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876 lines
34 KiB
TableGen
876 lines
34 KiB
TableGen
//===- Target.td - Target Independent TableGen interface ---*- tablegen -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the target-independent interfaces which should be
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// implemented by each target which is using a TableGen based code generator.
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//
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//===----------------------------------------------------------------------===//
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// Include all information about LLVM intrinsics.
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include "llvm/Intrinsics.td"
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//===----------------------------------------------------------------------===//
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// Register file description - These classes are used to fill in the target
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// description classes.
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class RegisterClass; // Forward def
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// SubRegIndex - Use instances of SubRegIndex to identify subregisters.
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class SubRegIndex {
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string Namespace = "";
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}
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// RegAltNameIndex - The alternate name set to use for register operands of
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// this register class when printing.
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class RegAltNameIndex {
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string Namespace = "";
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}
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def NoRegAltName : RegAltNameIndex;
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// Register - You should define one instance of this class for each register
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// in the target machine. String n will become the "name" of the register.
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class Register<string n, list<string> altNames = []> {
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string Namespace = "";
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string AsmName = n;
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list<string> AltNames = altNames;
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// Aliases - A list of registers that this register overlaps with. A read or
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// modification of this register can potentially read or modify the aliased
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// registers.
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list<Register> Aliases = [];
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// SubRegs - A list of registers that are parts of this register. Note these
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// are "immediate" sub-registers and the registers within the list do not
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// themselves overlap. e.g. For X86, EAX's SubRegs list contains only [AX],
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// not [AX, AH, AL].
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list<Register> SubRegs = [];
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// SubRegIndices - For each register in SubRegs, specify the SubRegIndex used
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// to address it. Sub-sub-register indices are automatically inherited from
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// SubRegs.
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list<SubRegIndex> SubRegIndices = [];
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// RegAltNameIndices - The alternate name indices which are valid for this
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// register.
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list<RegAltNameIndex> RegAltNameIndices = [];
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// CompositeIndices - Specify subreg indices that don't correspond directly to
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// a register in SubRegs and are not inherited. The following formats are
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// supported:
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//
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// (a) Identity - Reg:a == Reg
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// (a b) Alias - Reg:a == Reg:b
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// (a b,c) Composite - Reg:a == (Reg:b):c
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//
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// This can be used to disambiguate a sub-sub-register that exists in more
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// than one subregister and other weird stuff.
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list<dag> CompositeIndices = [];
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// DwarfNumbers - Numbers used internally by gcc/gdb to identify the register.
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// These values can be determined by locating the <target>.h file in the
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// directory llvmgcc/gcc/config/<target>/ and looking for REGISTER_NAMES. The
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// order of these names correspond to the enumeration used by gcc. A value of
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// -1 indicates that the gcc number is undefined and -2 that register number
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// is invalid for this mode/flavour.
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list<int> DwarfNumbers = [];
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// CostPerUse - Additional cost of instructions using this register compared
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// to other registers in its class. The register allocator will try to
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// minimize the number of instructions using a register with a CostPerUse.
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// This is used by the x86-64 and ARM Thumb targets where some registers
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// require larger instruction encodings.
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int CostPerUse = 0;
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}
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// RegisterWithSubRegs - This can be used to define instances of Register which
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// need to specify sub-registers.
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// List "subregs" specifies which registers are sub-registers to this one. This
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// is used to populate the SubRegs and AliasSet fields of TargetRegisterDesc.
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// This allows the code generator to be careful not to put two values with
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// overlapping live ranges into registers which alias.
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class RegisterWithSubRegs<string n, list<Register> subregs> : Register<n> {
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let SubRegs = subregs;
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}
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// RegisterClass - Now that all of the registers are defined, and aliases
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// between registers are defined, specify which registers belong to which
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// register classes. This also defines the default allocation order of
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// registers by register allocators.
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//
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class RegisterClass<string namespace, list<ValueType> regTypes, int alignment,
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dag regList, RegAltNameIndex idx = NoRegAltName> {
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string Namespace = namespace;
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// RegType - Specify the list ValueType of the registers in this register
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// class. Note that all registers in a register class must have the same
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// ValueTypes. This is a list because some targets permit storing different
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// types in same register, for example vector values with 128-bit total size,
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// but different count/size of items, like SSE on x86.
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//
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list<ValueType> RegTypes = regTypes;
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// Size - Specify the spill size in bits of the registers. A default value of
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// zero lets tablgen pick an appropriate size.
