to the specified precision (currently always 64->32).
336 // FP_ROUND_INREG - This operator takes a floating point register, and
337 // rounds it to a floating point value. It then promotes it and returns it
338 // in a register of the same size. This operation effectively just discards
339 // excess precision. The type to round down to is specified by the 1th
340 // operation, a VTSDNode (currently always 64->32->64).
343 // FP_EXTEND - Extend a smaller FP type into a larger FP type.
346 // BIT_CONVERT - Theis operator converts between integer and FP values, as
347 // if one was stored to memory as integer and the other was loaded from the
348 // same address (or equivalently for vector format conversions, etc). The
349 // source and result are required to have the same bit size (e.g.
350 // f32 <-> i32). This can also be used for int-to-int or fp-to-fp
351 // conversions, but that is a noop, deleted by getNode().
354 // FNEG, FABS, FSQRT, FSIN, FCOS - Perform unary floating point negation,
355 // absolute value, square root, sine and cosine operations.
356 FNEG, FABS, FSQRT, FSIN, FCOS,
358 // Other operators. LOAD and STORE have token chains as their first
359 // operand, then the same operands as an LLVM load/store instruction, then a
360 // SRCVALUE node that provides alias analysis information.
363 // Abstract vector version of LOAD. VLOAD has a constant element count as
364 // the first operand, followed by a value type node indicating the type of
365 // the elements, a token chain, a pointer operand, and a SRCVALUE node.
368 // EXTLOAD, SEXTLOAD, ZEXTLOAD - These three operators all load a value from
369 // memory and extend them to a larger value (e.g. load a byte into a word
370 // register). All three of these have four operands, a token chain, a
371 // pointer to load from, a SRCVALUE for alias analysis, and a VALUETYPE node
372 // indicating the type to load.
374 // SEXTLOAD loads the integer operand and sign extends it to a larger
375 // integer result type.
376 // ZEXTLOAD loads the integer operand and zero extends it to a larger
377 // integer result type.
378 // EXTLOAD is used for three things: floating point extending loads,
379 // integer extending loads [the top bits are undefined], and vector
380 // extending loads [load into low elt].
381 EXTLOAD, SEXTLOAD, ZEXTLOAD,
383 // TRUNCSTORE - This operators truncates (for integer) or rounds (for FP) a
384 // value and stores it to memory in one operation. This can be used for
385 // either integer or floating point operands. The first four operands of
386 // this are the same as a standard store. The fifth is the ValueType to
387 // store it as (which will be smaller than the source value).
390 // DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned
391 // to a specified boundary. The first operand is the token chain, the
392 // second is the number of bytes to allocate, and the third is the alignment
393 // boundary. The size is guaranteed to be a multiple of the stack
394 // alignment, and the alignment is guaranteed to be bigger than the stack
395 // alignment (if required) or 0 to get standard stack alignment.
398 // Control flow instructions. These all have token chains.
400 // BR - Unconditional branch. The first operand is the chain
401 // operand, the second is the MBB to branch to.
404 // BRIND - Indirect branch. The first operand is the chain, the second
405 // is the value to branch to, which must be of the same type as the target's
409 // BRCOND - Conditional branch. The first operand is the chain,
410 // the second is the condition, the third is the block to branch
411 // to if the condition is true.
414 // BR_CC - Conditional branch. The behavior is like that of SELECT_CC, in
415 // that the condition is represented as condition code, and two nodes to
416 // compare, rather than as a combined SetCC node. The operands in order are
417 // chain, cc, lhs, rhs, block to branch to if condition is true.
420 // RET - Return from function. The first operand is the chain,
421 // and any subsequent operands are pairs of return value and return value
422 // signness for the function. This operation can have variable number of
426 // INLINEASM - Represents an inline asm block. This node always has two
427 // return values: a chain and a flag result. The inputs are as follows:
428 // Operand #0 : Input chain.
429 // Operand #1 : a ExternalSymbolSDNode with a pointer to the asm string.
430 // Operand #2n+2: A RegisterNode.
431 // Operand #2n+3: A TargetConstant, indicating if the reg is a use/def
432 // Operand #last: Optional, an incoming flag.
435 // STACKSAVE - STACKSAVE has one operand, an input chain. It produces a
436 // value, the same type as the pointer type for the system, and an output
440 // STACKRESTORE has two operands, an input chain and a pointer to restore to
441 // it returns an output chain.
