| //===-- MSP430ISelDAGToDAG.cpp - A dag to dag inst selector for MSP430 ----===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines an instruction selector for the MSP430 target. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MSP430.h" |
| #include "MSP430ISelLowering.h" |
| #include "MSP430TargetMachine.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Function.h" |
| #include "llvm/Intrinsics.h" |
| #include "llvm/CallingConv.h" |
| #include "llvm/Constants.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/SelectionDAG.h" |
| #include "llvm/CodeGen/SelectionDAGISel.h" |
| #include "llvm/Target/TargetLowering.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| /// MSP430DAGToDAGISel - MSP430 specific code to select MSP430 machine |
| /// instructions for SelectionDAG operations. |
| /// |
| namespace { |
| class MSP430DAGToDAGISel : public SelectionDAGISel { |
| MSP430TargetLowering &Lowering; |
| const MSP430Subtarget &Subtarget; |
| |
| public: |
| MSP430DAGToDAGISel(MSP430TargetMachine &TM, CodeGenOpt::Level OptLevel) |
| : SelectionDAGISel(TM, OptLevel), |
| Lowering(*TM.getTargetLowering()), |
| Subtarget(*TM.getSubtargetImpl()) { } |
| |
| virtual void InstructionSelect(); |
| |
| virtual const char *getPassName() const { |
| return "MSP430 DAG->DAG Pattern Instruction Selection"; |
| } |
| |
| // Include the pieces autogenerated from the target description. |
| #include "MSP430GenDAGISel.inc" |
| |
| private: |
| SDNode *Select(SDValue Op); |
| bool SelectAddr(SDValue Op, SDValue Addr, SDValue &Base, SDValue &Disp); |
| |
| #ifndef NDEBUG |
| unsigned Indent; |
| #endif |
| }; |
| } // end anonymous namespace |
| |
| /// createMSP430ISelDag - This pass converts a legalized DAG into a |
| /// MSP430-specific DAG, ready for instruction scheduling. |
| /// |
| FunctionPass *llvm::createMSP430ISelDag(MSP430TargetMachine &TM, |
| CodeGenOpt::Level OptLevel) { |
| return new MSP430DAGToDAGISel(TM, OptLevel); |
| } |
| |
| // FIXME: This is pretty dummy routine and needs to be rewritten in the future. |
| bool MSP430DAGToDAGISel::SelectAddr(SDValue Op, SDValue Addr, |
| SDValue &Base, SDValue &Disp) { |
| // Try to match frame address first. |
| if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) { |
| Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i16); |
| Disp = CurDAG->getTargetConstant(0, MVT::i16); |
| return true; |
| } |
| |
| switch (Addr.getOpcode()) { |
| case ISD::ADD: |
| // Operand is a result from ADD with constant operand which fits into i16. |
| if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) { |
| uint64_t CVal = CN->getZExtValue(); |
| // Offset should fit into 16 bits. |
| if (((CVal << 48) >> 48) == CVal) { |
| SDValue N0 = Addr.getOperand(0); |
| if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N0)) |
| Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i16); |
| else |
| Base = N0; |
| |
| Disp = CurDAG->getTargetConstant(CVal, MVT::i16); |
| return true; |
| } |
| } |
| break; |
| case MSP430ISD::Wrapper: |
| SDValue N0 = Addr.getOperand(0); |
| if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(N0)) { |
| Base = CurDAG->getTargetGlobalAddress(G->getGlobal(), |
| MVT::i16, G->getOffset()); |
| Disp = CurDAG->getTargetConstant(0, MVT::i16); |
| return true; |
| } else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(N0)) { |
| Base = CurDAG->getTargetExternalSymbol(E->getSymbol(), MVT::i16); |
| Disp = CurDAG->getTargetConstant(0, MVT::i16); |
| } |
| break; |
| }; |
| |
| Base = Addr; |
| Disp = CurDAG->getTargetConstant(0, MVT::i16); |
| |
| return true; |
| } |
| |
| |
| |
| /// InstructionSelect - This callback is invoked by |
| /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. |
| void MSP430DAGToDAGISel::InstructionSelect() { |
| DEBUG(BB->dump()); |
| |
| // Codegen the basic block. |
| #ifndef NDEBUG |
| DOUT << "===== Instruction selection begins:\n"; |
| Indent = 0; |
| #endif |
| SelectRoot(*CurDAG); |
| #ifndef NDEBUG |
| DOUT << "===== Instruction selection ends:\n"; |
| #endif |
| |
| CurDAG->RemoveDeadNodes(); |
| } |
| |
| SDNode *MSP430DAGToDAGISel::Select(SDValue Op) { |
| SDNode *Node = Op.getNode(); |
| DebugLoc dl = Op.getDebugLoc(); |
| |
| // Dump information about the Node being selected |
| #ifndef NDEBUG |
| DOUT << std::string(Indent, ' ') << "Selecting: "; |
| DEBUG(Node->dump(CurDAG)); |
| DOUT << "\n"; |
| Indent += 2; |
| #endif |
| |
| // If we have a custom node, we already have selected! |
| if (Node->isMachineOpcode()) { |
| #ifndef NDEBUG |
| DOUT << std::string(Indent-2, ' ') << "== "; |
| DEBUG(Node->dump(CurDAG)); |
| DOUT << "\n"; |
| Indent -= 2; |
| #endif |
| return NULL; |
| } |
| |
| // Few custom selection stuff. |
| switch (Node->getOpcode()) { |
| default: break; |
| case ISD::FrameIndex: { |
| assert(Op.getValueType() == MVT::i16); |
| int FI = cast<FrameIndexSDNode>(Node)->getIndex(); |
| SDValue TFI = CurDAG->getTargetFrameIndex(FI, MVT::i16); |
| if (Node->hasOneUse()) |
| return CurDAG->SelectNodeTo(Node, MSP430::ADD16ri, MVT::i16, |
| TFI, CurDAG->getTargetConstant(0, MVT::i16)); |
| return CurDAG->getTargetNode(MSP430::ADD16ri, dl, MVT::i16, |
| TFI, CurDAG->getTargetConstant(0, MVT::i16)); |
| } |
| } |
| |
| // Select the default instruction |
| SDNode *ResNode = SelectCode(Op); |
| |
| #ifndef NDEBUG |
| DOUT << std::string(Indent-2, ' ') << "=> "; |
| if (ResNode == NULL || ResNode == Op.getNode()) |
| DEBUG(Op.getNode()->dump(CurDAG)); |
| else |
| DEBUG(ResNode->dump(CurDAG)); |
| DOUT << "\n"; |
| Indent -= 2; |
| #endif |
| |
| return ResNode; |
| } |