-//===- Target.td - Target Independent TableGen interface --------*- C++ -*-===//
+//===- Target.td - Target Independent TableGen interface ---*- tablegen -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines the target-independent interfaces which should be
// implemented by each target which is using a TableGen based code generator.
//
//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//
// Value types - These values correspond to the register types defined in the
-// ValueTypes.h file.
-class ValueType { string Namespace = "MVT"; }
-def i1 : ValueType; // One bit boolean value
-def i8 : ValueType; // 8-bit integer value
-def i16 : ValueType; // 16-bit integer value
-def i32 : ValueType; // 32-bit integer value
-def i64 : ValueType; // 64-bit integer value
-def i128 : ValueType; // 128-bit integer value
-def f32 : ValueType; // 32-bit floating point value
-def f64 : ValueType; // 64-bit floating point value
-def f80 : ValueType; // 80-bit floating point value
-def f128 : ValueType; // 128-bit floating point value
-
-class Register {
+// ValueTypes.h file. If you update anything here, you must update it there as
+// well!
+//
+class ValueType<int size, int value> {
+ string Namespace = "MVT";
+ int Size = size;
+ int Value = value;
+}
+
+def OtherVT: ValueType<0 , 0>; // "Other" value
+def i1 : ValueType<1 , 1>; // One bit boolean value
+def i8 : ValueType<8 , 2>; // 8-bit integer value
+def i16 : ValueType<16 , 3>; // 16-bit integer value
+def i32 : ValueType<32 , 4>; // 32-bit integer value
+def i64 : ValueType<64 , 5>; // 64-bit integer value
+def i128 : ValueType<128, 6>; // 128-bit integer value
+def f32 : ValueType<32 , 7>; // 32-bit floating point value
+def f64 : ValueType<64 , 8>; // 64-bit floating point value
+def f80 : ValueType<80 , 9>; // 80-bit floating point value
+def f128 : ValueType<128, 10>; // 128-bit floating point value
+def FlagVT : ValueType<0 , 11>; // Condition code or machine flag
+def isVoid : ValueType<0 , 12>; // Produces no value
+def Vector : ValueType<0 , 13>; // Abstract vector value
+def v16i8 : ValueType<128, 14>; // 16 x i8 vector value
+def v8i16 : ValueType<128, 15>; // 8 x i16 vector value
+def v4i32 : ValueType<128, 16>; // 4 x i32 vector value
+def v2i64 : ValueType<128, 17>; // 2 x i64 vector value
+def v4f32 : ValueType<128, 18>; // 4 x f32 vector value
+def v2f64 : ValueType<128, 19>; // 2 x f64 vector value
+
+//===----------------------------------------------------------------------===//
+// Register file description - These classes are used to fill in the target
+// description classes.
+
+class RegisterClass; // Forward def
+
+// 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> {
string Namespace = "";
- ValueType RegType;
+ string Name = n;
+
+ // SpillSize - If this value is set to a non-zero value, it is the size in
+ // bits of the spill slot required to hold this register. If this value is
+ // set to zero, the information is inferred from any register classes the
+ // register belongs to.
+ int SpillSize = 0;
+
+ // SpillAlignment - This value is used to specify the alignment required for
+ // spilling the register. Like SpillSize, this should only be explicitly
+ // specified if the register is not in a register class.
+ int SpillAlignment = 0;
+
+ // Aliases - A list of registers that this register overlaps with. A read or
+ // modification of this register can potentially read or modifie the aliased
+ // registers.
+ //
+ list<Register> Aliases = [];
+}
+
+// RegisterGroup - This can be used to define instances of Register which
+// need to specify aliases.
+// List "aliases" specifies which registers are aliased to this one. This
+// allows the code generator to be careful not to put two values with
+// overlapping live ranges into registers which alias.
+class RegisterGroup<string n, list<Register> aliases> : Register<n> {
+ let Aliases = aliases;
+}
+
+// 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> {
+ string Namespace = namespace;
+
+ // RegType - Specify the ValueType of the registers in this register class.
+ // Note that all registers in a register class must have the same ValueType.
+ //
+ list<ValueType> RegTypes = regTypes;
+
+ // Size - Specify the spill size in bits of the registers. A default value of
+ // zero lets tablgen pick an appropriate size.
+ int Size = 0;
+
+ // Alignment - Specify the alignment required of the registers when they are
+ // stored or loaded to memory.
+ //
+ int Alignment = alignment;
+
+ // MemberList - Specify which registers are in this class. If the
+ // allocation_order_* method are not specified, this also defines the order of
+ // allocation used by the register allocator.
+ //
+ list<Register> MemberList = regList;
+
+ // 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 = [{}];
}
+
+//===----------------------------------------------------------------------===//
+// Pull in the common support for scheduling
+//
+include "../TargetSchedule.td"
+
+
+//===----------------------------------------------------------------------===//
+// Instruction set description - These classes correspond to the C++ classes in
+// the Target/TargetInstrInfo.h file.
+//
class Instruction {
- string Name; // The opcode string for this instruction
+ string Name = ""; // The opcode string for this instruction
string Namespace = "";
- list<Register> Uses = []; // Default to using no non-operand registers
- list<Register> Defs = []; // Default to modifying no non-operand registers
+ dag OperandList; // An dag containing the MI operand list.
+ string AsmString = ""; // The .s format to print the instruction with.
+
+ // Pattern - Set to the DAG pattern for this instruction, if we know of one,
+ // otherwise, uninitialized.
+ list<dag> Pattern;
+
+ // The follow state will eventually be inferred automatically from the
+ // instruction pattern.
