SelectionDAGNodes.h revision a27ea9e89f38e9bcca4d67defb0bae887a16d72c
1//===-- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ---*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 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. 14// 15// Clients should include the SelectionDAG.h file instead of this file directly. 16// 17//===----------------------------------------------------------------------===// 18 19#ifndef LLVM_CODEGEN_SELECTIONDAGNODES_H 20#define LLVM_CODEGEN_SELECTIONDAGNODES_H 21 22#include "llvm/Constants.h" 23#include "llvm/ADT/FoldingSet.h" 24#include "llvm/ADT/GraphTraits.h" 25#include "llvm/ADT/iterator.h" 26#include "llvm/ADT/ilist_node.h" 27#include "llvm/ADT/STLExtras.h" 28#include "llvm/CodeGen/ValueTypes.h" 29#include "llvm/CodeGen/MachineMemOperand.h" 30#include "llvm/Support/Allocator.h" 31#include "llvm/Support/RecyclingAllocator.h" 32#include "llvm/Support/DataTypes.h" 33#include "llvm/CodeGen/DebugLoc.h" 34#include <cassert> 35 36namespace llvm { 37 38class SelectionDAG; 39class GlobalValue; 40class MachineBasicBlock; 41class MachineConstantPoolValue; 42class SDNode; 43class Value; 44template <typename T> struct DenseMapInfo; 45template <typename T> struct simplify_type; 46template <typename T> struct ilist_traits; 47 48/// SDVTList - This represents a list of ValueType's that has been intern'd by 49/// a SelectionDAG. Instances of this simple value class are returned by 50/// SelectionDAG::getVTList(...). 51/// 52struct SDVTList { 53 const MVT *VTs; 54 unsigned short NumVTs; 55}; 56 57/// ISD namespace - This namespace contains an enum which represents all of the 58/// SelectionDAG node types and value types. 59/// 60namespace ISD { 61 62 //===--------------------------------------------------------------------===// 63 /// ISD::NodeType enum - This enum defines the target-independent operators 64 /// for a SelectionDAG. 65 /// 66 /// Targets may also define target-dependent operator codes for SDNodes. For 67 /// example, on x86, these are the enum values in the X86ISD namespace. 68 /// Targets should aim to use target-independent operators to model their 69 /// instruction sets as much as possible, and only use target-dependent 70 /// operators when they have special requirements. 71 /// 72 /// Finally, during and after selection proper, SNodes may use special 73 /// operator codes that correspond directly with MachineInstr opcodes. These 74 /// are used to represent selected instructions. See the isMachineOpcode() 75 /// and getMachineOpcode() member functions of SDNode. 76 /// 77 enum NodeType { 78 // DELETED_NODE - This is an illegal flag value that is used to catch 79 // errors. This opcode is not a legal opcode for any node. 80 DELETED_NODE, 81 82 // EntryToken - This is the marker used to indicate the start of the region. 83 EntryToken, 84 85 // TokenFactor - This node takes multiple tokens as input and produces a 86 // single token result. This is used to represent the fact that the operand 87 // operators are independent of each other. 88 TokenFactor, 89 90 // AssertSext, AssertZext - These nodes record if a register contains a 91 // value that has already been zero or sign extended from a narrower type. 92 // These nodes take two operands. The first is the node that has already 93 // been extended, and the second is a value type node indicating the width 94 // of the extension 95 AssertSext, AssertZext, 96 97 // Various leaf nodes. 98 BasicBlock, VALUETYPE, ARG_FLAGS, CONDCODE, Register, 99 Constant, ConstantFP, 100 GlobalAddress, GlobalTLSAddress, FrameIndex, 101 JumpTable, ConstantPool, ExternalSymbol, 102 103 // The address of the GOT 104 GLOBAL_OFFSET_TABLE, 105 106 // FRAMEADDR, RETURNADDR - These nodes represent llvm.frameaddress and 107 // llvm.returnaddress on the DAG. These nodes take one operand, the index 108 // of the frame or return address to return. An index of zero corresponds 109 // to the current function's frame or return address, an index of one to the 110 // parent's frame or return address, and so on. 111 FRAMEADDR, RETURNADDR, 112 113 // FRAME_TO_ARGS_OFFSET - This node represents offset from frame pointer to 114 // first (possible) on-stack argument. This is needed for correct stack 115 // adjustment during unwind. 116 FRAME_TO_ARGS_OFFSET, 117 118 // RESULT, OUTCHAIN = EXCEPTIONADDR(INCHAIN) - This node represents the 119 // address of the exception block on entry to an landing pad block. 120 EXCEPTIONADDR, 121 122 // RESULT, OUTCHAIN = EHSELECTION(INCHAIN, EXCEPTION) - This node represents 123 // the selection index of the exception thrown. 124 EHSELECTION, 125 126 // OUTCHAIN = EH_RETURN(INCHAIN, OFFSET, HANDLER) - This node represents 127 // 'eh_return' gcc dwarf builtin, which is used to return from 128 // exception. The general meaning is: adjust stack by OFFSET and pass 129 // execution to HANDLER. Many platform-related details also :) 130 EH_RETURN, 131 132 // TargetConstant* - Like Constant*, but the DAG does not do any folding or 133 // simplification of the constant. 134 TargetConstant, 135 TargetConstantFP, 136 137 // TargetGlobalAddress - Like GlobalAddress, but the DAG does no folding or 138 // anything else with this node, and this is valid in the target-specific 139 // dag, turning into a GlobalAddress operand. 140 TargetGlobalAddress, 141 TargetGlobalTLSAddress, 142 TargetFrameIndex, 143 TargetJumpTable, 144 TargetConstantPool, 145 TargetExternalSymbol, 146 147 /// RESULT = INTRINSIC_WO_CHAIN(INTRINSICID, arg1, arg2, ...) 148 /// This node represents a target intrinsic function with no side effects. 149 /// The first operand is the ID number of the intrinsic from the 150 /// llvm::Intrinsic namespace. The operands to the intrinsic follow. The 151 /// node has returns the result of the intrinsic. 152 INTRINSIC_WO_CHAIN, 153 154 /// RESULT,OUTCHAIN = INTRINSIC_W_CHAIN(INCHAIN, INTRINSICID, arg1, ...) 155 /// This node represents a target intrinsic function with side effects that 156 /// returns a result. The first operand is a chain pointer. The second is 157 /// the ID number of the intrinsic from the llvm::Intrinsic namespace. The 158 /// operands to the intrinsic follow. The node has two results, the result 159 /// of the intrinsic and an output chain. 160 INTRINSIC_W_CHAIN, 161 162 /// OUTCHAIN = INTRINSIC_VOID(INCHAIN, INTRINSICID, arg1, arg2, ...) 163 /// This node represents a target intrinsic function with side effects that 164 /// does not return a result. The first operand is a chain pointer. The 165 /// second is the ID number of the intrinsic from the llvm::Intrinsic 166 /// namespace. The operands to the intrinsic follow. 167 INTRINSIC_VOID, 168 169 // CopyToReg - This node has three operands: a chain, a register number to 170 // set to this value, and a value. 171 CopyToReg, 172 173 // CopyFromReg - This node indicates that the input value is a virtual or 174 // physical register that is defined outside of the scope of this 175 // SelectionDAG. The register is available from the RegisterSDNode object. 176 CopyFromReg, 177 178 // UNDEF - An undefined node 179 UNDEF, 180 181 /// FORMAL_ARGUMENTS(CHAIN, CC#, ISVARARG, FLAG0, ..., FLAGn) - This node 182 /// represents the formal arguments for a function. CC# is a Constant value 183 /// indicating the calling convention of the function, and ISVARARG is a 184 /// flag that indicates whether the function is varargs or not. This node 185 /// has one result value for each incoming argument, plus one for the output 186 /// chain. It must be custom legalized. See description of CALL node for 187 /// FLAG argument contents explanation. 188 /// 189 FORMAL_ARGUMENTS, 190 191 /// RV1, RV2...RVn, CHAIN = CALL(CHAIN, CALLEE, 192 /// ARG0, FLAG0, ARG1, FLAG1, ... ARGn, FLAGn) 193 /// This node represents a fully general function call, before the legalizer 194 /// runs. This has one result value for each argument / flag pair, plus 195 /// a chain result. It must be custom legalized. Flag argument indicates 196 /// misc. argument attributes. Currently: 197 /// Bit 0 - signness 198 /// Bit 1 - 'inreg' attribute 199 /// Bit 2 - 'sret' attribute 200 /// Bit 4 - 'byval' attribute 201 /// Bit 5 - 'nest' attribute 202 /// Bit 6-9 - alignment of byval structures 203 /// Bit 10-26 - size of byval structures 204 /// Bits 31:27 - argument ABI alignment in the first argument piece and 205 /// alignment '1' in other argument pieces. 206 /// 207 /// CALL nodes use the CallSDNode subclass of SDNode, which 208 /// additionally carries information about the calling convention, 209 /// whether the call is varargs, and if it's marked as a tail call. 210 /// 211 CALL, 212 213 // EXTRACT_ELEMENT - This is used to get the lower or upper (determined by 214 // a Constant, which is required to be operand #1) half of the integer or 215 // float value specified as operand #0. This is only for use before 216 // legalization, for values that will be broken into multiple registers. 217 EXTRACT_ELEMENT, 218 219 // BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways. Given 220 // two values of the same integer value type, this produces a value twice as 221 // big. Like EXTRACT_ELEMENT, this can only be used before legalization. 222 BUILD_PAIR, 223 224 // MERGE_VALUES - This node takes multiple discrete operands and returns 225 // them all as its individual results. This nodes has exactly the same 226 // number of inputs and outputs, and is only valid before legalization. 227 // This node is useful for some pieces of the code generator that want to 228 // think about a single node with multiple results, not multiple nodes. 229 MERGE_VALUES, 230 231 // Simple integer binary arithmetic operators. 232 ADD, SUB, MUL, SDIV, UDIV, SREM, UREM, 233 234 // SMUL_LOHI/UMUL_LOHI - Multiply two integers of type iN, producing 235 // a signed/unsigned value of type i[2*N], and return the full value as 236 // two results, each of type iN. 237 SMUL_LOHI, UMUL_LOHI, 238 239 // SDIVREM/UDIVREM - Divide two integers and produce both a quotient and 240 // remainder result. 241 SDIVREM, UDIVREM, 242 243 // CARRY_FALSE - This node is used when folding other nodes, 244 // like ADDC/SUBC, which indicate the carry result is always false. 245 CARRY_FALSE, 246 247 // Carry-setting nodes for multiple precision addition and subtraction. 248 // These nodes take two operands of the same value type, and produce two 249 // results. The first result is the normal add or sub result, the second 250 // result is the carry flag result. 251 ADDC, SUBC, 252 253 // Carry-using nodes for multiple precision addition and subtraction. These 254 // nodes take three operands: The first two are the normal lhs and rhs to 255 // the add or sub, and the third is the input carry flag. These nodes 256 // produce two results; the normal result of the add or sub, and the output 257 // carry flag. These nodes both read and write a carry flag to allow them 258 // to them to be chained together for add and sub of arbitrarily large 259 // values. 260 ADDE, SUBE, 261 262 // RESULT, BOOL = [SU]ADDO(LHS, RHS) - Overflow-aware nodes for addition. 263 // These nodes take two operands: the normal LHS and RHS to the add. They 264 // produce two results: the normal result of the add, and a boolean that 265 // indicates if an overflow occured (*not* a flag, because it may be stored 266 // to memory, etc.). If the type of the boolean is not i1 then the high 267 // bits conform to getBooleanContents. 268 // These nodes are generated from the llvm.[su]add.with.overflow intrinsics. 269 SADDO, UADDO, 270 271 // Same for subtraction 272 SSUBO, USUBO, 273 274 // Same for multiplication 275 SMULO, UMULO, 276 277 // Simple binary floating point operators. 278 FADD, FSUB, FMUL, FDIV, FREM, 279 280 // FCOPYSIGN(X, Y) - Return the value of X with the sign of Y. NOTE: This 281 // DAG node does not require that X and Y have the same type, just that they 282 // are both floating point. X and the result must have the same type. 283 // FCOPYSIGN(f32, f64) is allowed. 284 FCOPYSIGN, 285 286 // INT = FGETSIGN(FP) - Return the sign bit of the specified floating point 287 // value as an integer 0/1 value. 