444 // MEMSET/MEMCPY/MEMMOVE - The first operand is the chain, and the rest
445 // correspond to the operands of the LLVM intrinsic functions. The only
446 // result is a token chain. The alignment argument is guaranteed to be a
452 // CALLSEQ_START/CALLSEQ_END - These operators mark the beginning and end of
453 // a call sequence, and carry arbitrary information that target might want
454 // to know. The first operand is a chain, the rest are specified by the
455 // target and not touched by the DAG optimizers.
456 CALLSEQ_START, // Beginning of a call sequence
457 CALLSEQ_END, // End of a call sequence
459 // VAARG - VAARG has three operands: an input chain, a pointer, and a
460 // SRCVALUE. It returns a pair of values: the vaarg value and a new chain.
463 // VACOPY - VACOPY has five operands: an input chain, a destination pointer,
464 // a source pointer, a SRCVALUE for the destination, and a SRCVALUE for the
468 // VAEND, VASTART - VAEND and VASTART have three operands: an input chain, a
469 // pointer, and a SRCVALUE.
472 // SRCVALUE - This corresponds to a Value*, and is used to associate memory
473 // locations with their value. This allows one use alias analysis
474 // information in the backend.
477 // PCMARKER - This corresponds to the pcmarker intrinsic.
480 // READCYCLECOUNTER - This corresponds to the readcyclecounter intrinsic.
481 // The only operand is a chain and a value and a chain are produced. The
482 // value is the contents of the architecture specific cycle counter like
483 // register (or other high accuracy low latency clock source)
486 // HANDLENODE node - Used as a handle for various purposes.
489 // LOCATION - This node is used to represent a source location for debug
490 // info. It takes token chain as input, then a line number, then a column
491 // number, then a filename, then a working dir. It produces a token chain
495 // DEBUG_LOC - This node is used to represent source line information
496 // embedded in the code. It takes a token chain as input, then a line
497 // number, then a column then a file id (provided by MachineDebugInfo.) It
498 // produces a token chain as output.
501 // DEBUG_LABEL - This node is used to mark a location in the code where a
502 // label should be generated for use by the debug information. It takes a
503 // token chain as input and then a unique id (provided by MachineDebugInfo.)
504 // It produces a token chain as output.
507 // BUILTIN_OP_END - This must be the last enum value in this list.
513 /// isBuildVectorAllOnes - Return true if the specified node is a
514 /// BUILD_VECTOR where all of the elements are ~0 or undef.
515 bool isBuildVectorAllOnes(const SDNode *N);
517 /// isBuildVectorAllZeros - Return true if the specified node is a
518 /// BUILD_VECTOR where all of the elements are 0 or undef.
519 bool isBuildVectorAllZeros(const SDNode *N);
521 //===--------------------------------------------------------------------===//
522 /// ISD::CondCode enum - These are ordered carefully to make the bitfields
523 /// below work out, when considering SETFALSE (something that never exists
524 /// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered
525 /// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal
526 /// to. If the "N" column is 1, the result of the comparison is undefined if
527 /// the input is a NAN.
529 /// All of these (except for the 'always folded ops') should be handled for
530 /// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT,
531 /// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used.
533 /// Note that these are laid out in a specific order to allow bit-twiddling
534 /// to transform conditions.
536 // Opcode N U L G E Intuitive operation
537 SETFALSE, // 0 0 0 0 Always false (always folded)
538 SETOEQ, // 0 0 0 1 True if ordered and equal
539 SETOGT, // 0 0 1 0 True if ordered and greater than
540 SETOGE, // 0 0 1 1 True if ordered and greater than or equal
541 SETOLT, // 0 1 0 0 True if ordered and less than
542 SETOLE, // 0 1 0 1 True if ordered and less than or equal
543 SETONE, // 0 1 1 0 True if ordered and operands are unequal
544 SETO, // 0 1 1 1 True if ordered (no nans)
545 SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y)
546 SETUEQ, // 1 0 0 1 True if unordered or equal
547 SETUGT, // 1 0 1 0 True if unordered or greater than
548 SETUGE, // 1 0 1 1 True if unordered, greater than, or equal
549 SETULT, // 1 1 0 0 True if unordered or less than
550 SETULE, // 1 1 0 1 True if unordered, less than, or equal
551 SETUNE, // 1 1 1 0 True if unordered or not equal
552 SETTRUE, // 1 1 1 1 Always true (always folded)
553 // Don't care operations: undefined if the input is a nan.
