class RegisterClass; // Forward def
// SubRegIndex - Use instances of SubRegIndex to identify subregisters.
-class SubRegIndex {
+class SubRegIndex<list<SubRegIndex> comps = []> {
string Namespace = "";
+
+ // ComposedOf - A list of two SubRegIndex instances, [A, B].
+ // This indicates that this SubRegIndex is the result of composing A and B.
+ list<SubRegIndex> ComposedOf = comps;
}
+// RegAltNameIndex - The alternate name set to use for register operands of
+// this register class when printing.
+class RegAltNameIndex {
+ string Namespace = "";
+}
+def NoRegAltName : RegAltNameIndex;
+
// Register - You should define one instance of this class for each register
// in the target machine. String n will become the "name" of the register.
-class Register<string n> {
+class Register<string n, list<string> altNames = []> {
string Namespace = "";
string AsmName = n;
+ list<string> AltNames = altNames;
// Aliases - A list of registers that this register overlaps with. A read or
// modification of this register can potentially read or modify the aliased
// SubRegs.
list<SubRegIndex> SubRegIndices = [];
+ // RegAltNameIndices - The alternate name indices which are valid for this
+ // register.
+ list<RegAltNameIndex> RegAltNameIndices = [];
+
// CompositeIndices - Specify subreg indices that don't correspond directly to
// a register in SubRegs and are not inherited. The following formats are
// supported:
// CostPerUse - Additional cost of instructions using this register compared
// to other registers in its class. The register allocator will try to
// minimize the number of instructions using a register with a CostPerUse.
- // This is used by the x86-64 and ARM Thumb targets where some registers
+ // This is used by the x86-64 and ARM Thumb targets where some registers
// require larger instruction encodings.
int CostPerUse = 0;
+
+ // CoveredBySubRegs - When this bit is set, the value of this register is
+ // completely determined by the value of its sub-registers. For example, the
+ // x86 register AX is covered by its sub-registers AL and AH, but EAX is not
+ // covered by its sub-register AX.
+ bit CoveredBySubRegs = 0;
+
+ // HWEncoding - The target specific hardware encoding for this register.
+ bits<16> HWEncoding = 0;
}
// RegisterWithSubRegs - This can be used to define instances of Register which
let SubRegs = subregs;
}
+// DAGOperand - An empty base class that unifies RegisterClass's and other forms
+// of Operand's that are legal as type qualifiers in DAG patterns. This should
+// only ever be used for defining multiclasses that are polymorphic over both
+// RegisterClass's and other Operand's.
+class DAGOperand { }
+
// RegisterClass - Now that all of the registers are defined, and aliases
// between registers are defined, specify which registers belong to which
// register classes. This also defines the default allocation order of
// registers by register allocators.
//
class RegisterClass<string namespace, list<ValueType> regTypes, int alignment,
- list<Register> regList> {
+ dag regList, RegAltNameIndex idx = NoRegAltName>
+ : DAGOperand {
string Namespace = namespace;
// RegType - Specify the list ValueType of the registers in this register
// allocation_order_* method are not specified, this also defines the order of
// allocation used by the register allocator.
//
- list<Register> MemberList = regList;
+ dag MemberList = regList;
- // SubRegClasses - Specify the register class of subregisters as a list of
- // dags: (RegClass SubRegIndex, SubRegindex, ...)
- list<dag> SubRegClasses = [];
+ // AltNameIndex - The alternate register name to use when printing operands
+ // of this register class. Every register in the register class must have
+ // a valid alternate name for the given index.
+ RegAltNameIndex altNameIndex = idx;
// isAllocatable - Specify that the register class can be used for virtual
// registers and register allocation. Some register classes are only used to
// model instruction operand constraints, and should have isAllocatable = 0.
bit isAllocatable = 1;
- // MethodProtos/MethodBodies - These members can be used to insert arbitrary
- // code into a generated register class. The normal usage of this is to
- // overload virtual methods.
- code MethodProtos = [{}];
- code MethodBodies = [{}];
+ // AltOrders - List of alternative allocation orders. The default order is
+ // MemberList itself, and that is good enough for most targets since the
+ // register allocators automatically remove reserved registers and move
+ // callee-saved registers to the end.
+ list<dag> AltOrders = [];
+
+ // AltOrderSelect - The body of a function that selects the allocation order
+ // to use in a given machine function. The code will be inserted in a
+ // function like this:
+ //
+ // static inline unsigned f(const MachineFunction &MF) { ... }
+ //
+ // The function should return 0 to select the default order defined by
+ // MemberList, 1 to select the first AltOrders entry and so on.