288 FGETSIGN, 289 290 /// BUILD_VECTOR(ELT0, ELT1, ELT2, ELT3,...) - Return a vector 291 /// with the specified, possibly variable, elements. The number of elements 292 /// is required to be a power of two. 293 BUILD_VECTOR, 294 295 /// INSERT_VECTOR_ELT(VECTOR, VAL, IDX) - Returns VECTOR with the element 296 /// at IDX replaced with VAL. If the type of VAL is larger than the vector 297 /// element type then VAL is truncated before replacement. 298 INSERT_VECTOR_ELT, 299 300 /// EXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR 301 /// identified by the (potentially variable) element number IDX. 302 EXTRACT_VECTOR_ELT, 303 304 /// CONCAT_VECTORS(VECTOR0, VECTOR1, ...) - Given a number of values of 305 /// vector type with the same length and element type, this produces a 306 /// concatenated vector result value, with length equal to the sum of the 307 /// lengths of the input vectors. 308 CONCAT_VECTORS, 309 310 /// EXTRACT_SUBVECTOR(VECTOR, IDX) - Returns a subvector from VECTOR (an 311 /// vector value) starting with the (potentially variable) element number 312 /// IDX, which must be a multiple of the result vector length. 313 EXTRACT_SUBVECTOR, 314 315 /// VECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC) - Returns a vector, of the same 316 /// type as VEC1/VEC2. SHUFFLEVEC is a BUILD_VECTOR of constant int values 317 /// (maybe of an illegal datatype) or undef that indicate which value each 318 /// result element will get. The elements of VEC1/VEC2 are enumerated in 319 /// order. This is quite similar to the Altivec 'vperm' instruction, except 320 /// that the indices must be constants and are in terms of the element size 321 /// of VEC1/VEC2, not in terms of bytes. 322 VECTOR_SHUFFLE, 323 324 /// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a 325 /// scalar value into element 0 of the resultant vector type. The top 326 /// elements 1 to N-1 of the N-element vector are undefined. 327 SCALAR_TO_VECTOR, 328 329 // EXTRACT_SUBREG - This node is used to extract a sub-register value. 330 // This node takes a superreg and a constant sub-register index as operands. 331 // Note sub-register indices must be increasing. That is, if the 332 // sub-register index of a 8-bit sub-register is N, then the index for a 333 // 16-bit sub-register must be at least N+1. 334 EXTRACT_SUBREG, 335 336 // INSERT_SUBREG - This node is used to insert a sub-register value. 337 // This node takes a superreg, a subreg value, and a constant sub-register 338 // index as operands. 339 INSERT_SUBREG, 340 341 // MULHU/MULHS - Multiply high - Multiply two integers of type iN, producing 342 // an unsigned/signed value of type i[2*N], then return the top part. 343 MULHU, MULHS, 344 345 // Bitwise operators - logical and, logical or, logical xor, shift left, 346 // shift right algebraic (shift in sign bits), shift right logical (shift in 347 // zeroes), rotate left, rotate right, and byteswap. 348 AND, OR, XOR, SHL, SRA, SRL, ROTL, ROTR, BSWAP, 349 350 // Counting operators 351 CTTZ, CTLZ, CTPOP, 352 353 // Select(COND, TRUEVAL, FALSEVAL). If the type of the boolean COND is not 354 // i1 then the high bits must conform to getBooleanContents. 355 SELECT, 356 357 // Select with condition operator - This selects between a true value and 358 // a false value (ops #2 and #3) based on the boolean result of comparing 359 // the lhs and rhs (ops #0 and #1) of a conditional expression with the 360 // condition code in op #4, a CondCodeSDNode. 361 SELECT_CC, 362 363 // SetCC operator - This evaluates to a true value iff the condition is 364 // true. If the result value type is not i1 then the high bits conform 365 // to getBooleanContents. The operands to this are the left and right 366 // operands to compare (ops #0, and #1) and the condition code to compare 367 // them with (op #2) as a CondCodeSDNode. 368 SETCC, 369 370 // Vector SetCC operator - This evaluates to a vector of integer elements 371 // with the high bit in each element set to true if the comparison is true 372 // and false if the comparison is false. All other bits in each element 373 // are undefined. The operands to this are the left and right operands 374 // to compare (ops #0, and #1) and the condition code to compare them with 375 // (op #2) as a CondCodeSDNode. 376 VSETCC, 377 378 // SHL_PARTS/SRA_PARTS/SRL_PARTS - These operators are used for expanded 379 // integer shift operations, just like ADD/SUB_PARTS. The operation 380 // ordering is: 381 // [Lo,Hi] = op [LoLHS,HiLHS], Amt 382 SHL_PARTS, SRA_PARTS, SRL_PARTS, 383 384 // Conversion operators. These are all single input single output 385 // operations. For all of these, the result type must be strictly 386 // wider or narrower (depending on the operation) than the source 387 // type. 388 389 // SIGN_EXTEND - Used for integer types, replicating the sign bit 390 // into new bits. 391 SIGN_EXTEND, 392 393 // ZERO_EXTEND - Used for integer types, zeroing the new bits. 394 ZERO_EXTEND, 395 396 // ANY_EXTEND - Used for integer types. The high bits are undefined. 397 ANY_EXTEND, 398 399 // TRUNCATE - Completely drop the high bits. 400 TRUNCATE, 401 402 // [SU]INT_TO_FP - These operators convert integers (whose interpreted sign 403 // depends on the first letter) to floating point. 404 SINT_TO_FP, 405 UINT_TO_FP, 406 407 // SIGN_EXTEND_INREG - This operator atomically performs a SHL/SRA pair to 408 // sign extend a small value in a large integer register (e.g. sign 409 // extending the low 8 bits of a 32-bit register to fill the top 24 bits 410 // with the 7th bit). The size of the smaller type is indicated by the 1th 411 // operand, a ValueType node. 412 SIGN_EXTEND_INREG, 413 414 /// FP_TO_[US]INT - Convert a floating point value to a signed or unsigned 415 /// integer. 416 FP_TO_SINT, 417 FP_TO_UINT, 418 419 /// X = FP_ROUND(Y, TRUNC) - Rounding 'Y' from a larger floating point type 420 /// down to the precision of the destination VT. TRUNC is a flag, which is 421 /// always an integer that is zero or one. If TRUNC is 0, this is a 422 /// normal rounding, if it is 1, this FP_ROUND is known to not change the 423 /// value of Y. 424 /// 425 /// The TRUNC = 1 case is used in cases where we know that the value will 426 /// not be modified by the node, because Y is not using any of the extra 427 /// precision of source type. This allows certain transformations like 428 /// FP_EXTEND(FP_ROUND(X,1)) -> X which are not safe for 429 /// FP_EXTEND(FP_ROUND(X,0)) because the extra bits aren't removed. 430 FP_ROUND, 431 432 // FLT_ROUNDS_ - Returns current rounding mode: 433 // -1 Undefined 434 // 0 Round to 0 435 // 1 Round to nearest 436 // 2 Round to +inf 437 // 3 Round to -inf 438 FLT_ROUNDS_, 439 440 /// X = FP_ROUND_INREG(Y, VT) - This operator takes an FP register, and 441 /// rounds it to a floating point value. It then promotes it and returns it 442 /// in a register of the same size. This operation effectively just 443 /// discards excess precision. The type to round down to is specified by 444 /// the VT operand, a VTSDNode. 445 FP_ROUND_INREG, 446 447 /// X = FP_EXTEND(Y) - Extend a smaller FP type into a larger FP type. 448 FP_EXTEND, 449 450 // BIT_CONVERT - Theis operator converts between integer and FP values, as 451 // if one was stored to memory as integer and the other was loaded from the 452 // same address (or equivalently for vector format conversions, etc). The 453 // source and result are required to have the same bit size (e.g. 454 // f32 <-> i32). This can also be used for int-to-int or fp-to-fp 455 // conversions, but that is a noop, deleted by getNode(). 456 BIT_CONVERT, 457 458 // CONVERT_RNDSAT - This operator is used to support various conversions 459 // between various types (float, signed, unsigned and vectors of those 460 // types) with rounding and saturation. NOTE: Avoid using this operator as 461 // most target don't support it and the operator might be removed in the 462 // future. It takes the following arguments: 463 // 0) value 464 // 1) dest type (type to convert to) 465 // 2) src type (type to convert from) 466 // 3) rounding imm 467 // 4) saturation imm 468 // 5) ISD::CvtCode indicating the type of conversion to do 469 CONVERT_RNDSAT, 470 471 // FNEG, FABS, FSQRT, FSIN, FCOS, FPOWI, FPOW, 472 // FLOG, FLOG2, FLOG10, FEXP, FEXP2, 473 // FCEIL, FTRUNC, FRINT, FNEARBYINT, FFLOOR - Perform various unary floating 474 // point operations. These are inspired by libm. 475 FNEG, FABS, FSQRT, FSIN, FCOS, FPOWI, FPOW, 476 FLOG, FLOG2, FLOG10, FEXP, FEXP2, 477 FCEIL, FTRUNC, FRINT, FNEARBYINT, FFLOOR, 478 479 // LOAD and STORE have token chains as their first operand, then the same 480 // operands as an LLVM load/store instruction, then an offset node that 481 // is added / subtracted from the base pointer to form the address (for 482 // indexed memory ops). 483 LOAD, STORE, 484 485 // DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned 486 // to a specified boundary. This node always has two return values: a new 487 // stack pointer value and a chain. The first operand is the token chain, 488 // the second is the number of bytes to allocate, and the third is the 489 // alignment boundary. The size is guaranteed to be a multiple of the stack 490 // alignment, and the alignment is guaranteed to be bigger than the stack 491 // alignment (if required) or 0 to get standard stack alignment. 492 DYNAMIC_STACKALLOC, 493 494 // Control flow instructions. These all have token chains. 495 496 // BR - Unconditional branch. The first operand is the chain 497 // operand, the second is the MBB to branch to. 498 BR, 499 500 // BRIND - Indirect branch. The first operand is the chain, the second 501 // is the value to branch to, which must be of the same type as the target's 502 // pointer type. 503 BRIND, 504 505 // BR_JT - Jumptable branch. The first operand is the chain, the second 506 // is the jumptable index, the last one is the jumptable entry index. 507 BR_JT, 508 509 // BRCOND - Conditional branch. The first operand is the chain, the 510 // second is the condition, the third is the block to branch to if the 511 // condition is true. If the type of the condition is not i1, then the 512 // high bits must conform to getBooleanContents. 513 BRCOND, 514 515 // BR_CC - Conditional branch. The behavior is like that of SELECT_CC, in 516 // that the condition is represented as condition code, and two nodes to 517 // compare, rather than as a combined SetCC node. The operands in order are 518 // chain, cc, lhs, rhs, block to branch to if condition is true. 519 BR_CC, 520 521 // RET - Return from function. The first operand is the chain, 522 // and any subsequent operands are pairs of return value and return value 523 // attributes (see CALL for description of attributes) for the function. 524 // This operation can have variable number of operands. 525 RET, 526 527 // INLINEASM - Represents an inline asm block. This node always has two 528 // return values: a chain and a flag result. The inputs are as follows: 529 // Operand #0 : Input chain. 530 // Operand #1 : a ExternalSymbolSDNode with a pointer to the asm string. 531 // Operand #2n+2: A RegisterNode. 532 // Operand #2n+3: A TargetConstant, indicating if the reg is a use/def 533 // Operand #last: Optional, an incoming flag. 534 INLINEASM, 535 536 // DBG_LABEL, EH_LABEL - Represents a label in mid basic block used to track 537 // locations needed for debug and exception handling tables. These nodes 538 // take a chain as input and return a chain. 539 DBG_LABEL, 540 EH_LABEL, 541 542 // DECLARE - Represents a llvm.dbg.declare intrinsic. It's used to track 543 // local variable declarations for debugging information. First operand is 544 // a chain, while the next two operands are first two arguments (address 545 // and variable) of a llvm.dbg.declare instruction. 546 DECLARE, 547 548 // STACKSAVE - STACKSAVE has one operand, an input chain. It produces a 549 // value, the same type as the pointer type for the system, and an output 550 // chain. 551 STACKSAVE, 552 553 // STACKRESTORE has two operands, an input chain and a pointer to restore to 554 // it returns an output chain. 