554 SETFALSE2, // 1 X 0 0 0 Always false (always folded)
555 SETEQ, // 1 X 0 0 1 True if equal
556 SETGT, // 1 X 0 1 0 True if greater than
557 SETGE, // 1 X 0 1 1 True if greater than or equal
558 SETLT, // 1 X 1 0 0 True if less than
559 SETLE, // 1 X 1 0 1 True if less than or equal
560 SETNE, // 1 X 1 1 0 True if not equal
561 SETTRUE2, // 1 X 1 1 1 Always true (always folded)
563 SETCC_INVALID // Marker value.
566 /// isSignedIntSetCC - Return true if this is a setcc instruction that
567 /// performs a signed comparison when used with integer operands.
568 inline bool isSignedIntSetCC(CondCode Code) {
569 return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE;
572 /// isUnsignedIntSetCC - Return true if this is a setcc instruction that
573 /// performs an unsigned comparison when used with integer operands.
574 inline bool isUnsignedIntSetCC(CondCode Code) {
575 return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE;
578 /// isTrueWhenEqual - Return true if the specified condition returns true if
579 /// the two operands to the condition are equal. Note that if one of the two
580 /// operands is a NaN, this value is meaningless.
581 inline bool isTrueWhenEqual(CondCode Cond) {
582 return ((int)Cond & 1) != 0;
585 /// getUnorderedFlavor - This function returns 0 if the condition is always
586 /// false if an operand is a NaN, 1 if the condition is always true if the
587 /// operand is a NaN, and 2 if the condition is undefined if the operand is a
589 inline unsigned getUnorderedFlavor(CondCode Cond) {
590 return ((int)Cond >> 3) & 3;
593 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
594 /// 'op' is a valid SetCC operation.
595 CondCode getSetCCInverse(CondCode Operation, bool isInteger);
597 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
598 /// when given the operation for (X op Y).
599 CondCode getSetCCSwappedOperands(CondCode Operation);
601 /// getSetCCOrOperation - Return the result of a logical OR between different
602 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This
603 /// function returns SETCC_INVALID if it is not possible to represent the
604 /// resultant comparison.
605 CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger);
607 /// getSetCCAndOperation - Return the result of a logical AND between
608 /// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
609 /// function returns SETCC_INVALID if it is not possible to represent the
610 /// resultant comparison.
611 CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger);
612 } // end llvm::ISD namespace
615 //===----------------------------------------------------------------------===//
616 /// SDOperand - Unlike LLVM values, Selection DAG nodes may return multiple
617 /// values as the result of a computation. Many nodes return multiple values,
618 /// from loads (which define a token and a return value) to ADDC (which returns
619 /// a result and a carry value), to calls (which may return an arbitrary number
622 /// As such, each use of a SelectionDAG computation must indicate the node that
623 /// computes it as well as which return value to use from that node. This pair
624 /// of information is represented with the SDOperand value type.
628 SDNode *Val; // The node defining the value we are using.
629 unsigned ResNo; // Which return value of the node we are using.
631 SDOperand() : Val(0), ResNo(0) {}
632 SDOperand(SDNode *val, unsigned resno) : Val(val), ResNo(resno) {}
634 bool operator==(const SDOperand &O) const {
635 return Val == O.Val && ResNo == O.ResNo;
637 bool operator!=(const SDOperand &O) const {
638 return !operator==(O);
640 bool operator<(const SDOperand &O) const {
641 return Val < O.Val || (Val == O.Val && ResNo < O.ResNo);
644 SDOperand getValue(unsigned R) const {
645 return SDOperand(Val, R);
648 // isOperand - Return true if this node is an operand of N.
649 bool isOperand(SDNode *N) const;
651 /// getValueType - Return the ValueType of the referenced return value.
653 inline MVT::ValueType getValueType() const;
655 // Forwarding methods - These forward to the corresponding methods in SDNode.
656 inline unsigned getOpcode() const;
657 inline unsigned getNumOperands() const;
658 inline const SDOperand &getOperand(unsigned i) const;
659 inline bool isTargetOpcode() const;
660 inline unsigned getTargetOpcode() const;
662 /// hasOneUse - Return true if there is exactly one operation using this
663 /// result value of the defining operator.
664 inline bool hasOneUse() const;
668 /// simplify_type specializations - Allow casting operators to work directly on
669 /// SDOperands as if they were SDNode*'s.
