fields. This results in the ``XNORrr`` instruction binding ``$dst``, ``$b``,
and ``$c`` operands to the ``rd``, ``rs1``, and ``rs2`` fields respectively.
+Instruction Operand Name Mapping
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
TableGen will also generate a function called getNamedOperandIdx() which
can be used to look up an operand's index in a MachineInstr based on its
TableGen name. Setting the UseNamedOperandTable bit in an instruction's
int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIndex);
} // End namespace XXX
+Instruction Operand Types
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+TableGen will also generate an enumeration consisting of all named Operand
+types defined in the backend, in the llvm::XXX::OpTypes namespace.
+Some common immediate Operand types (for instance i8, i32, i64, f32, f64)
+are defined for all targets in ``include/llvm/Target/Target.td``, and are
+available in each Target's OpTypes enum. Also, only named Operand types appear
+in the enumeration: anonymous types are ignored.
+For example, the X86 backend defines ``brtarget`` and ``brtarget8``, both
+instances of the TableGen ``Operand`` class, which represent branch target
+operands:
+
+.. code-block:: llvm
+
+ def brtarget : Operand<OtherVT>;
+ def brtarget8 : Operand<OtherVT>;
+
+This results in:
+
+.. code-block:: c++
+ namespace X86 {
+ namespace OpTypes {
+ enum OperandType {
+ ...
+ brtarget,
+ brtarget8,
+ ...
+ i32imm,
+ i64imm,
+ ...
+ OPERAND_TYPE_LIST_END
+ } // End namespace OpTypes
+ } // End namespace X86
+
+In typical TableGen fashion, to use the enum, you will need to define a
+preprocessor macro:
+
+.. code-block:: c++
+
+ #define GET_INSTRINFO_OPERAND_TYPES_ENUM // For OpTypes enum
+ #include "XXXGenInstrInfo.inc"
+
+
+Instruction Scheduling
+----------------------
+
+Instruction itineraries can be queried using MCDesc::getSchedClass(). The
+value can be named by an enumemation in llvm::XXX::Sched namespace generated
+by TableGen in XXXGenInstrInfo.inc. The name of the schedule classes are
+the same as provided in XXXSchedule.td plus a default NoItinerary class.
+
Instruction Relation Mapping
----------------------------