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int Size = 0;
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// Alignment - Specify the alignment required of the registers when they are
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// stored or loaded to memory.
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//
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int Alignment = alignment;
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// CopyCost - This value is used to specify the cost of copying a value
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// between two registers in this register class. The default value is one
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// meaning it takes a single instruction to perform the copying. A negative
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// value means copying is extremely expensive or impossible.
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int CopyCost = 1;
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// MemberList - Specify which registers are in this class. If the
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// allocation_order_* method are not specified, this also defines the order of
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// allocation used by the register allocator.
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//
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dag MemberList = regList;
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// AltNameIndex - The alternate register name to use when printing operands
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// of this register class. Every register in the register class must have
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// a valid alternate name for the given index.
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RegAltNameIndex altNameIndex = idx;
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// SubRegClasses - Specify the register class of subregisters as a list of
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// dags: (RegClass SubRegIndex, SubRegindex, ...)
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list<dag> SubRegClasses = [];
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// isAllocatable - Specify that the register class can be used for virtual
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// registers and register allocation. Some register classes are only used to
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// model instruction operand constraints, and should have isAllocatable = 0.
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bit isAllocatable = 1;
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// AltOrders - List of alternative allocation orders. The default order is
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// MemberList itself, and that is good enough for most targets since the
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// register allocators automatically remove reserved registers and move
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// callee-saved registers to the end.
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list<dag> AltOrders = [];
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// AltOrderSelect - The body of a function that selects the allocation order
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// to use in a given machine function. The code will be inserted in a
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// function like this:
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//
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// static inline unsigned f(const MachineFunction &MF) { ... }
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//
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// The function should return 0 to select the default order defined by
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// MemberList, 1 to select the first AltOrders entry and so on.
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code AltOrderSelect = [{}];
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}
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// The memberList in a RegisterClass is a dag of set operations. TableGen
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// evaluates these set operations and expand them into register lists. These
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// are the most common operation, see test/TableGen/SetTheory.td for more
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// examples of what is possible:
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//
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// (add R0, R1, R2) - Set Union. Each argument can be an individual register, a
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// register class, or a sub-expression. This is also the way to simply list
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// registers.
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//
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// (sub GPR, SP) - Set difference. Subtract the last arguments from the first.
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//
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// (and GPR, CSR) - Set intersection. All registers from the first set that are
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// also in the second set.
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//
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// (sequence "R%u", 0, 15) -> [R0, R1, ..., R15]. Generate a sequence of
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// numbered registers.
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//
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// (shl GPR, 4) - Remove the first N elements.
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//
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// (trunc GPR, 4) - Truncate after the first N elements.
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//
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// (rotl GPR, 1) - Rotate N places to the left.
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//
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// (rotr GPR, 1) - Rotate N places to the right.
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//
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// (decimate GPR, 2) - Pick every N'th element, starting with the first.
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//
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// All of these operators work on ordered sets, not lists. That means
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// duplicates are removed from sub-expressions.
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// Set operators. The rest is defined in TargetSelectionDAG.td.
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def sequence;
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def decimate;
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// RegisterTuples - Automatically generate super-registers by forming tuples of
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// sub-registers. This is useful for modeling register sequence constraints
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// with pseudo-registers that are larger than the architectural registers.
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//
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// The sub-register lists are zipped together:
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//
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// def EvenOdd : RegisterTuples<[sube, subo], [(add R0, R2), (add R1, R3)]>;
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//
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// Generates the same registers as:
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//
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// let SubRegIndices = [sube, subo] in {
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// def R0_R1 : RegisterWithSubRegs<"", [R0, R1]>;
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// def R2_R3 : RegisterWithSubRegs<"", [R2, R3]>;
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// }
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//
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// The generated pseudo-registers inherit super-classes and fields from their
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// first sub-register. Most fields from the Register class are inferred, and
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// the AsmName and Dwarf numbers are cleared.
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//
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// RegisterTuples instances can be used in other set operations to form
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// register classes and so on. This is the only way of using the generated
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// registers.
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class RegisterTuples<list<SubRegIndex> Indices, list<dag> Regs> {
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// SubRegs - N lists of registers to be zipped up. Super-registers are
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// synthesized from the first element of each SubRegs list, the second
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// element and so on.
