//===-- SparcISelLowering.cpp - Sparc DAG Lowering Implementation ---------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the interfaces that Sparc uses to lower LLVM code into a // selection DAG. // //===----------------------------------------------------------------------===// #include "SparcISelLowering.h" #include "SparcMachineFunctionInfo.h" #include "SparcTargetMachine.h" #include "MCTargetDesc/SparcBaseInfo.h" #include "llvm/CodeGen/CallingConvLower.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/TargetLoweringObjectFileImpl.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" #include "llvm/IR/Module.h" #include "llvm/Support/ErrorHandling.h" using namespace llvm; //===----------------------------------------------------------------------===// // Calling Convention Implementation //===----------------------------------------------------------------------===// static bool CC_Sparc_Assign_SRet(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State) { assert (ArgFlags.isSRet()); //Assign SRet argument State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 0, LocVT, LocInfo)); return true; } static bool CC_Sparc_Assign_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State) { static const uint16_t RegList[] = { SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 }; //Try to get first reg if (unsigned Reg = State.AllocateReg(RegList, 6)) { State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); } else { //Assign whole thing in stack State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, State.AllocateStack(8,4), LocVT, LocInfo)); return true; } //Try to get second reg if (unsigned Reg = State.AllocateReg(RegList, 6)) State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); else State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, State.AllocateStack(4,4), LocVT, LocInfo)); return true; } // Allocate a full-sized argument for the 64-bit ABI. static bool CC_Sparc64_Full(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State) { assert((LocVT == MVT::f32 || LocVT.getSizeInBits() == 64) && "Can't handle non-64 bits locations"); // Stack space is allocated for all arguments starting from [%fp+BIAS+128]. unsigned Offset = State.AllocateStack(8, 8); unsigned Reg = 0; if (LocVT == MVT::i64 && Offset < 6*8) // Promote integers to %i0-%i5. Reg = SP::I0 + Offset/8; else if (LocVT == MVT::f64 && Offset < 16*8) // Promote doubles to %d0-%d30. (Which LLVM calls D0-D15). Reg = SP::D0 + Offset/8; else if (LocVT == MVT::f32 && Offset < 16*8) // Promote floats to %f1, %f3, ... Reg = SP::F1 + Offset/4; // Promote to register when possible, otherwise use the stack slot. if (Reg) { State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); return true; } // This argument goes on the stack in an 8-byte slot. // When passing floats, LocVT is smaller than 8 bytes. Adjust the offset to // the right-aligned float. The first 4 bytes of the stack slot are undefined. if (LocVT == MVT::f32) Offset += 4; State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); return true; } // Allocate a half-sized argument for the 64-bit ABI. // // This is used when passing { float, int } structs by value in registers. static bool CC_Sparc64_Half(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State) { assert(LocVT.getSizeInBits() == 32 && "Can't handle non-32 bits locations"); unsigned Offset = State.AllocateStack(4, 4); if (LocVT == MVT::f32 && Offset < 16*8) { // Promote floats to %f0-%f31. State.addLoc(CCValAssign::getReg(ValNo, ValVT, SP::F0 + Offset/4, LocVT, LocInfo)); return true; } if (LocVT == MVT::i32 && Offset < 6*8) { // Promote integers to %i0-%i5, using half the register. unsigned Reg = SP::I0 + Offset/8; LocVT = MVT::i64; LocInfo = CCValAssign::AExt; // Set the Custom bit if this i32 goes in the high bits of a register. if (Offset % 8 == 0) State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); else State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); return true; } State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); return true; } #include "SparcGenCallingConv.inc" // The calling conventions in SparcCallingConv.td are described in terms of the // callee's register window. This function translates registers to the // corresponding caller window %o register. static unsigned toCallerWindow(unsigned Reg) { assert(SP::I0 + 7 == SP::I7 && SP::O0 + 7 == SP::O7 && "Unexpected enum"); if (Reg >= SP::I0 && Reg <= SP::I7) return Reg - SP::I0 + SP::O0; return Reg; } SDValue SparcTargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Outs, const SmallVectorImpl &OutVals, DebugLoc DL, SelectionDAG &DAG) const { if (Subtarget->is64Bit()) return LowerReturn_64(Chain, CallConv, IsVarArg, Outs, OutVals, DL, DAG); return LowerReturn_32(Chain, CallConv, IsVarArg, Outs, OutVals, DL, DAG); } SDValue SparcTargetLowering::LowerReturn_32(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Outs, const SmallVectorImpl &OutVals, DebugLoc DL, SelectionDAG &DAG) const { MachineFunction &MF = DAG.getMachineFunction(); // CCValAssign - represent the assignment of the return value to locations. SmallVector RVLocs; // CCState - Info about the registers and stack slot. CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), DAG.getTarget(), RVLocs, *DAG.getContext()); // Analyze return values. CCInfo.AnalyzeReturn(Outs, RetCC_Sparc32); SDValue Flag; SmallVector RetOps(1, Chain); // Make room for the return address offset. RetOps.push_back(SDValue()); // Copy the result values into the output registers. for (unsigned i = 0; i != RVLocs.size(); ++i) { CCValAssign &VA = RVLocs[i]; assert(VA.isRegLoc() && "Can only return in registers!"); Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), OutVals[i], Flag); // Guarantee that all emitted copies are stuck together with flags. Flag = Chain.getValue(1); RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT())); } unsigned RetAddrOffset = 8; //Call Inst + Delay Slot // If the function returns a struct, copy the SRetReturnReg to I0 if (MF.getFunction()->hasStructRetAttr()) { SparcMachineFunctionInfo *SFI = MF.getInfo(); unsigned Reg = SFI->getSRetReturnReg(); if (!Reg) llvm_unreachable("sret virtual register not created in the entry block"); SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, getPointerTy()); Chain = DAG.getCopyToReg(Chain, DL, SP::I0, Val, Flag); Flag = Chain.getValue(1); RetOps.push_back(DAG.getRegister(SP::I0, getPointerTy())); RetAddrOffset = 12; // CallInst + Delay Slot + Unimp } RetOps[0] = Chain; // Update chain. RetOps[1] = DAG.getConstant(RetAddrOffset, MVT::i32); // Add the flag if we have it. if (Flag.getNode()) RetOps.push_back(Flag); return DAG.getNode(SPISD::RET_FLAG, DL, MVT::Other, &RetOps[0], RetOps.size()); } // Lower return values for the 64-bit ABI. // Return values are passed the exactly the same way as function arguments. SDValue SparcTargetLowering::LowerReturn_64(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Outs, const SmallVectorImpl &OutVals, DebugLoc DL, SelectionDAG &DAG) const { // CCValAssign - represent the assignment of the return value to locations. SmallVector RVLocs; // CCState - Info about the registers and stack slot. CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), DAG.getTarget(), RVLocs, *DAG.getContext()); // Analyze return values. CCInfo.AnalyzeReturn(Outs, CC_Sparc64); SDValue Flag; SmallVector RetOps(1, Chain); // The second operand on the return instruction is the return address offset. // The return address is always %i7+8 with the 64-bit ABI. RetOps.push_back(DAG.getConstant(8, MVT::i32)); // Copy the result values into the output registers. for (unsigned i = 0; i != RVLocs.size(); ++i) { CCValAssign &VA = RVLocs[i]; assert(VA.isRegLoc() && "Can only return in registers!"); SDValue OutVal = OutVals[i]; // Integer return values must be sign or zero extended by the callee. switch (VA.getLocInfo()) { case CCValAssign::SExt: OutVal = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), OutVal); break; case CCValAssign::ZExt: OutVal = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), OutVal); break; case CCValAssign::AExt: OutVal = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), OutVal); default: break; } // The custom bit on an i32 return value indicates that it should be passed // in the high bits of the register. if (VA.getValVT() == MVT::i32 && VA.needsCustom()) { OutVal = DAG.getNode(ISD::SHL, DL, MVT::i64, OutVal, DAG.getConstant(32, MVT::i32)); // The next value may go in the low bits of the same register. // Handle both at once. if (i+1 < RVLocs.size() && RVLocs[i+1].getLocReg() == VA.getLocReg()) { SDValue NV = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, OutVals[i+1]); OutVal = DAG.getNode(ISD::OR, DL, MVT::i64, OutVal, NV); // Skip the next value, it's already done. ++i; } } Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), OutVal, Flag); // Guarantee that all emitted copies are stuck together