555 STACKRESTORE, 556 557 // CALLSEQ_START/CALLSEQ_END - These operators mark the beginning and end of 558 // a call sequence, and carry arbitrary information that target might want 559 // to know. The first operand is a chain, the rest are specified by the 560 // target and not touched by the DAG optimizers. 561 // CALLSEQ_START..CALLSEQ_END pairs may not be nested. 562 CALLSEQ_START, // Beginning of a call sequence 563 CALLSEQ_END, // End of a call sequence 564 565 // VAARG - VAARG has three operands: an input chain, a pointer, and a 566 // SRCVALUE. It returns a pair of values: the vaarg value and a new chain. 567 VAARG, 568 569 // VACOPY - VACOPY has five operands: an input chain, a destination pointer, 570 // a source pointer, a SRCVALUE for the destination, and a SRCVALUE for the 571 // source. 572 VACOPY, 573 574 // VAEND, VASTART - VAEND and VASTART have three operands: an input chain, a 575 // pointer, and a SRCVALUE. 576 VAEND, VASTART, 577 578 // SRCVALUE - This is a node type that holds a Value* that is used to 579 // make reference to a value in the LLVM IR. 580 SRCVALUE, 581 582 // MEMOPERAND - This is a node that contains a MachineMemOperand which 583 // records information about a memory reference. This is used to make 584 // AliasAnalysis queries from the backend. 585 MEMOPERAND, 586 587 // PCMARKER - This corresponds to the pcmarker intrinsic. 588 PCMARKER, 589 590 // READCYCLECOUNTER - This corresponds to the readcyclecounter intrinsic. 591 // The only operand is a chain and a value and a chain are produced. The 592 // value is the contents of the architecture specific cycle counter like 593 // register (or other high accuracy low latency clock source) 594 READCYCLECOUNTER, 595 596 // HANDLENODE node - Used as a handle for various purposes. 597 HANDLENODE, 598 599 // DBG_STOPPOINT - This node is used to represent a source location for 600 // debug info. It takes token chain as input, and carries a line number, 601 // column number, and a pointer to a CompileUnit object identifying 602 // the containing compilation unit. It produces a token chain as output. 603 DBG_STOPPOINT, 604 605 // DEBUG_LOC - This node is used to represent source line information 606 // embedded in the code. It takes a token chain as input, then a line 607 // number, then a column then a file id (provided by MachineModuleInfo.) It 608 // produces a token chain as output. 609 DEBUG_LOC, 610 611 // TRAMPOLINE - This corresponds to the init_trampoline intrinsic. 612 // It takes as input a token chain, the pointer to the trampoline, 613 // the pointer to the nested function, the pointer to pass for the 614 // 'nest' parameter, a SRCVALUE for the trampoline and another for 615 // the nested function (allowing targets to access the original 616 // Function*). It produces the result of the intrinsic and a token 617 // chain as output. 618 TRAMPOLINE, 619 620 // TRAP - Trapping instruction 621 TRAP, 622 623 // PREFETCH - This corresponds to a prefetch intrinsic. It takes chains are 624 // their first operand. The other operands are the address to prefetch, 625 // read / write specifier, and locality specifier. 626 PREFETCH, 627 628 // OUTCHAIN = MEMBARRIER(INCHAIN, load-load, load-store, store-load, 629 // store-store, device) 630 // This corresponds to the memory.barrier intrinsic. 631 // it takes an input chain, 4 operands to specify the type of barrier, an 632 // operand specifying if the barrier applies to device and uncached memory 633 // and produces an output chain. 634 MEMBARRIER, 635 636 // Val, OUTCHAIN = ATOMIC_CMP_SWAP(INCHAIN, ptr, cmp, swap) 637 // this corresponds to the atomic.lcs intrinsic. 638 // cmp is compared to *ptr, and if equal, swap is stored in *ptr. 639 // the return is always the original value in *ptr 640 ATOMIC_CMP_SWAP, 641 642 // Val, OUTCHAIN = ATOMIC_SWAP(INCHAIN, ptr, amt) 643 // this corresponds to the atomic.swap intrinsic. 644 // amt is stored to *ptr atomically. 645 // the return is always the original value in *ptr 646 ATOMIC_SWAP, 647 648 // Val, OUTCHAIN = ATOMIC_LOAD_[OpName](INCHAIN, ptr, amt) 649 // this corresponds to the atomic.load.[OpName] intrinsic. 650 // op(*ptr, amt) is stored to *ptr atomically. 651 // the return is always the original value in *ptr 652 ATOMIC_LOAD_ADD, 653 ATOMIC_LOAD_SUB, 654 ATOMIC_LOAD_AND, 655 ATOMIC_LOAD_OR, 656 ATOMIC_LOAD_XOR, 657 ATOMIC_LOAD_NAND, 658 ATOMIC_LOAD_MIN, 659 ATOMIC_LOAD_MAX, 660 ATOMIC_LOAD_UMIN, 661 ATOMIC_LOAD_UMAX, 662 663 // BUILTIN_OP_END - This must be the last enum value in this list. 664 BUILTIN_OP_END 665 }; 666 667 /// Node predicates 668 669 /// isBuildVectorAllOnes - Return true if the specified node is a 670 /// BUILD_VECTOR where all of the elements are ~0 or undef. 671 bool isBuildVectorAllOnes(const SDNode *N); 672 673 /// isBuildVectorAllZeros - Return true if the specified node is a 674 /// BUILD_VECTOR where all of the elements are 0 or undef. 675 bool isBuildVectorAllZeros(const SDNode *N); 676 677 /// isScalarToVector - Return true if the specified node is a 678 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low 679 /// element is not an undef. 680 bool isScalarToVector(const SDNode *N); 681 682 /// isDebugLabel - Return true if the specified node represents a debug 683 /// label (i.e. ISD::DBG_LABEL or TargetInstrInfo::DBG_LABEL node). 684 bool isDebugLabel(const SDNode *N); 685 686 //===--------------------------------------------------------------------===// 687 /// MemIndexedMode enum - This enum defines the load / store indexed 688 /// addressing modes. 689 /// 690 /// UNINDEXED "Normal" load / store. The effective address is already 691 /// computed and is available in the base pointer. The offset 692 /// operand is always undefined. In addition to producing a 693 /// chain, an unindexed load produces one value (result of the 694 /// load); an unindexed store does not produce a value. 695 /// 696 /// PRE_INC Similar to the unindexed mode where the effective address is 697 /// PRE_DEC the value of the base pointer add / subtract the offset. 698 /// It considers the computation as being folded into the load / 699 /// store operation (i.e. the load / store does the address 700 /// computation as well as performing the memory transaction). 701 /// The base operand is always undefined. In addition to 702 /// producing a chain, pre-indexed load produces two values 703 /// (result of the load and the result of the address 704 /// computation); a pre-indexed store produces one value (result 705 /// of the address computation). 706 /// 707 /// POST_INC The effective address is the value of the base pointer. The 708 /// POST_DEC value of the offset operand is then added to / subtracted 709 /// from the base after memory transaction. In addition to 710 /// producing a chain, post-indexed load produces two values 711 /// (the result of the load and the result of the base +/- offset 712 /// computation); a post-indexed store produces one value (the 713 /// the result of the base +/- offset computation). 714 /// 715 enum MemIndexedMode { 716 UNINDEXED = 0, 717 PRE_INC, 718 PRE_DEC, 719 POST_INC, 720 POST_DEC, 721 LAST_INDEXED_MODE 722 }; 723 724 //===--------------------------------------------------------------------===// 725 /// LoadExtType enum - This enum defines the three variants of LOADEXT 726 /// (load with extension). 727 /// 728 /// SEXTLOAD loads the integer operand and sign extends it to a larger 729 /// integer result type. 730 /// ZEXTLOAD loads the integer operand and zero extends it to a larger 731 /// integer result type. 732 /// EXTLOAD is used for three things: floating point extending loads, 733 /// integer extending loads [the top bits are undefined], and vector 734 /// extending loads [load into low elt]. 735 /// 736 enum LoadExtType { 737 NON_EXTLOAD = 0, 738 EXTLOAD, 739 SEXTLOAD, 740 ZEXTLOAD, 741 LAST_LOADEXT_TYPE 742 }; 743 744 //===--------------------------------------------------------------------===// 745 /// ISD::CondCode enum - These are ordered carefully to make the bitfields 746 /// below work out, when considering SETFALSE (something that never exists 747 /// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered 748 /// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal 749 /// to. If the "N" column is 1, the result of the comparison is undefined if 750 /// the input is a NAN. 751 /// 752 /// All of these (except for the 'always folded ops') should be handled for 753 /// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT, 754 /// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used. 755 /// 756 /// Note that these are laid out in a specific order to allow bit-twiddling 757 /// to transform conditions. 758 enum CondCode { 759 // Opcode N U L G E Intuitive operation 760 SETFALSE, // 0 0 0 0 Always false (always folded) 761 SETOEQ, // 0 0 0 1 True if ordered and equal 762 SETOGT, // 0 0 1 0 True if ordered and greater than 763 SETOGE, // 0 0 1 1 True if ordered and greater than or equal 764 SETOLT, // 0 1 0 0 True if ordered and less than 765 SETOLE, // 0 1 0 1 True if ordered and less than or equal 766 SETONE, // 0 1 1 0 True if ordered and operands are unequal 767 SETO, // 0 1 1 1 True if ordered (no nans) 768 SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y) 769 SETUEQ, // 1 0 0 1 True if unordered or equal 770 SETUGT, // 1 0 1 0 True if unordered or greater than 771 SETUGE, // 1 0 1 1 True if unordered, greater than, or equal 772 SETULT, // 1 1 0 0 True if unordered or less than 773 SETULE, // 1 1 0 1 True if unordered, less than, or equal 774 SETUNE, // 1 1 1 0 True if unordered or not equal 775 SETTRUE, // 1 1 1 1 Always true (always folded) 776 // Don't care operations: undefined if the input is a nan. 777 SETFALSE2, // 1 X 0 0 0 Always false (always folded) 778 SETEQ, // 1 X 0 0 1 True if equal 779 SETGT, // 1 X 0 1 0 True if greater than 780 SETGE, // 1 X 0 1 1 True if greater than or equal 781 SETLT, // 1 X 1 0 0 True if less than 782 SETLE, // 1 X 1 0 1 True if less than or equal 783 SETNE, // 1 X 1 1 0 True if not equal 784 SETTRUE2, // 1 X 1 1 1 Always true (always folded) 785 786 SETCC_INVALID // Marker value. 787 }; 788 789 /// isSignedIntSetCC - Return true if this is a setcc instruction that 790 /// performs a signed comparison when used with integer operands. 791 inline bool isSignedIntSetCC(CondCode Code) { 792 return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE; 793 } 794 795 /// isUnsignedIntSetCC - Return true if this is a setcc instruction that 796 /// performs an unsigned comparison when used with integer operands. 797 inline bool isUnsignedIntSetCC(CondCode Code) { 798 return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE; 799 } 800 801 /// isTrueWhenEqual - Return true if the specified condition returns true if 802 /// the two operands to the condition are equal. Note that if one of the two 803 /// operands is a NaN, this value is meaningless. 804 inline bool isTrueWhenEqual(CondCode Cond) { 805 return ((int)Cond & 1) != 0; 806 } 807 808 /// getUnorderedFlavor - This function returns 0 if the condition is always 809 /// false if an operand is a NaN, 1 if the condition is always true if the 810 /// operand is a NaN, and 2 if the condition is undefined if the operand is a 811 /// NaN. 812 inline unsigned getUnorderedFlavor(CondCode Cond) { 813 return ((int)Cond >> 3) & 3; 814 } 815 816 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where 817 /// 'op' is a valid SetCC operation. 818 CondCode getSetCCInverse(CondCode Operation, bool isInteger); 819 820 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 821 /// when given the operation for (X op Y). 822 CondCode getSetCCSwappedOperands(CondCode Operation); 823 824 /// getSetCCOrOperation - Return the result of a logical OR between different 825 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This 826 /// function returns SETCC_INVALID if it is not possible to represent the 827 /// resultant comparison. 828 CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger); 829 830 /// getSetCCAndOperation - Return the result of a logical AND between 831 /// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 832 /// function returns SETCC_INVALID if it is not possible to represent the 833 /// resultant comparison. 