MSP430ISelLowering.cpp revision b8639f52143c99a3902b83555db4c54766c783ca
1f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov//===-- MSP430ISelLowering.cpp - MSP430 DAG Lowering Implementation ------===// 2f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// 3f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// The LLVM Compiler Infrastructure 4f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// 5f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// This file is distributed under the University of Illinois Open Source 6f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// License. See LICENSE.TXT for details. 7f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// 8f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov//===----------------------------------------------------------------------===// 9f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// 10f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// This file implements the MSP430TargetLowering class. 11f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov// 12f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov//===----------------------------------------------------------------------===// 13f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 14f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#define DEBUG_TYPE "msp430-lower" 15f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 16f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "MSP430ISelLowering.h" 17f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "MSP430.h" 18f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "MSP430TargetMachine.h" 19f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "MSP430Subtarget.h" 20f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/DerivedTypes.h" 21f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/Function.h" 22f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/Intrinsics.h" 23f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CallingConv.h" 24f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/GlobalVariable.h" 25f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/GlobalAlias.h" 26f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/CallingConvLower.h" 27f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/MachineFrameInfo.h" 28f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/MachineFunction.h" 29f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/MachineInstrBuilder.h" 30f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/MachineRegisterInfo.h" 31c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov#include "llvm/CodeGen/PseudoSourceValue.h" 32f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/SelectionDAGISel.h" 33f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/CodeGen/ValueTypes.h" 34f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/Support/Debug.h" 35f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "llvm/ADT/VectorExtras.h" 36f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikovusing namespace llvm; 37f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 38f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton KorobeynikovMSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) : 39f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov TargetLowering(tm), Subtarget(*tm.getSubtargetImpl()), TM(tm) { 40f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 41f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov // Set up the register classes. 421df221f2bb8e8380e255d1bec73ab07b388d01a2Anton Korobeynikov addRegisterClass(MVT::i16, MSP430::GR16RegisterClass); 43f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 44f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov // Compute derived properties from the register classes 45f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov computeRegisterProperties(); 46fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 471476d97037e07d17635468fcd3a2ee0111972574Anton Korobeynikov // Provide all sorts of operation actions 481476d97037e07d17635468fcd3a2ee0111972574Anton Korobeynikov 491476d97037e07d17635468fcd3a2ee0111972574Anton Korobeynikov // Division is expensive 501476d97037e07d17635468fcd3a2ee0111972574Anton Korobeynikov setIntDivIsCheap(false); 511476d97037e07d17635468fcd3a2ee0111972574Anton Korobeynikov 52d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // Even if we have only 1 bit shift here, we can perform 53d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // shifts of the whole bitwidth 1 bit per step. 54d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov setShiftAmountType(MVT::i8); 55d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 56d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov setOperationAction(ISD::SRA, MVT::i16, Custom); 57d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 58fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov setOperationAction(ISD::RET, MVT::Other, Custom); 59f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov} 60f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 61b8639f52143c99a3902b83555db4c54766c783caAnton KorobeynikovSDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) { 62f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov switch (Op.getOpcode()) { 63c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG); 64d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov case ISD::SRA: return LowerShifts(Op, DAG); 65fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov case ISD::RET: return LowerRET(Op, DAG); 66f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov default: 67f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov assert(0 && "unimplemented operand"); 68f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov return SDValue(); 69f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov } 70f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov} 71f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov 72c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov//===----------------------------------------------------------------------===// 73c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov// Calling Convention Implementation 74c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov//===----------------------------------------------------------------------===// 75c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 76f2c3e179ecc2a6ebc259382828a5e5dc5a61d2f8Anton Korobeynikov#include "MSP430GenCallingConv.inc" 77c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 78c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton KorobeynikovSDValue MSP430TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, 79c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SelectionDAG &DAG) { 80c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue(); 81c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov switch (CC) { 82c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov default: 83c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov assert(0 && "Unsupported calling convention"); 84c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov case CallingConv::C: 85c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov case CallingConv::Fast: 86c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov return LowerCCCArguments(Op, DAG); 87c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } 88c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov} 89c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 90c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov/// LowerCCCArguments - transform physical registers into virtual registers and 91c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov/// generate load operations for arguments places on the stack. 92c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov// FIXME: struct return stuff 93c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov// FIXME: varargs 94dcb802cf7be8e540e487c699f25d89c4821536abAnton KorobeynikovSDValue MSP430TargetLowering::LowerCCCArguments(SDValue Op, 95dcb802cf7be8e540e487c699f25d89c4821536abAnton Korobeynikov SelectionDAG &DAG) { 96c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov MachineFunction &MF = DAG.getMachineFunction(); 97c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov MachineFrameInfo *MFI = MF.getFrameInfo(); 98c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov MachineRegisterInfo &RegInfo = MF.getRegInfo(); 99c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SDValue Root = Op.getOperand(0); 100c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0; 101c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov unsigned CC = MF.getFunction()->getCallingConv(); 102c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov DebugLoc dl = Op.getDebugLoc(); 103c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 104c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Assign locations to all of the incoming arguments. 105c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SmallVector<CCValAssign, 16> ArgLocs; 106c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs); 107c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_MSP430); 108c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 109c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov assert(!isVarArg && "Varargs not supported yet"); 110c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 111c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SmallVector<SDValue, 16> ArgValues; 112c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { 113c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov CCValAssign &VA = ArgLocs[i]; 114c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov if (VA.isRegLoc()) { 115c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Arguments passed in registers 116c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov MVT RegVT = VA.getLocVT(); 117c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov switch (RegVT.getSimpleVT()) { 118c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov default: 119c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: " 120c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov << RegVT.getSimpleVT() 121c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov << "\n"; 122c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov abort(); 123c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov case MVT::i16: 124c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov unsigned VReg = 1251df221f2bb8e8380e255d1bec73ab07b388d01a2Anton Korobeynikov