1 //===- Target.td - Target Independent TableGen interface ---*- tablegen -*-===//
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 defines the target-independent interfaces which should be
11 // implemented by each target which is using a TableGen based code generator.
13 //===----------------------------------------------------------------------===//
15 // Include all information about LLVM intrinsics.
16 include "llvm/Intrinsics.td"
18 //===----------------------------------------------------------------------===//
19 // Register file description - These classes are used to fill in the target
20 // description classes.
22 class RegisterClass; // Forward def
24 // SubRegIndex - Use instances of SubRegIndex to identify subregisters.
25 class SubRegIndex<list<SubRegIndex> comps = []> {
26 string Namespace = "";
28 // ComposedOf - A list of two SubRegIndex instances, [A, B].
29 // This indicates that this SubRegIndex is the result of composing A and B.
30 list<SubRegIndex> ComposedOf = comps;
33 // RegAltNameIndex - The alternate name set to use for register operands of
34 // this register class when printing.
35 class RegAltNameIndex {
36 string Namespace = "";
38 def NoRegAltName : RegAltNameIndex;
40 // Register - You should define one instance of this class for each register
41 // in the target machine. String n will become the "name" of the register.
42 class Register<string n, list<string> altNames = []> {
43 string Namespace = "";
45 list<string> AltNames = altNames;
47 // Aliases - A list of registers that this register overlaps with. A read or
48 // modification of this register can potentially read or modify the aliased
50 list<Register> Aliases = [];
52 // SubRegs - A list of registers that are parts of this register. Note these
53 // are "immediate" sub-registers and the registers within the list do not
54 // themselves overlap. e.g. For X86, EAX's SubRegs list contains only [AX],
56 list<Register> SubRegs = [];
58 // SubRegIndices - For each register in SubRegs, specify the SubRegIndex used
59 // to address it. Sub-sub-register indices are automatically inherited from
61 list<SubRegIndex> SubRegIndices = [];
63 // RegAltNameIndices - The alternate name indices which are valid for this
65 list<RegAltNameIndex> RegAltNameIndices = [];
67 // CompositeIndices - Specify subreg indices that don't correspond directly to
68 // a register in SubRegs and are not inherited. The following formats are
71 // (a) Identity - Reg:a == Reg
72 // (a b) Alias - Reg:a == Reg:b
73 // (a b,c) Composite - Reg:a == (Reg:b):c
75 // This can be used to disambiguate a sub-sub-register that exists in more
76 // than one subregister and other weird stuff.
77 list<dag> CompositeIndices = [];
79 // DwarfNumbers - Numbers used internally by gcc/gdb to identify the register.
80 // These values can be determined by locating the <target>.h file in the
81 // directory llvmgcc/gcc/config/<target>/ and looking for REGISTER_NAMES. The
82 // order of these names correspond to the enumeration used by gcc. A value of
83 // -1 indicates that the gcc number is undefined and -2 that register number
84 // is invalid for this mode/flavour.
85 list<int> DwarfNumbers = [];
87 // CostPerUse - Additional cost of instructions using this register compared
88 // to other registers in its class. The register allocator will try to
89 // minimize the number of instructions using a register with a CostPerUse.
90 // This is used by the x86-64 and ARM Thumb targets where some registers
91 // require larger instruction encodings.
94 // CoveredBySubRegs - When this bit is set, the value of this register is
95 // completely determined by the value of its sub-registers. For example, the
96 // x86 register AX is covered by its sub-registers AL and AH, but EAX is not
97 // covered by its sub-register AX.
98 bit CoveredBySubRegs = 0;
101 // RegisterWithSubRegs - This can be used to define instances of Register which
102 // need to specify sub-registers.
103 // List "subregs" specifies which registers are sub-registers to this one. This
104 // is used to populate the SubRegs and AliasSet fields of TargetRegisterDesc.
105 // This allows the code generator to be careful not to put two values with
106 // overlapping live ranges into registers which alias.
107 class RegisterWithSubRegs<string n, list<Register> subregs> : Register<n> {
108 let SubRegs = subregs;
111 // RegisterClass - Now that all of the registers are defined, and aliases
112 // between registers are defined, specify which registers belong to which
113 // register classes. This also defines the default allocation order of
114 // registers by register allocators.