with flags. Flag = Chain.getValue(1); RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT())); } RetOps[0] = Chain; // Update chain. // Add the flag if we have it. if (Flag.getNode()) RetOps.push_back(Flag); return DAG.getNode(SPISD::RET_FLAG, DL, MVT::Other, &RetOps[0], RetOps.size()); } SDValue SparcTargetLowering:: LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Ins, DebugLoc DL, SelectionDAG &DAG, SmallVectorImpl &InVals) const { if (Subtarget->is64Bit()) return LowerFormalArguments_64(Chain, CallConv, IsVarArg, Ins, DL, DAG, InVals); return LowerFormalArguments_32(Chain, CallConv, IsVarArg, Ins, DL, DAG, InVals); } /// LowerFormalArguments32 - 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. SDValue SparcTargetLowering:: LowerFormalArguments_32(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) const { MachineFunction &MF = DAG.getMachineFunction(); MachineRegisterInfo &RegInfo = MF.getRegInfo(); SparcMachineFunctionInfo *FuncInfo = MF.getInfo(); // Assign locations to all of the incoming arguments. SmallVector ArgLocs; CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), getTargetMachine(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeFormalArguments(Ins, CC_Sparc32); const unsigned StackOffset = 92; for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { CCValAssign &VA = ArgLocs[i]; if (i == 0 && Ins[i].Flags.isSRet()) { //Get SRet from [%fp+64] int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, 64, true); SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); SDValue Arg = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, MachinePointerInfo(), false, false, false, 0); InVals.push_back(Arg); continue; } if (VA.isRegLoc()) { if (VA.needsCustom()) { assert(VA.getLocVT() == MVT::f64); unsigned VRegHi = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); MF.getRegInfo().addLiveIn(VA.getLocReg(), VRegHi); SDValue HiVal = DAG.getCopyFromReg(Chain, dl, VRegHi, MVT::i32); assert(i+1 < e); CCValAssign &NextVA = ArgLocs[++i]; SDValue LoVal; if (NextVA.isMemLoc()) { int FrameIdx = MF.getFrameInfo()-> CreateFixedObject(4, StackOffset+NextVA.getLocMemOffset(),true); SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); LoVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, MachinePointerInfo(), false, false, false, 0); } else { unsigned loReg = MF.addLiveIn(NextVA.getLocReg(), &SP::IntRegsRegClass); LoVal = DAG.getCopyFromReg(Chain, dl, loReg, MVT::i32); } SDValue WholeValue = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, LoVal, HiVal); WholeValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, WholeValue); InVals.push_back(WholeValue); continue; } unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); MF.getRegInfo().addLiveIn(VA.getLocReg(), VReg); SDValue Arg = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32); if (VA.getLocVT() == MVT::f32) Arg = DAG.getNode(ISD::BITCAST, dl, MVT::f32, Arg); else if (VA.getLocVT() != MVT::i32) { Arg = DAG.getNode(ISD::AssertSext, dl, MVT::i32, Arg, DAG.getValueType(VA.getLocVT())); Arg = DAG.getNode(ISD::TRUNCATE, dl, VA.getLocVT(), Arg); } InVals.push_back(Arg); continue; } assert(VA.isMemLoc()); unsigned Offset = VA.getLocMemOffset()+StackOffset; if (VA.needsCustom()) { assert(VA.getValVT() == MVT::f64); //If it is double-word aligned, just load. if (Offset % 8 == 0) { int FI = MF.getFrameInfo()->CreateFixedObject(8, Offset, true); SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); SDValue Load = DAG.getLoad(VA.getValVT(), dl, Chain, FIPtr, MachinePointerInfo(), false,false, false, 0); InVals.push_back(Load); continue; } int FI = MF.getFrameInfo()->CreateFixedObject(4, Offset, true); SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); SDValue HiVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, MachinePointerInfo(), false, false, false, 0); int FI2 = MF.getFrameInfo()->CreateFixedObject(4, Offset+4, true); SDValue FIPtr2 = DAG.getFrameIndex(FI2, getPointerTy()); SDValue LoVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr2, MachinePointerInfo(), false, false, false, 0); SDValue WholeValue = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, LoVal, HiVal); WholeValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, WholeValue); InVals.push_back(WholeValue); continue; } int FI = MF.getFrameInfo()->CreateFixedObject(4, Offset, true); SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); SDValue Load ; if (VA.getValVT() == MVT::i32 || VA.getValVT() == MVT::f32) { Load = DAG.getLoad(VA.getValVT(), dl, Chain, FIPtr, MachinePointerInfo(), false, false, false, 0); } else { ISD::LoadExtType LoadOp = ISD::SEXTLOAD; // Sparc is big endian, so add an offset based on the ObjectVT. unsigned Offset = 4-std::max(1U, VA.getValVT().getSizeInBits()/8); FIPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, FIPtr, DAG.getConstant(Offset, MVT::i32)); Load = DAG.getExtLoad(LoadOp, dl, MVT::i32, Chain, FIPtr, MachinePointerInfo(), VA.getValVT(), false, false,0); Load = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Load); } InVals.push_back(Load); } if (MF.getFunction()->hasStructRetAttr()) { //Copy the SRet Argument to SRetReturnReg SparcMachineFunctionInfo *SFI = MF.getInfo(); unsigned Reg = SFI->getSRetReturnReg(); if (!Reg) { Reg = MF.getRegInfo().createVirtualRegister(&SP::IntRegsRegClass); SFI->setSRetReturnReg(Reg); } SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[0]); Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain); } // Store remaining ArgRegs to the stack if this is a varargs function. if (isVarArg) { static const uint16_t ArgRegs[] = { SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 }; unsigned NumAllocated = CCInfo.getFirstUnallocated(ArgRegs, 6); const uint16_t *CurArgReg = ArgRegs+NumAllocated, *ArgRegEnd = ArgRegs+6; unsigned ArgOffset = CCInfo.getNextStackOffset(); if (NumAllocated == 6) ArgOffset += StackOffset; else { assert(!ArgOffset); ArgOffset = 68+4*NumAllocated; } // Remember the vararg offset for the va_start implementation. FuncInfo->setVarArgsFrameOffset(ArgOffset); std::vector OutChains; for (; CurArgReg != ArgRegEnd; ++CurArgReg) { unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); MF.getRegInfo().addLiveIn(*CurArgReg, VReg); SDValue Arg = DAG.getCopyFromReg(DAG.getRoot(), dl, VReg, MVT::i32); int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset, true); SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); OutChains.push_back(DAG.getStore(DAG.getRoot(), dl, Arg, FIPtr, MachinePointerInfo(), false, false, 0)); ArgOffset += 4; } if (!OutChains.empty()) { OutChains.push_back(Chain); Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &OutChains[0], OutChains.size()); } } return Chain; } // Lower formal arguments for the 64 bit ABI. SDValue SparcTargetLowering:: LowerFormalArguments_64(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Ins, DebugLoc DL, SelectionDAG &DAG, SmallVectorImpl &InVals) const { MachineFunction &MF = DAG.getMachineFunction(); // Analyze arguments according to CC_Sparc64. SmallVector ArgLocs; CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), getTargetMachine(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeFormalArguments(Ins, CC_Sparc64); // The argument array begins at %fp+BIAS+128, after the register save area. const unsigned ArgArea = 128; for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { CCValAssign &VA = ArgLocs[i]; if (VA.isRegLoc()) { // This argument is passed in a register. // All integer register arguments are promoted by the caller to i64. // Create a virtual register for the promoted live-in value. unsigned VReg = MF.addLiveIn(VA.getLocReg(), getRegClassFor(VA.getLocVT())); SDValue Arg = DAG.getCopyFromReg(Chain, DL, VReg, VA.getLocVT()); // Get the high bits for i32 struct elements. if (VA.getValVT() == MVT::i32 && VA.needsCustom()) Arg = DAG.getNode(ISD::SRL, DL, VA.getLocVT(), Arg, DAG.getConstant(32, MVT::i32)); // The caller promoted the argument, so insert an Assert?ext SDNode so we // won't promote the value again in this function. switch (VA.getLocInfo()) { case CCValAssign::SExt: Arg = DAG.getNode(ISD::AssertSext, DL, VA.getLocVT(), Arg, DAG.getValueType(VA.getValVT())); break; case CCValAssign::ZExt: Arg = DAG.getNode(ISD::AssertZext, DL, VA.getLocVT(), Arg, DAG.getValueType(VA.getValVT())); break; default: break; } // Truncate the register down to the argument type. if (VA.isExtInLoc()) Arg = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Arg); InVals.push_back(Arg); continue; } // The registers are exhausted. This argument was passed on the stack. assert(VA.isMemLoc()); // The CC_Sparc64_Full/Half functions compute stack offsets relative to the // beginning of the arguments area at %fp+BIAS+128. unsigned Offset = VA.getLocMemOffset() + ArgArea; unsigned ValSize = VA.getValVT().getSizeInBits() / 8; // Adjust offset for extended arguments, SPARC is big-endian. // The caller will have written the full slot with extended bytes, but