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list<dag> SubRegs = Regs;
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// SubRegIndices - N SubRegIndex instances. This provides the names of the
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// sub-registers in the synthesized super-registers.
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list<SubRegIndex> SubRegIndices = Indices;
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// Compose sub-register indices like in a normal Register.
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list<dag> CompositeIndices = [];
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}
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//===----------------------------------------------------------------------===//
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// DwarfRegNum - This class provides a mapping of the llvm register enumeration
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// to the register numbering used by gcc and gdb. These values are used by a
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// debug information writer to describe where values may be located during
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// execution.
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class DwarfRegNum<list<int> Numbers> {
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// DwarfNumbers - Numbers used internally by gcc/gdb to identify the register.
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// These values can be determined by locating the <target>.h file in the
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// directory llvmgcc/gcc/config/<target>/ and looking for REGISTER_NAMES. The
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// order of these names correspond to the enumeration used by gcc. A value of
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// -1 indicates that the gcc number is undefined and -2 that register number
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// is invalid for this mode/flavour.
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list<int> DwarfNumbers = Numbers;
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}
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// DwarfRegAlias - This class declares that a given register uses the same dwarf
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// numbers as another one. This is useful for making it clear that the two
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// registers do have the same number. It also lets us build a mapping
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// from dwarf register number to llvm register.
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class DwarfRegAlias<Register reg> {
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Register DwarfAlias = reg;
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}
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//===----------------------------------------------------------------------===//
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// Pull in the common support for scheduling
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//
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include "llvm/Target/TargetSchedule.td"
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class Predicate; // Forward def
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//===----------------------------------------------------------------------===//
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// Instruction set description - These classes correspond to the C++ classes in
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// the Target/TargetInstrInfo.h file.
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//
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class Instruction {
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string Namespace = "";
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dag OutOperandList; // An dag containing the MI def operand list.
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dag InOperandList; // An dag containing the MI use operand list.
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string AsmString = ""; // The .s format to print the instruction with.
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// Pattern - Set to the DAG pattern for this instruction, if we know of one,
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// otherwise, uninitialized.
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list<dag> Pattern;
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// The follow state will eventually be inferred automatically from the
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// instruction pattern.
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list<Register> Uses = []; // Default to using no non-operand registers
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list<Register> Defs = []; // Default to modifying no non-operand registers
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// Predicates - List of predicates which will be turned into isel matching
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// code.
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list<Predicate> Predicates = [];
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// Size - Size of encoded instruction, or zero if the size cannot be determined
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// from the opcode.
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int Size = 0;
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// DecoderNamespace - The "namespace" in which this instruction exists, on
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// targets like ARM which multiple ISA namespaces exist.
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string DecoderNamespace = "";
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// Code size, for instruction selection.
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// FIXME: What does this actually mean?
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int CodeSize = 0;
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// Added complexity passed onto matching pattern.
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int AddedComplexity = 0;
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// These bits capture information about the high-level semantics of the
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// instruction.
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bit isReturn = 0; // Is this instruction a return instruction?
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bit isBranch = 0; // Is this instruction a branch instruction?
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bit isIndirectBranch = 0; // Is this instruction an indirect branch?
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bit isCompare = 0; // Is this instruction a comparison instruction?
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bit isMoveImm = 0; // Is this instruction a move immediate instruction?
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bit isBitcast = 0; // Is this instruction a bitcast instruction?
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bit isBarrier = 0; // Can control flow fall through this instruction?
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bit isCall = 0; // Is this instruction a call instruction?
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bit canFoldAsLoad = 0; // Can this be folded as a simple memory operand?
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bit mayLoad = 0; // Is it possible for this inst to read memory?
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bit mayStore = 0; // Is it possible for this inst to write memory?
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bit isConvertibleToThreeAddress = 0; // Can this 2-addr instruction promote?
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bit isCommutable = 0; // Is this 3 operand instruction commutable?
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bit isTerminator = 0; // Is this part of the terminator for a basic block?
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bit isReMaterializable = 0; // Is this instruction re-materializable?
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bit isPredicable = 0; // Is this instruction predicable?
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bit hasDelaySlot = 0; // Does this instruction have an delay slot?
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bit usesCustomInserter = 0; // Pseudo instr needing special help.
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bit hasCtrlDep = 0; // Does this instruction r/w ctrl-flow chains?
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bit isNotDuplicable = 0; // Is it unsafe to duplicate this instruction?