670 template<> struct simplify_type<SDOperand> {
671 typedef SDNode* SimpleType;
672 static SimpleType getSimplifiedValue(const SDOperand &Val) {
673 return static_cast<SimpleType>(Val.Val);
676 template<> struct simplify_type<const SDOperand> {
677 typedef SDNode* SimpleType;
678 static SimpleType getSimplifiedValue(const SDOperand &Val) {
679 return static_cast<SimpleType>(Val.Val);
684 /// SDNode - Represents one node in the SelectionDAG.
687 /// NodeType - The operation that this node performs.
689 unsigned short NodeType;
691 /// NodeId - Unique id per SDNode in the DAG.
694 /// OperandList - The values that are used by this operation.
696 SDOperand *OperandList;
698 /// ValueList - The types of the values this node defines. SDNode's may
699 /// define multiple values simultaneously.
700 const MVT::ValueType *ValueList;
702 /// NumOperands/NumValues - The number of entries in the Operand/Value list.
703 unsigned short NumOperands, NumValues;
705 /// Prev/Next pointers - These pointers form the linked list of of the
706 /// AllNodes list in the current DAG.
708 friend struct ilist_traits<SDNode>;
710 /// NextInBucket - This is used by the SelectionDAGCSEMap.
713 /// Uses - These are all of the SDNode's that use a value produced by this
715 std::vector<SDNode*> Uses;
717 // Out-of-line virtual method to give class a home.
718 virtual void ANCHOR();
721 assert(NumOperands == 0 && "Operand list not cleared before deletion");
722 assert(NextInBucket == 0 && "Still in CSEMap?");
723 NodeType = ISD::DELETED_NODE;
726 //===--------------------------------------------------------------------===//
729 unsigned getOpcode() const { return NodeType; }
730 bool isTargetOpcode() const { return NodeType >= ISD::BUILTIN_OP_END; }
731 unsigned getTargetOpcode() const {
732 assert(isTargetOpcode() && "Not a target opcode!");
733 return NodeType - ISD::BUILTIN_OP_END;
736 size_t use_size() const { return Uses.size(); }
737 bool use_empty() const { return Uses.empty(); }
738 bool hasOneUse() const { return Uses.size() == 1; }
740 /// getNodeId - Return the unique node id.
742 int getNodeId() const { return NodeId; }
744 typedef std::vector<SDNode*>::const_iterator use_iterator;
745 use_iterator use_begin() const { return Uses.begin(); }
746 use_iterator use_end() const { return Uses.end(); }
748 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
749 /// indicated value. This method ignores uses of other values defined by this
751 bool hasNUsesOfValue(unsigned NUses, unsigned Value) const;
753 // isOnlyUse - Return true if this node is the only use of N.
754 bool isOnlyUse(SDNode *N) const;
756 // isOperand - Return true if this node is an operand of N.
757 bool isOperand(SDNode *N) const;
759 /// getNumOperands - Return the number of values used by this operation.
761 unsigned getNumOperands() const { return NumOperands; }
763 const SDOperand &getOperand(unsigned Num) const {
764 assert(Num < NumOperands && "Invalid child # of SDNode!");
765 return OperandList[Num];
767 typedef const SDOperand* op_iterator;
768 op_iterator op_begin() const { return OperandList; }
769 op_iterator op_end() const { return OperandList+NumOperands; }
772 /// getNumValues - Return the number of values defined/returned by this
775 unsigned getNumValues() const { return NumValues; }
777 /// getValueType - Return the type of a specified result.
779 MVT::ValueType getValueType(unsigned ResNo) const {
780 assert(ResNo < NumValues && "Illegal result number!");
781 return ValueList[ResNo];
784 typedef const MVT::ValueType* value_iterator;
785 value_iterator value_begin() const { return ValueList; }
786 value_iterator value_end() const { return ValueList+NumValues; }
788 /// getOperationName - Return the opcode of this operation for printing.
790 const char* getOperationName(const SelectionDAG *G = 0) const;
792 void dump(const SelectionDAG *G) const;
794 static bool classof(const SDNode *) { return true; }
797 /// NextInBucket accessors, these are private to SelectionDAGCSEMap.
798 void *getNextInBucket() const { return NextInBucket; }
799 void SetNextInBucket(void *N) { NextInBucket = N; }
802 friend class SelectionDAG;
804 /// getValueTypeList - Return a pointer to the specified value type.