we // prefer our own extending loads. if (VA.isExtInLoc()) Offset += 8 - ValSize; int FI = MF.getFrameInfo()->CreateFixedObject(ValSize, Offset, true); InVals.push_back(DAG.getLoad(VA.getValVT(), DL, Chain, DAG.getFrameIndex(FI, getPointerTy()), MachinePointerInfo::getFixedStack(FI), false, false, false, 0)); } if (!IsVarArg) return Chain; // This function takes variable arguments, some of which may have been passed // in registers %i0-%i5. Variable floating point arguments are never passed // in floating point registers. They go on %i0-%i5 or on the stack like // integer arguments. // // The va_start intrinsic needs to know the offset to the first variable // argument. unsigned ArgOffset = CCInfo.getNextStackOffset(); SparcMachineFunctionInfo *FuncInfo = MF.getInfo(); // Skip the 128 bytes of register save area. FuncInfo->setVarArgsFrameOffset(ArgOffset + ArgArea + Subtarget->getStackPointerBias()); // Save the variable arguments that were passed in registers. // The caller is required to reserve stack space for 6 arguments regardless // of how many arguments were actually passed. SmallVector OutChains; for (; ArgOffset < 6*8; ArgOffset += 8) { unsigned VReg = MF.addLiveIn(SP::I0 + ArgOffset/8, &SP::I64RegsRegClass); SDValue VArg = DAG.getCopyFromReg(Chain, DL, VReg, MVT::i64); int FI = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset + ArgArea, true); OutChains.push_back(DAG.getStore(Chain, DL, VArg, DAG.getFrameIndex(FI, getPointerTy()), MachinePointerInfo::getFixedStack(FI), false, false, 0)); } if (!OutChains.empty()) Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, &OutChains[0], OutChains.size()); return Chain; } SDValue SparcTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, SmallVectorImpl &InVals) const { if (Subtarget->is64Bit()) return LowerCall_64(CLI, InVals); return LowerCall_32(CLI, InVals); } // Lower a call for the 32-bit ABI. SDValue SparcTargetLowering::LowerCall_32(TargetLowering::CallLoweringInfo &CLI, SmallVectorImpl &InVals) const { SelectionDAG &DAG = CLI.DAG; DebugLoc &dl = CLI.DL; SmallVector &Outs = CLI.Outs; SmallVector &OutVals = CLI.OutVals; SmallVector &Ins = CLI.Ins; SDValue Chain = CLI.Chain; SDValue Callee = CLI.Callee; bool &isTailCall = CLI.IsTailCall; CallingConv::ID CallConv = CLI.CallConv; bool isVarArg = CLI.IsVarArg; // Sparc target does not yet support tail call optimization. isTailCall = false; // Analyze operands of the call, assigning locations to each operand. SmallVector ArgLocs; CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), DAG.getTarget(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeCallOperands(Outs, CC_Sparc32); // Get the size of the outgoing arguments stack space requirement. unsigned ArgsSize = CCInfo.getNextStackOffset(); // Keep stack frames 8-byte aligned. ArgsSize = (ArgsSize+7) & ~7; MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); //Create local copies for byval args. SmallVector ByValArgs; for (unsigned i = 0, e = Outs.size(); i != e; ++i) { ISD::ArgFlagsTy Flags = Outs[i].Flags; if (!Flags.isByVal()) continue; SDValue Arg = OutVals[i]; unsigned Size = Flags.getByValSize(); unsigned Align = Flags.getByValAlign(); int FI = MFI->CreateStackObject(Size, Align, false); SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); SDValue SizeNode = DAG.getConstant(Size, MVT::i32); Chain = DAG.getMemcpy(Chain, dl, FIPtr, Arg, SizeNode, Align, false, //isVolatile, (Size <= 32), //AlwaysInline if size <= 32 MachinePointerInfo(), MachinePointerInfo()); ByValArgs.push_back(FIPtr); } Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(ArgsSize, true)); SmallVector, 8> RegsToPass; SmallVector MemOpChains; const unsigned StackOffset = 92; bool hasStructRetAttr = false; // Walk the register/memloc assignments, inserting copies/loads. for (unsigned i = 0, realArgIdx = 0, byvalArgIdx = 0, e = ArgLocs.size(); i != e; ++i, ++realArgIdx) { CCValAssign &VA = ArgLocs[i]; SDValue Arg = OutVals[realArgIdx]; ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags; //Use local copy if it is a byval arg. if (Flags.isByVal()) Arg = ByValArgs[byvalArgIdx++]; // Promote the value if needed. switch (VA.getLocInfo()) { default: llvm_unreachable("Unknown loc info!"); case CCValAssign::Full: break; case CCValAssign::SExt: Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); break; case CCValAssign::ZExt: Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); break; case CCValAssign::AExt: Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); break; case