RegInfo.createVirtualRegister(MSP430::GR16RegisterClass); 126c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov RegInfo.addLiveIn(VA.getLocReg(), VReg); 127c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SDValue ArgValue = DAG.getCopyFromReg(Root, dl, VReg, RegVT); 128c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 129c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // If this is an 8-bit value, it is really passed promoted to 16 130c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // bits. Insert an assert[sz]ext to capture this, then truncate to the 131c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // right size. 132c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov if (VA.getLocInfo() == CCValAssign::SExt) 133c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue, 134c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov DAG.getValueType(VA.getValVT())); 135c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov else if (VA.getLocInfo() == CCValAssign::ZExt) 136c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue, 137c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov DAG.getValueType(VA.getValVT())); 138c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 139c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov if (VA.getLocInfo() != CCValAssign::Full) 140c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); 141c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 142c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValues.push_back(ArgValue); 143c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } 144c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } else { 145c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Sanity check 146c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov assert(VA.isMemLoc()); 147c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Load the argument to a virtual register 148c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov unsigned ObjSize = VA.getLocVT().getSizeInBits()/8; 149c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov if (ObjSize > 2) { 150c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: " 151c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov << VA.getLocVT().getSimpleVT() 152c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov << "\n"; 153c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } 154c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Create the frame index object for this incoming parameter... 155c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset()); 156c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 157c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Create the SelectionDAG nodes corresponding to a load 158c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov //from this parameter 159c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov SDValue FIN = DAG.getFrameIndex(FI, MVT::i16); 160c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValues.push_back(DAG.getLoad(VA.getLocVT(), dl, Root, FIN, 161c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov PseudoSourceValue::getFixedStack(FI), 0)); 162c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } 163c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov } 164c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 165c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov ArgValues.push_back(Root); 166c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov 167c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov // Return the new list of results. 168c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(), 169c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov &ArgValues[0], ArgValues.size()).getValue(Op.getResNo()); 170c8fbb6ae2041f17285e4ba73d54d388e703b9689Anton Korobeynikov} 171fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 172fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton KorobeynikovSDValue MSP430TargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) { 173fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // CCValAssign - represent the assignment of the return value to a location 174fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov SmallVector<CCValAssign, 16> RVLocs; 175fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv(); 176fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg(); 177fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov DebugLoc dl = Op.getDebugLoc(); 178fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 179fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // CCState - Info about the registers and stack slot. 180fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs); 181fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 182fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // Analize return values of ISD::RET 183fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov CCInfo.AnalyzeReturn(Op.getNode(), RetCC_MSP430); 184fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 185fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // If this is the first return lowered for this function, add the regs to the 186fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // liveout set for the function. 187fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov if (DAG.getMachineFunction().getRegInfo().liveout_empty()) { 188fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov for (unsigned i = 0; i != RVLocs.size(); ++i) 189fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov if (RVLocs[i].isRegLoc()) 190fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg()); 191fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov } 192fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 193fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // The chain is always operand #0 194fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov SDValue Chain = Op.getOperand(0); 195fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov SDValue Flag; 196fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 197fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // Copy the result values into the output registers. 198fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov for (unsigned i = 0; i != RVLocs.size(); ++i) { 199fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov CCValAssign &VA = RVLocs[i]; 200fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov assert(VA.isRegLoc() && "Can only return in registers!"); 201fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 202fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // ISD::RET => ret chain, (regnum1,val1), ... 203fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // So i*2+1 index only the regnums 204fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), 205fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov Op.getOperand(i*2+1), Flag); 206fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 207dcb802cf7be8e540e487c699f25d89c4821536abAnton Korobeynikov // Guarantee that all emitted copies are stuck together, 208dcb802cf7be8e540e487c699f25d89c4821536abAnton Korobeynikov // avoiding something bad. 209fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov Flag = Chain.getValue(1); 210fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov } 211fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 212fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov if (Flag.getNode()) 213fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov return DAG.getNode(MSP430ISD::RET_FLAG, dl, MVT::Other, Chain, Flag); 214fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 215fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov // Return Void 216fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov return DAG.getNode(MSP430ISD::RET_FLAG, dl, MVT::Other, Chain); 217fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov} 218fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 219d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton KorobeynikovSDValue MSP430TargetLowering::LowerShifts(SDValue Op, 220d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov SelectionDAG &DAG) { 221d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov assert(Op.getOpcode() == ISD::SRA && "Only SRA is currently supported."); 222d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov SDNode* N = Op.getNode(); 223d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov MVT VT = Op.getValueType(); 224d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov DebugLoc dl = N->getDebugLoc(); 225d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 226d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // We currently only lower SRA of constant argument. 227d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov if (!isa<ConstantSDNode>(N->getOperand(1))) 228d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov return SDValue(); 229d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 230d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue(); 231d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 232d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // Expand the stuff into sequence of shifts. 233d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // FIXME: for some shift amounts this might be done better! 234d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov // E.g.: foo >> (8 + N) => sxt(swpb(foo)) >> N 235d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov SDValue Victim = N->getOperand(0); 236d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov while (ShiftAmount--) 237d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov Victim = DAG.getNode(MSP430ISD::RRA, dl, VT, Victim); 238d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 239d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov return Victim; 240d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov} 241d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov 242fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikovconst char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const { 243fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov switch (Opcode) { 244fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov default: return NULL; 245fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG"; 246d2c94ae49e546e68b591e838cdfc2fd016d928d9Anton Korobeynikov case MSP430ISD::RRA: return "MSP430ISD::RRA"; 247fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov } 248fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov} 249fd1b7c778c0c332a676b1003115d2b4bc6f9a46aAnton Korobeynikov 250