116 class RegisterClass<string namespace, list<ValueType> regTypes, int alignment,
117 dag regList, RegAltNameIndex idx = NoRegAltName> {
118 string Namespace = namespace;
120 // RegType - Specify the list ValueType of the registers in this register
121 // class. Note that all registers in a register class must have the same
122 // ValueTypes. This is a list because some targets permit storing different
123 // types in same register, for example vector values with 128-bit total size,
124 // but different count/size of items, like SSE on x86.
126 list<ValueType> RegTypes = regTypes;
128 // Size - Specify the spill size in bits of the registers. A default value of
129 // zero lets tablgen pick an appropriate size.
132 // Alignment - Specify the alignment required of the registers when they are
133 // stored or loaded to memory.
135 int Alignment = alignment;
137 // CopyCost - This value is used to specify the cost of copying a value
138 // between two registers in this register class. The default value is one
139 // meaning it takes a single instruction to perform the copying. A negative
140 // value means copying is extremely expensive or impossible.
143 // MemberList - Specify which registers are in this class. If the
144 // allocation_order_* method are not specified, this also defines the order of
145 // allocation used by the register allocator.
147 dag MemberList = regList;
149 // AltNameIndex - The alternate register name to use when printing operands
150 // of this register class. Every register in the register class must have
151 // a valid alternate name for the given index.
152 RegAltNameIndex altNameIndex = idx;
154 // SubRegClasses - Specify the register class of subregisters as a list of
155 // dags: (RegClass SubRegIndex, SubRegindex, ...)
156 list<dag> SubRegClasses = [];
158 // isAllocatable - Specify that the register class can be used for virtual
159 // registers and register allocation. Some register classes are only used to
160 // model instruction operand constraints, and should have isAllocatable = 0.
161 bit isAllocatable = 1;
163 // AltOrders - List of alternative allocation orders. The default order is
164 // MemberList itself, and that is good enough for most targets since the
165 // register allocators automatically remove reserved registers and move
166 // callee-saved registers to the end.
167 list<dag> AltOrders = [];
169 // AltOrderSelect - The body of a function that selects the allocation order
170 // to use in a given machine function. The code will be inserted in a
171 // function like this:
173 // static inline unsigned f(const MachineFunction &MF) { ... }
175 // The function should return 0 to select the default order defined by
176 // MemberList, 1 to select the first AltOrders entry and so on.
177 code AltOrderSelect = [{}];
180 // The memberList in a RegisterClass is a dag of set operations. TableGen
181 // evaluates these set operations and expand them into register lists. These
182 // are the most common operation, see test/TableGen/SetTheory.td for more
183 // examples of what is possible:
185 // (add R0, R1, R2) - Set Union. Each argument can be an individual register, a
186 // register class, or a sub-expression. This is also the way to simply list
189 // (sub GPR, SP) - Set difference. Subtract the last arguments from the first.
191 // (and GPR, CSR) - Set intersection. All registers from the first set that are
192 // also in the second set.
194 // (sequence "R%u", 0, 15) -> [R0, R1, ..., R15]. Generate a sequence of
195 // numbered registers.
197 // (shl GPR, 4) - Remove the first N elements.
199 // (trunc GPR, 4) - Truncate after the first N elements.
201 // (rotl GPR, 1) - Rotate N places to the left.
203 // (rotr GPR, 1) - Rotate N places to the right.
205 // (decimate GPR, 2) - Pick every N'th element, starting with the first.
207 // (interleave A, B, ...) - Interleave the elements from each argument list.
209 // All of these operators work on ordered sets, not lists. That means
210 // duplicates are removed from sub-expressions.
212 // Set operators. The rest is defined in TargetSelectionDAG.td.
217 // RegisterTuples - Automatically generate super-registers by forming tuples of
218 // sub-registers. This is useful for modeling register sequence constraints
219 // with pseudo-registers that are larger than the architectural registers.
221 // The sub-register lists are zipped together:
223 // def EvenOdd : RegisterTuples<[sube, subo], [(add R0, R2), (add R1, R3)]>;
225 // Generates the same registers as:
227 // let SubRegIndices = [sube, subo] in {
228 // def R0_R1 : RegisterWithSubRegs<"", [R0, R1]>;
229 // def R2_R3 : RegisterWithSubRegs<"", [R2, R3]>;
232 // The generated pseudo-registers inherit super-classes and fields from their
233 // first sub-register. Most fields from the Register class are inferred, and
234 // the AsmName and Dwarf numbers are cleared.
