//===-- SparcV8ISelDAGToDAG.cpp - A dag to dag inst selector for SparcV8 --===// // // The LLVM Compiler Infrastructure // // This file was developed by Chris Lattner and is distributed under // the University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file defines an instruction selector for the V8 target // //===----------------------------------------------------------------------===// #include "SparcV8.h" #include "SparcV8TargetMachine.h" #include "llvm/DerivedTypes.h" #include "llvm/Function.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/CodeGen/SSARegMap.h" #include "llvm/Target/TargetLowering.h" #include "llvm/Support/Debug.h" #include using namespace llvm; //===----------------------------------------------------------------------===// // TargetLowering Implementation //===----------------------------------------------------------------------===// namespace V8ISD { enum { FIRST_NUMBER = ISD::BUILTIN_OP_END+V8::INSTRUCTION_LIST_END, CMPICC, // Compare two GPR operands, set icc. CMPFCC, // Compare two FP operands, set fcc. BRICC, // Branch to dest on icc condition BRFCC, // Branch to dest on fcc condition Hi, Lo, // Hi/Lo operations, typically on a global address. FTOI, // FP to Int within a FP register. ITOF, // Int to FP within a FP register. SELECT_ICC, // Select between two values using the current ICC flags. SELECT_FCC, // Select between two values using the current FCC flags. CALL, // A V8 call instruction. RET_FLAG, // Return with a flag operand. }; } namespace { class SparcV8TargetLowering : public TargetLowering { int VarArgsFrameOffset; // Frame offset to start of varargs area. public: SparcV8TargetLowering(TargetMachine &TM); virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG); virtual std::vector LowerArguments(Function &F, SelectionDAG &DAG); virtual std::pair LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC, bool isTailCall, SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG); virtual std::pair LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth, SelectionDAG &DAG); virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI, MachineBasicBlock *MBB); virtual const char *getTargetNodeName(unsigned Opcode) const; }; } SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM) : TargetLowering(TM) { // Set up the register classes. addRegisterClass(MVT::i32, V8::IntRegsRegisterClass); addRegisterClass(MVT::f32, V8::FPRegsRegisterClass); addRegisterClass(MVT::f64, V8::DFPRegsRegisterClass); // Custom legalize GlobalAddress nodes into LO/HI parts. setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); setOperationAction(ISD::ConstantPool , MVT::i32, Custom); // Sparc doesn't have sext_inreg, replace them with shl/sra setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand); setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand); setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand); // Sparc has no REM operation. setOperationAction(ISD::UREM, MVT::i32, Expand); setOperationAction(ISD::SREM, MVT::i32, Expand); // Custom expand fp<->sint setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom); setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom); // Expand fp<->uint setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand); setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand); // Turn FP extload into load/fextend setOperationAction(ISD::EXTLOAD, MVT::f32, Expand); // Sparc has no select or setcc: expand to SELECT_CC. setOperationAction(ISD::SELECT, MVT::i32, Expand); setOperationAction(ISD::SELECT, MVT::f32, Expand); setOperationAction(ISD::SELECT, MVT::f64, Expand); setOperationAction(ISD::SETCC, MVT::i32, Expand); setOperationAction(ISD::SETCC, MVT::f32, Expand); setOperationAction(ISD::SETCC, MVT::f64, Expand); // Sparc doesn't have BRCOND either, it has BR_CC. setOperationAction(ISD::BRCOND, MVT::Other, Expand); setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand); setOperationAction(ISD::BRTWOWAY_CC, MVT::Other, Expand); setOperationAction(ISD::BR_CC, MVT::i32, Custom); setOperationAction(ISD::BR_CC, MVT::f32, Custom); setOperationAction(ISD::BR_CC, MVT::f64, Custom); setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); // V8 has no intrinsics for these particular operations. setOperationAction(ISD::MEMMOVE, MVT::Other, Expand); setOperationAction(ISD::MEMSET, MVT::Other, Expand); setOperationAction(ISD::MEMCPY, MVT::Other, Expand); setOperationAction(ISD::FSIN , MVT::f64, Expand); setOperationAction(ISD::FCOS , MVT::f64, Expand); setOperationAction(ISD::FSIN , MVT::f32, Expand); setOperationAction(ISD::FCOS , MVT::f32, Expand); setOperationAction(ISD::CTPOP, MVT::i32, Expand); setOperationAction(ISD::CTTZ , MVT::i32, Expand); setOperationAction(ISD::CTLZ , MVT::i32, Expand); setOperationAction(ISD::ROTL , MVT::i32, Expand); setOperationAction(ISD::ROTR , MVT::i32, Expand); setOperationAction(ISD::BSWAP, MVT::i32, Expand); setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); // We don't have line number support yet. setOperationAction(ISD::LOCATION, MVT::Other, Expand); setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand); setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand); // RET must be custom lowered, to meet ABI requirements setOperationAction(ISD::RET , MVT::Other, Custom); // VASTART needs to be custom lowered to use the VarArgsFrameIndex setOperationAction(ISD::VASTART , MVT::Other, Custom); // Use the default implementation. setOperationAction(ISD::VAARG , MVT::Other, Expand); setOperationAction(ISD::VACOPY , MVT::Other, Expand); setOperationAction(ISD::VAEND , MVT::Other, Expand); setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand); setStackPointerRegisterToSaveRestore(V8::O6); computeRegisterProperties(); } const char *SparcV8TargetLowering::getTargetNodeName(unsigned Opcode) const { switch (Opcode) { default: return 0; case V8ISD::CMPICC: return "V8ISD::CMPICC"; case V8ISD::CMPFCC: return "V8ISD::CMPFCC"; case V8ISD::BRICC: return "V8ISD::BRICC"; case V8ISD::BRFCC: return "V8ISD::BRFCC"; case V8ISD::Hi: return "V8ISD::Hi"; case V8ISD::Lo: return "V8ISD::Lo"; case V8ISD::FTOI: return "V8ISD::FTOI"; case V8ISD::ITOF: return "V8ISD::ITOF"; case V8ISD::SELECT_ICC: return "V8ISD::SELECT_ICC"; case V8ISD::SELECT_FCC: return "V8ISD::SELECT_FCC"; case V8ISD::CALL: return "V8ISD::CALL"; case V8ISD::RET_FLAG: return "V8ISD::RET_FLAG"; } } /// LowerArguments - V8 uses a very simple ABI, where all values are passed in /// either one or two GPRs, including FP values. TODO: we should pass FP values /// in FP registers for fastcc functions. std::vector SparcV8TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) { MachineFunction &MF = DAG.getMachineFunction(); SSARegMap *RegMap = MF.getSSARegMap(); std::vector ArgValues; static const unsigned ArgRegs[] = { V8::I0, V8::I1, V8::I2, V8::I3, V8::I4, V8::I5 }; const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6; unsigned ArgOffset = 68; SDOperand Root = DAG.getRoot(); std::vector OutChains; for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) { MVT::ValueType ObjectVT = getValueType(I->getType()); switch (ObjectVT) { default: assert(0 && "Unhandled argument type!"); case MVT::i1: case MVT::i8: case MVT::i16: case MVT::i32: if (I->use_empty()) { // Argument is dead. if (CurArgReg < ArgRegEnd) ++CurArgReg; ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass); MF.addLiveIn(*CurArgReg++, VReg); SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); if (ObjectVT != MVT::i32) { unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext : ISD::AssertZext; Arg = DAG.getNode(AssertOp, MVT::i32, Arg, DAG.getValueType(ObjectVT)); Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg); } ArgValues.push_back(Arg); } else { int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); SDOperand Load; if (ObjectVT == MVT::i32) { Load = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0)); } else { unsigned LoadOp = I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD; // Sparc is big endian, so add an offset based on the ObjectVT. unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8); FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr, DAG.getConstant(Offset, MVT::i32)); Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr, DAG.getSrcValue(0), ObjectVT); Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load); } ArgValues.push_back(Load); } ArgOffset += 4; break; case MVT::f32: if (I->use_empty()) { // Argument is dead. if (CurArgReg < ArgRegEnd) ++CurArgReg; ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR // FP value is passed in an integer register. unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass); MF.addLiveIn(*CurArgReg++, VReg); SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg); ArgValues.push_back(Arg); } else { int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, DAG.getSrcValue(0)); ArgValues.push_back(Load); } ArgOffset += 4; break; case MVT::i64: case MVT::f64: if (I->use_empty()) { // Argument is dead. if (CurArgReg < ArgRegEnd) ++CurArgReg; if (CurArgReg < ArgRegEnd) ++CurArgReg; ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); } else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 && ((CurArgReg-ArgRegs) & 1) == 0) { // If this is a double argument and the whole thing lives on the stack, // and the argument is aligned, load the double straight from the stack. // We can't do a load in cases like void foo([6ints], int,double), // because the double wouldn't be aligned! int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr, DAG.getSrcValue(0))); } else { SDOperand HiVal; if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass); MF.addLiveIn(*CurArgReg++, VRegHi); HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32); } else { int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0)); } SDOperand LoVal; if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass); MF.addLiveIn(*CurArgReg++, VRegLo); LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32); } else { int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0)); } // Compose the two halves together into an i64 unit. SDOperand WholeValue = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal); // If we want a double, do a bit convert. if (ObjectVT == MVT::f64) WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue); ArgValues.push_back(WholeValue); } ArgOffset += 8; break; } } // Store remaining ArgRegs to the stack if this is a varargs function. if (F.getFunctionType()->isVarArg()) { // Remember the vararg offset for the va_start implementation. VarArgsFrameOffset = ArgOffset; for (; CurArgReg != ArgRegEnd; ++CurArgReg) { unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass); MF.addLiveIn(*CurArgReg, VReg); SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32); int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(), Arg, FIPtr, DAG.getSrcValue(0))); ArgOffset += 4; } } if (!OutChains.empty()) DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains)); // Finally, inform the code generator which regs we return values in. switch (getValueType(F.getReturnType())) { default: assert(0 && "Unknown type!"); case MVT::isVoid: break; case MVT::i1: case MVT::i8: case MVT::i16: case MVT::i32: MF.addLiveOut(V8::I0); break; case MVT::i64: MF.addLiveOut(V8::I0); MF.addLiveOut(V8::I1); break; case MVT::f32: MF.addLiveOut(V8::F0); break; case MVT::f64: MF.addLiveOut(V8::D0); break; } return ArgValues; } std::pair SparcV8TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC, bool isTailCall, SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG) { MachineFunction &MF = DAG.getMachineFunction(); // Count the size of the outgoing arguments. unsigned ArgsSize = 0; for (unsigned i = 0, e = Args.size(); i != e; ++i) { switch (getValueType(Args[i].second)) { default: assert(0 && "Unknown value type!"); case MVT::i1: case MVT::i8: case MVT::i16: case MVT::i32: case MVT::f32: ArgsSize += 4; break; case MVT::i64: case MVT::f64: ArgsSize += 8; break; } } if (ArgsSize > 4*6) ArgsSize -= 4*6; // Space for first 6 arguments is prereserved. else ArgsSize = 0; // Keep stack frames 8-byte aligned. ArgsSize = (ArgsSize+7) & ~7; Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain, DAG.getConstant(ArgsSize, getPointerTy())); SDOperand StackPtr, NullSV; std::vector Stores; std::vector RegValuesToPass; unsigned ArgOffset = 68; for (unsigned i = 0, e = Args.size(); i != e; ++i) { SDOperand Val = Args[i].first; MVT::ValueType ObjectVT = Val.getValueType(); SDOperand ValToStore(0, 0); unsigned ObjSize; switch (ObjectVT) { default: assert(0 && "Unhandled argument type!"); case MVT::i1: case MVT::i8: case MVT::i16: // Promote the integer to 32-bits. If the input type is signed, use a // sign extend, otherwise use a zero extend. if (Args[i].second->isSigned()) Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val); else Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val); // FALL THROUGH case MVT::i32: ObjSize = 4; if (RegValuesToPass.size() >= 6) { ValToStore = Val; } else { RegValuesToPass.push_back(Val); } break; case MVT::f32: ObjSize = 4; if (RegValuesToPass.size() >= 6) { ValToStore = Val; } else { // Convert this to a FP value in an int reg. Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val); RegValuesToPass.push_back(Val); } break; case MVT::f64: ObjSize = 8; // If we can store this directly into the outgoing slot, do so. We can // do this when all ArgRegs are used and if the outgoing slot is aligned. // FIXME: McGill/misr fails with this. if (0 && RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) { ValToStore = Val; break; } // Otherwise, convert this to a FP value in int regs. Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val); // FALL THROUGH case MVT::i64: ObjSize = 8; if (RegValuesToPass.size() >= 6) { ValToStore = Val; // Whole thing is passed in memory. break; } // Split the value into top and bottom part. Top part goes in a reg. SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val, DAG.getConstant(1, MVT::i32)); SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val, DAG.getConstant(0, MVT::i32)); RegValuesToPass.push_back(Hi); if (RegValuesToPass.size() >= 6) { ValToStore = Lo; ArgOffset += 4; ObjSize = 4; } else { RegValuesToPass.push_back(Lo); } break; } if (ValToStore.Val) { if (!StackPtr.Val) { StackPtr = DAG.getRegister(V8::O6, MVT::i32); NullSV = DAG.getSrcValue(NULL); } SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy()); PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff); Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain, ValToStore, PtrOff, NullSV)); } ArgOffset += ObjSize; } // Emit all stores, make sure the occur before any copies into physregs. if (!Stores.empty()) Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores); static const unsigned ArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3, V8::O4, V8::O5 }; // Build a sequence of copy-to-reg nodes chained together with token chain // and flag operands which copy the outgoing args into O[0-5]. SDOperand InFlag; for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) { Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag); InFlag = Chain.getValue(1); } // If the callee is a GlobalAddress node (quite common, every direct call is) // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. if (GlobalAddressSDNode *G = dyn_cast(Callee)) Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32); std::vector NodeTys; NodeTys.push_back(MVT::Other); // Returns a chain NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use. std::vector Ops; Ops.push_back(Chain); Ops.push_back(Callee); if (InFlag.Val) Ops.push_back(InFlag); Chain = DAG.getNode(V8ISD::CALL, NodeTys, Ops); InFlag = Chain.getValue(1); MVT::ValueType RetTyVT = getValueType(RetTy); SDOperand RetVal; if (RetTyVT != MVT::isVoid) { switch (RetTyVT) { default: assert(0 && "Unknown value type to return!"); case MVT::i1: case MVT::i8: case MVT::i16: RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag); Chain = RetVal.getValue(1); // Add a note to keep track of whether it is sign or zero extended. RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext, MVT::i32, RetVal, DAG.getValueType(RetTyVT)); RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal); break; case MVT::i32: RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag); Chain = RetVal.getValue(1); break; case MVT::f32: RetVal = DAG.getCopyFromReg(Chain, V8::F0, MVT::f32, InFlag); Chain = RetVal.getValue(1); break; case MVT::f64: RetVal = DAG.getCopyFromReg(Chain, V8::D0, MVT::f64, InFlag); Chain = RetVal.getValue(1); break; case MVT::i64: SDOperand Lo = DAG.getCopyFromReg(Chain, V8::O1, MVT::i32, InFlag); SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), V8::O0, MVT::i32, Lo.getValue(2)); RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi); Chain = Hi.getValue(1); break; } } Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain, DAG.getConstant(ArgsSize, getPointerTy())); return std::make_pair(RetVal, Chain); } std::pair SparcV8TargetLowering:: LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth, SelectionDAG &DAG) { assert(0 && "Unimp"); abort(); } SDOperand SparcV8TargetLowering:: LowerOperation(SDOperand Op, SelectionDAG &DAG) { switch (Op.getOpcode()) { default: assert(0 && "Should not custom lower this!"); case ISD::GlobalAddress: { GlobalValue *GV = cast(Op)->getGlobal(); SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32); SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, GA); SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, GA); return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); } case