806 static MVT::ValueType *getValueTypeList(MVT::ValueType VT);
808 SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT), NodeId(-1) {
809 OperandList = 0; NumOperands = 0;
810 ValueList = getValueTypeList(VT);
815 SDNode(unsigned NT, SDOperand Op)
816 : NodeType(NT), NodeId(-1) {
817 OperandList = new SDOperand[1];
820 Op.Val->Uses.push_back(this);
826 SDNode(unsigned NT, SDOperand N1, SDOperand N2)
827 : NodeType(NT), NodeId(-1) {
828 OperandList = new SDOperand[2];
832 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
838 SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3)
839 : NodeType(NT), NodeId(-1) {
840 OperandList = new SDOperand[3];
846 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
847 N3.Val->Uses.push_back(this);
853 SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4)
854 : NodeType(NT), NodeId(-1) {
855 OperandList = new SDOperand[4];
862 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
863 N3.Val->Uses.push_back(this); N4.Val->Uses.push_back(this);
869 SDNode(unsigned Opc, const SDOperand *Ops, unsigned NumOps)
870 : NodeType(Opc), NodeId(-1) {
871 NumOperands = NumOps;
872 OperandList = new SDOperand[NumOperands];
874 for (unsigned i = 0, e = NumOps; i != e; ++i) {
875 OperandList[i] = Ops[i];
876 SDNode *N = OperandList[i].Val;
877 N->Uses.push_back(this);
885 /// MorphNodeTo - This clears the return value and operands list, and sets the
886 /// opcode of the node to the specified value. This should only be used by
887 /// the SelectionDAG class.
888 void MorphNodeTo(unsigned Opc) {
893 // Clear the operands list, updating used nodes to remove this from their
895 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
896 I->Val->removeUser(this);
897 delete [] OperandList;
902 void setValueTypes(const MVT::ValueType *List, unsigned NumVal) {
903 assert(NumValues == 0 && "Should not have values yet!");
908 void setOperands(SDOperand Op0) {
909 assert(NumOperands == 0 && "Should not have operands yet!");
910 OperandList = new SDOperand[1];
911 OperandList[0] = Op0;
913 Op0.Val->Uses.push_back(this);
915 void setOperands(SDOperand Op0, SDOperand Op1) {
916 assert(NumOperands == 0 && "Should not have operands yet!");
917 OperandList = new SDOperand[2];
918 OperandList[0] = Op0;
919 OperandList[1] = Op1;
921 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
923 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2) {
924 assert(NumOperands == 0 && "Should not have operands yet!");
925 OperandList = new SDOperand[3];
926 OperandList[0] = Op0;
927 OperandList[1] = Op1;
928 OperandList[2] = Op2;
930 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
931 Op2.Val->Uses.push_back(this);
933 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3) {
934 assert(NumOperands == 0 && "Should not have operands yet!");
935 OperandList = new SDOperand[4];
936 OperandList[0] = Op0;
937 OperandList[1] = Op1;
938 OperandList[2] = Op2;
939 OperandList[3] = Op3;
941 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
942 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this);
944 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3,
946 assert(NumOperands == 0 && "Should not have operands yet!");
947 OperandList = new SDOperand[5];
948 OperandList[0] = Op0;
949 OperandList[1] = Op1;
950 OperandList[2] = Op2;
951 OperandList[3] = Op3;
952 OperandList[4] = Op4;
954 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
955 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this);
956 Op4.Val->Uses.push_back(this);
958 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3,
959 SDOperand Op4, SDOperand Op5) {
960 assert(NumOperands == 0 && "Should not have operands yet!");
961 OperandList = new SDOperand[6];
962 OperandList[0] = Op0;
963 OperandList[1] = Op1;
964 OperandList[2] = Op2;
965 OperandList[3] = Op3;
966 OperandList[4] = Op4;
967 OperandList[5] = Op5;
969 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
970 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this);
971 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this);
973 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3,
974 SDOperand Op4, SDOperand Op5, SDOperand Op6) {
975 assert(NumOperands == 0 && "Should not have operands yet!");
976 OperandList = new SDOperand[7];
977 OperandList[0] = Op0;
978 OperandList[1] = Op1;
979 OperandList[2] = Op2;
980 OperandList[3] = Op3;
981 OperandList[4] = Op4;
982 OperandList[5] = Op5;
983 OperandList[6] = Op6;
985 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
986 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this);
987 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this);
988 Op6.Val->Uses.push_back(this);
990 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3,
991 SDOperand Op4, SDOperand Op5, SDOperand Op6, SDOperand Op7) {
992 assert(NumOperands == 0 && "Should not have operands yet!");
993 OperandList = new SDOperand[8];
994 OperandList[0] = Op0;
995 OperandList[1] = Op1;
996 OperandList[2] = Op2;
997 OperandList[3] = Op3;
998 OperandList[4] = Op4;
999 OperandList[5] = Op5;
1000 OperandList[6] = Op6;
1001 OperandList[7] = Op7;
1003 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this);
1004 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this);
1005 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this);
1006 Op6.Val->Uses.push_back(this); Op7.Val->Uses.push_back(this);
1009 void addUser(SDNode *User) {
1010 Uses.push_back(User);
1012 void removeUser(SDNode *User) {
1013 // Remove this user from the operand's use list.
