1 //===-- llvm/CodeGen/ISDOpcodes.h - CodeGen opcodes -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares codegen opcodes and related utilities.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_ISDOPCODES_H
15 #define LLVM_CODEGEN_ISDOPCODES_H
19 /// ISD namespace - This namespace contains an enum which represents all of the
20 /// SelectionDAG node types and value types.
24 //===--------------------------------------------------------------------===//
25 /// ISD::NodeType enum - This enum defines the target-independent operators
26 /// for a SelectionDAG.
28 /// Targets may also define target-dependent operator codes for SDNodes. For
29 /// example, on x86, these are the enum values in the X86ISD namespace.
30 /// Targets should aim to use target-independent operators to model their
31 /// instruction sets as much as possible, and only use target-dependent
32 /// operators when they have special requirements.
34 /// Finally, during and after selection proper, SNodes may use special
35 /// operator codes that correspond directly with MachineInstr opcodes. These
36 /// are used to represent selected instructions. See the isMachineOpcode()
37 /// and getMachineOpcode() member functions of SDNode.
40 /// DELETED_NODE - This is an illegal value that is used to catch
41 /// errors. This opcode is not a legal opcode for any node.
44 /// EntryToken - This is the marker used to indicate the start of a region.
47 /// TokenFactor - This node takes multiple tokens as input and produces a
48 /// single token result. This is used to represent the fact that the operand
49 /// operators are independent of each other.
52 /// AssertSext, AssertZext - These nodes record if a register contains a
53 /// value that has already been zero or sign extended from a narrower type.
54 /// These nodes take two operands. The first is the node that has already
55 /// been extended, and the second is a value type node indicating the width
57 AssertSext, AssertZext,
59 /// Various leaf nodes.
60 BasicBlock, VALUETYPE, CONDCODE, Register, RegisterMask,
62 GlobalAddress, GlobalTLSAddress, FrameIndex,
63 JumpTable, ConstantPool, ExternalSymbol, BlockAddress,
65 /// The address of the GOT
68 /// FRAMEADDR, RETURNADDR - These nodes represent llvm.frameaddress and
69 /// llvm.returnaddress on the DAG. These nodes take one operand, the index
70 /// of the frame or return address to return. An index of zero corresponds
71 /// to the current function's frame or return address, an index of one to
72 /// the parent's frame or return address, and so on.
73 FRAMEADDR, RETURNADDR,
75 /// FRAME_TO_ARGS_OFFSET - This node represents offset from frame pointer to
76 /// first (possible) on-stack argument. This is needed for correct stack
77 /// adjustment during unwind.
80 /// OUTCHAIN = EH_RETURN(INCHAIN, OFFSET, HANDLER) - This node represents
81 /// 'eh_return' gcc dwarf builtin, which is used to return from
82 /// exception. The general meaning is: adjust stack by OFFSET and pass
83 /// execution to HANDLER. Many platform-related details also :)
86 /// RESULT, OUTCHAIN = EH_SJLJ_SETJMP(INCHAIN, buffer)
87 /// This corresponds to the eh.sjlj.setjmp intrinsic.
88 /// It takes an input chain and a pointer to the jump buffer as inputs
89 /// and returns an outchain.
92 /// OUTCHAIN = EH_SJLJ_LONGJMP(INCHAIN, buffer)
93 /// This corresponds to the eh.sjlj.longjmp intrinsic.
94 /// It takes an input chain and a pointer to the jump buffer as inputs
95 /// and returns an outchain.
98 /// TargetConstant* - Like Constant*, but the DAG does not do any folding,
99 /// simplification, or lowering of the constant. They are used for constants
100 /// which are known to fit in the immediate fields of their users, or for
101 /// carrying magic numbers which are not values which need to be
102 /// materialized in registers.
106 /// TargetGlobalAddress - Like GlobalAddress, but the DAG does no folding or
107 /// anything else with this node, and this is valid in the target-specific
108 /// dag, turning into a GlobalAddress operand.