834 CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger); 835 836 //===--------------------------------------------------------------------===// 837 /// CvtCode enum - This enum defines the various converts CONVERT_RNDSAT 838 /// supports. 839 enum CvtCode { 840 CVT_FF, // Float from Float 841 CVT_FS, // Float from Signed 842 CVT_FU, // Float from Unsigned 843 CVT_SF, // Signed from Float 844 CVT_UF, // Unsigned from Float 845 CVT_SS, // Signed from Signed 846 CVT_SU, // Signed from Unsigned 847 CVT_US, // Unsigned from Signed 848 CVT_UU, // Unsigned from Unsigned 849 CVT_INVALID // Marker - Invalid opcode 850 }; 851} // end llvm::ISD namespace 852 853 854//===----------------------------------------------------------------------===// 855/// SDValue - Unlike LLVM values, Selection DAG nodes may return multiple 856/// values as the result of a computation. Many nodes return multiple values, 857/// from loads (which define a token and a return value) to ADDC (which returns 858/// a result and a carry value), to calls (which may return an arbitrary number 859/// of values). 860/// 861/// As such, each use of a SelectionDAG computation must indicate the node that 862/// computes it as well as which return value to use from that node. This pair 863/// of information is represented with the SDValue value type. 864/// 865class SDValue { 866 SDNode *Node; // The node defining the value we are using. 867 unsigned ResNo; // Which return value of the node we are using. 868public: 869 SDValue() : Node(0), ResNo(0) {} 870 SDValue(SDNode *node, unsigned resno) : Node(node), ResNo(resno) {} 871 872 /// get the index which selects a specific result in the SDNode 873 unsigned getResNo() const { return ResNo; } 874 875 /// get the SDNode which holds the desired result 876 SDNode *getNode() const { return Node; } 877 878 /// set the SDNode 879 void setNode(SDNode *N) { Node = N; } 880 881 bool operator==(const SDValue &O) const { 882 return Node == O.Node && ResNo == O.ResNo; 883 } 884 bool operator!=(const SDValue &O) const { 885 return !operator==(O); 886 } 887 bool operator<(const SDValue &O) const { 888 return Node < O.Node || (Node == O.Node && ResNo < O.ResNo); 889 } 890 891 SDValue getValue(unsigned R) const { 892 return SDValue(Node, R); 893 } 894 895 // isOperandOf - Return true if this node is an operand of N. 896 bool isOperandOf(SDNode *N) const; 897 898 /// getValueType - Return the ValueType of the referenced return value. 899 /// 900 inline MVT getValueType() const; 901 902 /// getValueSizeInBits - Returns the size of the value in bits. 903 /// 904 unsigned getValueSizeInBits() const { 905 return getValueType().getSizeInBits(); 906 } 907 908 // Forwarding methods - These forward to the corresponding methods in SDNode. 909 inline unsigned getOpcode() const; 910 inline unsigned getNumOperands() const; 911 inline const SDValue &getOperand(unsigned i) const; 912 inline uint64_t getConstantOperandVal(unsigned i) const; 913 inline bool isTargetOpcode() const; 914 inline bool isMachineOpcode() const; 915 inline unsigned getMachineOpcode() const; 916 inline const DebugLoc getDebugLoc() const; 917 918 919 /// reachesChainWithoutSideEffects - Return true if this operand (which must 920 /// be a chain) reaches the specified operand without crossing any 921 /// side-effecting instructions. In practice, this looks through token 922 /// factors and non-volatile loads. In order to remain efficient, this only 923 /// looks a couple of nodes in, it does not do an exhaustive search. 924 bool reachesChainWithoutSideEffects(SDValue Dest, 925 unsigned Depth = 2) const; 926 927 /// use_empty - Return true if there are no nodes using value ResNo 928 /// of Node. 929 /// 930 inline bool use_empty() const; 931 932 /// hasOneUse - Return true if there is exactly one node using value 933 /// ResNo of Node. 934 /// 935 inline bool hasOneUse() const; 936}; 937 938 939template<> struct DenseMapInfo<SDValue> { 940 static inline SDValue getEmptyKey() { 941 return SDValue((SDNode*)-1, -1U); 942 } 943 static inline SDValue getTombstoneKey() { 944 return SDValue((SDNode*)-1, 0); 945 } 946 static unsigned getHashValue(const SDValue &Val) { 947 return ((unsigned)((uintptr_t)Val.getNode() >> 4) ^ 948 (unsigned)((uintptr_t)Val.getNode() >> 9)) + Val.getResNo(); 949 } 950 static bool isEqual(const SDValue &LHS, const SDValue &RHS) { 951 return LHS == RHS; 952 } 953 static bool isPod() { return true; } 954}; 955 956/// simplify_type specializations - Allow casting operators to work directly on 957/// SDValues as if they were SDNode*'s. 958template<> struct simplify_type<SDValue> { 959 typedef SDNode* SimpleType; 960 static SimpleType getSimplifiedValue(const SDValue &Val) { 961 return static_cast<SimpleType>(Val.getNode()); 962 } 963}; 964template<> struct simplify_type<const SDValue> { 965 typedef SDNode* SimpleType; 966 static SimpleType getSimplifiedValue(const SDValue &Val) { 967 return static_cast<SimpleType>(Val.getNode()); 968 } 969}; 970 971/// SDUse - Represents a use of a SDNode. This class holds an SDValue, 972/// which records the SDNode being used and the result number, a 973/// pointer to the SDNode using the value, and Next and Prev pointers, 974/// which link together all the uses of an SDNode. 975/// 976class SDUse { 977 /// Val - The value being used. 978 SDValue Val; 979 /// User - The user of this value. 980 SDNode *User; 981 /// Prev, Next - Pointers to the uses list of the SDNode referred by 982 /// this operand. 983 SDUse **Prev, *Next; 984 985 SDUse(const SDUse &U); // Do not implement 986 void operator=(const SDUse &U); // Do not implement 987 988public: 989 SDUse() : Val(), User(NULL), Prev(NULL), Next(NULL) {} 990 991 /// Normally SDUse will just implicitly convert to an SDValue that it holds. 992 operator const SDValue&() const { return Val; } 993 994 /// If implicit conversion to SDValue doesn't work, the get() method returns 995 /// the SDValue. 996 const SDValue &get() const { return Val; } 997 998 /// getUser - This returns the SDNode that contains this Use. 999 SDNode *getUser() { return User; } 1000 1001 /// getNext - Get the next SDUse in the use list. 1002 SDUse *getNext() const { return Next; } 1003 1004 /// getNode - Convenience function for get().getNode(). 1005 SDNode *getNode() const { return Val.getNode(); } 1006 /// getResNo - Convenience function for get().getResNo(). 1007 unsigned getResNo() const { return Val.getResNo(); } 1008 /// getValueType - Convenience function for get().getValueType(). 1009 MVT getValueType() const { return Val.getValueType(); } 1010 1011 /// operator== - Convenience function for get().operator== 1012 bool operator==(const SDValue &V) const { 1013 return Val == V; 1014 } 1015 1016 /// operator!= - Convenience function for get().operator!= 1017 bool operator!=(const SDValue &V) const { 1018 return Val != V; 1019 } 1020 1021 /// operator< - Convenience function for get().operator< 1022 bool operator<(const SDValue &V) const { 1023 return Val < V; 1024 } 1025 1026private: 1027 friend class SelectionDAG; 1028 friend class SDNode; 1029 1030 void setUser(SDNode *p) { User = p; } 1031 1032 /// set - Remove this use from its existing use list, assign it the 1033 /// given value, and add it to the new value's node's use list. 1034 inline void set(const SDValue &V); 1035 /// setInitial - like set, but only supports initializing a newly-allocated 1036 /// SDUse with a non-null value. 1037 inline void setInitial(const SDValue &V); 1038 /// setNode - like set, but only sets the Node portion of the value, 1039 /// leaving the ResNo portion unmodified. 1040 inline void setNode(SDNode *N); 1041 1042 void addToList(SDUse **List) { 1043 Next = *List; 1044 if (Next) Next->Prev = &Next; 1045 Prev = List; 1046 *List = this; 1047 } 1048 1049 void removeFromList() { 1050 *Prev = Next; 1051 if (Next) Next->Prev = Prev; 1052 } 1053}; 1054 1055/// simplify_type specializations - Allow casting operators to work directly on 1056/// SDValues as if they were SDNode*'s. 1057template<> struct simplify_type<SDUse> { 1058 typedef SDNode* SimpleType; 1059 static SimpleType getSimplifiedValue(const SDUse &Val) { 1060 return static_cast<SimpleType>(Val.getNode()); 1061 } 1062}; 1063template<> struct simplify_type<const SDUse> { 1064 typedef SDNode* SimpleType; 1065 static SimpleType getSimplifiedValue(const SDUse &Val) { 1066 return static_cast<SimpleType>(Val.getNode()); 1067 } 1068}; 1069 1070 1071/// SDNode - Represents one node in the SelectionDAG. 1072/// 1073class SDNode : public FoldingSetNode, public ilist_node<SDNode> { 1074private: 1075 /// NodeType - The operation that this node performs. 1076 /// 1077 short NodeType; 1078 1079 /// OperandsNeedDelete - This is true if OperandList was new[]'d. If true, 1080 /// then they will be delete[]'d when the node is destroyed. 1081 unsigned short OperandsNeedDelete : 1; 1082 1083protected: 1084 /// SubclassData - This member is defined by this class, but is not used for 1085 /// anything. Subclasses can use it to hold whatever state they find useful. 1086 /// This field is initialized to zero by the ctor. 1087 unsigned short SubclassData : 15; 1088 1089private: 1090 /// NodeId - Unique id per SDNode in the DAG. 1091 int NodeId; 1092 1093 /// OperandList - The values that are used by this operation. 1094 /// 1095 SDUse *OperandList; 1096 1097 /// ValueList - The types of the values this node defines. SDNode's may 1098 /// define multiple values simultaneously. 1099 const MVT *ValueList; 1100 1101 /// UseList - List of uses for this SDNode. 1102 SDUse *UseList; 1103 1104 /// NumOperands/NumValues - The number of entries in the Operand/Value list. 1105 unsigned short NumOperands, NumValues; 1106 1107 /// debugLoc - source line information. 1108 DebugLoc debugLoc; 1109 1110 /// getValueTypeList - Return a pointer to the specified value type. 1111 static const MVT *getValueTypeList(MVT VT); 1112 1113 friend class SelectionDAG; 1114 friend struct ilist_traits<SDNode>; 1115 1116public: 1117 //===--------------------------------------------------------------------===// 1118 // Accessors 1119 // 1120 1121 /// getOpcode - Return the SelectionDAG opcode value for this node. For 1122 /// pre-isel nodes (those for which isMachineOpcode returns false), these 1123 /// are the opcode values in the ISD and <target>ISD namespaces. For 1124 /// post-isel opcodes, see getMachineOpcode. 1125 unsigned getOpcode() const { return (unsigned short)NodeType; } 1126 1127 /// isTargetOpcode - Test if this node has a target-specific opcode (in the 1128 /// <target>ISD namespace). 1129 bool isTargetOpcode() const { return NodeType >= ISD::BUILTIN_OP_END; } 1130 1131 /// isMachineOpcode - Test if this node has a post-isel opcode, directly 1132 /// corresponding to a MachineInstr opcode. 1133 bool isMachineOpcode() const { return NodeType < 0; } 1134 1135 /// getMachineOpcode - This may only be called if isMachineOpcode returns 1136 /// true. It returns the MachineInstr opcode value that the node's opcode 1137 /// corresponds to. 1138 unsigned getMachineOpcode() const { 1139 assert(isMachineOpcode() && "Not a MachineInstr opcode!"); 1140 return ~NodeType; 1141 } 1142 1143 /// use_empty - Return true if there are no uses of this node. 1144 /// 1145 bool use_empty() const { return UseList == NULL; } 1146 1147 /// hasOneUse - Return true if there is exactly one use of this node. 1148 /// 1149 bool hasOneUse() const { 1150 return !use_empty() && next(use_begin()) == use_end(); 1151 } 1152 1153 /// use_size - Return the number of uses of this node. This method takes 1154 /// time proportional to the number of uses. 1155 /// 1156 size_t use_size() const { return std::distance(use_begin(), use_end()); } 1157 1158 /// getNodeId - Return the unique node id. 1159 /// 1160 int getNodeId() const { return NodeId; } 1161 1162 /// setNodeId - Set unique node id. 1163 void setNodeId(int Id) { NodeId = Id; } 1164 1165 /// getDebugLoc - Return the source location info. 1166 const DebugLoc getDebugLoc() const { return debugLoc; } 1167 1168 /// setDebugLoc - Set source location info. Try to avoid this, putting 1169 /// it in the constructor is preferable. 