236 // RegisterTuples instances can be used in other set operations to form
237 // register classes and so on. This is the only way of using the generated
239 class RegisterTuples<list<SubRegIndex> Indices, list<dag> Regs> {
240 // SubRegs - N lists of registers to be zipped up. Super-registers are
241 // synthesized from the first element of each SubRegs list, the second
242 // element and so on.
243 list<dag> SubRegs = Regs;
245 // SubRegIndices - N SubRegIndex instances. This provides the names of the
246 // sub-registers in the synthesized super-registers.
247 list<SubRegIndex> SubRegIndices = Indices;
249 // Compose sub-register indices like in a normal Register.
250 list<dag> CompositeIndices = [];
254 //===----------------------------------------------------------------------===//
255 // DwarfRegNum - This class provides a mapping of the llvm register enumeration
256 // to the register numbering used by gcc and gdb. These values are used by a
257 // debug information writer to describe where values may be located during
259 class DwarfRegNum<list<int> Numbers> {
260 // DwarfNumbers - Numbers used internally by gcc/gdb to identify the register.
261 // These values can be determined by locating the <target>.h file in the
262 // directory llvmgcc/gcc/config/<target>/ and looking for REGISTER_NAMES. The
263 // order of these names correspond to the enumeration used by gcc. A value of
264 // -1 indicates that the gcc number is undefined and -2 that register number
265 // is invalid for this mode/flavour.
266 list<int> DwarfNumbers = Numbers;
269 // DwarfRegAlias - This class declares that a given register uses the same dwarf
270 // numbers as another one. This is useful for making it clear that the two
271 // registers do have the same number. It also lets us build a mapping
272 // from dwarf register number to llvm register.
273 class DwarfRegAlias<Register reg> {
274 Register DwarfAlias = reg;
277 //===----------------------------------------------------------------------===//
278 // Pull in the common support for scheduling
280 include "llvm/Target/TargetSchedule.td"
282 class Predicate; // Forward def
284 //===----------------------------------------------------------------------===//
285 // Instruction set description - These classes correspond to the C++ classes in
286 // the Target/TargetInstrInfo.h file.
289 string Namespace = "";
291 dag OutOperandList; // An dag containing the MI def operand list.
292 dag InOperandList; // An dag containing the MI use operand list.
293 string AsmString = ""; // The .s format to print the instruction with.
295 // Pattern - Set to the DAG pattern for this instruction, if we know of one,
296 // otherwise, uninitialized.
299 // The follow state will eventually be inferred automatically from the
300 // instruction pattern.
302 list<Register> Uses = []; // Default to using no non-operand registers
303 list<Register> Defs = []; // Default to modifying no non-operand registers
305 // Predicates - List of predicates which will be turned into isel matching
307 list<Predicate> Predicates = [];
309 // Size - Size of encoded instruction, or zero if the size cannot be determined
313 // DecoderNamespace - The "namespace" in which this instruction exists, on
314 // targets like ARM which multiple ISA namespaces exist.
315 string DecoderNamespace = "";
317 // Code size, for instruction selection.
318 // FIXME: What does this actually mean?
321 // Added complexity passed onto matching pattern.
322 int AddedComplexity = 0;
324 // These bits capture information about the high-level semantics of the
326 bit isReturn = 0; // Is this instruction a return instruction?
327 bit isBranch = 0; // Is this instruction a branch instruction?
328 bit isIndirectBranch = 0; // Is this instruction an indirect branch?
329 bit isCompare = 0; // Is this instruction a comparison instruction?
330 bit isMoveImm = 0; // Is this instruction a move immediate instruction?
331 bit isBitcast = 0; // Is this instruction a bitcast instruction?
332 bit isBarrier = 0; // Can control flow fall through this instruction?
333 bit isCall = 0; // Is this instruction a call instruction?
334 bit canFoldAsLoad = 0; // Can this be folded as a simple memory operand?
335 bit mayLoad = 0; // Is it possible for this inst to read memory?
336 bit mayStore = 0; // Is it possible for this inst to write memory?
337 bit isConvertibleToThreeAddress = 0; // Can this 2-addr instruction promote?
338 bit isCommutable = 0; // Is this 3 operand instruction commutable?
339 bit isTerminator = 0; // Is this part of the terminator for a basic block?
340 bit isReMaterializable = 0; // Is this instruction re-materializable?
341 bit isPredicable = 0; // Is this instruction predicable?
342 bit hasDelaySlot = 0; // Does this instruction have an delay slot?
343 bit usesCustomInserter = 0; // Pseudo instr needing special help.