110 TargetGlobalTLSAddress,
114 TargetExternalSymbol,
117 /// TargetIndex - Like a constant pool entry, but with completely
118 /// target-dependent semantics. Holds target flags, a 32-bit index, and a
119 /// 64-bit index. Targets can use this however they like.
122 /// RESULT = INTRINSIC_WO_CHAIN(INTRINSICID, arg1, arg2, ...)
123 /// This node represents a target intrinsic function with no side effects.
124 /// The first operand is the ID number of the intrinsic from the
125 /// llvm::Intrinsic namespace. The operands to the intrinsic follow. The
126 /// node returns the result of the intrinsic.
129 /// RESULT,OUTCHAIN = INTRINSIC_W_CHAIN(INCHAIN, INTRINSICID, arg1, ...)
130 /// This node represents a target intrinsic function with side effects that
131 /// returns a result. The first operand is a chain pointer. The second is
132 /// the ID number of the intrinsic from the llvm::Intrinsic namespace. The
133 /// operands to the intrinsic follow. The node has two results, the result
134 /// of the intrinsic and an output chain.
137 /// OUTCHAIN = INTRINSIC_VOID(INCHAIN, INTRINSICID, arg1, arg2, ...)
138 /// This node represents a target intrinsic function with side effects that
139 /// does not return a result. The first operand is a chain pointer. The
140 /// second is the ID number of the intrinsic from the llvm::Intrinsic
141 /// namespace. The operands to the intrinsic follow.
144 /// CopyToReg - This node has three operands: a chain, a register number to
145 /// set to this value, and a value.
148 /// CopyFromReg - This node indicates that the input value is a virtual or
149 /// physical register that is defined outside of the scope of this
150 /// SelectionDAG. The register is available from the RegisterSDNode object.
153 /// UNDEF - An undefined node.
156 /// EXTRACT_ELEMENT - This is used to get the lower or upper (determined by
157 /// a Constant, which is required to be operand #1) half of the integer or
158 /// float value specified as operand #0. This is only for use before
159 /// legalization, for values that will be broken into multiple registers.
162 /// BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways.
163 /// Given two values of the same integer value type, this produces a value
164 /// twice as big. Like EXTRACT_ELEMENT, this can only be used before
168 /// MERGE_VALUES - This node takes multiple discrete operands and returns
169 /// them all as its individual results. This nodes has exactly the same
170 /// number of inputs and outputs. This node is useful for some pieces of the
171 /// code generator that want to think about a single node with multiple
172 /// results, not multiple nodes.
175 /// Simple integer binary arithmetic operators.
176 ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
178 /// SMUL_LOHI/UMUL_LOHI - Multiply two integers of type iN, producing
179 /// a signed/unsigned value of type i[2*N], and return the full value as
180 /// two results, each of type iN.
181 SMUL_LOHI, UMUL_LOHI,
183 /// SDIVREM/UDIVREM - Divide two integers and produce both a quotient and
184 /// remainder result.
187 /// CARRY_FALSE - This node is used when folding other nodes,
188 /// like ADDC/SUBC, which indicate the carry result is always false.
191 /// Carry-setting nodes for multiple precision addition and subtraction.
192 /// These nodes take two operands of the same value type, and produce two
193 /// results. The first result is the normal add or sub result, the second
194 /// result is the carry flag result.
197 /// Carry-using nodes for multiple precision addition and subtraction. These
198 /// nodes take three operands: The first two are the normal lhs and rhs to
199 /// the add or sub, and the third is the input carry flag. These nodes
200 /// produce two results; the normal result of the add or sub, and the output
201 /// carry flag. These nodes both read and write a carry flag to allow them
202 /// to them to be chained together for add and sub of arbitrarily large
206 /// RESULT, BOOL = [SU]ADDO(LHS, RHS) - Overflow-aware nodes for addition.
207 /// These nodes take two operands: the normal LHS and RHS to the add. They
208 /// produce two results: the normal result of the add, and a boolean that
209 /// indicates if an overflow occurred (*not* a flag, because it may be store
210 /// to memory, etc.). If the type of the boolean is not i1 then the high
211 /// bits conform to getBooleanContents.