1170 void setDebugLoc(const DebugLoc dl) { debugLoc = dl; } 1171 1172 /// use_iterator - This class provides iterator support for SDUse 1173 /// operands that use a specific SDNode. 1174 class use_iterator 1175 : public forward_iterator<SDUse, ptrdiff_t> { 1176 SDUse *Op; 1177 explicit use_iterator(SDUse *op) : Op(op) { 1178 } 1179 friend class SDNode; 1180 public: 1181 typedef forward_iterator<SDUse, ptrdiff_t>::reference reference; 1182 typedef forward_iterator<SDUse, ptrdiff_t>::pointer pointer; 1183 1184 use_iterator(const use_iterator &I) : Op(I.Op) {} 1185 use_iterator() : Op(0) {} 1186 1187 bool operator==(const use_iterator &x) const { 1188 return Op == x.Op; 1189 } 1190 bool operator!=(const use_iterator &x) const { 1191 return !operator==(x); 1192 } 1193 1194 /// atEnd - return true if this iterator is at the end of uses list. 1195 bool atEnd() const { return Op == 0; } 1196 1197 // Iterator traversal: forward iteration only. 1198 use_iterator &operator++() { // Preincrement 1199 assert(Op && "Cannot increment end iterator!"); 1200 Op = Op->getNext(); 1201 return *this; 1202 } 1203 1204 use_iterator operator++(int) { // Postincrement 1205 use_iterator tmp = *this; ++*this; return tmp; 1206 } 1207 1208 /// Retrieve a pointer to the current user node. 1209 SDNode *operator*() const { 1210 assert(Op && "Cannot dereference end iterator!"); 1211 return Op->getUser(); 1212 } 1213 1214 SDNode *operator->() const { return operator*(); } 1215 1216 SDUse &getUse() const { return *Op; } 1217 1218 /// getOperandNo - Retrieve the operand # of this use in its user. 1219 /// 1220 unsigned getOperandNo() const { 1221 assert(Op && "Cannot dereference end iterator!"); 1222 return (unsigned)(Op - Op->getUser()->OperandList); 1223 } 1224 }; 1225 1226 /// use_begin/use_end - Provide iteration support to walk over all uses 1227 /// of an SDNode. 1228 1229 use_iterator use_begin() const { 1230 return use_iterator(UseList); 1231 } 1232 1233 static use_iterator use_end() { return use_iterator(0); } 1234 1235 1236 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 1237 /// indicated value. This method ignores uses of other values defined by this 1238 /// operation. 1239 bool hasNUsesOfValue(unsigned NUses, unsigned Value) const; 1240 1241 /// hasAnyUseOfValue - Return true if there are any use of the indicated 1242 /// value. This method ignores uses of other values defined by this operation. 1243 bool hasAnyUseOfValue(unsigned Value) const; 1244 1245 /// isOnlyUserOf - Return true if this node is the only use of N. 1246 /// 1247 bool isOnlyUserOf(SDNode *N) const; 1248 1249 /// isOperandOf - Return true if this node is an operand of N. 1250 /// 1251 bool isOperandOf(SDNode *N) const; 1252 1253 /// isPredecessorOf - Return true if this node is a predecessor of N. This 1254 /// node is either an operand of N or it can be reached by recursively 1255 /// traversing up the operands. 1256 /// NOTE: this is an expensive method. Use it carefully. 1257 bool isPredecessorOf(SDNode *N) const; 1258 1259 /// getNumOperands - Return the number of values used by this operation. 1260 /// 1261 unsigned getNumOperands() const { return NumOperands; } 1262 1263 /// getConstantOperandVal - Helper method returns the integer value of a 1264 /// ConstantSDNode operand. 1265 uint64_t getConstantOperandVal(unsigned Num) const; 1266 1267 const SDValue &getOperand(unsigned Num) const { 1268 assert(Num < NumOperands && "Invalid child # of SDNode!"); 1269 return OperandList[Num]; 1270 } 1271 1272 typedef SDUse* op_iterator; 1273 op_iterator op_begin() const { return OperandList; } 1274 op_iterator op_end() const { return OperandList+NumOperands; } 1275 1276 SDVTList getVTList() const { 1277 SDVTList X = { ValueList, NumValues }; 1278 return X; 1279 }; 1280 1281 /// getFlaggedNode - If this node has a flag operand, return the node 1282 /// to which the flag operand points. Otherwise return NULL. 1283 SDNode *getFlaggedNode() const { 1284 if (getNumOperands() != 0 && 1285 getOperand(getNumOperands()-1).getValueType() == MVT::Flag) 1286 return getOperand(getNumOperands()-1).getNode(); 1287 return 0; 1288 } 1289 1290 // If this is a pseudo op, like copyfromreg, look to see if there is a 1291 // real target node flagged to it. If so, return the target node. 1292 const SDNode *getFlaggedMachineNode() const { 1293 const SDNode *FoundNode = this; 1294 1295 // Climb up flag edges until a machine-opcode node is found, or the 1296 // end of the chain is reached. 1297 while (!FoundNode->isMachineOpcode()) { 1298 const SDNode *N = FoundNode->getFlaggedNode(); 1299 if (!N) break; 1300 FoundNode = N; 1301 } 1302 1303 return FoundNode; 1304 } 1305 1306 /// getNumValues - Return the number of values defined/returned by this 1307 /// operator. 1308 /// 1309 unsigned getNumValues() const { return NumValues; } 1310 1311 /// getValueType - Return the type of a specified result. 1312 /// 1313 MVT getValueType(unsigned ResNo) const { 1314 assert(ResNo < NumValues && "Illegal result number!"); 1315 return ValueList[ResNo]; 1316 } 1317 1318 /// getValueSizeInBits - Returns MVT::getSizeInBits(getValueType(ResNo)). 1319 /// 1320 unsigned getValueSizeInBits(unsigned ResNo) const { 1321 return getValueType(ResNo).getSizeInBits(); 1322 } 1323 1324 typedef const MVT* value_iterator; 1325 value_iterator value_begin() const { return ValueList; } 1326 value_iterator value_end() const { return ValueList+NumValues; } 1327 1328 /// getOperationName - Return the opcode of this operation for printing. 1329 /// 1330 std::string getOperationName(const SelectionDAG *G = 0) const; 1331 static const char* getIndexedModeName(ISD::MemIndexedMode AM); 1332 void print_types(raw_ostream &OS, const SelectionDAG *G) const; 1333 void print_details(raw_ostream &OS, const SelectionDAG *G) const; 1334 void print(raw_ostream &OS, const SelectionDAG *G = 0) const; 1335 void printr(raw_ostream &OS, const SelectionDAG *G = 0) const; 1336 void dump() const; 1337 void dumpr() const; 1338 void dump(const SelectionDAG *G) const; 1339 1340 static bool classof(const SDNode *) { return true; } 1341 1342 /// Profile - Gather unique data for the node. 1343 /// 1344 void Profile(FoldingSetNodeID &ID) const; 1345 1346 /// addUse - This method should only be used by the SDUse class. 1347 /// 1348 void addUse(SDUse &U) { U.addToList(&UseList); } 1349 1350protected: 1351 static SDVTList getSDVTList(MVT VT) { 1352 SDVTList Ret = { getValueTypeList(VT), 1 }; 1353 return Ret; 1354 } 1355 1356 SDNode(unsigned Opc, const DebugLoc dl, SDVTList VTs, const SDValue *Ops, 1357 unsigned NumOps) 1358 : NodeType(Opc), OperandsNeedDelete(true), SubclassData(0), 1359 NodeId(-1), 1360 OperandList(NumOps ? new SDUse[NumOps] : 0), 1361 ValueList(VTs.VTs), UseList(NULL), 1362 NumOperands(NumOps), NumValues(VTs.NumVTs), 1363 debugLoc(dl) { 1364 for (unsigned i = 0; i != NumOps; ++i) { 1365 OperandList[i].setUser(this); 1366 OperandList[i].setInitial(Ops[i]); 1367 } 1368 } 1369 1370 /// This constructor adds no operands itself; operands can be 1371 /// set later with InitOperands. 1372 SDNode(unsigned Opc, const DebugLoc dl, SDVTList VTs) 1373 : NodeType(Opc), OperandsNeedDelete(false), SubclassData(0), 1374 NodeId(-1), OperandList(0), ValueList(VTs.VTs), UseList(NULL), 1375 NumOperands(0), NumValues(VTs.NumVTs), 1376 debugLoc(dl) {} 1377 1378 /// InitOperands - Initialize the operands list of this with 1 operand. 1379 void InitOperands(SDUse *Ops, const SDValue &Op0) { 1380 Ops[0].setUser(this); 1381 Ops[0].setInitial(Op0); 1382 NumOperands = 1; 1383 OperandList = Ops; 1384 } 1385 1386 /// InitOperands - Initialize the operands list of this with 2 operands. 1387 void InitOperands(SDUse *Ops, const SDValue &Op0, const SDValue &Op1) { 1388 Ops[0].setUser(this); 1389 Ops[0].setInitial(Op0); 1390 Ops[1].setUser(this); 1391 Ops[1].setInitial(Op1); 1392 NumOperands = 2; 1393 OperandList = Ops; 1394 } 1395 1396 /// InitOperands - Initialize the operands list of this with 3 operands. 1397 void InitOperands(SDUse *Ops, const SDValue &Op0, const SDValue &Op1, 1398 const SDValue &Op2) { 1399 Ops[0].setUser(this); 1400 Ops[0].setInitial(Op0); 1401 Ops[1].setUser(this); 1402 Ops[1].setInitial(Op1); 1403 Ops[2].setUser(this); 1404 Ops[2].setInitial(Op2); 1405 NumOperands = 3; 1406 OperandList = Ops; 1407 } 1408 1409 /// InitOperands - Initialize the operands list of this with 4 operands. 1410 void InitOperands(SDUse *Ops, const SDValue &Op0, const SDValue &Op1, 1411 const SDValue &Op2, const SDValue &Op3) { 1412 Ops[0].setUser(this); 1413 Ops[0].setInitial(Op0); 1414 Ops[1].setUser(this); 1415 Ops[1].setInitial(Op1); 1416 Ops[2].setUser(this); 1417 Ops[2].setInitial(Op2); 1418 Ops[3].setUser(this); 1419 Ops[3].setInitial(Op3); 1420 NumOperands = 4; 1421 OperandList = Ops; 1422 } 1423 1424 /// InitOperands - Initialize the operands list of this with N operands. 1425 void InitOperands(SDUse *Ops, const SDValue *Vals, unsigned N) { 1426 for (unsigned i = 0; i != N; ++i) { 1427 Ops[i].setUser(this); 1428 Ops[i].setInitial(Vals[i]); 1429 } 1430 NumOperands = N; 1431 OperandList = Ops; 1432 } 1433 1434 /// DropOperands - Release the operands and set this node to have 1435 /// zero operands. 1436 void DropOperands(); 1437}; 1438 1439 1440// Define inline functions from the SDValue class. 1441 1442inline unsigned SDValue::getOpcode() const { 1443 return Node->getOpcode(); 1444} 1445inline MVT SDValue::getValueType() const { 1446 return Node->getValueType(ResNo); 1447} 1448inline unsigned SDValue::getNumOperands() const { 1449 return Node->getNumOperands(); 1450} 1451inline const SDValue &SDValue::getOperand(unsigned i) const { 1452 return Node->getOperand(i); 1453} 1454inline uint64_t SDValue::getConstantOperandVal(unsigned i) const { 1455 return Node->getConstantOperandVal(i); 1456} 1457inline bool SDValue::isTargetOpcode() const { 1458 return Node->isTargetOpcode(); 1459} 1460inline bool SDValue::isMachineOpcode() const { 1461 return Node->isMachineOpcode(); 1462} 1463inline unsigned SDValue::getMachineOpcode() const { 1464 return Node->getMachineOpcode(); 1465} 1466inline bool SDValue::use_empty() const { 1467 return !Node->hasAnyUseOfValue(ResNo); 1468} 1469inline bool SDValue::hasOneUse() const { 1470 return Node->hasNUsesOfValue(1, ResNo); 1471} 1472inline const DebugLoc SDValue::getDebugLoc() const { 1473 return Node->getDebugLoc(); 1474} 1475 1476// Define inline functions from the SDUse class. 1477 1478inline void SDUse::set(const SDValue &V) { 1479 if (Val.getNode()) removeFromList(); 1480 Val = V; 1481 if (V.getNode()) V.getNode()->addUse(*this); 1482} 1483 1484inline void SDUse::setInitial(const SDValue &V) { 1485 Val = V; 1486 V.getNode()->addUse(*this); 1487} 1488 1489inline void SDUse::setNode(SDNode *N) { 1490 if (Val.getNode()) removeFromList(); 1491 Val.setNode(N); 1492 if (N) N->addUse(*this); 1493} 1494 1495/// UnarySDNode - This class is used for single-operand SDNodes. This is solely 1496/// to allow co-allocation of node operands with the node itself. 1497class UnarySDNode : public SDNode { 1498 SDUse Op; 1499public: 1500 UnarySDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, SDValue X) 1501 : SDNode(Opc, dl, VTs) { 1502 InitOperands(&Op, X); 1503 } 1504}; 1505 1506/// BinarySDNode - This class is used for two-operand SDNodes. This is solely 1507/// to allow co-allocation of node operands with the node itself. 1508class BinarySDNode : public SDNode { 1509 SDUse Ops[2]; 1510public: 1511 BinarySDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, SDValue X, SDValue Y) 1512 : SDNode(Opc, dl, VTs) { 1513 InitOperands(Ops, X, Y); 1514 } 1515}; 1516 1517/// TernarySDNode - This class is used for three-operand SDNodes. This is solely 1518/// to allow co-allocation of node operands with the node itself. 1519class TernarySDNode : public SDNode { 1520 SDUse Ops[3]; 1521public: 1522 TernarySDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, SDValue X, SDValue Y, 1523 SDValue Z) 1524 : SDNode(Opc, dl, VTs) { 1525 InitOperands(Ops, X, Y, Z); 1526 } 1527}; 1528 1529 1530/// HandleSDNode - This class is used to form a handle around another node that 1531/// is persistant and is updated across invocations of replaceAllUsesWith on its 1532/// operand. This node should be directly created by end-users and not added to 1533/// the AllNodes list. 1534class HandleSDNode : public SDNode { 1535 SDUse Op; 1536public: 1537 // FIXME: Remove the "noinline" attribute once <rdar://problem/5852746> is 1538 // fixed. 