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| -rw-r--r-- | docs/WritingAnLLVMBackend.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/WritingAnLLVMBackend.rst b/docs/WritingAnLLVMBackend.rst index 0d29210f9a..5dd55d08ad 100644 --- a/docs/WritingAnLLVMBackend.rst +++ b/docs/WritingAnLLVMBackend.rst @@ -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 |