212 /// These nodes are generated from llvm.[su]add.with.overflow intrinsics.
215 /// Same for subtraction.
218 /// Same for multiplication.
221 /// Simple binary floating point operators.
222 FADD, FSUB, FMUL, FMA, FDIV, FREM,
224 /// FCOPYSIGN(X, Y) - Return the value of X with the sign of Y. NOTE: This
225 /// DAG node does not require that X and Y have the same type, just that the
226 /// are both floating point. X and the result must have the same type.
227 /// FCOPYSIGN(f32, f64) is allowed.
230 /// INT = FGETSIGN(FP) - Return the sign bit of the specified floating point
231 /// value as an integer 0/1 value.
234 /// BUILD_VECTOR(ELT0, ELT1, ELT2, ELT3,...) - Return a vector with the
235 /// specified, possibly variable, elements. The number of elements is
236 /// required to be a power of two. The types of the operands must all be
237 /// the same and must match the vector element type, except that integer
238 /// types are allowed to be larger than the element type, in which case
239 /// the operands are implicitly truncated.
242 /// INSERT_VECTOR_ELT(VECTOR, VAL, IDX) - Returns VECTOR with the element
243 /// at IDX replaced with VAL. If the type of VAL is larger than the vector
244 /// element type then VAL is truncated before replacement.
247 /// EXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR
248 /// identified by the (potentially variable) element number IDX. If the
249 /// return type is an integer type larger than the element type of the
250 /// vector, the result is extended to the width of the return type.
253 /// CONCAT_VECTORS(VECTOR0, VECTOR1, ...) - Given a number of values of
254 /// vector type with the same length and element type, this produces a
255 /// concatenated vector result value, with length equal to the sum of the
256 /// lengths of the input vectors.
259 /// INSERT_SUBVECTOR(VECTOR1, VECTOR2, IDX) - Returns a vector
260 /// with VECTOR2 inserted into VECTOR1 at the (potentially
261 /// variable) element number IDX, which must be a multiple of the
262 /// VECTOR2 vector length. The elements of VECTOR1 starting at
263 /// IDX are overwritten with VECTOR2. Elements IDX through
264 /// vector_length(VECTOR2) must be valid VECTOR1 indices.
267 /// EXTRACT_SUBVECTOR(VECTOR, IDX) - Returns a subvector from VECTOR (an
268 /// vector value) starting with the element number IDX, which must be a
269 /// constant multiple of the result vector length.
272 /// VECTOR_SHUFFLE(VEC1, VEC2) - Returns a vector, of the same type as
273 /// VEC1/VEC2. A VECTOR_SHUFFLE node also contains an array of constant int
274 /// values that indicate which value (or undef) each result element will
275 /// get. These constant ints are accessible through the
276 /// ShuffleVectorSDNode class. This is quite similar to the Altivec
277 /// 'vperm' instruction, except that the indices must be constants and are
278 /// in terms of the element size of VEC1/VEC2, not in terms of bytes.
281 /// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a
282 /// scalar value into element 0 of the resultant vector type. The top
283 /// elements 1 to N-1 of the N-element vector are undefined. The type
284 /// of the operand must match the vector element type, except when they
285 /// are integer types. In this case the operand is allowed to be wider
286 /// than the vector element type, and is implicitly truncated to it.
289 /// MULHU/MULHS - Multiply high - Multiply two integers of type iN,
290 /// producing an unsigned/signed value of type i[2*N], then return the top
294 /// Bitwise operators - logical and, logical or, logical xor.
297 /// Shift and rotation operations. After legalization, the type of the
298 /// shift amount is known to be TLI.getShiftAmountTy(). Before legalization
299 /// the shift amount can be any type, but care must be taken to ensure it is
300 /// large enough. TLI.getShiftAmountTy() is i8 on some targets, but before
301 /// legalization, types like i1024 can occur and i8 doesn't have enough bits
302 /// to represent the shift amount.