1014 for (unsigned i = Uses.size(); ; --i) {
1015 assert(i != 0 && "Didn't find user!");
1016 if (Uses[i-1] == User) {
1017 Uses[i-1] = Uses.back();
1024 void setNodeId(int Id) {
1030 // Define inline functions from the SDOperand class.
1032 inline unsigned SDOperand::getOpcode() const {
1033 return Val->getOpcode();
1035 inline MVT::ValueType SDOperand::getValueType() const {
1036 return Val->getValueType(ResNo);
1038 inline unsigned SDOperand::getNumOperands() const {
1039 return Val->getNumOperands();
1041 inline const SDOperand &SDOperand::getOperand(unsigned i) const {
1042 return Val->getOperand(i);
1044 inline bool SDOperand::isTargetOpcode() const {
1045 return Val->isTargetOpcode();
1047 inline unsigned SDOperand::getTargetOpcode() const {
1048 return Val->getTargetOpcode();
1050 inline bool SDOperand::hasOneUse() const {
1051 return Val->hasNUsesOfValue(1, ResNo);
1054 /// HandleSDNode - This class is used to form a handle around another node that
1055 /// is persistant and is updated across invocations of replaceAllUsesWith on its
1056 /// operand. This node should be directly created by end-users and not added to
1057 /// the AllNodes list.
1058 class HandleSDNode : public SDNode {
1060 HandleSDNode(SDOperand X) : SDNode(ISD::HANDLENODE, X) {}
1062 MorphNodeTo(ISD::HANDLENODE); // Drops operand uses.
1065 SDOperand getValue() const { return getOperand(0); }
1068 class StringSDNode : public SDNode {
1071 friend class SelectionDAG;
1072 StringSDNode(const std::string &val)
1073 : SDNode(ISD::STRING, MVT::Other), Value(val) {
1076 const std::string &getValue() const { return Value; }
1077 static bool classof(const StringSDNode *) { return true; }
1078 static bool classof(const SDNode *N) {
1079 return N->getOpcode() == ISD::STRING;
1083 class ConstantSDNode : public SDNode {
1086 friend class SelectionDAG;
1087 ConstantSDNode(bool isTarget, uint64_t val, MVT::ValueType VT)
1088 : SDNode(isTarget ? ISD::TargetConstant : ISD::Constant, VT), Value(val) {
1092 uint64_t getValue() const { return Value; }
1094 int64_t getSignExtended() const {
1095 unsigned Bits = MVT::getSizeInBits(getValueType(0));
1096 return ((int64_t)Value << (64-Bits)) >> (64-Bits);
1099 bool isNullValue() const { return Value == 0; }
1100 bool isAllOnesValue() const {
1101 return Value == MVT::getIntVTBitMask(getValueType(0));
1104 static bool classof(const ConstantSDNode *) { return true; }
1105 static bool classof(const SDNode *N) {
1106 return N->getOpcode() == ISD::Constant ||
1107 N->getOpcode() == ISD::TargetConstant;
1111 class ConstantFPSDNode : public SDNode {
1114 friend class SelectionDAG;
1115 ConstantFPSDNode(bool isTarget, double val, MVT::ValueType VT)
1116 : SDNode(isTarget ? ISD::TargetConstantFP : ISD::ConstantFP, VT),
1121 double getValue() const { return Value; }
1123 /// isExactlyValue - We don't rely on operator== working on double values, as
1124 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
1125 /// As such, this method can be used to do an exact bit-for-bit comparison of
1126 /// two floating point values.
