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Docs: Clearly separate Operand-related paragraphs.

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llvm-svn: 194977
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Ahmed Bougacha 2013-11-17 21:24:37 +00:00
parent d5bc579e67
commit 461887f4d3
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docs/WritingAnLLVMBackend.rst
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@ -911,6 +911,9 @@ format instructions will bind the operands to the ``rd``, ``rs1``, and ``rs2``
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
@ -952,6 +955,9 @@ XXXInstrInfo.h:
int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIndex);
} // End namespace XXX
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