303 /// When the 1st operand is a vector, the shift amount must be in the same
304 /// type. (TLI.getShiftAmountTy() will return the same type when the input
305 /// type is a vector.)
306 SHL, SRA, SRL, ROTL, ROTR,
308 /// Byte Swap and Counting operators.
309 BSWAP, CTTZ, CTLZ, CTPOP,
311 /// Bit counting operators with an undefined result for zero inputs.
312 CTTZ_ZERO_UNDEF, CTLZ_ZERO_UNDEF,
314 /// Select(COND, TRUEVAL, FALSEVAL). If the type of the boolean COND is not
315 /// i1 then the high bits must conform to getBooleanContents.
318 /// Select with a vector condition (op #0) and two vector operands (ops #1
319 /// and #2), returning a vector result. All vectors have the same length.
320 /// Much like the scalar select and setcc, each bit in the condition selects
321 /// whether the corresponding result element is taken from op #1 or op #2.
322 /// At first, the VSELECT condition is of vXi1 type. Later, targets may
323 /// change the condition type in order to match the VSELECT node using a
324 /// pattern. The condition follows the BooleanContent format of the target.
327 /// Select with condition operator - This selects between a true value and
328 /// a false value (ops #2 and #3) based on the boolean result of comparing
329 /// the lhs and rhs (ops #0 and #1) of a conditional expression with the
330 /// condition code in op #4, a CondCodeSDNode.
333 /// SetCC operator - This evaluates to a true value iff the condition is
334 /// true. If the result value type is not i1 then the high bits conform
335 /// to getBooleanContents. The operands to this are the left and right
336 /// operands to compare (ops #0, and #1) and the condition code to compare
337 /// them with (op #2) as a CondCodeSDNode. If the operands are vector types
338 /// then the result type must also be a vector type.
341 /// SHL_PARTS/SRA_PARTS/SRL_PARTS - These operators are used for expanded
342 /// integer shift operations, just like ADD/SUB_PARTS. The operation
344 /// [Lo,Hi] = op [LoLHS,HiLHS], Amt
345 SHL_PARTS, SRA_PARTS, SRL_PARTS,
347 /// Conversion operators. These are all single input single output
348 /// operations. For all of these, the result type must be strictly
349 /// wider or narrower (depending on the operation) than the source
352 /// SIGN_EXTEND - Used for integer types, replicating the sign bit
356 /// ZERO_EXTEND - Used for integer types, zeroing the new bits.
359 /// ANY_EXTEND - Used for integer types. The high bits are undefined.
362 /// TRUNCATE - Completely drop the high bits.
365 /// [SU]INT_TO_FP - These operators convert integers (whose interpreted sign
366 /// depends on the first letter) to floating point.
370 /// SIGN_EXTEND_INREG - This operator atomically performs a SHL/SRA pair to
371 /// sign extend a small value in a large integer register (e.g. sign
372 /// extending the low 8 bits of a 32-bit register to fill the top 24 bits
373 /// with the 7th bit). The size of the smaller type is indicated by the 1th
374 /// operand, a ValueType node.
377 /// FP_TO_[US]INT - Convert a floating point value to a signed or unsigned
382 /// X = FP_ROUND(Y, TRUNC) - Rounding 'Y' from a larger floating point type
383 /// down to the precision of the destination VT. TRUNC is a flag, which is
384 /// always an integer that is zero or one. If TRUNC is 0, this is a
385 /// normal rounding, if it is 1, this FP_ROUND is known to not change the
388 /// The TRUNC = 1 case is used in cases where we know that the value will
389 /// not be modified by the node, because Y is not using any of the extra
390 /// precision of source type. This allows certain transformations like
391 /// FP_EXTEND(FP_ROUND(X,1)) -> X which are not safe for
392 /// FP_EXTEND(FP_ROUND(X,0)) because the extra bits aren't removed.