+ code AltOrderSelect = [{}];
+}
+
+// The memberList in a RegisterClass is a dag of set operations. TableGen
+// evaluates these set operations and expand them into register lists. These
+// are the most common operation, see test/TableGen/SetTheory.td for more
+// examples of what is possible:
+//
+// (add R0, R1, R2) - Set Union. Each argument can be an individual register, a
+// register class, or a sub-expression. This is also the way to simply list
+// registers.
+//
+// (sub GPR, SP) - Set difference. Subtract the last arguments from the first.
+//
+// (and GPR, CSR) - Set intersection. All registers from the first set that are
+// also in the second set.
+//
+// (sequence "R%u", 0, 15) -> [R0, R1, ..., R15]. Generate a sequence of
+// numbered registers. Takes an optional 4th operand which is a stride to use
+// when generating the sequence.
+//
+// (shl GPR, 4) - Remove the first N elements.
+//
+// (trunc GPR, 4) - Truncate after the first N elements.
+//
+// (rotl GPR, 1) - Rotate N places to the left.
+//
+// (rotr GPR, 1) - Rotate N places to the right.
+//
+// (decimate GPR, 2) - Pick every N'th element, starting with the first.
+//
+// (interleave A, B, ...) - Interleave the elements from each argument list.
+//
+// All of these operators work on ordered sets, not lists. That means
+// duplicates are removed from sub-expressions.
+
+// Set operators. The rest is defined in TargetSelectionDAG.td.
+def sequence;
+def decimate;
+def interleave;
+
+// RegisterTuples - Automatically generate super-registers by forming tuples of
+// sub-registers. This is useful for modeling register sequence constraints
+// with pseudo-registers that are larger than the architectural registers.
+//
+// The sub-register lists are zipped together:
+//
+// def EvenOdd : RegisterTuples<[sube, subo], [(add R0, R2), (add R1, R3)]>;
+//
+// Generates the same registers as:
+//
+// let SubRegIndices = [sube, subo] in {
+// def R0_R1 : RegisterWithSubRegs<"", [R0, R1]>;
+// def R2_R3 : RegisterWithSubRegs<"", [R2, R3]>;
+// }
+//
+// The generated pseudo-registers inherit super-classes and fields from their
+// first sub-register. Most fields from the Register class are inferred, and
+// the AsmName and Dwarf numbers are cleared.
+//
+// RegisterTuples instances can be used in other set operations to form
+// register classes and so on. This is the only way of using the generated
+// registers.
+class RegisterTuples<list<SubRegIndex> Indices, list<dag> Regs> {
+ // SubRegs - N lists of registers to be zipped up. Super-registers are
+ // synthesized from the first element of each SubRegs list, the second
+ // element and so on.
+ list<dag> SubRegs = Regs;
+
+ // SubRegIndices - N SubRegIndex instances. This provides the names of the
+ // sub-registers in the synthesized super-registers.
+ list<SubRegIndex> SubRegIndices = Indices;
+
+ // Compose sub-register indices like in a normal Register.
+ list<dag> CompositeIndices = [];
}
// code.
list<Predicate> Predicates = [];
- // Code size.
+ // Size - Size of encoded instruction, or zero if the size cannot be determined
+ // from the opcode.
+ int Size = 0;
+
+ // DecoderNamespace - The "namespace" in which this instruction exists, on
+ // targets like ARM which multiple ISA namespaces exist.
+ string DecoderNamespace = "";
+
+ // Code size, for instruction selection.
+ // FIXME: What does this actually mean?
int CodeSize = 0;
// Added complexity passed onto matching pattern.
bit isPredicable = 0; // Is this instruction predicable?
bit hasDelaySlot = 0; // Does this instruction have an delay slot?
bit usesCustomInserter = 0; // Pseudo instr needing special help.
+ bit hasPostISelHook = 0; // To be *adjusted* after isel by target hook.
bit hasCtrlDep = 0; // Does this instruction r/w ctrl-flow chains?
bit isNotDuplicable = 0; // Is it unsafe to duplicate this instruction?
bit isAsCheapAsAMove = 0; // As cheap (or cheaper) than a move instruction.
bit hasExtraSrcRegAllocReq = 0; // Sources have special regalloc requirement?
bit hasExtraDefRegAllocReq = 0; // Defs have special regalloc requirement?
+ bit isPseudo = 0; // Is this instruction a pseudo-instruction?
+ // If so, won't have encoding information for
+ // the [MC]CodeEmitter stuff.
// Side effect flags - When set, the flags have these meanings:
//
// Is this instruction a "real" instruction (with a distinct machine
// encoding), or is it a pseudo instruction used for codegen modeling
// purposes.