344 bit hasPostISelHook = 0; // To be *adjusted* after isel by target hook.
345 bit hasCtrlDep = 0; // Does this instruction r/w ctrl-flow chains?
346 bit isNotDuplicable = 0; // Is it unsafe to duplicate this instruction?
347 bit isAsCheapAsAMove = 0; // As cheap (or cheaper) than a move instruction.
348 bit hasExtraSrcRegAllocReq = 0; // Sources have special regalloc requirement?
349 bit hasExtraDefRegAllocReq = 0; // Defs have special regalloc requirement?
350 bit isPseudo = 0; // Is this instruction a pseudo-instruction?
351 // If so, won't have encoding information for
352 // the [MC]CodeEmitter stuff.
354 // Side effect flags - When set, the flags have these meanings:
356 // hasSideEffects - The instruction has side effects that are not
357 // captured by any operands of the instruction or other flags.
359 // neverHasSideEffects - Set on an instruction with no pattern if it has no
361 bit hasSideEffects = 0;
362 bit neverHasSideEffects = 0;
364 // Is this instruction a "real" instruction (with a distinct machine
365 // encoding), or is it a pseudo instruction used for codegen modeling
367 // FIXME: For now this is distinct from isPseudo, above, as code-gen-only
368 // instructions can (and often do) still have encoding information
369 // associated with them. Once we've migrated all of them over to true
370 // pseudo-instructions that are lowered to real instructions prior to
371 // the printer/emitter, we can remove this attribute and just use isPseudo.
373 // The intended use is:
374 // isPseudo: Does not have encoding information and should be expanded,
375 // at the latest, during lowering to MCInst.
377 // isCodeGenOnly: Does have encoding information and can go through to the
378 // CodeEmitter unchanged, but duplicates a canonical instruction
379 // definition's encoding and should be ignored when constructing the
380 // assembler match tables.
381 bit isCodeGenOnly = 0;
383 // Is this instruction a pseudo instruction for use by the assembler parser.
384 bit isAsmParserOnly = 0;
386 InstrItinClass Itinerary = NoItinerary;// Execution steps used for scheduling.
388 string Constraints = ""; // OperandConstraint, e.g. $src = $dst.
390 /// DisableEncoding - List of operand names (e.g. "$op1,$op2") that should not
391 /// be encoded into the output machineinstr.
392 string DisableEncoding = "";
394 string PostEncoderMethod = "";
395 string DecoderMethod = "";
397 /// Target-specific flags. This becomes the TSFlags field in TargetInstrDesc.
398 bits<64> TSFlags = 0;
400 ///@name Assembler Parser Support
403 string AsmMatchConverter = "";
405 string TwoOperandAliasConstraint = "";
410 /// PseudoInstExpansion - Expansion information for a pseudo-instruction.
411 /// Which instruction it expands to and how the operands map from the
413 class PseudoInstExpansion<dag Result> {
414 dag ResultInst = Result; // The instruction to generate.
418 /// Predicates - These are extra conditionals which are turned into instruction
419 /// selector matching code. Currently each predicate is just a string.
420 class Predicate<string cond> {
421 string CondString = cond;
423 /// AssemblerMatcherPredicate - If this feature can be used by the assembler
424 /// matcher, this is true. Targets should set this by inheriting their
425 /// feature from the AssemblerPredicate class in addition to Predicate.
426 bit AssemblerMatcherPredicate = 0;
428 /// AssemblerCondString - Name of the subtarget feature being tested used
429 /// as alternative condition string used for assembler matcher.
430 /// e.g. "ModeThumb" is translated to "(Bits & ModeThumb) != 0".
431 /// "!ModeThumb" is translated to "(Bits & ModeThumb) == 0".
432 /// It can also list multiple features separated by ",".
433 /// e.g. "ModeThumb,FeatureThumb2" is translated to
434 /// "(Bits & ModeThumb) != 0 && (Bits & FeatureThumb2) != 0".
435 string AssemblerCondString = "";
438 /// NoHonorSignDependentRounding - This predicate is true if support for
439 /// sign-dependent-rounding is not enabled.
440 def NoHonorSignDependentRounding
441 : Predicate<"!TM.Options.HonorSignDependentRoundingFPMath()">;
443 class Requires<list<Predicate> preds> {
444 list<Predicate> Predicates = preds;
447 /// ops definition - This is just a simple marker used to identify the operand
448 /// list for an instruction. outs and ins are identical both syntactically and
449 /// semanticallyr; they are used to define def operands and use operands to
450 /// improve readibility. This should be used like this:
451 /// (outs R32:$dst), (ins R32:$src1, R32:$src2) or something similar.