1127 bool isExactlyValue(double V) const;
1129 static bool classof(const ConstantFPSDNode *) { return true; }
1130 static bool classof(const SDNode *N) {
1131 return N->getOpcode() == ISD::ConstantFP ||
1132 N->getOpcode() == ISD::TargetConstantFP;
1136 class GlobalAddressSDNode : public SDNode {
1137 GlobalValue *TheGlobal;
1140 friend class SelectionDAG;
1141 GlobalAddressSDNode(bool isTarget, const GlobalValue *GA, MVT::ValueType VT,
1143 : SDNode(isTarget ? ISD::TargetGlobalAddress : ISD::GlobalAddress, VT),
1145 TheGlobal = const_cast<GlobalValue*>(GA);
1149 GlobalValue *getGlobal() const { return TheGlobal; }
1150 int getOffset() const { return Offset; }
1152 static bool classof(const GlobalAddressSDNode *) { return true; }
1153 static bool classof(const SDNode *N) {
1154 return N->getOpcode() == ISD::GlobalAddress ||
1155 N->getOpcode() == ISD::TargetGlobalAddress;
1160 class FrameIndexSDNode : public SDNode {
1163 friend class SelectionDAG;
1164 FrameIndexSDNode(int fi, MVT::ValueType VT, bool isTarg)
1165 : SDNode(isTarg ? ISD::TargetFrameIndex : ISD::FrameIndex, VT), FI(fi) {}
1168 int getIndex() const { return FI; }
1170 static bool classof(const FrameIndexSDNode *) { return true; }
1171 static bool classof(const SDNode *N) {
1172 return N->getOpcode() == ISD::FrameIndex ||
1173 N->getOpcode() == ISD::TargetFrameIndex;
1177 class JumpTableSDNode : public SDNode {
1180 friend class SelectionDAG;
1181 JumpTableSDNode(int jti, MVT::ValueType VT, bool isTarg)
1182 : SDNode(isTarg ? ISD::TargetJumpTable : ISD::JumpTable, VT),
1186 int getIndex() const { return JTI; }
1188 static bool classof(const JumpTableSDNode *) { return true; }
1189 static bool classof(const SDNode *N) {
1190 return N->getOpcode() == ISD::JumpTable ||
1191 N->getOpcode() == ISD::TargetJumpTable;
1195 class ConstantPoolSDNode : public SDNode {
1200 friend class SelectionDAG;
1201 ConstantPoolSDNode(bool isTarget, Constant *c, MVT::ValueType VT,
1203 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, VT),
1204 C(c), Offset(o), Alignment(0) {}
1205 ConstantPoolSDNode(bool isTarget, Constant *c, MVT::ValueType VT, int o,
1207 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, VT),
1208 C(c), Offset(o), Alignment(Align) {}
1211 Constant *get() const { return C; }
1212 int getOffset() const { return Offset; }
1214 // Return the alignment of this constant pool object, which is either 0 (for
1215 // default alignment) or log2 of the desired value.
1216 unsigned getAlignment() const { return Alignment; }
1218 static bool classof(const ConstantPoolSDNode *) { return true; }
1219 static bool classof(const SDNode *N) {
1220 return N->getOpcode() == ISD::ConstantPool ||
1221 N->getOpcode() == ISD::TargetConstantPool;
1225 class BasicBlockSDNode : public SDNode {
1226 MachineBasicBlock *MBB;
1228 friend class SelectionDAG;
1229 BasicBlockSDNode(MachineBasicBlock *mbb)
1230 : SDNode(ISD::BasicBlock, MVT::Other), MBB(mbb) {}
1233 MachineBasicBlock *getBasicBlock() const { return MBB; }
1235 static bool classof(const BasicBlockSDNode *) { return true; }
1236 static bool classof(const SDNode *N) {
1237 return N->getOpcode() == ISD::BasicBlock;
1241 class SrcValueSDNode : public SDNode {
1245 friend class SelectionDAG;
1246 SrcValueSDNode(const Value* v, int o)
1247 : SDNode(ISD::SRCVALUE, MVT::Other), V(v), offset(o) {}
1250 const Value *getValue() const { return V; }
1251 int getOffset() const { return offset; }
1253 static bool classof(const SrcValueSDNode *) { return true; }
1254 static bool classof(const SDNode *N) {
1255 return N->getOpcode() == ISD::SRCVALUE;
1260 class RegisterSDNode : public SDNode {
1263 friend class SelectionDAG;
1264 RegisterSDNode(unsigned reg, MVT::ValueType VT)
1265 : SDNode(ISD::Register, VT), Reg(reg) {}
1268 unsigned getReg() const { return Reg; }