+ // FIXME: For now this is distinct from isPseudo, above, as code-gen-only
+ // instructions can (and often do) still have encoding information
+ // associated with them. Once we've migrated all of them over to true
+ // pseudo-instructions that are lowered to real instructions prior to
+ // the printer/emitter, we can remove this attribute and just use isPseudo.
+ //
+ // The intended use is:
+ // isPseudo: Does not have encoding information and should be expanded,
+ // at the latest, during lowering to MCInst.
+ //
+ // isCodeGenOnly: Does have encoding information and can go through to the
+ // CodeEmitter unchanged, but duplicates a canonical instruction
+ // definition's encoding and should be ignored when constructing the
+ // assembler match tables.
bit isCodeGenOnly = 0;
// Is this instruction a pseudo instruction for use by the assembler parser.
string AsmMatchConverter = "";
+ /// TwoOperandAliasConstraint - Enable TableGen to auto-generate a
+ /// two-operand matcher inst-alias for a three operand instruction.
+ /// For example, the arm instruction "add r3, r3, r5" can be written
+ /// as "add r3, r5". The constraint is of the same form as a tied-operand
+ /// constraint. For example, "$Rn = $Rd".
+ string TwoOperandAliasConstraint = "";
+
///@}
}
+/// PseudoInstExpansion - Expansion information for a pseudo-instruction.
+/// Which instruction it expands to and how the operands map from the
+/// pseudo.
+class PseudoInstExpansion<dag Result> {
+ dag ResultInst = Result; // The instruction to generate.
+ bit isPseudo = 1;
+}
+
/// Predicates - These are extra conditionals which are turned into instruction
/// selector matching code. Currently each predicate is just a string.
class Predicate<string cond> {
/// matcher, this is true. Targets should set this by inheriting their
/// feature from the AssemblerPredicate class in addition to Predicate.
bit AssemblerMatcherPredicate = 0;
+
+ /// AssemblerCondString - Name of the subtarget feature being tested used
+ /// as alternative condition string used for assembler matcher.
+ /// e.g. "ModeThumb" is translated to "(Bits & ModeThumb) != 0".
+ /// "!ModeThumb" is translated to "(Bits & ModeThumb) == 0".
+ /// It can also list multiple features separated by ",".
+ /// e.g. "ModeThumb,FeatureThumb2" is translated to
+ /// "(Bits & ModeThumb) != 0 && (Bits & FeatureThumb2) != 0".
+ string AssemblerCondString = "";
+
+ /// PredicateName - User-level name to use for the predicate. Mainly for use
+ /// in diagnostics such as missing feature errors in the asm matcher.
+ string PredicateName = "";
}
/// NoHonorSignDependentRounding - This predicate is true if support for
/// sign-dependent-rounding is not enabled.
def NoHonorSignDependentRounding
- : Predicate<"!HonorSignDependentRoundingFPMath()">;
+ : Predicate<"!TM.Options.HonorSignDependentRoundingFPMath()">;
class Requires<list<Predicate> preds> {
list<Predicate> Predicates = preds;
/// to immediates or registers and are very instruction specific (as flags to
/// set in a processor register, coprocessor number, ...).
string ParserMethod = ?;
+
+ // The diagnostic type to present when referencing this operand in a
+ // match failure error message. By default, use a generic "invalid operand"
+ // diagnostic. The target AsmParser maps these codes to text.
+ string DiagnosticType = "";
}
def ImmAsmOperand : AsmOperandClass {
/// Operand Types - These provide the built-in operand types that may be used
/// by a target. Targets can optionally provide their own operand types as
/// needed, though this should not be needed for RISC targets.
-class Operand<ValueType ty> {
+class Operand<ValueType ty> : DAGOperand {
ValueType Type = ty;
string PrintMethod = "printOperand";
string EncoderMethod = "";
string DecoderMethod = "";
string AsmOperandLowerMethod = ?;
+ string OperandType = "OPERAND_UNKNOWN";
dag MIOperandInfo = (ops);
// ParserMatchClass - The "match class" that operands of this type fit
AsmOperandClass ParserMatchClass = ImmAsmOperand;
}
+class RegisterOperand<RegisterClass regclass, string pm = "printOperand"> {
+ // RegClass - The register class of the operand.
+ RegisterClass RegClass = regclass;
+ // PrintMethod - The target method to call to print register operands of
+ // this type. The method normally will just use an alt-name index to look
+ // up the name to print. Default to the generic printOperand().
+ string PrintMethod = pm;
+ // ParserMatchClass - The "match class" that operands of this type fit
+ // in. Match classes are used to define the order in which instructions are
+ // match, to ensure that which instructions gets matched is deterministic.