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bit isAsCheapAsAMove = 0; // As cheap (or cheaper) than a move instruction.
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bit hasExtraSrcRegAllocReq = 0; // Sources have special regalloc requirement?
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bit hasExtraDefRegAllocReq = 0; // Defs have special regalloc requirement?
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bit isPseudo = 0; // Is this instruction a pseudo-instruction?
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// If so, won't have encoding information for
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// the [MC]CodeEmitter stuff.
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// Side effect flags - When set, the flags have these meanings:
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//
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// hasSideEffects - The instruction has side effects that are not
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// captured by any operands of the instruction or other flags.
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//
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// neverHasSideEffects - Set on an instruction with no pattern if it has no
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// side effects.
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bit hasSideEffects = 0;
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bit neverHasSideEffects = 0;
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// Is this instruction a "real" instruction (with a distinct machine
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// encoding), or is it a pseudo instruction used for codegen modeling
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// purposes.
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// FIXME: For now this is distinct from isPseudo, above, as code-gen-only
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// instructions can (and often do) still have encoding information
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// associated with them. Once we've migrated all of them over to true
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// pseudo-instructions that are lowered to real instructions prior to
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// the printer/emitter, we can remove this attribute and just use isPseudo.
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bit isCodeGenOnly = 0;
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// Is this instruction a pseudo instruction for use by the assembler parser.
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bit isAsmParserOnly = 0;
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InstrItinClass Itinerary = NoItinerary;// Execution steps used for scheduling.
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string Constraints = ""; // OperandConstraint, e.g. $src = $dst.
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/// DisableEncoding - List of operand names (e.g. "$op1,$op2") that should not
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/// be encoded into the output machineinstr.
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string DisableEncoding = "";
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string PostEncoderMethod = "";
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string DecoderMethod = "";
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/// Target-specific flags. This becomes the TSFlags field in TargetInstrDesc.
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bits<64> TSFlags = 0;
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///@name Assembler Parser Support
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///@{
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string AsmMatchConverter = "";
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///@}
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}
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/// PseudoInstExpansion - Expansion information for a pseudo-instruction.
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/// Which instruction it expands to and how the operands map from the
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/// pseudo.
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class PseudoInstExpansion<dag Result> {
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dag ResultInst = Result; // The instruction to generate.
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bit isPseudo = 1;
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}
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/// Predicates - These are extra conditionals which are turned into instruction
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/// selector matching code. Currently each predicate is just a string.
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class Predicate<string cond> {
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string CondString = cond;
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/// AssemblerMatcherPredicate - If this feature can be used by the assembler
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/// matcher, this is true. Targets should set this by inheriting their
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/// feature from the AssemblerPredicate class in addition to Predicate.
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bit AssemblerMatcherPredicate = 0;
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/// AssemblerCondString - Name of the subtarget feature being tested used
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/// as alternative condition string used for assembler matcher.
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/// e.g. "ModeThumb" is translated to "(Bits & ModeThumb) != 0".
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/// "!ModeThumb" is translated to "(Bits & ModeThumb) == 0".
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/// It can also list multiple features separated by ",".
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/// e.g. "ModeThumb,FeatureThumb2" is translated to
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/// "(Bits & ModeThumb) != 0 && (Bits & FeatureThumb2) != 0".
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string AssemblerCondString = "";
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}
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/// NoHonorSignDependentRounding - This predicate is true if support for
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/// sign-dependent-rounding is not enabled.
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def NoHonorSignDependentRounding
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: Predicate<"!HonorSignDependentRoundingFPMath()">;
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class Requires<list<Predicate> preds> {
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list<Predicate> Predicates = preds;
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}
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/// ops definition - This is just a simple marker used to identify the operand
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/// list for an instruction. outs and ins are identical both syntactically and
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/// semanticallyr; they are used to define def operands and use operands to
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/// improve readibility. This should be used like this:
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/// (outs R32:$dst), (ins R32:$src1, R32:$src2) or something similar.
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def ops;
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def outs;
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def ins;
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/// variable_ops definition - Mark this instruction as taking a variable number
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/// of operands.
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def variable_ops;
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/// PointerLikeRegClass - Values that are designed to have pointer width are
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/// derived from this. TableGen treats the register class as having a symbolic
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/// type that it doesn't know, and resolves the actual regclass to use by using
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/// the TargetRegisterInfo::getPointerRegClass() hook at codegen time.