+
+ list<Register> Uses = []; // Default to using no non-operand registers
+ list<Register> Defs = []; // Default to modifying no non-operand registers
// These bits capture information about the high-level semantics of the
// instruction.
bit isReturn = 0; // Is this instruction a return instruction?
bit isBranch = 0; // Is this instruction a branch instruction?
+ bit isBarrier = 0; // Can control flow fall through this instruction?
bit isCall = 0; // Is this instruction a call instruction?
+ bit isLoad = 0; // Is this instruction a load instruction?
+ bit isStore = 0; // Is this instruction a store instruction?
bit isTwoAddress = 0; // Is this a two address instruction?
+ bit isConvertibleToThreeAddress = 0; // Can this 2-addr instruction promote?
+ bit isCommutable = 0; // Is this 3 operand instruction commutable?
bit isTerminator = 0; // Is this part of the terminator for a basic block?
+ bit hasDelaySlot = 0; // Does this instruction have an delay slot?
+ bit usesCustomDAGSchedInserter = 0; // Pseudo instr needing special help.
+
+ InstrItinClass Itinerary; // Execution steps used for scheduling.
}
+
+
+/// ops definition - This is just a simple marker used to identify the operands
+/// list for an instruction. This should be used like this:
+/// (ops R32:$dst, R32:$src) or something similar.
+def ops;
+
+/// variable_ops definition - Mark this instruction as taking a variable number
+/// of operands.
+def variable_ops;
+
+/// 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> {
+ ValueType Type = ty;
+ string PrintMethod = "printOperand";
+ int NumMIOperands = 1;
+ dag MIOperandInfo = (ops);
+}
+
+def i1imm : Operand<i1>;
+def i8imm : Operand<i8>;
+def i16imm : Operand<i16>;
+def i32imm : Operand<i32>;
+def i64imm : Operand<i64>;
+
+// InstrInfo - This class should only be instantiated once to provide parameters
+// which are global to the the target machine.
+//
+class InstrInfo {
+ Instruction PHIInst;
+
+ // If the target wants to associate some target-specific information with each
+ // instruction, it should provide these two lists to indicate how to assemble
+ // the target specific information into the 32 bits available.
+ //
+ list<string> TSFlagsFields = [];
+ list<int> TSFlagsShifts = [];
+
+ // Target can specify its instructions in either big or little-endian formats.
+ // For instance, while both Sparc and PowerPC are big-endian platforms, the
+ // Sparc manual specifies its instructions in the format [31..0] (big), while
+ // PowerPC specifies them using the format [0..31] (little).
+ bit isLittleEndianEncoding = 0;
+}
+
+//===----------------------------------------------------------------------===//
+// AsmWriter - This class can be implemented by targets that need to customize
+// the format of the .s file writer.
+//
+// Subtargets can have multiple different asmwriters (e.g. AT&T vs Intel syntax
+// on X86 for example).
+//
+class AsmWriter {
+ // AsmWriterClassName - This specifies the suffix to use for the asmwriter
+ // class. Generated AsmWriter classes are always prefixed with the target
+ // name.
+ string AsmWriterClassName = "AsmPrinter";
+
+ // InstFormatName - AsmWriters can specify the name of the format string to
+ // print instructions with.
+ string InstFormatName = "AsmString";
+
+ // Variant - AsmWriters can be of multiple different variants. Variants are
+ // used to support targets that need to emit assembly code in ways that are
+ // mostly the same for different targets, but have minor differences in
+ // syntax. If the asmstring contains {|} characters in them, this integer
+ // will specify which alternative to use. For example "{x|y|z}" with Variant
+ // == 1, will expand to "y".
+ int Variant = 0;
+}
+def DefaultAsmWriter : AsmWriter;
+
+
+//===----------------------------------------------------------------------===//
+// Target - This class contains the "global" target information
+//
+class Target {
+ // CalleeSavedRegisters - As you might guess, this is a list of the callee
+ // saved registers for a target.
+ list<Register> CalleeSavedRegisters = [];
+
+ // PointerType - Specify the value type to be used to represent pointers in
+ // this target. Typically this is an i32 or i64 type.
+ ValueType PointerType;
+
+ // InstructionSet - Instruction set description for this target.
+ InstrInfo InstructionSet;
+
+ // AssemblyWriters - The AsmWriter instances available for this target.
+ list<AsmWriter> AssemblyWriters = [DefaultAsmWriter];
+}
+
+//===----------------------------------------------------------------------===//
+// SubtargetFeature - A characteristic of the chip set.
+//
+class SubtargetFeature<string n, string t, string a, string d> {
+ // Name - Feature name. Used by command line (-mattr=) to determine the
+ // appropriate target chip.
+ //
+ string Name = n;
+
+ // Type - Type of attribute to be set by feature.
+ //
+ string Type = t;
+
+ // Attribute - Attribute to be set by feature.
+ //
+ string Attribute = a;
+
+ // Desc - Feature description. Used by command line (-mattr=) to display help
+ // information.
+ //
+ string Desc = d;
+}
+
+//===----------------------------------------------------------------------===//
+// Processor chip sets - These values represent each of the chip sets supported
+// by the scheduler. Each Processor definition requires corresponding
+// instruction itineraries.
+//
+class Processor<string n, ProcessorItineraries pi, list<SubtargetFeature> f> {
+ // Name - Chip set name. Used by command line (-mcpu=) to determine the
+ // appropriate target chip.
+ //
+ string Name = n;
+
+ // ProcItin - The scheduling information for the target processor.
+ //
+ ProcessorItineraries ProcItin = pi;
+
+ // Features - list of
+ list<SubtargetFeature> Features = f;
+}
+
+//===----------------------------------------------------------------------===//
+// Pull in the common support for DAG isel generation
+//
+include "../TargetSelectionDAG.td"