395 /// FLT_ROUNDS_ - Returns current rounding mode:
398 /// 1 Round to nearest
403 /// X = FP_ROUND_INREG(Y, VT) - This operator takes an FP register, and
404 /// rounds it to a floating point value. It then promotes it and returns it
405 /// in a register of the same size. This operation effectively just
406 /// discards excess precision. The type to round down to is specified by
407 /// the VT operand, a VTSDNode.
410 /// X = FP_EXTEND(Y) - Extend a smaller FP type into a larger FP type.
413 /// BITCAST - This operator converts between integer, vector and FP
414 /// values, as if the value was stored to memory with one type and loaded
415 /// from the same address with the other type (or equivalently for vector
416 /// format conversions, etc). The source and result are required to have
417 /// the same bit size (e.g. f32 <-> i32). This can also be used for
418 /// int-to-int or fp-to-fp conversions, but that is a noop, deleted by
422 /// CONVERT_RNDSAT - This operator is used to support various conversions
423 /// between various types (float, signed, unsigned and vectors of those
424 /// types) with rounding and saturation. NOTE: Avoid using this operator as
425 /// most target don't support it and the operator might be removed in the
426 /// future. It takes the following arguments:
428 /// 1) dest type (type to convert to)
429 /// 2) src type (type to convert from)
431 /// 4) saturation imm
432 /// 5) ISD::CvtCode indicating the type of conversion to do
435 /// FP16_TO_FP32, FP32_TO_FP16 - These operators are used to perform
436 /// promotions and truncation for half-precision (16 bit) floating
437 /// numbers. We need special nodes since FP16 is a storage-only type with
438 /// special semantics of operations.
439 FP16_TO_FP32, FP32_TO_FP16,
441 /// FNEG, FABS, FSQRT, FSIN, FCOS, FPOWI, FPOW,
442 /// FLOG, FLOG2, FLOG10, FEXP, FEXP2,
443 /// FCEIL, FTRUNC, FRINT, FNEARBYINT, FROUND, FFLOOR - Perform various unary
444 /// floating point operations. These are inspired by libm.
445 FNEG, FABS, FSQRT, FSIN, FCOS, FPOWI, FPOW,
446 FLOG, FLOG2, FLOG10, FEXP, FEXP2,
447 FCEIL, FTRUNC, FRINT, FNEARBYINT, FROUND, FFLOOR,
449 /// FSINCOS - Compute both fsin and fcos as a single operation.
452 /// LOAD and STORE have token chains as their first operand, then the same
453 /// operands as an LLVM load/store instruction, then an offset node that
454 /// is added / subtracted from the base pointer to form the address (for
455 /// indexed memory ops).
458 /// DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned
459 /// to a specified boundary. This node always has two return values: a new
460 /// stack pointer value and a chain. The first operand is the token chain,
461 /// the second is the number of bytes to allocate, and the third is the
462 /// alignment boundary. The size is guaranteed to be a multiple of the
463 /// stack alignment, and the alignment is guaranteed to be bigger than the
464 /// stack alignment (if required) or 0 to get standard stack alignment.
467 /// Control flow instructions. These all have token chains.
469 /// BR - Unconditional branch. The first operand is the chain
470 /// operand, the second is the MBB to branch to.
473 /// BRIND - Indirect branch. The first operand is the chain, the second
474 /// is the value to branch to, which must be of the same type as the
475 /// target's pointer type.
478 /// BR_JT - Jumptable branch. The first operand is the chain, the second
479 /// is the jumptable index, the last one is the jumptable entry index.
482 /// BRCOND - Conditional branch. The first operand is the chain, the
483 /// second is the condition, the third is the block to branch to if the
484 /// condition is true. If the type of the condition is not i1, then the
485 /// high bits must conform to getBooleanContents.
488 /// BR_CC - Conditional branch. The behavior is like that of SELECT_CC, in
489 /// that the condition is represented as condition code, and two nodes to
490 /// compare, rather than as a combined SetCC node. The operands in order
491 /// are chain, cc, lhs, rhs, block to branch to if condition is true.
494 /// INLINEASM - Represents an inline asm block. This node always has two
495 /// return values: a chain and a flag result. The inputs are as follows:
496 /// Operand #0 : Input chain.