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class PointerLikeRegClass<int Kind> {
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int RegClassKind = Kind;
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}
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/// ptr_rc definition - Mark this operand as being a pointer value whose
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/// register class is resolved dynamically via a callback to TargetInstrInfo.
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/// FIXME: We should probably change this to a class which contain a list of
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/// flags. But currently we have but one flag.
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def ptr_rc : PointerLikeRegClass<0>;
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/// unknown definition - Mark this operand as being of unknown type, causing
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/// it to be resolved by inference in the context it is used.
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def unknown;
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/// AsmOperandClass - Representation for the kinds of operands which the target
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/// specific parser can create and the assembly matcher may need to distinguish.
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///
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/// Operand classes are used to define the order in which instructions are
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/// matched, to ensure that the instruction which gets matched for any
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/// particular list of operands is deterministic.
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///
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/// The target specific parser must be able to classify a parsed operand into a
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/// unique class which does not partially overlap with any other classes. It can
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/// match a subset of some other class, in which case the super class field
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/// should be defined.
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class AsmOperandClass {
|
|
/// The name to use for this class, which should be usable as an enum value.
|
|
string Name = ?;
|
|
|
|
/// The super classes of this operand.
|
|
list<AsmOperandClass> SuperClasses = [];
|
|
|
|
/// The name of the method on the target specific operand to call to test
|
|
/// whether the operand is an instance of this class. If not set, this will
|
|
/// default to "isFoo", where Foo is the AsmOperandClass name. The method
|
|
/// signature should be:
|
|
/// bool isFoo() const;
|
|
string PredicateMethod = ?;
|
|
|
|
/// The name of the method on the target specific operand to call to add the
|
|
/// target specific operand to an MCInst. If not set, this will default to
|
|
/// "addFooOperands", where Foo is the AsmOperandClass name. The method
|
|
/// signature should be:
|
|
/// void addFooOperands(MCInst &Inst, unsigned N) const;
|
|
string RenderMethod = ?;
|
|
|
|
/// The name of the method on the target specific operand to call to custom
|
|
/// handle the operand parsing. This is useful when the operands do not relate
|
|
/// to immediates or registers and are very instruction specific (as flags to
|
|
/// set in a processor register, coprocessor number, ...).
|
|
string ParserMethod = ?;
|
|
}
|
|
|
|
def ImmAsmOperand : AsmOperandClass {
|
|
let Name = "Imm";
|
|
}
|
|
|
|
/// 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";
|
|
string EncoderMethod = "";
|
|
string DecoderMethod = "";
|
|
string AsmOperandLowerMethod = ?;
|
|
string OperandType = "OPERAND_UNKNOWN";
|
|
dag MIOperandInfo = (ops);
|
|
|
|
// 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 = 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 i32imm : Operand<i32>;
|
|
def i64imm : Operand<i64>;
|
|
|
|
def f32imm : Operand<f32>;
|
|
def f64imm : Operand<f64>;
|
|
}
|
|
|
|
/// zero_reg definition - Special node to stand for the zero register.
|
|
///
|
|
def zero_reg;
|
|
|
|
/// PredicateOperand - This can be used to define a predicate operand for an
|
|
/// instruction. OpTypes specifies the MIOperandInfo for the operand, and
|
|
/// AlwaysVal specifies the value of this predicate when set to "always
|
|
/// execute".
|
|
class PredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
|
|
: Operand<ty> {
|
|
let MIOperandInfo = OpTypes;
|
|
dag DefaultOps = AlwaysVal;
|
|
}
|
|
|
|
/// OptionalDefOperand - This is used to define a optional definition operand
|
|
/// for an instruction. DefaultOps is the register the operand represents if
|
|
/// none is supplied, e.g. zero_reg.
|
|
class OptionalDefOperand<ValueType ty, dag OpTypes, dag defaultops>
|
|
: Operand<ty> {
|
|
let MIOperandInfo = OpTypes;
|
|
dag DefaultOps = defaultops;
|
|
}
|
|
|
|
|
|
// InstrInfo - This class should only be instantiated once to provide parameters
|
|
// which are global to the target machine.
|
|
//
|
|
class InstrInfo {
|
|
// 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;
|
|
}
|
|
|
|
// 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 {
|
|
def PHI : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins variable_ops);
|
|
let AsmString = "PHINODE";
|
|
}
|
|
def INLINEASM : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins variable_ops);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1; // Note side effect is encoded in an operand.
