From 0df7f51365f582afd755a832ea23a0b720f615b7 Mon Sep 17 00:00:00 2001 From: Ahmed Bougacha Date: Sun, 17 Nov 2013 21:24:37 +0000 Subject: Docs: Clearly separate Operand-related paragraphs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194977 91177308-0d34-0410-b5e6-96231b3b80d8 --- docs/WritingAnLLVMBackend.rst | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'docs') diff --git a/docs/WritingAnLLVMBackend.rst b/docs/WritingAnLLVMBackend.rst index 0d29210..5dd55d0 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 -- cgit v1.1