497 /// Operand #1 : a ExternalSymbolSDNode with a pointer to the asm string.
498 /// Operand #2 : a MDNodeSDNode with the !srcloc metadata.
499 /// Operand #3 : HasSideEffect, IsAlignStack bits.
500 /// After this, it is followed by a list of operands with this format:
501 /// ConstantSDNode: Flags that encode whether it is a mem or not, the
502 /// of operands that follow, etc. See InlineAsm.h.
503 /// ... however many operands ...
504 /// Operand #last: Optional, an incoming flag.
506 /// The variable width operands are required to represent target addressing
507 /// modes as a single "operand", even though they may have multiple
511 /// EH_LABEL - Represents a label in mid basic block used to track
512 /// locations needed for debug and exception handling tables. These nodes
513 /// take a chain as input and return a chain.
516 /// STACKSAVE - STACKSAVE has one operand, an input chain. It produces a
517 /// value, the same type as the pointer type for the system, and an output
521 /// STACKRESTORE has two operands, an input chain and a pointer to restore
522 /// to it returns an output chain.
525 /// CALLSEQ_START/CALLSEQ_END - These operators mark the beginning and end
526 /// of a call sequence, and carry arbitrary information that target might
527 /// want to know. The first operand is a chain, the rest are specified by
528 /// the target and not touched by the DAG optimizers.
529 /// CALLSEQ_START..CALLSEQ_END pairs may not be nested.
530 CALLSEQ_START, // Beginning of a call sequence
531 CALLSEQ_END, // End of a call sequence
533 /// VAARG - VAARG has four operands: an input chain, a pointer, a SRCVALUE,
534 /// and the alignment. It returns a pair of values: the vaarg value and a
538 /// VACOPY - VACOPY has 5 operands: an input chain, a destination pointer,
539 /// a source pointer, a SRCVALUE for the destination, and a SRCVALUE for the
543 /// VAEND, VASTART - VAEND and VASTART have three operands: an input chain,
544 /// pointer, and a SRCVALUE.
547 /// SRCVALUE - This is a node type that holds a Value* that is used to
548 /// make reference to a value in the LLVM IR.
551 /// MDNODE_SDNODE - This is a node that holdes an MDNode*, which is used to
552 /// reference metadata in the IR.
555 /// PCMARKER - This corresponds to the pcmarker intrinsic.
558 /// READCYCLECOUNTER - This corresponds to the readcyclecounter intrinsic.
559 /// The only operand is a chain and a value and a chain are produced. The
560 /// value is the contents of the architecture specific cycle counter like
561 /// register (or other high accuracy low latency clock source)
564 /// HANDLENODE node - Used as a handle for various purposes.
567 /// INIT_TRAMPOLINE - This corresponds to the init_trampoline intrinsic. It
568 /// takes as input a token chain, the pointer to the trampoline, the pointer
569 /// to the nested function, the pointer to pass for the 'nest' parameter, a
570 /// SRCVALUE for the trampoline and another for the nested function
571 /// (allowing targets to access the original Function*).
572 /// It produces a token chain as output.
575 /// ADJUST_TRAMPOLINE - This corresponds to the adjust_trampoline intrinsic.
576 /// It takes a pointer to the trampoline and produces a (possibly) new
577 /// pointer to the same trampoline with platform-specific adjustments
578 /// applied. The pointer it returns points to an executable block of code.
581 /// TRAP - Trapping instruction
584 /// DEBUGTRAP - Trap intended to get the attention of a debugger.
587 /// PREFETCH - This corresponds to a prefetch intrinsic. The first operand
588 /// is the chain. The other operands are the address to prefetch,
589 /// read / write specifier, locality specifier and instruction / data cache
593 /// OUTCHAIN = ATOMIC_FENCE(INCHAIN, ordering, scope)
594 /// This corresponds to the fence instruction. It takes an input chain, and
595 /// two integer constants: an AtomicOrdering and a SynchronizationScope.