|
|
}
|
|
def PROLOG_LABEL : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins i32imm:$id);
|
|
let AsmString = "";
|
|
let hasCtrlDep = 1;
|
|
let isNotDuplicable = 1;
|
|
}
|
|
def EH_LABEL : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins i32imm:$id);
|
|
let AsmString = "";
|
|
let hasCtrlDep = 1;
|
|
let isNotDuplicable = 1;
|
|
}
|
|
def GC_LABEL : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins i32imm:$id);
|
|
let AsmString = "";
|
|
let hasCtrlDep = 1;
|
|
let isNotDuplicable = 1;
|
|
}
|
|
def KILL : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins variable_ops);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
}
|
|
def EXTRACT_SUBREG : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins unknown:$supersrc, i32imm:$subidx);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
}
|
|
def INSERT_SUBREG : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins unknown:$supersrc, unknown:$subsrc, i32imm:$subidx);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
let Constraints = "$supersrc = $dst";
|
|
}
|
|
def IMPLICIT_DEF : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
let isReMaterializable = 1;
|
|
let isAsCheapAsAMove = 1;
|
|
}
|
|
def SUBREG_TO_REG : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins unknown:$implsrc, unknown:$subsrc, i32imm:$subidx);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
}
|
|
def COPY_TO_REGCLASS : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins unknown:$src, i32imm:$regclass);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
let isAsCheapAsAMove = 1;
|
|
}
|
|
def DBG_VALUE : Instruction {
|
|
let OutOperandList = (outs);
|
|
let InOperandList = (ins variable_ops);
|
|
let AsmString = "DBG_VALUE";
|
|
let neverHasSideEffects = 1;
|
|
}
|
|
def REG_SEQUENCE : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins variable_ops);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
let isAsCheapAsAMove = 1;
|
|
}
|
|
def COPY : Instruction {
|
|
let OutOperandList = (outs unknown:$dst);
|
|
let InOperandList = (ins unknown:$src);
|
|
let AsmString = "";
|
|
let neverHasSideEffects = 1;
|
|
let isAsCheapAsAMove = 1;
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// AsmParser - This class can be implemented by targets that wish to implement
|
|
// .s file parsing.
|
|
//
|
|
// Subtargets can have multiple different assembly parsers (e.g. AT&T vs Intel
|
|
// syntax on X86 for example).
|
|
//
|
|
class AsmParser {
|
|
// AsmParserClassName - This specifies the suffix to use for the asmparser
|
|
// class. Generated AsmParser classes are always prefixed with the target
|
|
// name.
|
|
string AsmParserClassName = "AsmParser";
|
|
|
|
// AsmParserInstCleanup - If non-empty, this is the name of a custom member
|
|
// function of the AsmParser class to call on every matched instruction.
|
|
// This can be used to perform target specific instruction post-processing.
|
|
string AsmParserInstCleanup = "";
|
|
|
|
// Variant - AsmParsers can be of multiple different variants. Variants are
|
|
// used to support targets that need to parser multiple formats for the
|
|
// assembly language.
|
|
int Variant = 0;
|
|
|
|
// CommentDelimiter - If given, the delimiter string used to recognize
|
|
// comments which are hard coded in the .td assembler strings for individual
|
|
// instructions.
|
|
string CommentDelimiter = "";
|
|
|
|
// RegisterPrefix - If given, the token prefix which indicates a register
|
|
// token. This is used by the matcher to automatically recognize hard coded
|
|
// register tokens as constrained registers, instead of tokens, for the
|
|
// purposes of matching.
|
|
string RegisterPrefix = "";
|
|
}
|
|
def DefaultAsmParser : AsmParser;
|
|
|
|
/// AssemblerPredicate - This is a Predicate that can be used when the assembler
|
|
/// matches instructions and aliases.