456 /// variable_ops definition - Mark this instruction as taking a variable number
461 /// PointerLikeRegClass - Values that are designed to have pointer width are
462 /// derived from this. TableGen treats the register class as having a symbolic
463 /// type that it doesn't know, and resolves the actual regclass to use by using
464 /// the TargetRegisterInfo::getPointerRegClass() hook at codegen time.
465 class PointerLikeRegClass<int Kind> {
466 int RegClassKind = Kind;
470 /// ptr_rc definition - Mark this operand as being a pointer value whose
471 /// register class is resolved dynamically via a callback to TargetInstrInfo.
472 /// FIXME: We should probably change this to a class which contain a list of
473 /// flags. But currently we have but one flag.
474 def ptr_rc : PointerLikeRegClass<0>;
476 /// unknown definition - Mark this operand as being of unknown type, causing
477 /// it to be resolved by inference in the context it is used.
480 /// AsmOperandClass - Representation for the kinds of operands which the target
481 /// specific parser can create and the assembly matcher may need to distinguish.
483 /// Operand classes are used to define the order in which instructions are
484 /// matched, to ensure that the instruction which gets matched for any
485 /// particular list of operands is deterministic.
487 /// The target specific parser must be able to classify a parsed operand into a
488 /// unique class which does not partially overlap with any other classes. It can
489 /// match a subset of some other class, in which case the super class field
490 /// should be defined.
491 class AsmOperandClass {
492 /// The name to use for this class, which should be usable as an enum value.
495 /// The super classes of this operand.
496 list<AsmOperandClass> SuperClasses = [];
498 /// The name of the method on the target specific operand to call to test
499 /// whether the operand is an instance of this class. If not set, this will
500 /// default to "isFoo", where Foo is the AsmOperandClass name. The method
501 /// signature should be:
502 /// bool isFoo() const;
503 string PredicateMethod = ?;
505 /// The name of the method on the target specific operand to call to add the
506 /// target specific operand to an MCInst. If not set, this will default to
507 /// "addFooOperands", where Foo is the AsmOperandClass name. The method
508 /// signature should be:
509 /// void addFooOperands(MCInst &Inst, unsigned N) const;
510 string RenderMethod = ?;
512 /// The name of the method on the target specific operand to call to custom
513 /// handle the operand parsing. This is useful when the operands do not relate
514 /// to immediates or registers and are very instruction specific (as flags to
515 /// set in a processor register, coprocessor number, ...).
516 string ParserMethod = ?;
519 def ImmAsmOperand : AsmOperandClass {
523 /// Operand Types - These provide the built-in operand types that may be used
524 /// by a target. Targets can optionally provide their own operand types as
525 /// needed, though this should not be needed for RISC targets.
526 class Operand<ValueType ty> {
528 string PrintMethod = "printOperand";
529 string EncoderMethod = "";
530 string DecoderMethod = "";
531 string AsmOperandLowerMethod = ?;
532 string OperandType = "OPERAND_UNKNOWN";
533 dag MIOperandInfo = (ops);
535 // ParserMatchClass - The "match class" that operands of this type fit
536 // in. Match classes are used to define the order in which instructions are
537 // match, to ensure that which instructions gets matched is deterministic.
539 // The target specific parser must be able to classify an parsed operand into
540 // a unique class, which does not partially overlap with any other classes. It
541 // can match a subset of some other class, in which case the AsmOperandClass
542 // should declare the other operand as one of its super classes.
543 AsmOperandClass ParserMatchClass = ImmAsmOperand;
546 class RegisterOperand<RegisterClass regclass, string pm = "printOperand"> {
547 // RegClass - The register class of the operand.
548 RegisterClass RegClass = regclass;
549 // PrintMethod - The target method to call to print register operands of
550 // this type. The method normally will just use an alt-name index to look
551 // up the name to print. Default to the generic printOperand().
552 string PrintMethod = pm;
553 // ParserMatchClass - The "match class" that operands of this type fit
554 // in. Match classes are used to define the order in which instructions are
555 // match, to ensure that which instructions gets matched is deterministic.
557 // The target specific parser must be able to classify an parsed operand into
558 // a unique class, which does not partially overlap with any other classes. It
559 // can match a subset of some other class, in which case the AsmOperandClass
560 // should declare the other operand as one of its super classes.