598 /// Val, OUTCHAIN = ATOMIC_LOAD(INCHAIN, ptr)
599 /// This corresponds to "load atomic" instruction.
602 /// OUTCHAIN = ATOMIC_LOAD(INCHAIN, ptr, val)
603 /// This corresponds to "store atomic" instruction.
606 /// Val, OUTCHAIN = ATOMIC_CMP_SWAP(INCHAIN, ptr, cmp, swap)
607 /// This corresponds to the cmpxchg instruction.
610 /// Val, OUTCHAIN = ATOMIC_SWAP(INCHAIN, ptr, amt)
611 /// Val, OUTCHAIN = ATOMIC_LOAD_[OpName](INCHAIN, ptr, amt)
612 /// These correspond to the atomicrmw instruction.
625 /// This corresponds to the llvm.lifetime.* intrinsics. The first operand
626 /// is the chain and the second operand is the alloca pointer.
627 LIFETIME_START, LIFETIME_END,
629 /// BUILTIN_OP_END - This must be the last enum value in this list.
630 /// The target-specific pre-isel opcode values start here.
634 /// FIRST_TARGET_MEMORY_OPCODE - Target-specific pre-isel operations
635 /// which do not reference a specific memory location should be less than
636 /// this value. Those that do must not be less than this value, and can
637 /// be used with SelectionDAG::getMemIntrinsicNode.
638 static const int FIRST_TARGET_MEMORY_OPCODE = BUILTIN_OP_END+180;
640 //===--------------------------------------------------------------------===//
641 /// MemIndexedMode enum - This enum defines the load / store indexed
642 /// addressing modes.
644 /// UNINDEXED "Normal" load / store. The effective address is already
645 /// computed and is available in the base pointer. The offset
646 /// operand is always undefined. In addition to producing a
647 /// chain, an unindexed load produces one value (result of the
648 /// load); an unindexed store does not produce a value.
650 /// PRE_INC Similar to the unindexed mode where the effective address is
651 /// PRE_DEC the value of the base pointer add / subtract the offset.
652 /// It considers the computation as being folded into the load /
653 /// store operation (i.e. the load / store does the address
654 /// computation as well as performing the memory transaction).
655 /// The base operand is always undefined. In addition to
656 /// producing a chain, pre-indexed load produces two values
657 /// (result of the load and the result of the address
658 /// computation); a pre-indexed store produces one value (result
659 /// of the address computation).
661 /// POST_INC The effective address is the value of the base pointer. The
662 /// POST_DEC value of the offset operand is then added to / subtracted
663 /// from the base after memory transaction. In addition to
664 /// producing a chain, post-indexed load produces two values
665 /// (the result of the load and the result of the base +/- offset
666 /// computation); a post-indexed store produces one value (the
667 /// the result of the base +/- offset computation).
668 enum MemIndexedMode {
677 //===--------------------------------------------------------------------===//
678 /// LoadExtType enum - This enum defines the three variants of LOADEXT
679 /// (load with extension).
681 /// SEXTLOAD loads the integer operand and sign extends it to a larger
682 /// integer result type.
683 /// ZEXTLOAD loads the integer operand and zero extends it to a larger
684 /// integer result type.
685 /// EXTLOAD is used for two things: floating point extending loads and
686 /// integer extending loads [the top bits are undefined].
695 //===--------------------------------------------------------------------===//
696 /// ISD::CondCode enum - These are ordered carefully to make the bitfields
697 /// below work out, when considering SETFALSE (something that never exists
698 /// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered
699 /// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal
700 /// to. If the "N" column is 1, the result of the comparison is undefined if
701 /// the input is a NAN.
703 /// All of these (except for the 'always folded ops') should be handled for
704 /// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT,
705 /// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used.
707 /// Note that these are laid out in a specific order to allow bit-twiddling
708 /// to transform conditions.