ISD::ConstantPool: { Constant *C = cast(Op)->get(); SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32); SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, CP); SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, CP); return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); } case ISD::FP_TO_SINT: // Convert the fp value to integer in an FP register. assert(Op.getValueType() == MVT::i32); Op = DAG.getNode(V8ISD::FTOI, MVT::f32, Op.getOperand(0)); return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op); case ISD::SINT_TO_FP: { assert(Op.getOperand(0).getValueType() == MVT::i32); SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0)); // Convert the int value to FP in an FP register. return DAG.getNode(V8ISD::ITOF, Op.getValueType(), Tmp); } case ISD::BR_CC: { SDOperand Chain = Op.getOperand(0); SDOperand CC = Op.getOperand(1); SDOperand LHS = Op.getOperand(2); SDOperand RHS = Op.getOperand(3); SDOperand Dest = Op.getOperand(4); // Get the condition flag. if (LHS.getValueType() == MVT::i32) { std::vector VTs; VTs.push_back(MVT::i32); VTs.push_back(MVT::Flag); std::vector Ops; Ops.push_back(LHS); Ops.push_back(RHS); SDOperand Cond = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1); return DAG.getNode(V8ISD::BRICC, MVT::Other, Chain, Dest, CC, Cond); } else { SDOperand Cond = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS); return DAG.getNode(V8ISD::BRFCC, MVT::Other, Chain, Dest, CC, Cond); } } case ISD::SELECT_CC: { SDOperand LHS = Op.getOperand(0); SDOperand RHS = Op.getOperand(1); unsigned CC = cast(Op.getOperand(4))->get(); SDOperand TrueVal = Op.getOperand(2); SDOperand FalseVal = Op.getOperand(3); SDOperand CompareFlag; unsigned Opc; if (LHS.getValueType() == MVT::i32) { std::vector VTs; VTs.push_back(LHS.getValueType()); // subcc returns a value VTs.push_back(MVT::Flag); std::vector Ops; Ops.push_back(LHS); Ops.push_back(RHS); CompareFlag = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1); Opc = V8ISD::SELECT_ICC; } else { CompareFlag = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS); Opc = V8ISD::SELECT_FCC; } return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal, DAG.getConstant(CC, MVT::i32), CompareFlag); } case ISD::VASTART: { // vastart just stores the address of the VarArgsFrameIndex slot into the // memory location argument. SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32, DAG.getRegister(V8::I6, MVT::i32), DAG.getConstant(VarArgsFrameOffset, MVT::i32)); return DAG.getNode(ISD::STORE, MVT::Other, Op.getOperand(0), Offset, Op.getOperand(1), Op.getOperand(2)); } case ISD::RET: { SDOperand Copy; switch(Op.getNumOperands()) { default: assert(0 && "Do not know how to return this many arguments!"); abort(); case 1: return SDOperand(); // ret void is legal case 2: { unsigned ArgReg; switch(Op.getOperand(1).getValueType()) { default: assert(0 && "Unknown type to return!"); case MVT::i32: ArgReg = V8::I0; break; case MVT::f32: ArgReg = V8::F0; break; case MVT::f64: ArgReg = V8::D0; break; } Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1), SDOperand()); break; } case 3: Copy = DAG.getCopyToReg(Op.getOperand(0), V8::I0, Op.getOperand(2), SDOperand()); Copy = DAG.getCopyToReg(Copy, V8::I1, Op.getOperand(1), Copy.getValue(1)); break; } return DAG.getNode(V8ISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1)); } } } MachineBasicBlock * SparcV8TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI, MachineBasicBlock *BB) { unsigned BROpcode; // Figure out the conditional branch opcode to use for this select_cc. switch (MI->getOpcode()) { default: assert(0 && "Unknown SELECT_CC!"); case V8::SELECT_CC_Int_ICC: case V8::SELECT_CC_FP_ICC: case V8::SELECT_CC_DFP_ICC: // Integer compare. switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) { default: assert(0 && "Unknown integer condition code!"); case ISD::SETEQ: BROpcode = V8::BE; break; case ISD::SETNE: BROpcode = V8::BNE; break; case ISD::SETLT: BROpcode = V8::BL; break; case ISD::SETGT: BROpcode = V8::BG; break; case ISD::SETLE: BROpcode = V8::BLE; break; case ISD::SETGE: BROpcode = V8::BGE; break; case ISD::SETULT: BROpcode = V8::BCS; break; case ISD::SETULE: BROpcode = V8::BLEU; break; case ISD::SETUGT: BROpcode = V8::BGU; break; case