561 AsmOperandClass ParserMatchClass;
564 let OperandType = "OPERAND_IMMEDIATE" in {
565 def i1imm : Operand<i1>;
566 def i8imm : Operand<i8>;
567 def i16imm : Operand<i16>;
568 def i32imm : Operand<i32>;
569 def i64imm : Operand<i64>;
571 def f32imm : Operand<f32>;
572 def f64imm : Operand<f64>;
575 /// zero_reg definition - Special node to stand for the zero register.
579 /// PredicateOperand - This can be used to define a predicate operand for an
580 /// instruction. OpTypes specifies the MIOperandInfo for the operand, and
581 /// AlwaysVal specifies the value of this predicate when set to "always
583 class PredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
585 let MIOperandInfo = OpTypes;
586 dag DefaultOps = AlwaysVal;
589 /// OptionalDefOperand - This is used to define a optional definition operand
590 /// for an instruction. DefaultOps is the register the operand represents if
591 /// none is supplied, e.g. zero_reg.
592 class OptionalDefOperand<ValueType ty, dag OpTypes, dag defaultops>
594 let MIOperandInfo = OpTypes;
595 dag DefaultOps = defaultops;
599 // InstrInfo - This class should only be instantiated once to provide parameters
600 // which are global to the target machine.
603 // Target can specify its instructions in either big or little-endian formats.
604 // For instance, while both Sparc and PowerPC are big-endian platforms, the
605 // Sparc manual specifies its instructions in the format [31..0] (big), while
606 // PowerPC specifies them using the format [0..31] (little).
607 bit isLittleEndianEncoding = 0;
610 // Standard Pseudo Instructions.
611 // This list must match TargetOpcodes.h and CodeGenTarget.cpp.
612 // Only these instructions are allowed in the TargetOpcode namespace.
613 let isCodeGenOnly = 1, isPseudo = 1, Namespace = "TargetOpcode" in {
614 def PHI : Instruction {
615 let OutOperandList = (outs);
616 let InOperandList = (ins variable_ops);
617 let AsmString = "PHINODE";
619 def INLINEASM : Instruction {
620 let OutOperandList = (outs);
621 let InOperandList = (ins variable_ops);
623 let neverHasSideEffects = 1; // Note side effect is encoded in an operand.
625 def PROLOG_LABEL : Instruction {
626 let OutOperandList = (outs);
627 let InOperandList = (ins i32imm:$id);
630 let isNotDuplicable = 1;
632 def EH_LABEL : Instruction {
633 let OutOperandList = (outs);
634 let InOperandList = (ins i32imm:$id);
637 let isNotDuplicable = 1;
639 def GC_LABEL : Instruction {
640 let OutOperandList = (outs);
641 let InOperandList = (ins i32imm:$id);
644 let isNotDuplicable = 1;
646 def KILL : Instruction {
647 let OutOperandList = (outs);
648 let InOperandList = (ins variable_ops);
650 let neverHasSideEffects = 1;
652 def EXTRACT_SUBREG : Instruction {
653 let OutOperandList = (outs unknown:$dst);
654 let InOperandList = (ins unknown:$supersrc, i32imm:$subidx);
656 let neverHasSideEffects = 1;
658 def INSERT_SUBREG : Instruction {
659 let OutOperandList = (outs unknown:$dst);
660 let InOperandList = (ins unknown:$supersrc, unknown:$subsrc, i32imm:$subidx);
662 let neverHasSideEffects = 1;
663 let Constraints = "$supersrc = $dst";
665 def IMPLICIT_DEF : Instruction {
666 let OutOperandList = (outs unknown:$dst);
667 let InOperandList = (ins);
669 let neverHasSideEffects = 1;
670 let isReMaterializable = 1;
671 let isAsCheapAsAMove = 1;
673 def SUBREG_TO_REG : Instruction {
674 let OutOperandList = (outs unknown:$dst);
675 let InOperandList = (ins unknown:$implsrc, unknown:$subsrc, i32imm:$subidx);
677 let neverHasSideEffects = 1;
679 def COPY_TO_REGCLASS : Instruction {
680 let OutOperandList = (outs unknown:$dst);
681 let InOperandList = (ins unknown:$src, i32imm:$regclass);
683 let neverHasSideEffects = 1;
684 let isAsCheapAsAMove = 1;
686 def DBG_VALUE : Instruction {
687 let OutOperandList = (outs);
688 let InOperandList = (ins variable_ops);
689 let AsmString = "DBG_VALUE";
690 let neverHasSideEffects = 1;
692 def REG_SEQUENCE : Instruction {
693 let OutOperandList = (outs unknown:$dst);
694 let InOperandList = (ins variable_ops);
696 let neverHasSideEffects = 1;
697 let isAsCheapAsAMove = 1;
699 def COPY : Instruction {
700 let OutOperandList = (outs unknown:$dst);
701 let InOperandList = (ins unknown:$src);
703 let neverHasSideEffects = 1;
704 let isAsCheapAsAMove = 1;
706 def BUNDLE : Instruction {
707 let OutOperandList = (outs);
708 let InOperandList = (ins variable_ops);
709 let AsmString = "BUNDLE";
713 //===----------------------------------------------------------------------===//
714 // AsmParser - This class can be implemented by targets that wish to implement
717 // Subtargets can have multiple different assembly parsers (e.g. AT&T vs Intel
718 // syntax on X86 for example).