710 // Opcode N U L G E Intuitive operation
711 SETFALSE, // 0 0 0 0 Always false (always folded)
712 SETOEQ, // 0 0 0 1 True if ordered and equal
713 SETOGT, // 0 0 1 0 True if ordered and greater than
714 SETOGE, // 0 0 1 1 True if ordered and greater than or equal
715 SETOLT, // 0 1 0 0 True if ordered and less than
716 SETOLE, // 0 1 0 1 True if ordered and less than or equal
717 SETONE, // 0 1 1 0 True if ordered and operands are unequal
718 SETO, // 0 1 1 1 True if ordered (no nans)
719 SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y)
720 SETUEQ, // 1 0 0 1 True if unordered or equal
721 SETUGT, // 1 0 1 0 True if unordered or greater than
722 SETUGE, // 1 0 1 1 True if unordered, greater than, or equal
723 SETULT, // 1 1 0 0 True if unordered or less than
724 SETULE, // 1 1 0 1 True if unordered, less than, or equal
725 SETUNE, // 1 1 1 0 True if unordered or not equal
726 SETTRUE, // 1 1 1 1 Always true (always folded)
727 // Don't care operations: undefined if the input is a nan.
728 SETFALSE2, // 1 X 0 0 0 Always false (always folded)
729 SETEQ, // 1 X 0 0 1 True if equal
730 SETGT, // 1 X 0 1 0 True if greater than
731 SETGE, // 1 X 0 1 1 True if greater than or equal
732 SETLT, // 1 X 1 0 0 True if less than
733 SETLE, // 1 X 1 0 1 True if less than or equal
734 SETNE, // 1 X 1 1 0 True if not equal
735 SETTRUE2, // 1 X 1 1 1 Always true (always folded)
737 SETCC_INVALID // Marker value.
740 /// isSignedIntSetCC - Return true if this is a setcc instruction that
741 /// performs a signed comparison when used with integer operands.
742 inline bool isSignedIntSetCC(CondCode Code) {
743 return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE;
746 /// isUnsignedIntSetCC - Return true if this is a setcc instruction that
747 /// performs an unsigned comparison when used with integer operands.
748 inline bool isUnsignedIntSetCC(CondCode Code) {
749 return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE;
752 /// isTrueWhenEqual - Return true if the specified condition returns true if
753 /// the two operands to the condition are equal. Note that if one of the two
754 /// operands is a NaN, this value is meaningless.
755 inline bool isTrueWhenEqual(CondCode Cond) {
756 return ((int)Cond & 1) != 0;
759 /// getUnorderedFlavor - This function returns 0 if the condition is always
760 /// false if an operand is a NaN, 1 if the condition is always true if the
761 /// operand is a NaN, and 2 if the condition is undefined if the operand is a
763 inline unsigned getUnorderedFlavor(CondCode Cond) {
764 return ((int)Cond >> 3) & 3;
767 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
768 /// 'op' is a valid SetCC operation.
769 CondCode getSetCCInverse(CondCode Operation, bool isInteger);
771 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
772 /// when given the operation for (X op Y).
773 CondCode getSetCCSwappedOperands(CondCode Operation);
775 /// getSetCCOrOperation - Return the result of a logical OR between different
776 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This
777 /// function returns SETCC_INVALID if it is not possible to represent the
778 /// resultant comparison.
779 CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger);
781 /// getSetCCAndOperation - Return the result of a logical AND between
782 /// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
783 /// function returns SETCC_INVALID if it is not possible to represent the
784 /// resultant comparison.
785 CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger);
787 //===--------------------------------------------------------------------===//
788 /// CvtCode enum - This enum defines the various converts CONVERT_RNDSAT
791 CVT_FF, /// Float from Float
792 CVT_FS, /// Float from Signed
793 CVT_FU, /// Float from Unsigned
794 CVT_SF, /// Signed from Float
795 CVT_UF, /// Unsigned from Float
796 CVT_SS, /// Signed from Signed
797 CVT_SU, /// Signed from Unsigned
798 CVT_US, /// Unsigned from Signed
799 CVT_UU, /// Unsigned from Unsigned
800 CVT_INVALID /// Marker - Invalid opcode
803 } // end llvm::ISD namespace
805 } // end llvm namespace