ISD::SETUGE: BROpcode = V8::BCC; break; } break; case V8::SELECT_CC_Int_FCC: case V8::SELECT_CC_FP_FCC: case V8::SELECT_CC_DFP_FCC: // FP compare. switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) { default: assert(0 && "Unknown fp condition code!"); case ISD::SETEQ: BROpcode = V8::FBE; break; case ISD::SETNE: BROpcode = V8::FBNE; break; case ISD::SETLT: BROpcode = V8::FBL; break; case ISD::SETGT: BROpcode = V8::FBG; break; case ISD::SETLE: BROpcode = V8::FBLE; break; case ISD::SETGE: BROpcode = V8::FBGE; break; case ISD::SETULT: BROpcode = V8::FBUL; break; case ISD::SETULE: BROpcode = V8::FBULE; break; case ISD::SETUGT: BROpcode = V8::FBUG; break; case ISD::SETUGE: BROpcode = V8::FBUGE; break; case ISD::SETUO: BROpcode = V8::FBU; break; case ISD::SETO: BROpcode = V8::FBO; break; case ISD::SETONE: BROpcode = V8::FBLG; break; case ISD::SETUEQ: BROpcode = V8::FBUE; break; } break; } // To "insert" a SELECT_CC instruction, we actually have to insert the diamond // control-flow pattern. The incoming instruction knows the destination vreg // to set, the condition code register to branch on, the true/false values to // select between, and a branch opcode to use. const BasicBlock *LLVM_BB = BB->getBasicBlock(); ilist::iterator It = BB; ++It; // thisMBB: // ... // TrueVal = ... // [f]bCC copy1MBB // fallthrough --> copy0MBB MachineBasicBlock *thisMBB = BB; MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB); MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB); BuildMI(BB, BROpcode, 1).addMBB(sinkMBB); MachineFunction *F = BB->getParent(); F->getBasicBlockList().insert(It, copy0MBB); F->getBasicBlockList().insert(It, sinkMBB); // Update machine-CFG edges BB->addSuccessor(copy0MBB); BB->addSuccessor(sinkMBB); // copy0MBB: // %FalseValue = ... // # fallthrough to sinkMBB BB = copy0MBB; // Update machine-CFG edges BB->addSuccessor(sinkMBB); // sinkMBB: // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] // ... BB = sinkMBB; BuildMI(BB, V8::PHI, 4, MI->getOperand(0).getReg()) .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); delete MI; // The pseudo instruction is gone now. return BB; } //===----------------------------------------------------------------------===// // Instruction Selector Implementation //===----------------------------------------------------------------------===// //===--------------------------------------------------------------------===// /// SparcV8DAGToDAGISel - SPARC specific code to select Sparc V8 machine /// instructions for SelectionDAG operations. /// namespace { class SparcV8DAGToDAGISel : public SelectionDAGISel { SparcV8TargetLowering V8Lowering; public: SparcV8DAGToDAGISel(TargetMachine &TM) : SelectionDAGISel(V8Lowering), V8Lowering(TM) {} SDOperand Select(SDOperand Op); // Complex Pattern Selectors. bool SelectADDRrr(SDOperand N, SDOperand &R1, SDOperand &R2); bool SelectADDRri(SDOperand N, SDOperand &Base, SDOperand &Offset); /// 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 "SparcV8 DAG->DAG Pattern Instruction Selection"; } // Include the pieces autogenerated from the target description. #include "SparcV8GenDAGISel.inc" }; } // end anonymous namespace /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. void SparcV8DAGToDAGISel::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); } bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base, SDOperand &Offset) { if (FrameIndexSDNode *FIN = dyn_cast(Addr)) { Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); Offset = CurDAG->getTargetConstant(0, MVT::i32); return true; } if (Addr.getOpcode() == ISD::ADD) { if (ConstantSDNode *CN = dyn_cast(Addr.getOperand(1))) { if (Predicate_simm13(CN)) { if (FrameIndexSDNode *FIN = dyn_cast(Addr.getOperand(0))) { // Constant offset from frame ref. Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); } else { Base = Select(Addr.getOperand(0)); } Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32); return true; } } if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) { Base = Select(Addr.getOperand(1)); Offset = Addr.getOperand(0).getOperand(0); return true; } if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) { Base = Select(Addr.getOperand(0)); Offset = Addr.getOperand(1).getOperand(0); return true; } } Base = Select(Addr); Offset = CurDAG->getTargetConstant(0, MVT::i32); return true; } bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1, SDOperand &R2) { if (Addr.getOpcode() == ISD::FrameIndex) return false; if (Addr.getOpcode() == ISD::ADD) { if (isa(Addr.getOperand(1)) && Predicate_simm13(Addr.getOperand(1).Val)) return false; // Let the reg+imm pattern catch this! if (Addr.getOperand(0).getOpcode() == V8ISD::Lo || Addr.getOperand(1).getOpcode() == V8ISD::Lo) return false; // Let the reg+imm pattern catch this! R1 = Select(Addr.getOperand(0)); R2 = Select(Addr.getOperand(1)); return true; } R1 = Select(Addr); R2 = CurDAG->getRegister(V8::G0, MVT::i32); return true; } SDOperand SparcV8DAGToDAGISel::Select(SDOperand Op) { SDNode *N = Op.Val; if (N->getOpcode() >= ISD::BUILTIN_OP_END && N->getOpcode() < V8ISD::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::FrameIndex: { int FI = cast(N)->getIndex(); if (N->hasOneUse()) return CurDAG->SelectNodeTo(N, V8::ADDri, MVT::i32, CurDAG->getTargetFrameIndex(FI, MVT::i32), CurDAG->getTargetConstant(0, MVT::i32)); return CodeGenMap[Op] = CurDAG->getTargetNode(V8::ADDri, MVT::i32, CurDAG->getTargetFrameIndex(FI, MVT::i32), CurDAG->getTargetConstant(0, MVT::i32)); } case ISD::ADD_PARTS: { SDOperand LHSL = Select(N->getOperand(0)); SDOperand LHSH = Select(N->getOperand(1)); SDOperand RHSL = Select(N->getOperand(2)); SDOperand RHSH = Select(N->getOperand(3)); // FIXME, handle immediate RHS. SDOperand Low = CurDAG->getTargetNode(V8::ADDCCrr, MVT::i32, MVT::Flag, LHSL, RHSL); SDOperand Hi = CurDAG->getTargetNode(V8::ADDXrr, MVT::i32, LHSH, RHSH, Low.getValue(1)); CodeGenMap[SDOperand(N, 0)] = Low; CodeGenMap[SDOperand(N, 1)] = Hi; return Op.ResNo ? Hi : Low; } case ISD::SUB_PARTS: { SDOperand LHSL = Select(N->getOperand(0)); SDOperand LHSH = Select(N->getOperand(1)); SDOperand RHSL = Select(N->getOperand(2)); SDOperand RHSH = Select(N->getOperand(3)); // FIXME, handle immediate RHS. SDOperand Low = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag, LHSL, RHSL); SDOperand Hi = CurDAG->getTargetNode(V8::SUBXrr, MVT::i32, LHSH, RHSH, Low.getValue(1)); CodeGenMap[SDOperand(N, 0)] = Low; CodeGenMap[SDOperand(N, 1)] = Hi; return Op.ResNo ? Hi : Low; } case ISD::SDIV: case ISD::UDIV: { // FIXME: should use a custom expander to expose the SRA to the dag. SDOperand DivLHS = Select(N->getOperand(0)); SDOperand DivRHS = Select(N->getOperand(1)); // Set the Y register to the high-part. SDOperand TopPart; if (N->getOpcode() == ISD::SDIV) { TopPart = CurDAG->getTargetNode(V8::SRAri, MVT::i32, DivLHS, CurDAG->getTargetConstant(31, MVT::i32)); } else { TopPart = CurDAG->getRegister(V8::G0, MVT::i32); } TopPart = CurDAG->getTargetNode(V8::WRYrr, MVT::Flag, TopPart, CurDAG->getRegister(V8::G0, MVT::i32)); // FIXME: Handle div by immediate. unsigned Opcode = N->getOpcode() == ISD::SDIV ? V8::SDIVrr : V8::UDIVrr; return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, TopPart); } case ISD::MULHU: case ISD::MULHS: { // FIXME: Handle mul by immediate. SDOperand MulLHS = Select(N->getOperand(0)); SDOperand MulRHS = Select(N->getOperand(1)); unsigned Opcode = N->getOpcode() == ISD::MULHU ? V8::UMULrr : V8::SMULrr; SDOperand Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag, MulLHS, MulRHS); // The high part is in the Y register. return CurDAG->SelectNodeTo(N, V8::RDY, MVT::i32, Mul.getValue(1)); } case V8ISD::CALL: // FIXME: This is a workaround for a bug in tblgen. { // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag) // Emits: (CALL:void (tglobaladdr:i32):$dst) // Pattern complexity = 2 cost = 1 SDOperand N1 = N->getOperand(1); if (N1.getOpcode() != ISD::TargetGlobalAddress && N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail; SDOperand InFlag = SDOperand(0, 0); SDOperand Chain = N->getOperand(0); SDOperand Tmp0 = N1; Chain = Select(Chain); SDOperand Result; if (N->getNumOperands() == 3) { InFlag = Select(N->getOperand(2)); Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0, Chain, InFlag); } else { Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0, Chain); } Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0); CodeGenMap[SDOperand(N, 1)] = Result.getValue(1); return Result.getValue(Op.ResNo); } P47Fail:; } return SelectCode(Op); } /// createSparcV8ISelDag - This pass converts a legalized DAG into a /// SPARC-specific DAG, ready for instruction scheduling. /// FunctionPass *llvm::createSparcV8ISelDag(TargetMachine &TM) { return new SparcV8DAGToDAGISel(TM); }