721 // AsmParserClassName - This specifies the suffix to use for the asmparser
722 // class. Generated AsmParser classes are always prefixed with the target
724 string AsmParserClassName = "AsmParser";
726 // AsmParserInstCleanup - If non-empty, this is the name of a custom member
727 // function of the AsmParser class to call on every matched instruction.
728 // This can be used to perform target specific instruction post-processing.
729 string AsmParserInstCleanup = "";
731 def DefaultAsmParser : AsmParser;
733 //===----------------------------------------------------------------------===//
734 // AsmParserVariant - Subtargets can have multiple different assembly parsers
735 // (e.g. AT&T vs Intel syntax on X86 for example). This class can be
736 // implemented by targets to describe such variants.
738 class AsmParserVariant {
739 // Variant - AsmParsers can be of multiple different variants. Variants are
740 // used to support targets that need to parser multiple formats for the
741 // assembly language.
744 // CommentDelimiter - If given, the delimiter string used to recognize
745 // comments which are hard coded in the .td assembler strings for individual
747 string CommentDelimiter = "";
749 // RegisterPrefix - If given, the token prefix which indicates a register
750 // token. This is used by the matcher to automatically recognize hard coded
751 // register tokens as constrained registers, instead of tokens, for the
752 // purposes of matching.
753 string RegisterPrefix = "";
755 def DefaultAsmParserVariant : AsmParserVariant;
757 /// AssemblerPredicate - This is a Predicate that can be used when the assembler
758 /// matches instructions and aliases.
759 class AssemblerPredicate<string cond> {
760 bit AssemblerMatcherPredicate = 1;
761 string AssemblerCondString = cond;
764 /// TokenAlias - This class allows targets to define assembler token
765 /// operand aliases. That is, a token literal operand which is equivalent
766 /// to another, canonical, token literal. For example, ARM allows:
767 /// vmov.u32 s4, #0 -> vmov.i32, #0
768 /// 'u32' is a more specific designator for the 32-bit integer type specifier
769 /// and is legal for any instruction which accepts 'i32' as a datatype suffix.
770 /// def : TokenAlias<".u32", ".i32">;
772 /// This works by marking the match class of 'From' as a subclass of the
773 /// match class of 'To'.
774 class TokenAlias<string From, string To> {
775 string FromToken = From;
779 /// MnemonicAlias - This class allows targets to define assembler mnemonic
780 /// aliases. This should be used when all forms of one mnemonic are accepted
781 /// with a different mnemonic. For example, X86 allows:
782 /// sal %al, 1 -> shl %al, 1
783 /// sal %ax, %cl -> shl %ax, %cl
784 /// sal %eax, %cl -> shl %eax, %cl
785 /// etc. Though "sal" is accepted with many forms, all of them are directly
786 /// translated to a shl, so it can be handled with (in the case of X86, it
787 /// actually has one for each suffix as well):
788 /// def : MnemonicAlias<"sal", "shl">;
790 /// Mnemonic aliases are mapped before any other translation in the match phase,
791 /// and do allow Requires predicates, e.g.:
793 /// def : MnemonicAlias<"pushf", "pushfq">, Requires<[In64BitMode]>;
794 /// def : MnemonicAlias<"pushf", "pushfl">, Requires<[In32BitMode]>;
796 class MnemonicAlias<string From, string To> {
797 string FromMnemonic = From;
798 string ToMnemonic = To;
800 // Predicates - Predicates that must be true for this remapping to happen.