1539#ifdef __GNUC__ 1540 explicit __attribute__((__noinline__)) HandleSDNode(SDValue X) 1541#else 1542 explicit HandleSDNode(SDValue X) 1543#endif 1544 : SDNode(ISD::HANDLENODE, DebugLoc::getUnknownLoc(), 1545 getSDVTList(MVT::Other)) { 1546 InitOperands(&Op, X); 1547 } 1548 ~HandleSDNode(); 1549 const SDValue &getValue() const { return Op; } 1550}; 1551 1552/// Abstact virtual class for operations for memory operations 1553class MemSDNode : public SDNode { 1554private: 1555 // MemoryVT - VT of in-memory value. 1556 MVT MemoryVT; 1557 1558 //! SrcValue - Memory location for alias analysis. 1559 const Value *SrcValue; 1560 1561 //! SVOffset - Memory location offset. Note that base is defined in MemSDNode 1562 int SVOffset; 1563 1564public: 1565 MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, MVT MemoryVT, 1566 const Value *srcValue, int SVOff, 1567 unsigned alignment, bool isvolatile); 1568 1569 MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, const SDValue *Ops, 1570 unsigned NumOps, MVT MemoryVT, const Value *srcValue, int SVOff, 1571 unsigned alignment, bool isvolatile); 1572 1573 /// Returns alignment and volatility of the memory access 1574 unsigned getAlignment() const { return (1u << (SubclassData >> 6)) >> 1; } 1575 bool isVolatile() const { return (SubclassData >> 5) & 1; } 1576 1577 /// getRawSubclassData - Return the SubclassData value, which contains an 1578 /// encoding of the alignment and volatile information, as well as bits 1579 /// used by subclasses. This function should only be used to compute a 1580 /// FoldingSetNodeID value. 1581 unsigned getRawSubclassData() const { 1582 return SubclassData; 1583 } 1584 1585 /// Returns the SrcValue and offset that describes the location of the access 1586 const Value *getSrcValue() const { return SrcValue; } 1587 int getSrcValueOffset() const { return SVOffset; } 1588 1589 /// getMemoryVT - Return the type of the in-memory value. 1590 MVT getMemoryVT() const { return MemoryVT; } 1591 1592 /// getMemOperand - Return a MachineMemOperand object describing the memory 1593 /// reference performed by operation. 1594 MachineMemOperand getMemOperand() const; 1595 1596 const SDValue &getChain() const { return getOperand(0); } 1597 const SDValue &getBasePtr() const { 1598 return getOperand(getOpcode() == ISD::STORE ? 2 : 1); 1599 } 1600 1601 // Methods to support isa and dyn_cast 1602 static bool classof(const MemSDNode *) { return true; } 1603 static bool classof(const SDNode *N) { 1604 // For some targets, we lower some target intrinsics to a MemIntrinsicNode 1605 // with either an intrinsic or a target opcode. 1606 return N->getOpcode() == ISD::LOAD || 1607 N->getOpcode() == ISD::STORE || 1608 N->getOpcode() == ISD::ATOMIC_CMP_SWAP || 1609 N->getOpcode() == ISD::ATOMIC_SWAP || 1610 N->getOpcode() == ISD::ATOMIC_LOAD_ADD || 1611 N->getOpcode() == ISD::ATOMIC_LOAD_SUB || 1612 N->getOpcode() == ISD::ATOMIC_LOAD_AND || 1613 N->getOpcode() == ISD::ATOMIC_LOAD_OR || 1614 N->getOpcode() == ISD::ATOMIC_LOAD_XOR || 1615 N->getOpcode() == ISD::ATOMIC_LOAD_NAND || 1616 N->getOpcode() == ISD::ATOMIC_LOAD_MIN || 1617 N->getOpcode() == ISD::ATOMIC_LOAD_MAX || 1618 N->getOpcode() == ISD::ATOMIC_LOAD_UMIN || 1619 N->getOpcode() == ISD::ATOMIC_LOAD_UMAX || 1620 N->getOpcode() == ISD::INTRINSIC_W_CHAIN || 1621 N->getOpcode() == ISD::INTRINSIC_VOID || 1622 N->isTargetOpcode(); 1623 } 1624}; 1625 1626/// AtomicSDNode - A SDNode reprenting atomic operations. 1627/// 1628class AtomicSDNode : public MemSDNode { 1629 SDUse Ops[4]; 1630 1631public: 1632 // Opc: opcode for atomic 1633 // VTL: value type list 1634 // Chain: memory chain for operaand 1635 // Ptr: address to update as a SDValue 1636 // Cmp: compare value 1637 // Swp: swap value 1638 // SrcVal: address to update as a Value (used for MemOperand) 1639 // Align: alignment of memory 1640 AtomicSDNode(unsigned Opc, DebugLoc dl, SDVTList VTL, MVT MemVT, 1641 SDValue Chain, SDValue Ptr, 1642 SDValue Cmp, SDValue Swp, const Value* SrcVal, 1643 unsigned Align=0) 1644 : MemSDNode(Opc, dl, VTL, MemVT, SrcVal, /*SVOffset=*/0, 1645 Align, /*isVolatile=*/true) { 1646 InitOperands(Ops, Chain, Ptr, Cmp, Swp); 1647 } 1648 AtomicSDNode(unsigned Opc, DebugLoc dl, SDVTList VTL, MVT MemVT, 1649 SDValue Chain, SDValue Ptr, 1650 SDValue Val, const Value* SrcVal, unsigned Align=0) 1651 : MemSDNode(Opc, dl, VTL, MemVT, SrcVal, /*SVOffset=*/0, 1652 Align, /*isVolatile=*/true) { 1653 InitOperands(Ops, Chain, Ptr, Val); 1654 } 1655 1656 const SDValue &getBasePtr() const { return getOperand(1); } 1657 const SDValue &getVal() const { return getOperand(2); } 1658 1659 bool isCompareAndSwap() const { 1660 unsigned Op = getOpcode(); 1661 return Op == ISD::ATOMIC_CMP_SWAP; 1662 } 1663 1664 // Methods to support isa and dyn_cast 1665 static bool classof(const AtomicSDNode *) { return true; } 1666 static bool classof(const SDNode *N) { 1667 return N->getOpcode() == ISD::ATOMIC_CMP_SWAP || 1668 N->getOpcode() == ISD::ATOMIC_SWAP || 1669 N->getOpcode() == ISD::ATOMIC_LOAD_ADD || 1670 N->getOpcode() == ISD::ATOMIC_LOAD_SUB || 1671 N->getOpcode() == ISD::ATOMIC_LOAD_AND || 1672 N->getOpcode() == ISD::ATOMIC_LOAD_OR || 1673 N->getOpcode() == ISD::ATOMIC_LOAD_XOR || 1674 N->getOpcode() == ISD::ATOMIC_LOAD_NAND || 1675 N->getOpcode() == ISD::ATOMIC_LOAD_MIN || 1676 N->getOpcode() == ISD::ATOMIC_LOAD_MAX || 1677 N->getOpcode() == ISD::ATOMIC_LOAD_UMIN || 1678 N->getOpcode() == ISD::ATOMIC_LOAD_UMAX; 1679 } 1680}; 1681 1682/// MemIntrinsicSDNode - This SDNode is used for target intrinsic that touches 1683/// memory and need an associated memory operand. 1684/// 1685class MemIntrinsicSDNode : public MemSDNode { 1686 bool ReadMem; // Intrinsic reads memory 1687 bool WriteMem; // Intrinsic writes memory 1688public: 1689 MemIntrinsicSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, 1690 const SDValue *Ops, unsigned NumOps, 1691 MVT MemoryVT, const Value *srcValue, int SVO, 1692 unsigned Align, bool Vol, bool ReadMem, bool WriteMem) 1693 : MemSDNode(Opc, dl, VTs, Ops, NumOps, MemoryVT, srcValue, SVO, Align, Vol), 1694 ReadMem(ReadMem), WriteMem(WriteMem) { 1695 } 1696 1697 bool readMem() const { return ReadMem; } 1698 bool writeMem() const { return WriteMem; } 1699 1700 // Methods to support isa and dyn_cast 1701 static bool classof(const MemIntrinsicSDNode *) { return true; } 1702 static bool classof(const SDNode *N) { 1703 // We lower some target intrinsics to their target opcode 1704 // early a node with a target opcode can be of this class 1705 return N->getOpcode() == ISD::INTRINSIC_W_CHAIN || 1706 N->getOpcode() == ISD::INTRINSIC_VOID || 1707 N->isTargetOpcode(); 1708 } 1709}; 1710 1711class ConstantSDNode : public SDNode { 1712 const ConstantInt *Value; 1713protected: 1714 friend class SelectionDAG; 1715 ConstantSDNode(bool isTarget, const ConstantInt *val, MVT VT) 1716 : SDNode(isTarget ? ISD::TargetConstant : ISD::Constant, 1717 DebugLoc::getUnknownLoc(), getSDVTList(VT)), Value(val) { 1718 } 1719public: 1720 1721 const ConstantInt *getConstantIntValue() const { return Value; } 1722 const APInt &getAPIntValue() const { return Value->getValue(); } 1723 uint64_t getZExtValue() const { return Value->getZExtValue(); } 1724 int64_t getSExtValue() const { return Value->getSExtValue(); } 1725 1726 bool isNullValue() const { return Value->isNullValue(); } 1727 bool isAllOnesValue() const { return Value->isAllOnesValue(); } 1728 1729 static bool classof(const ConstantSDNode *) { return true; } 1730 static bool classof(const SDNode *N) { 1731 return N->getOpcode() == ISD::Constant || 1732 N->getOpcode() == ISD::TargetConstant; 1733 } 1734}; 1735 1736class ConstantFPSDNode : public SDNode { 1737 const ConstantFP *Value; 1738protected: 1739 friend class SelectionDAG; 1740 ConstantFPSDNode(bool isTarget, const ConstantFP *val, MVT VT) 1741 : SDNode(isTarget ? ISD::TargetConstantFP : ISD::ConstantFP, 1742 DebugLoc::getUnknownLoc(), getSDVTList(VT)), Value(val) { 1743 } 1744public: 1745 1746 const APFloat& getValueAPF() const { return Value->getValueAPF(); } 1747 const ConstantFP *getConstantFPValue() const { return Value; } 1748 1749 /// isExactlyValue - We don't rely on operator== working on double values, as 1750 /// it returns true for things that are clearly not equal, like -0.0 and 0.0. 1751 /// As such, this method can be used to do an exact bit-for-bit comparison of 1752 /// two floating point values. 1753 1754 /// We leave the version with the double argument here because it's just so 1755 /// convenient to write "2.0" and the like. Without this function we'd 1756 /// have to duplicate its logic everywhere it's called. 1757 bool isExactlyValue(double V) const { 1758 bool ignored; 1759 // convert is not supported on this type 1760 if (&Value->getValueAPF().getSemantics() == &APFloat::PPCDoubleDouble) 1761 return false; 1762 APFloat Tmp(V); 1763 Tmp.convert(Value->getValueAPF().getSemantics(), 1764 APFloat::rmNearestTiesToEven, &ignored); 1765 return isExactlyValue(Tmp); 1766 } 1767 bool isExactlyValue(const APFloat& V) const; 1768 1769 bool isValueValidForType(MVT VT, const APFloat& Val); 1770 1771 static bool classof(const ConstantFPSDNode *) { return true; } 1772 static bool classof(const SDNode *N) { 1773 return N->getOpcode() == ISD::ConstantFP || 1774 N->getOpcode() == ISD::TargetConstantFP; 1775 } 1776}; 1777 1778class GlobalAddressSDNode : public SDNode { 1779 GlobalValue *TheGlobal; 1780 int64_t Offset; 1781protected: 1782 friend class SelectionDAG; 1783 GlobalAddressSDNode(bool isTarget, const GlobalValue *GA, MVT VT, 1784 int64_t o = 0); 1785public: 1786 1787 GlobalValue *getGlobal() const { return TheGlobal; } 1788 int64_t getOffset() const { return Offset; } 1789 1790 static bool classof(const GlobalAddressSDNode *) { return true; } 1791 static bool classof(const SDNode *N) { 1792 return N->getOpcode() == ISD::GlobalAddress || 1793 N->getOpcode() == ISD::TargetGlobalAddress || 1794 N->getOpcode() == ISD::GlobalTLSAddress || 1795 N->getOpcode() == ISD::TargetGlobalTLSAddress; 1796 } 1797}; 1798 1799class FrameIndexSDNode : public SDNode { 1800 int FI; 1801protected: 1802 friend class SelectionDAG; 1803 FrameIndexSDNode(int fi, MVT VT, bool isTarg) 1804 : SDNode(isTarg ? ISD::TargetFrameIndex : ISD::FrameIndex, 1805 DebugLoc::getUnknownLoc(), getSDVTList(VT)), FI(fi) { 1806 } 1807public: 1808 1809 int getIndex() const { return FI; } 1810 1811 static bool classof(const FrameIndexSDNode *) { return true; } 1812 static bool classof(const SDNode *N) { 1813 return N->getOpcode() == ISD::FrameIndex || 1814 N->getOpcode() == ISD::TargetFrameIndex; 1815 } 1816}; 1817 1818class JumpTableSDNode : public SDNode { 1819 int JTI; 1820protected: 1821 friend class SelectionDAG; 1822 JumpTableSDNode(int jti, MVT VT, bool isTarg) 1823 : SDNode(isTarg ? ISD::TargetJumpTable : ISD::JumpTable, 1824 DebugLoc::getUnknownLoc(), getSDVTList(VT)), JTI(jti) { 1825 } 1826public: 1827 1828 int getIndex() const { return JTI; } 1829 1830 static bool classof(const JumpTableSDNode *) { return true; } 1831 static bool classof(const SDNode *N) { 1832 return N->getOpcode() == ISD::JumpTable || 1833 N->getOpcode() == ISD::TargetJumpTable; 1834 } 1835}; 1836 1837class ConstantPoolSDNode : public SDNode { 1838 union { 1839 Constant *ConstVal; 1840 MachineConstantPoolValue *MachineCPVal; 1841 } Val; 1842 int Offset; // It's a MachineConstantPoolValue if top bit is set. 1843 unsigned Alignment; 1844protected: 1845 friend class SelectionDAG; 1846 ConstantPoolSDNode(bool isTarget, Constant *c, MVT VT, int o=0) 1847 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 1848 DebugLoc::getUnknownLoc(), 1849 getSDVTList(VT)), Offset(o), Alignment(0) { 1850 assert((int)Offset >= 0 && "Offset is too large"); 1851 Val.ConstVal = c; 1852 } 1853 ConstantPoolSDNode(bool isTarget, Constant *c, MVT VT, int o, unsigned Align) 1854 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 1855 DebugLoc::getUnknownLoc(), 1856 getSDVTList(VT)), Offset(o), Alignment(Align) { 1857 assert((int)Offset >= 0 && "Offset is too large"); 1858 Val.ConstVal = c; 1859 } 1860 ConstantPoolSDNode(bool isTarget, MachineConstantPoolValue *v, 1861 MVT VT, int o=0) 1862 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 1863 DebugLoc::getUnknownLoc(), 1864 getSDVTList(VT)), Offset(o), Alignment(0) { 1865 assert((int)Offset >= 0 && "Offset is too large"); 1866 Val.MachineCPVal = v; 1867 Offset |= 1 << (sizeof(unsigned)*8-1); 1868 } 1869 ConstantPoolSDNode(bool isTarget, MachineConstantPoolValue *v, 1870 MVT VT, int o, unsigned Align) 1871 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 1872 DebugLoc::getUnknownLoc(), 1873 getSDVTList(VT)), Offset(o), Alignment(Align) { 1874 assert((int)Offset >= 0 && "Offset is too large"); 1875 Val.MachineCPVal = v; 1876 Offset |= 1 << (sizeof(unsigned)*8-1); 1877 } 1878public: 1879 1880 bool isMachineConstantPoolEntry() const { 1881 return (int)Offset < 0; 1882 } 1883 1884 Constant *getConstVal() const { 1885 assert(!isMachineConstantPoolEntry() && "Wrong constantpool type"); 1886 return Val.ConstVal; 1887 } 1888 1889 MachineConstantPoolValue *getMachineCPVal() const { 1890 assert(isMachineConstantPoolEntry() && "Wrong constantpool type"); 1891 return Val.MachineCPVal; 1892 } 1893 1894 int getOffset() const { 1895 return Offset & ~(1 << (sizeof(unsigned)*8-1)); 1896 } 1897 1898 // Return the alignment of this constant pool object, which is either 0 (for 1899 // default alignment) or log2 of the desired value. 