1270 static bool classof(const RegisterSDNode *) { return true; }
1271 static bool classof(const SDNode *N) {
1272 return N->getOpcode() == ISD::Register;
1276 class ExternalSymbolSDNode : public SDNode {
1279 friend class SelectionDAG;
1280 ExternalSymbolSDNode(bool isTarget, const char *Sym, MVT::ValueType VT)
1281 : SDNode(isTarget ? ISD::TargetExternalSymbol : ISD::ExternalSymbol, VT),
1286 const char *getSymbol() const { return Symbol; }
1288 static bool classof(const ExternalSymbolSDNode *) { return true; }
1289 static bool classof(const SDNode *N) {
1290 return N->getOpcode() == ISD::ExternalSymbol ||
1291 N->getOpcode() == ISD::TargetExternalSymbol;
1295 class CondCodeSDNode : public SDNode {
1296 ISD::CondCode Condition;
1298 friend class SelectionDAG;
1299 CondCodeSDNode(ISD::CondCode Cond)
1300 : SDNode(ISD::CONDCODE, MVT::Other), Condition(Cond) {
1304 ISD::CondCode get() const { return Condition; }
1306 static bool classof(const CondCodeSDNode *) { return true; }
1307 static bool classof(const SDNode *N) {
1308 return N->getOpcode() == ISD::CONDCODE;
1312 /// VTSDNode - This class is used to represent MVT::ValueType's, which are used
1313 /// to parameterize some operations.
1314 class VTSDNode : public SDNode {
1315 MVT::ValueType ValueType;
1317 friend class SelectionDAG;
1318 VTSDNode(MVT::ValueType VT)
1319 : SDNode(ISD::VALUETYPE, MVT::Other), ValueType(VT) {}
1322 MVT::ValueType getVT() const { return ValueType; }
1324 static bool classof(const VTSDNode *) { return true; }
1325 static bool classof(const SDNode *N) {
1326 return N->getOpcode() == ISD::VALUETYPE;
1331 class SDNodeIterator : public forward_iterator<SDNode, ptrdiff_t> {
1335 SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {}
1337 bool operator==(const SDNodeIterator& x) const {
1338 return Operand == x.Operand;
1340 bool operator!=(const SDNodeIterator& x) const { return !operator==(x); }
1342 const SDNodeIterator &operator=(const SDNodeIterator &I) {
1343 assert(I.Node == Node && "Cannot assign iterators to two different nodes!");
1344 Operand = I.Operand;
1348 pointer operator*() const {
1349 return Node->getOperand(Operand).Val;
1351 pointer operator->() const { return operator*(); }
1353 SDNodeIterator& operator++() { // Preincrement
1357 SDNodeIterator operator++(int) { // Postincrement
1358 SDNodeIterator tmp = *this; ++*this; return tmp;
1361 static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); }
1362 static SDNodeIterator end (SDNode *N) {
1363 return SDNodeIterator(N, N->getNumOperands());
1366 unsigned getOperand() const { return Operand; }
1367 const SDNode *getNode() const { return Node; }
1370 template <> struct GraphTraits<SDNode*> {
1371 typedef SDNode NodeType;
1372 typedef SDNodeIterator ChildIteratorType;
1373 static inline NodeType *getEntryNode(SDNode *N) { return N; }
1374 static inline ChildIteratorType child_begin(NodeType *N) {
1375 return SDNodeIterator::begin(N);
1377 static inline ChildIteratorType child_end(NodeType *N) {
1378 return SDNodeIterator::end(N);
1383 struct ilist_traits<SDNode> {
1384 static SDNode *getPrev(const SDNode *N) { return N->Prev; }
1385 static SDNode *getNext(const SDNode *N) { return N->Next; }
1387 static void setPrev(SDNode *N, SDNode *Prev) { N->Prev = Prev; }
1388 static void setNext(SDNode *N, SDNode *Next) { N->Next = Next; }
1390 static SDNode *createSentinel() {
1391 return new SDNode(ISD::EntryToken, MVT::Other);
1393 static void destroySentinel(SDNode *N) { delete N; }
1394 //static SDNode *createNode(const SDNode &V) { return new SDNode(V); }
1397 void addNodeToList(SDNode *NTy) {}
1398 void removeNodeFromList(SDNode *NTy) {}
1399 void transferNodesFromList(iplist<SDNode, ilist_traits> &L2,
1400 const ilist_iterator<SDNode> &X,
1401 const ilist_iterator<SDNode> &Y) {}
1404 } // end llvm namespace