801 list<Predicate> Predicates = [];
804 /// InstAlias - This defines an alternate assembly syntax that is allowed to
805 /// match an instruction that has a different (more canonical) assembly
807 class InstAlias<string Asm, dag Result, bit Emit = 0b1> {
808 string AsmString = Asm; // The .s format to match the instruction with.
809 dag ResultInst = Result; // The MCInst to generate.
810 bit EmitAlias = Emit; // Emit the alias instead of what's aliased.
812 // Predicates - Predicates that must be true for this to match.
813 list<Predicate> Predicates = [];
816 //===----------------------------------------------------------------------===//
817 // AsmWriter - This class can be implemented by targets that need to customize
818 // the format of the .s file writer.
820 // Subtargets can have multiple different asmwriters (e.g. AT&T vs Intel syntax
821 // on X86 for example).
824 // AsmWriterClassName - This specifies the suffix to use for the asmwriter
825 // class. Generated AsmWriter classes are always prefixed with the target
827 string AsmWriterClassName = "AsmPrinter";
829 // Variant - AsmWriters can be of multiple different variants. Variants are
830 // used to support targets that need to emit assembly code in ways that are
831 // mostly the same for different targets, but have minor differences in
832 // syntax. If the asmstring contains {|} characters in them, this integer
833 // will specify which alternative to use. For example "{x|y|z}" with Variant
834 // == 1, will expand to "y".
838 // FirstOperandColumn/OperandSpacing - If the assembler syntax uses a columnar
839 // layout, the asmwriter can actually generate output in this columns (in
840 // verbose-asm mode). These two values indicate the width of the first column
841 // (the "opcode" area) and the width to reserve for subsequent operands. When
842 // verbose asm mode is enabled, operands will be indented to respect this.
843 int FirstOperandColumn = -1;
845 // OperandSpacing - Space between operand columns.
846 int OperandSpacing = -1;
848 // isMCAsmWriter - Is this assembly writer for an MC emitter? This controls
849 // generation of the printInstruction() method. For MC printers, it takes
850 // an MCInstr* operand, otherwise it takes a MachineInstr*.
851 bit isMCAsmWriter = 0;
853 def DefaultAsmWriter : AsmWriter;
856 //===----------------------------------------------------------------------===//
857 // Target - This class contains the "global" target information
860 // InstructionSet - Instruction set description for this target.
861 InstrInfo InstructionSet;
863 // AssemblyParsers - The AsmParser instances available for this target.
864 list<AsmParser> AssemblyParsers = [DefaultAsmParser];
866 /// AssemblyParserVariants - The AsmParserVariant instances available for
868 list<AsmParserVariant> AssemblyParserVariants = [DefaultAsmParserVariant];
870 // AssemblyWriters - The AsmWriter instances available for this target.
871 list<AsmWriter> AssemblyWriters = [DefaultAsmWriter];
874 //===----------------------------------------------------------------------===//
875 // SubtargetFeature - A characteristic of the chip set.
877 class SubtargetFeature<string n, string a, string v, string d,
878 list<SubtargetFeature> i = []> {
879 // Name - Feature name. Used by command line (-mattr=) to determine the
880 // appropriate target chip.
884 // Attribute - Attribute to be set by feature.
886 string Attribute = a;
888 // Value - Value the attribute to be set to by feature.
892 // Desc - Feature description. Used by command line (-mattr=) to display help
897 // Implies - Features that this feature implies are present. If one of those
898 // features isn't set, then this one shouldn't be set either.
900 list<SubtargetFeature> Implies = i;
903 //===----------------------------------------------------------------------===//
904 // Processor chip sets - These values represent each of the chip sets supported
905 // by the scheduler. Each Processor definition requires corresponding
906 // instruction itineraries.
908 class Processor<string n, ProcessorItineraries pi, list<SubtargetFeature> f> {
909 // Name - Chip set name. Used by command line (-mcpu=) to determine the
910 // appropriate target chip.
914 // ProcItin - The scheduling information for the target processor.
916 ProcessorItineraries ProcItin = pi;
918 // Features - list of
919 list<SubtargetFeature> Features = f;
922 //===----------------------------------------------------------------------===//
923 // Pull in the common support for calling conventions.
925 include "llvm/Target/TargetCallingConv.td"
927 //===----------------------------------------------------------------------===//
928 // Pull in the common support for DAG isel generation.
930 include "llvm/Target/TargetSelectionDAG.td"