1900 unsigned getAlignment() const { return Alignment; } 1901 1902 const Type *getType() const; 1903 1904 static bool classof(const ConstantPoolSDNode *) { return true; } 1905 static bool classof(const SDNode *N) { 1906 return N->getOpcode() == ISD::ConstantPool || 1907 N->getOpcode() == ISD::TargetConstantPool; 1908 } 1909}; 1910 1911class BasicBlockSDNode : public SDNode { 1912 MachineBasicBlock *MBB; 1913protected: 1914 friend class SelectionDAG; 1915 /// Debug info is meaningful and potentially useful here, but we create 1916 /// blocks out of order when they're jumped to, which makes it a bit 1917 /// harder. Let's see if we need it first. 1918 explicit BasicBlockSDNode(MachineBasicBlock *mbb) 1919 : SDNode(ISD::BasicBlock, DebugLoc::getUnknownLoc(), 1920 getSDVTList(MVT::Other)), MBB(mbb) { 1921 } 1922public: 1923 1924 MachineBasicBlock *getBasicBlock() const { return MBB; } 1925 1926 static bool classof(const BasicBlockSDNode *) { return true; } 1927 static bool classof(const SDNode *N) { 1928 return N->getOpcode() == ISD::BasicBlock; 1929 } 1930}; 1931 1932/// BuildVectorSDNode - A "pseudo-class" with methods for operating on 1933/// BUILD_VECTORs. 1934class BuildVectorSDNode : public SDNode { 1935public: 1936 /// isConstantSplat - check if this is a constant splat, and if so, return 1937 /// the splat element value in SplatBits. Any undefined bits in that value 1938 /// are set to zero, and the corresponding bits in the SplatUndef mask are 1939 /// set. The SplatSize value is set to the splat element size in bytes. 1940 /// HasAnyUndefs is set to true if any bits in the vector are undefined. 1941 bool isConstantSplat(unsigned &SplatBits, unsigned &SplatUndef, 1942 unsigned &SplatSize, bool &HasAnyUndefs); 1943 1944 static inline bool classof(const BuildVectorSDNode *) { return true; } 1945 static inline bool classof(const SDNode *N) { 1946 return N->getOpcode() == ISD::BUILD_VECTOR; 1947 } 1948}; 1949 1950/// SrcValueSDNode - An SDNode that holds an arbitrary LLVM IR Value. This is 1951/// used when the SelectionDAG needs to make a simple reference to something 1952/// in the LLVM IR representation. 1953/// 1954/// Note that this is not used for carrying alias information; that is done 1955/// with MemOperandSDNode, which includes a Value which is required to be a 1956/// pointer, and several other fields specific to memory references. 1957/// 1958class SrcValueSDNode : public SDNode { 1959 const Value *V; 1960protected: 1961 friend class SelectionDAG; 1962 /// Create a SrcValue for a general value. 1963 explicit SrcValueSDNode(const Value *v) 1964 : SDNode(ISD::SRCVALUE, DebugLoc::getUnknownLoc(), 1965 getSDVTList(MVT::Other)), V(v) {} 1966 1967public: 1968 /// getValue - return the contained Value. 1969 const Value *getValue() const { return V; } 1970 1971 static bool classof(const SrcValueSDNode *) { return true; } 1972 static bool classof(const SDNode *N) { 1973 return N->getOpcode() == ISD::SRCVALUE; 1974 } 1975}; 1976 1977 1978/// MemOperandSDNode - An SDNode that holds a MachineMemOperand. This is 1979/// used to represent a reference to memory after ISD::LOAD 1980/// and ISD::STORE have been lowered. 1981/// 1982class MemOperandSDNode : public SDNode { 1983protected: 1984 friend class SelectionDAG; 1985 /// Create a MachineMemOperand node 1986 explicit MemOperandSDNode(const MachineMemOperand &mo) 1987 : SDNode(ISD::MEMOPERAND, DebugLoc::getUnknownLoc(), 1988 getSDVTList(MVT::Other)), MO(mo) {} 1989 1990public: 1991 /// MO - The contained MachineMemOperand. 1992 const MachineMemOperand MO; 1993 1994 static bool classof(const MemOperandSDNode *) { return true; } 1995 static bool classof(const SDNode *N) { 1996 return N->getOpcode() == ISD::MEMOPERAND; 1997 } 1998}; 1999 2000 2001class RegisterSDNode : public SDNode { 2002 unsigned Reg; 2003protected: 2004 friend class SelectionDAG; 2005 RegisterSDNode(unsigned reg, MVT VT) 2006 : SDNode(ISD::Register, DebugLoc::getUnknownLoc(), 2007 getSDVTList(VT)), Reg(reg) { 2008 } 2009public: 2010 2011 unsigned getReg() const { return Reg; } 2012 2013 static bool classof(const RegisterSDNode *) { return true; } 2014 static bool classof(const SDNode *N) { 2015 return N->getOpcode() == ISD::Register; 2016 } 2017}; 2018 2019class DbgStopPointSDNode : public SDNode { 2020 SDUse Chain; 2021 unsigned Line; 2022 unsigned Column; 2023 Value *CU; 2024protected: 2025 friend class SelectionDAG; 2026 DbgStopPointSDNode(SDValue ch, unsigned l, unsigned c, 2027 Value *cu) 2028 : SDNode(ISD::DBG_STOPPOINT, DebugLoc::getUnknownLoc(), 2029 getSDVTList(MVT::Other)), Line(l), Column(c), CU(cu) { 2030 InitOperands(&Chain, ch); 2031 } 2032public: 2033 unsigned getLine() const { return Line; } 2034 unsigned getColumn() const { return Column; } 2035 Value *getCompileUnit() const { return CU; } 2036 2037 static bool classof(const DbgStopPointSDNode *) { return true; } 2038 static bool classof(const SDNode *N) { 2039 return N->getOpcode() == ISD::DBG_STOPPOINT; 2040 } 2041}; 2042 2043class LabelSDNode : public SDNode { 2044 SDUse Chain; 2045 unsigned LabelID; 2046protected: 2047 friend class SelectionDAG; 2048LabelSDNode(unsigned NodeTy, DebugLoc dl, SDValue ch, unsigned id) 2049 : SDNode(NodeTy, dl, getSDVTList(MVT::Other)), LabelID(id) { 2050 InitOperands(&Chain, ch); 2051 } 2052public: 2053 unsigned getLabelID() const { return LabelID; } 2054 2055 static bool classof(const LabelSDNode *) { return true; } 2056 static bool classof(const SDNode *N) { 2057 return N->getOpcode() == ISD::DBG_LABEL || 2058 N->getOpcode() == ISD::EH_LABEL; 2059 } 2060}; 2061 2062class ExternalSymbolSDNode : public SDNode { 2063 const char *Symbol; 2064protected: 2065 friend class SelectionDAG; 2066 ExternalSymbolSDNode(bool isTarget, const char *Sym, MVT VT) 2067 : SDNode(isTarget ? ISD::TargetExternalSymbol : ISD::ExternalSymbol, 2068 DebugLoc::getUnknownLoc(), 2069 getSDVTList(VT)), Symbol(Sym) { 2070 } 2071public: 2072 2073 const char *getSymbol() const { return Symbol; } 2074 2075 static bool classof(const ExternalSymbolSDNode *) { return true; } 2076 static bool classof(const SDNode *N) { 2077 return N->getOpcode() == ISD::ExternalSymbol || 2078 N->getOpcode() == ISD::TargetExternalSymbol; 2079 } 2080}; 2081 2082class CondCodeSDNode : public SDNode { 2083 ISD::CondCode Condition; 2084protected: 2085 friend class SelectionDAG; 2086 explicit CondCodeSDNode(ISD::CondCode Cond) 2087 : SDNode(ISD::CONDCODE, DebugLoc::getUnknownLoc(), 2088 getSDVTList(MVT::Other)), Condition(Cond) { 2089 } 2090public: 2091 2092 ISD::CondCode get() const { return Condition; } 2093 2094 static bool classof(const CondCodeSDNode *) { return true; } 2095 static bool classof(const SDNode *N) { 2096 return N->getOpcode() == ISD::CONDCODE; 2097 } 2098}; 2099 2100/// CvtRndSatSDNode - NOTE: avoid using this node as this may disappear in the 2101/// future and most targets don't support it. 2102class CvtRndSatSDNode : public SDNode { 2103 ISD::CvtCode CvtCode; 2104protected: 2105 friend class SelectionDAG; 2106 explicit CvtRndSatSDNode(MVT VT, DebugLoc dl, const SDValue *Ops, 2107 unsigned NumOps, ISD::CvtCode Code) 2108 : SDNode(ISD::CONVERT_RNDSAT, dl, getSDVTList(VT), Ops, NumOps), 2109 CvtCode(Code) { 2110 assert(NumOps == 5 && "wrong number of operations"); 2111 } 2112public: 2113 ISD::CvtCode getCvtCode() const { return CvtCode; } 2114 2115 static bool classof(const CvtRndSatSDNode *) { return true; } 2116 static bool classof(const SDNode *N) { 2117 return N->getOpcode() == ISD::CONVERT_RNDSAT; 2118 } 2119}; 2120 2121namespace ISD { 2122 struct ArgFlagsTy { 2123 private: 2124 static const uint64_t NoFlagSet = 0ULL; 2125 static const uint64_t ZExt = 1ULL<<0; ///< Zero extended 2126 static const uint64_t ZExtOffs = 0; 2127 static const uint64_t SExt = 1ULL<<1; ///< Sign extended 2128 static const uint64_t SExtOffs = 1; 2129 static const uint64_t InReg = 1ULL<<2; ///< Passed in register 2130 static const uint64_t InRegOffs = 2; 2131 static const uint64_t SRet = 1ULL<<3; ///< Hidden struct-ret ptr 2132 static const uint64_t SRetOffs = 3; 2133 static const uint64_t ByVal = 1ULL<<4; ///< Struct passed by value 2134 static const uint64_t ByValOffs = 4; 2135 static const uint64_t Nest = 1ULL<<5; ///< Nested fn static chain 2136 static const uint64_t NestOffs = 5; 2137 static const uint64_t ByValAlign = 0xFULL << 6; //< Struct alignment 2138 static const uint64_t ByValAlignOffs = 6; 2139 static const uint64_t Split = 1ULL << 10; 2140 static const uint64_t SplitOffs = 10; 2141 static const uint64_t OrigAlign = 0x1FULL<<27; 2142 static const uint64_t OrigAlignOffs = 27; 2143 static const uint64_t ByValSize = 0xffffffffULL << 32; //< Struct size 2144 static const uint64_t ByValSizeOffs = 32; 2145 2146 static const uint64_t One = 1ULL; //< 1 of this type, for shifts 2147 2148 uint64_t Flags; 2149 public: 2150 ArgFlagsTy() : Flags(0) { } 2151 2152 bool isZExt() const { return Flags & ZExt; } 2153 void setZExt() { Flags |= One << ZExtOffs; } 2154 2155 bool isSExt() const { return Flags & SExt; } 2156 void setSExt() { Flags |= One << SExtOffs; } 2157 2158 bool isInReg() const { return Flags & InReg; } 2159 void setInReg() { Flags |= One << InRegOffs; } 2160 2161 bool isSRet() const { return Flags & SRet; } 2162 void setSRet() { Flags |= One << SRetOffs; } 2163 2164 bool isByVal() const { return Flags & ByVal; } 2165 void setByVal() { Flags |= One << ByValOffs; } 2166 2167 bool isNest() const { return Flags & Nest; } 2168 void setNest() { Flags |= One << NestOffs; } 2169 2170 unsigned getByValAlign() const { 2171 return (unsigned) 2172 ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2); 2173 } 2174 void setByValAlign(unsigned A) { 2175 Flags = (Flags & ~ByValAlign) | 2176 (uint64_t(Log2_32(A) + 1) << ByValAlignOffs); 2177 } 2178 2179 bool isSplit() const { return Flags & Split; } 2180 void setSplit() { Flags |= One << SplitOffs; } 2181 2182 unsigned getOrigAlign() const { 2183 return (unsigned) 2184 ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2); 2185 } 2186 void setOrigAlign(unsigned A) { 2187 Flags = (Flags & ~OrigAlign) | 2188 (uint64_t(Log2_32(A) + 1) << OrigAlignOffs); 2189 } 2190 2191 unsigned getByValSize() const { 2192 return (unsigned)((Flags & ByValSize) >> ByValSizeOffs); 2193 } 2194 void setByValSize(unsigned S) { 2195 Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs); 2196 } 2197 2198 /// getArgFlagsString - Returns the flags as a string, eg: "zext align:4". 