+ //
+ // The target specific parser must be able to classify an parsed operand into
+ // a unique class, which does not partially overlap with any other classes. It
+ // can match a subset of some other class, in which case the AsmOperandClass
+ // should declare the other operand as one of its super classes.
+ AsmOperandClass ParserMatchClass;
+}
+
+let OperandType = "OPERAND_IMMEDIATE" in {
def i1imm : Operand<i1>;
def i8imm : Operand<i8>;
def i16imm : Operand<i16>;
def f32imm : Operand<f32>;
def f64imm : Operand<f64>;
+}
/// zero_reg definition - Special node to stand for the zero register.
///
// Standard Pseudo Instructions.
// This list must match TargetOpcodes.h and CodeGenTarget.cpp.
// Only these instructions are allowed in the TargetOpcode namespace.
-let isCodeGenOnly = 1, Namespace = "TargetOpcode" in {
+let isCodeGenOnly = 1, isPseudo = 1, Namespace = "TargetOpcode" in {
def PHI : Instruction {
let OutOperandList = (outs);
let InOperandList = (ins variable_ops);
let neverHasSideEffects = 1;
let isAsCheapAsAMove = 1;
}
+def BUNDLE : Instruction {
+ let OutOperandList = (outs);
+ let InOperandList = (ins variable_ops);
+ let AsmString = "BUNDLE";
+}
}
//===----------------------------------------------------------------------===//
// function of the AsmParser class to call on every matched instruction.
// This can be used to perform target specific instruction post-processing.
string AsmParserInstCleanup = "";
+}
+def DefaultAsmParser : AsmParser;
+//===----------------------------------------------------------------------===//
+// AsmParserVariant - Subtargets can have multiple different assembly parsers
+// (e.g. AT&T vs Intel syntax on X86 for example). This class can be
+// implemented by targets to describe such variants.
+//
+class AsmParserVariant {
// Variant - AsmParsers can be of multiple different variants. Variants are
// used to support targets that need to parser multiple formats for the
// assembly language.
// purposes of matching.
string RegisterPrefix = "";
}
-def DefaultAsmParser : AsmParser;
+def DefaultAsmParserVariant : AsmParserVariant;
/// AssemblerPredicate - This is a Predicate that can be used when the assembler
/// matches instructions and aliases.
-class AssemblerPredicate {
+class AssemblerPredicate<string cond, string name = ""> {
bit AssemblerMatcherPredicate = 1;
+ string AssemblerCondString = cond;
+ string PredicateName = name;
}
-
+/// TokenAlias - This class allows targets to define assembler token
+/// operand aliases. That is, a token literal operand which is equivalent
+/// to another, canonical, token literal. For example, ARM allows:
+/// vmov.u32 s4, #0 -> vmov.i32, #0
+/// 'u32' is a more specific designator for the 32-bit integer type specifier
+/// and is legal for any instruction which accepts 'i32' as a datatype suffix.
+/// def : TokenAlias<".u32", ".i32">;
+///
+/// This works by marking the match class of 'From' as a subclass of the
+/// match class of 'To'.
+class TokenAlias<string From, string To> {
+ string FromToken = From;
+ string ToToken = To;
+}
/// MnemonicAlias - This class allows targets to define assembler mnemonic
/// aliases. This should be used when all forms of one mnemonic are accepted
// AssemblyParsers - The AsmParser instances available for this target.
list<AsmParser> AssemblyParsers = [DefaultAsmParser];
+ /// AssemblyParserVariants - The AsmParserVariant instances available for
+ /// this target.
+ list<AsmParserVariant> AssemblyParserVariants = [DefaultAsmParserVariant];
+
// AssemblyWriters - The AsmWriter instances available for this target.
list<AsmWriter> AssemblyWriters = [DefaultAsmWriter];
}
//
string Name = n;
+ // SchedModel - The machine model for scheduling and instruction cost.
+ //
+ SchedMachineModel SchedModel = NoSchedModel;
+
// ProcItin - The scheduling information for the target processor.
//
ProcessorItineraries ProcItin = pi;
list<SubtargetFeature> Features = f;
}
+// ProcessorModel allows subtargets to specify the more general
+// SchedMachineModel instead if a ProcessorItinerary. Subtargets will
+// gradually move to this newer form.
+class ProcessorModel<string n, SchedMachineModel m, list<SubtargetFeature> f>
+ : Processor<n, NoItineraries, f> {
+ let SchedModel = m;
+}
+
//===----------------------------------------------------------------------===//
// Pull in the common support for calling conventions.
//
projects / oota-llvm.git / blobdiff