|
|
class AssemblerPredicate<string cond> {
|
|
bit AssemblerMatcherPredicate = 1;
|
|
string AssemblerCondString = cond;
|
|
}
|
|
|
|
|
|
|
|
/// MnemonicAlias - This class allows targets to define assembler mnemonic
|
|
/// aliases. This should be used when all forms of one mnemonic are accepted
|
|
/// with a different mnemonic. For example, X86 allows:
|
|
/// sal %al, 1 -> shl %al, 1
|
|
/// sal %ax, %cl -> shl %ax, %cl
|
|
/// sal %eax, %cl -> shl %eax, %cl
|
|
/// etc. Though "sal" is accepted with many forms, all of them are directly
|
|
/// translated to a shl, so it can be handled with (in the case of X86, it
|
|
/// actually has one for each suffix as well):
|
|
/// def : MnemonicAlias<"sal", "shl">;
|
|
///
|
|
/// Mnemonic aliases are mapped before any other translation in the match phase,
|
|
/// and do allow Requires predicates, e.g.:
|
|
///
|
|
/// def : MnemonicAlias<"pushf", "pushfq">, Requires<[In64BitMode]>;
|
|
/// def : MnemonicAlias<"pushf", "pushfl">, Requires<[In32BitMode]>;
|
|
///
|
|
class MnemonicAlias<string From, string To> {
|
|
string FromMnemonic = From;
|
|
string ToMnemonic = To;
|
|
|
|
// Predicates - Predicates that must be true for this remapping to happen.
|
|
list<Predicate> Predicates = [];
|
|
}
|
|
|
|
/// InstAlias - This defines an alternate assembly syntax that is allowed to
|
|
/// match an instruction that has a different (more canonical) assembly
|
|
/// representation.
|
|
class InstAlias<string Asm, dag Result, bit Emit = 0b1> {
|
|
string AsmString = Asm; // The .s format to match the instruction with.
|
|
dag ResultInst = Result; // The MCInst to generate.
|
|
bit EmitAlias = Emit; // Emit the alias instead of what's aliased.
|
|
|
|
// Predicates - Predicates that must be true for this to match.
|
|
list<Predicate> Predicates = [];
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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";
|
|
|
|
// 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;
|
|
|
|
|
|
// FirstOperandColumn/OperandSpacing - If the assembler syntax uses a columnar
|
|
// layout, the asmwriter can actually generate output in this columns (in
|
|
// verbose-asm mode). These two values indicate the width of the first column
|
|
// (the "opcode" area) and the width to reserve for subsequent operands. When
|
|
// verbose asm mode is enabled, operands will be indented to respect this.
|
|
int FirstOperandColumn = -1;
|
|
|
|
// OperandSpacing - Space between operand columns.
|
|
int OperandSpacing = -1;
|
|
|
|
// isMCAsmWriter - Is this assembly writer for an MC emitter? This controls
|
|
// generation of the printInstruction() method. For MC printers, it takes
|
|
// an MCInstr* operand, otherwise it takes a MachineInstr*.
|
|
bit isMCAsmWriter = 0;
|
|
}
|
|
def DefaultAsmWriter : AsmWriter;
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Target - This class contains the "global" target information
|
|
//
|
|
class Target {
|
|
// InstructionSet - Instruction set description for this target.
|
|
InstrInfo InstructionSet;
|
|
|
|
// AssemblyParsers - The AsmParser instances available for this target.
|
|
list<AsmParser> AssemblyParsers = [DefaultAsmParser];
|
|
|
|
// AssemblyWriters - The AsmWriter instances available for this target.
|
|
list<AsmWriter> AssemblyWriters = [DefaultAsmWriter];
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// SubtargetFeature - A characteristic of the chip set.
|
|
//
|
|
class SubtargetFeature<string n, string a, string v, string d,
|
|
list<SubtargetFeature> i = []> {
|
|
// Name - Feature name. Used by command line (-mattr=) to determine the
|
|
// appropriate target chip.
|
|
//
|
|
string Name = n;
|
|
|
|
// Attribute - Attribute to be set by feature.
|
|
//
|
|
string Attribute = a;
|
|
|
|
// Value - Value the attribute to be set to by feature.
|
|
//
|
|
string Value = v;
|
|
|
|
// Desc - Feature description. Used by command line (-mattr=) to display help
|
|
// information.
|
|
//
|
|
string Desc = d;
|
|
|
|
// Implies - Features that this feature implies are present. If one of those
|
|
// features isn't set, then this one shouldn't be set either.
|
|
//
|
|
list<SubtargetFeature> Implies = i;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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 calling conventions.
|
|
//
|
|
include "llvm/Target/TargetCallingConv.td"
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Pull in the common support for DAG isel generation.
|
|
//
|
|
include "llvm/Target/TargetSelectionDAG.td"
|