2199 std::string getArgFlagsString(); 2200 2201 /// getRawBits - Represent the flags as a bunch of bits. 2202 uint64_t getRawBits() const { return Flags; } 2203 }; 2204} 2205 2206/// ARG_FLAGSSDNode - Leaf node holding parameter flags. 2207class ARG_FLAGSSDNode : public SDNode { 2208 ISD::ArgFlagsTy TheFlags; 2209protected: 2210 friend class SelectionDAG; 2211 explicit ARG_FLAGSSDNode(ISD::ArgFlagsTy Flags) 2212 : SDNode(ISD::ARG_FLAGS, DebugLoc::getUnknownLoc(), 2213 getSDVTList(MVT::Other)), TheFlags(Flags) { 2214 } 2215public: 2216 ISD::ArgFlagsTy getArgFlags() const { return TheFlags; } 2217 2218 static bool classof(const ARG_FLAGSSDNode *) { return true; } 2219 static bool classof(const SDNode *N) { 2220 return N->getOpcode() == ISD::ARG_FLAGS; 2221 } 2222}; 2223 2224/// CallSDNode - Node for calls -- ISD::CALL. 2225class CallSDNode : public SDNode { 2226 unsigned CallingConv; 2227 bool IsVarArg; 2228 bool IsTailCall; 2229 // We might eventually want a full-blown Attributes for the result; that 2230 // will expand the size of the representation. At the moment we only 2231 // need Inreg. 2232 bool Inreg; 2233protected: 2234 friend class SelectionDAG; 2235 CallSDNode(unsigned cc, DebugLoc dl, bool isvararg, bool istailcall, 2236 bool isinreg, SDVTList VTs, const SDValue *Operands, 2237 unsigned numOperands) 2238 : SDNode(ISD::CALL, dl, VTs, Operands, numOperands), 2239 CallingConv(cc), IsVarArg(isvararg), IsTailCall(istailcall), 2240 Inreg(isinreg) {} 2241public: 2242 unsigned getCallingConv() const { return CallingConv; } 2243 unsigned isVarArg() const { return IsVarArg; } 2244 unsigned isTailCall() const { return IsTailCall; } 2245 unsigned isInreg() const { return Inreg; } 2246 2247 /// Set this call to not be marked as a tail call. Normally setter 2248 /// methods in SDNodes are unsafe because it breaks the CSE map, 2249 /// but we don't include the tail call flag for calls so it's ok 2250 /// in this case. 2251 void setNotTailCall() { IsTailCall = false; } 2252 2253 SDValue getChain() const { return getOperand(0); } 2254 SDValue getCallee() const { return getOperand(1); } 2255 2256 unsigned getNumArgs() const { return (getNumOperands() - 2) / 2; } 2257 SDValue getArg(unsigned i) const { return getOperand(2+2*i); } 2258 SDValue getArgFlagsVal(unsigned i) const { 2259 return getOperand(3+2*i); 2260 } 2261 ISD::ArgFlagsTy getArgFlags(unsigned i) const { 2262 return cast<ARG_FLAGSSDNode>(getArgFlagsVal(i).getNode())->getArgFlags(); 2263 } 2264 2265 unsigned getNumRetVals() const { return getNumValues() - 1; } 2266 MVT getRetValType(unsigned i) const { return getValueType(i); } 2267 2268 static bool classof(const CallSDNode *) { return true; } 2269 static bool classof(const SDNode *N) { 2270 return N->getOpcode() == ISD::CALL; 2271 } 2272}; 2273 2274/// VTSDNode - This class is used to represent MVT's, which are used 2275/// to parameterize some operations. 2276class VTSDNode : public SDNode { 2277 MVT ValueType; 2278protected: 2279 friend class SelectionDAG; 2280 explicit VTSDNode(MVT VT) 2281 : SDNode(ISD::VALUETYPE, DebugLoc::getUnknownLoc(), 2282 getSDVTList(MVT::Other)), ValueType(VT) { 2283 } 2284public: 2285 2286 MVT getVT() const { return ValueType; } 2287 2288 static bool classof(const VTSDNode *) { return true; } 2289 static bool classof(const SDNode *N) { 2290 return N->getOpcode() == ISD::VALUETYPE; 2291 } 2292}; 2293 2294/// LSBaseSDNode - Base class for LoadSDNode and StoreSDNode 2295/// 2296class LSBaseSDNode : public MemSDNode { 2297protected: 2298 //! Operand array for load and store 2299 /*! 2300 \note Moving this array to the base class captures more 2301 common functionality shared between LoadSDNode and 2302 StoreSDNode 2303 */ 2304 SDUse Ops[4]; 2305public: 2306 LSBaseSDNode(ISD::NodeType NodeTy, DebugLoc dl, SDValue *Operands, 2307 unsigned numOperands, SDVTList VTs, ISD::MemIndexedMode AM, 2308 MVT VT, const Value *SV, int SVO, unsigned Align, bool Vol) 2309 : MemSDNode(NodeTy, dl, VTs, VT, SV, SVO, Align, Vol) { 2310 assert(Align != 0 && "Loads and stores should have non-zero aligment"); 2311 SubclassData |= AM << 2; 2312 assert(getAddressingMode() == AM && "MemIndexedMode encoding error!"); 2313 InitOperands(Ops, Operands, numOperands); 2314 assert((getOffset().getOpcode() == ISD::UNDEF || isIndexed()) && 2315 "Only indexed loads and stores have a non-undef offset operand"); 2316 } 2317 2318 const SDValue &getOffset() const { 2319 return getOperand(getOpcode() == ISD::LOAD ? 2 : 3); 2320 } 2321 2322 /// getAddressingMode - Return the addressing mode for this load or store: 2323 /// unindexed, pre-inc, pre-dec, post-inc, or post-dec. 2324 ISD::MemIndexedMode getAddressingMode() const { 2325 return ISD::MemIndexedMode((SubclassData >> 2) & 7); 2326 } 2327 2328 /// isIndexed - Return true if this is a pre/post inc/dec load/store. 2329 bool isIndexed() const { return getAddressingMode() != ISD::UNINDEXED; } 2330 2331 /// isUnindexed - Return true if this is NOT a pre/post inc/dec load/store. 2332 bool isUnindexed() const { return getAddressingMode() == ISD::UNINDEXED; } 2333 2334 static bool classof(const LSBaseSDNode *) { return true; } 2335 static bool classof(const SDNode *N) { 2336 return N->getOpcode() == ISD::LOAD || 2337 N->getOpcode() == ISD::STORE; 2338 } 2339}; 2340 2341/// LoadSDNode - This class is used to represent ISD::LOAD nodes. 2342/// 2343class LoadSDNode : public LSBaseSDNode { 2344protected: 2345 friend class SelectionDAG; 2346 LoadSDNode(SDValue *ChainPtrOff, DebugLoc dl, SDVTList VTs, 2347 ISD::MemIndexedMode AM, ISD::LoadExtType ETy, MVT LVT, 2348 const Value *SV, int O=0, unsigned Align=0, bool Vol=false) 2349 : LSBaseSDNode(ISD::LOAD, dl, ChainPtrOff, 3, 2350 VTs, AM, LVT, SV, O, Align, Vol) { 2351 SubclassData |= (unsigned short)ETy; 2352 assert(getExtensionType() == ETy && "LoadExtType encoding error!"); 2353 } 2354public: 2355 2356 /// getExtensionType - Return whether this is a plain node, 2357 /// or one of the varieties of value-extending loads. 2358 ISD::LoadExtType getExtensionType() const { 2359 return ISD::LoadExtType(SubclassData & 3); 2360 } 2361 2362 const SDValue &getBasePtr() const { return getOperand(1); } 2363 const SDValue &getOffset() const { return getOperand(2); } 2364 2365 static bool classof(const LoadSDNode *) { return true; } 2366 static bool classof(const SDNode *N) { 2367 return N->getOpcode() == ISD::LOAD; 2368 } 2369}; 2370 2371/// StoreSDNode - This class is used to represent ISD::STORE nodes. 2372/// 2373class StoreSDNode : public LSBaseSDNode { 2374protected: 2375 friend class SelectionDAG; 2376 StoreSDNode(SDValue *ChainValuePtrOff, DebugLoc dl, SDVTList VTs, 2377 ISD::MemIndexedMode AM, bool isTrunc, MVT SVT, 2378 const Value *SV, int O=0, unsigned Align=0, bool Vol=false) 2379 : LSBaseSDNode(ISD::STORE, dl, ChainValuePtrOff, 4, 2380 VTs, AM, SVT, SV, O, Align, Vol) { 2381 SubclassData |= (unsigned short)isTrunc; 2382 assert(isTruncatingStore() == isTrunc && "isTrunc encoding error!"); 2383 } 2384public: 2385 2386 /// isTruncatingStore - Return true if the op does a truncation before store. 2387 /// For integers this is the same as doing a TRUNCATE and storing the result. 2388 /// For floats, it is the same as doing an FP_ROUND and storing the result. 2389 bool isTruncatingStore() const { return SubclassData & 1; } 2390 2391 const SDValue &getValue() const { return getOperand(1); } 2392 const SDValue &getBasePtr() const { return getOperand(2); } 2393 const SDValue &getOffset() const { return getOperand(3); } 2394 2395 static bool classof(const StoreSDNode *) { return true; } 2396 static bool classof(const SDNode *N) { 2397 return N->getOpcode() == ISD::STORE; 2398 } 2399}; 2400 2401 2402class SDNodeIterator : public forward_iterator<SDNode, ptrdiff_t> { 2403 SDNode *Node; 2404 unsigned Operand; 2405 2406 SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {} 2407public: 2408 bool operator==(const SDNodeIterator& x) const { 2409 return Operand == x.Operand; 2410 } 2411 bool operator!=(const SDNodeIterator& x) const { return !operator==(x); } 2412 2413 const SDNodeIterator &operator=(const SDNodeIterator &I) { 2414 assert(I.Node == Node && "Cannot assign iterators to two different nodes!"); 2415 Operand = I.Operand; 2416 return *this; 2417 } 2418 2419 pointer operator*() const { 2420 return Node->getOperand(Operand).getNode(); 2421 } 2422 pointer operator->() const { return operator*(); } 2423 2424 SDNodeIterator& operator++() { // Preincrement 2425 ++Operand; 2426 return *this; 2427 } 2428 SDNodeIterator operator++(int) { // Postincrement 2429 SDNodeIterator tmp = *this; ++*this; return tmp; 2430 } 2431 2432 static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); } 2433 static SDNodeIterator end (SDNode *N) { 2434 return SDNodeIterator(N, N->getNumOperands()); 2435 } 2436 2437 unsigned getOperand() const { return Operand; } 2438 const SDNode *getNode() const { return Node; } 2439}; 2440 2441template <> struct GraphTraits<SDNode*> { 2442 typedef SDNode NodeType; 2443 typedef SDNodeIterator ChildIteratorType; 2444 static inline NodeType *getEntryNode(SDNode *N) { return N; } 2445 static inline ChildIteratorType child_begin(NodeType *N) { 2446 return SDNodeIterator::begin(N); 2447 } 2448 static inline ChildIteratorType child_end(NodeType *N) { 2449 return SDNodeIterator::end(N); 2450 } 2451}; 2452 2453/// LargestSDNode - The largest SDNode class. 2454/// 2455typedef LoadSDNode LargestSDNode; 2456 2457/// MostAlignedSDNode - The SDNode class with the greatest alignment 2458/// requirement. 2459/// 2460typedef ARG_FLAGSSDNode MostAlignedSDNode; 2461 2462namespace ISD { 2463 /// isNormalLoad - Returns true if the specified node is a non-extending 2464 /// and unindexed load. 2465 inline bool isNormalLoad(const SDNode *N) { 2466 const LoadSDNode *Ld = dyn_cast<LoadSDNode>(N); 2467 return Ld && Ld->getExtensionType() == ISD::NON_EXTLOAD && 2468 Ld->getAddressingMode() == ISD::UNINDEXED; 2469 } 2470 2471 /// isNON_EXTLoad - Returns true if the specified node is a non-extending 2472 /// load. 2473 inline bool isNON_EXTLoad(const SDNode *N) { 2474 return isa<LoadSDNode>(N) && 2475 cast<LoadSDNode>(N)->getExtensionType() == ISD::NON_EXTLOAD; 2476 } 2477 2478 /// isEXTLoad - Returns true if the specified node is a EXTLOAD. 2479 /// 2480 inline bool isEXTLoad(const SDNode *N) { 2481 return isa<LoadSDNode>(N) && 2482 cast<LoadSDNode>(N)->getExtensionType() == ISD::EXTLOAD; 2483 } 2484 2485 /// isSEXTLoad - Returns true if the specified node is a SEXTLOAD. 2486 /// 2487 inline bool isSEXTLoad(const SDNode *N) { 2488 return isa<LoadSDNode>(N) && 2489 cast<LoadSDNode>(N)->getExtensionType() == ISD::SEXTLOAD; 2490 } 2491 2492 /// isZEXTLoad - Returns true if the specified node is a ZEXTLOAD. 2493 /// 2494 inline bool isZEXTLoad(const SDNode *N) { 2495 return isa<LoadSDNode>(N) && 2496 cast<LoadSDNode>(N)->getExtensionType() == ISD::ZEXTLOAD; 2497 } 2498 2499 /// isUNINDEXEDLoad - Returns true if the specified node is an unindexed load. 2500 /// 2501 inline bool isUNINDEXEDLoad(const SDNode *N) { 2502 return isa<LoadSDNode>(N) && 2503 cast<LoadSDNode>(N)->getAddressingMode() == ISD::UNINDEXED; 2504 } 2505 2506 /// isNormalStore - Returns true if the specified node is a non-truncating 2507 /// and unindexed store. 2508 inline bool isNormalStore(const SDNode *N) { 2509 const StoreSDNode *St = dyn_cast<StoreSDNode>(N); 2510 return St && !St->isTruncatingStore() && 2511 St->getAddressingMode() == ISD::UNINDEXED; 2512 } 2513 2514 /// isNON_TRUNCStore - Returns true if the specified node is a non-truncating 2515 /// store. 2516 inline bool isNON_TRUNCStore(const SDNode *N) { 2517 return isa<StoreSDNode>(N) && !cast<StoreSDNode>(N)->isTruncatingStore(); 2518 } 2519 2520 /// isTRUNCStore - Returns true if the specified node is a truncating 2521 /// store. 2522 inline bool isTRUNCStore(const SDNode *N) { 2523 return isa<StoreSDNode>(N) && cast<StoreSDNode>(N)->isTruncatingStore(); 2524 } 2525 2526 /// isUNINDEXEDStore - Returns true if the specified node is an 2527 /// unindexed store. 2528 inline bool isUNINDEXEDStore(const SDNode *N) { 2529 return isa<StoreSDNode>(N) && 2530 cast<StoreSDNode>(N)->getAddressingMode() == ISD::UNINDEXED; 2531 } 2532} 2533 2534 2535} // end llvm namespace 2536 2537#endif 2538