//===-- AlphaISelDAGToDAG.cpp - Alpha pattern matching inst selector ------===// // // The LLVM Compiler Infrastructure // // This file was developed by Andrew Lenharth and is distributed under // the University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file defines a pattern matching instruction selector for Alpha, // converting from a legalized dag to a Alpha dag. // //===----------------------------------------------------------------------===// #include "Alpha.h" #include "AlphaTargetMachine.h" #include "AlphaISelLowering.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/SSARegMap.h" #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/Target/TargetOptions.h" #include "llvm/ADT/Statistic.h" #include "llvm/Constants.h" #include "llvm/GlobalValue.h" #include "llvm/Support/Debug.h" #include "llvm/Support/MathExtras.h" #include using namespace llvm; namespace { //===--------------------------------------------------------------------===// /// AlphaDAGToDAGISel - Alpha specific code to select Alpha machine /// instructions for SelectionDAG operations. /// class AlphaDAGToDAGISel : public SelectionDAGISel { AlphaTargetLowering AlphaLowering; public: AlphaDAGToDAGISel(TargetMachine &TM) : SelectionDAGISel(AlphaLowering), AlphaLowering(TM) {} /// getI64Imm - Return a target constant with the specified value, of type /// i64. inline SDOperand getI64Imm(int64_t Imm) { return CurDAG->getTargetConstant(Imm, MVT::i64); } // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDOperand Select(SDOperand Op); /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); virtual const char *getPassName() const { return "Alpha DAG->DAG Pattern Instruction Selection"; } // Include the pieces autogenerated from the target description. #include "AlphaGenDAGISel.inc" private: SDOperand getGlobalBaseReg(); SDOperand SelectCALL(SDOperand Op); }; } /// getGlobalBaseReg - Output the instructions required to put the /// GOT address into a register. /// SDOperand AlphaDAGToDAGISel::getGlobalBaseReg() { return CurDAG->getRegister(AlphaLowering.getVRegGP(), MVT::i64); } /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. void AlphaDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) { DEBUG(BB->dump()); // Select target instructions for the DAG. DAG.setRoot(Select(DAG.getRoot())); CodeGenMap.clear(); DAG.RemoveDeadNodes(); // Emit machine code to BB. ScheduleAndEmitDAG(DAG); } // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDOperand AlphaDAGToDAGISel::Select(SDOperand Op) { SDNode *N = Op.Val; if (N->getOpcode() >= ISD::BUILTIN_OP_END && N->getOpcode() < AlphaISD::FIRST_NUMBER) return Op; // Already selected. // If this has already been converted, use it. std::map::iterator CGMI = CodeGenMap.find(Op); if (CGMI != CodeGenMap.end()) return CGMI->second; switch (N->getOpcode()) { default: break; case ISD::TAILCALL: case ISD::CALL: return SelectCALL(Op); case ISD::DYNAMIC_STACKALLOC: case ISD::ADD_PARTS: case ISD::SUB_PARTS: case ISD::SETCC: assert(0 && "You want these too?"); case ISD::BR: { CurDAG->SelectNodeTo(N, Alpha::BR_DAG, MVT::Other, N->getOperand(1), Select(N->getOperand(0))); return SDOperand(N, 0); } case ISD::TokenFactor: { SDOperand New; if (N->getNumOperands() == 2) { SDOperand Op0 = Select(N->getOperand(0)); SDOperand Op1 = Select(N->getOperand(1)); New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Op0, Op1); } else { std::vector Ops; for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) Ops.push_back(Select(N->getOperand(i))); New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops); } CodeGenMap[Op] = New; return New; } case ISD::CopyFromReg: { SDOperand Chain = Select(N->getOperand(0)); if (Chain == N->getOperand(0)) return Op; // No change SDOperand New = CurDAG->getCopyFromReg(Chain, cast(N->getOperand(1))->getReg(), N->getValueType(0)); return New.getValue(Op.ResNo); } case ISD::CopyToReg: { SDOperand Chain = Select(N->getOperand(0)); SDOperand Reg = N->getOperand(1); SDOperand Val = Select(N->getOperand(2)); SDOperand New = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg, Val); CodeGenMap[Op] = New; return New; } case ISD::UNDEF: if (N->getValueType(0) == MVT::i64) CurDAG->SelectNodeTo(N, Alpha::IDEF, MVT::i64); // else if (N->getValueType(0) == MVT::f32) // CurDAG->SelectNodeTo(N, PPC::IMPLICIT_DEF_F4, MVT::f32); // else // CurDAG->SelectNodeTo(N, PPC::IMPLICIT_DEF_F8, MVT::f64); return SDOperand(N, 0); case ISD::FrameIndex: { // int FI = cast(N)->getIndex(); // CurDAG->SelectNodeTo(N, Alpha::LDA, MVT::i64, // CurDAG->getTargetFrameIndex(FI, MVT::i32), // getI32Imm(0)); // return SDOperand(N, 0); assert(0 && "Frame?, you are suppose to look through the window, not at the frame!"); } case ISD::ConstantPool: { // Constant *C = cast(N)->get(); // SDOperand Tmp, CPI = CurDAG->getTargetConstantPool(C, MVT::i32); // if (PICEnabled) // Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),CPI); // else // Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, CPI); // CurDAG->SelectNodeTo(N, PPC::LA, MVT::i32, Tmp, CPI); // return SDOperand(N, 0); assert(0 && "Constants are overrated"); } case ISD::GlobalAddress: { GlobalValue *GV = cast(N)->getGlobal(); SDOperand GA = CurDAG->getTargetGlobalAddress(GV, MVT::i64); CurDAG->SelectNodeTo(N, Alpha::LDQl, MVT::i64, GA, getGlobalBaseReg()); return SDOperand(N, 0); } case ISD::CALLSEQ_START: case ISD::CALLSEQ_END: { unsigned Amt = cast(N->getOperand(1))->getValue(); unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ? Alpha::ADJUSTSTACKDOWN : Alpha::ADJUSTSTACKUP; CurDAG->SelectNodeTo(N, Opc, MVT::Other, getI64Imm(Amt), Select(N->getOperand(0))); return SDOperand(N, 0); } case ISD::RET: { SDOperand Chain = Select(N->getOperand(0)); // Token chain. if (N->getNumOperands() == 2) { SDOperand Val = Select(N->getOperand(1)); if (N->getOperand(1).getValueType() == MVT::i64) { Chain = CurDAG->getCopyToReg(Chain, Alpha::R0, Val); } } //BuildMI(BB, Alpha::RET, 2, Alpha::R31).addReg(Alpha::R26).addImm(1); // FIXME: add restoring of the RA to R26 to the chain // Finally, select this to a ret instruction. CurDAG->SelectNodeTo(N, Alpha::RETDAG, MVT::Other, Chain); return SDOperand(N, 0); } } return SelectCode(Op); } SDOperand AlphaDAGToDAGISel::SelectCALL(SDOperand Op) { SDNode *N = Op.Val; SDOperand Chain = Select(N->getOperand(0)); SDOperand InFlag; // Null incoming flag value. SDOperand Addr = Select(N->getOperand(1)); // unsigned CallOpcode; std::vector CallOperands; std::vector TypeOperands; CallOperands.push_back(CurDAG->getCopyToReg(Chain, Alpha::R27, Addr)); CallOperands.push_back(getI64Imm(0)); //grab the arguments for(int i = 2, e = N->getNumOperands(); i < e; ++i) { CallOperands.push_back(Select(N->getOperand(i))); TypeOperands.push_back(N->getOperand(i).getValueType()); } static const unsigned args_int[] = {Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21}; static const unsigned args_float[] = {Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21}; for (unsigned i = 0; i < std::min((size_t)6, CallOperands.size()); ++i) { if (MVT::isInteger(TypeOperands[i])) { Chain = CurDAG->getCopyToReg(Chain, args_int[i], CallOperands[i], InFlag); InFlag = Chain.getValue(1); CallOperands.push_back(CurDAG->getRegister(args_int[i], TypeOperands[i])); } else { assert(0 && "No FP support yet"); } } assert(CallOperands.size() <= 6 && "Too big a call"); // Finally, once everything is in registers to pass to the call, emit the // call itself. if (InFlag.Val) CallOperands.push_back(InFlag); // Strong dep on register copies. else CallOperands.push_back(Chain); // Weak dep on whatever occurs before Chain = CurDAG->getTargetNode(Alpha::JSR, MVT::Other, MVT::Flag, CallOperands); std::vector CallResults; switch (N->getValueType(0)) { default: assert(0 && "Unexpected ret value!"); case MVT::Other: break; case MVT::i64: Chain = CurDAG->getCopyFromReg(Chain, Alpha::R0, MVT::i64, Chain.getValue(1)).getValue(1); CallResults.push_back(Chain.getValue(0)); break; } CallResults.push_back(Chain); for (unsigned i = 0, e = CallResults.size(); i != e; ++i) CodeGenMap[Op.getValue(i)] = CallResults[i]; return CallResults[Op.ResNo]; } /// createAlphaISelDag - This pass converts a legalized DAG into a /// Alpha-specific DAG, ready for instruction scheduling. /// FunctionPass *llvm::createAlphaISelDag(TargetMachine &TM) { return new AlphaDAGToDAGISel(TM); }