forked from OSchip/llvm-project
132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
//===-- MSP430ISelDAGToDAG.cpp - A dag to dag inst selector for MSP430 ----===//
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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 an instruction selector for the MSP430 target.
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//
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//===----------------------------------------------------------------------===//
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#include "MSP430.h"
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#include "MSP430ISelLowering.h"
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#include "MSP430TargetMachine.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Constants.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include <queue>
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#include <set>
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using namespace llvm;
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/// MSP430DAGToDAGISel - MSP430 specific code to select MSP430 machine
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/// instructions for SelectionDAG operations.
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///
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namespace {
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class MSP430DAGToDAGISel : public SelectionDAGISel {
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MSP430TargetLowering &Lowering;
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const MSP430Subtarget &Subtarget;
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public:
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MSP430DAGToDAGISel(MSP430TargetMachine &TM)
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: SelectionDAGISel(TM),
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Lowering(*TM.getTargetLowering()),
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Subtarget(*TM.getSubtargetImpl()) { }
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virtual void InstructionSelect();
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virtual const char *getPassName() const {
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return "MSP430 DAG->DAG Pattern Instruction Selection";
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}
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// Include the pieces autogenerated from the target description.
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#include "MSP430GenDAGISel.inc"
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private:
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SDNode *Select(SDValue Op);
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#ifndef NDEBUG
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unsigned Indent;
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#endif
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};
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} // end anonymous namespace
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/// createMSP430ISelDag - This pass converts a legalized DAG into a
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/// MSP430-specific DAG, ready for instruction scheduling.
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///
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FunctionPass *llvm::createMSP430ISelDag(MSP430TargetMachine &TM) {
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return new MSP430DAGToDAGISel(TM);
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}
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/// InstructionSelect - This callback is invoked by
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/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
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void MSP430DAGToDAGISel::InstructionSelect() {
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DEBUG(BB->dump());
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// Select target instructions for the DAG.
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SelectRoot(*CurDAG);
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CurDAG->RemoveDeadNodes();
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}
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SDNode *MSP430DAGToDAGISel::Select(SDValue Op) {
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SDNode *Node = Op.getNode();
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// Dump information about the Node being selected
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#ifndef NDEBUG
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DOUT << std::string(Indent, ' ') << "Selecting: ";
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DEBUG(Node->dump(CurDAG));
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DOUT << "\n";
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Indent += 2;
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#endif
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// If we have a custom node, we already have selected!
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if (Node->isMachineOpcode()) {
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#ifndef NDEBUG
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DOUT << std::string(Indent-2, ' ') << "== ";
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DEBUG(Node->dump(CurDAG));
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DOUT << "\n";
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Indent -= 2;
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#endif
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return NULL;
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}
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// Instruction Selection not handled by the auto-generated tablegen selection
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// should be handled here.
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// Something like this:
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// unsigned Opcode = Node->getOpcode();
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// switch (Opcode) {
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// default: break;
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// case ISD::Foo:
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// return SelectFoo(Node)
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// }
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// Select the default instruction
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SDNode *ResNode = SelectCode(Op);
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#ifndef NDEBUG
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DOUT << std::string(Indent-2, ' ') << "=> ";
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if (ResNode == NULL || ResNode == Op.getNode())
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DEBUG(Op.getNode()->dump(CurDAG));
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else
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DEBUG(ResNode->dump(CurDAG));
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DOUT << "\n";
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Indent -= 2;
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#endif
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return ResNode;
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}
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