CCValAssign::BCvt: Arg = DAG.getNode(ISD::BITCAST, dl, VA.getLocVT(), Arg); break; } if (Flags.isSRet()) { assert(VA.needsCustom()); // store SRet argument in %sp+64 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); SDValue PtrOff = DAG.getIntPtrConstant(64); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(), false, false, 0)); hasStructRetAttr = true; continue; } if (VA.needsCustom()) { assert(VA.getLocVT() == MVT::f64); if (VA.isMemLoc()) { unsigned Offset = VA.getLocMemOffset() + StackOffset; //if it is double-word aligned, just store. if (Offset % 8 == 0) { SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); SDValue PtrOff = DAG.getIntPtrConstant(Offset); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(), false, false, 0)); continue; } } SDValue StackPtr = DAG.CreateStackTemporary(MVT::f64, MVT::i32); SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Arg, StackPtr, MachinePointerInfo(), false, false, 0); // Sparc is big-endian, so the high part comes first. SDValue Hi = DAG.getLoad(MVT::i32, dl, Store, StackPtr, MachinePointerInfo(), false, false, false, 0); // Increment the pointer to the other half. StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr, DAG.getIntPtrConstant(4)); // Load the low part. SDValue Lo = DAG.getLoad(MVT::i32, dl, Store, StackPtr, MachinePointerInfo(), false, false, false, 0); if (VA.isRegLoc()) { RegsToPass.push_back(std::make_pair(VA.getLocReg(), Hi)); assert(i+1 != e); CCValAssign &NextVA = ArgLocs[++i]; if (NextVA.isRegLoc()) { RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), Lo)); } else { //Store the low part in stack. unsigned Offset = NextVA.getLocMemOffset() + StackOffset; SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); SDValue PtrOff = DAG.getIntPtrConstant(Offset); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Lo, PtrOff, MachinePointerInfo(), false, false, 0)); } } else { unsigned Offset = VA.getLocMemOffset() + StackOffset; // Store the high part. SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); SDValue PtrOff = DAG.getIntPtrConstant(Offset); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Hi, PtrOff, MachinePointerInfo(), false, false, 0)); // Store the low part. PtrOff = DAG.getIntPtrConstant(Offset+4); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Lo, PtrOff, MachinePointerInfo(), false, false, 0)); } continue; } // Arguments that can be passed on register must be kept at // RegsToPass vector if (VA.isRegLoc()) { if (VA.getLocVT() != MVT::f32) { RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); continue; } Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg); RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); continue; } assert(VA.isMemLoc()); // Create a store off the stack pointer for this argument. SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); SDValue PtrOff = DAG.getIntPtrConstant(VA.getLocMemOffset()+StackOffset); PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(), false, false, 0)); } // Emit all stores, make sure the occur before any copies into physregs. if (!MemOpChains.empty()) Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOpChains[0], MemOpChains.size()); // Build a sequence of copy-to-reg nodes chained together with token // chain and flag operands which copy the outgoing args into registers. // The InFlag in necessary since all emitted instructions must be // stuck together. SDValue InFlag; for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { unsigned Reg = toCallerWindow(RegsToPass[i].first); Chain = DAG.getCopyToReg(Chain, dl, Reg, RegsToPass[i].second, InFlag); InFlag = Chain.getValue(1); } unsigned SRetArgSize = (hasStructRetAttr)? getSRetArgSize(DAG, Callee):0; // 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. // Likewise ExternalSymbol -> TargetExternalSymbol. if (GlobalAddressSDNode *G = dyn_cast(Callee)) Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i32); else if (ExternalSymbolSDNode *E = dyn_cast(Callee)) Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32); // Returns a chain & a flag for retval copy to use SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); SmallVector Ops; Ops.push_back(Chain); Ops.push_back(Callee); if (hasStructRetAttr) Ops.push_back(DAG.getTargetConstant(SRetArgSize, MVT::i32)); for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) Ops.push_back(DAG.getRegister(toCallerWindow(RegsToPass[i].first), RegsToPass[i].second.getValueType())); if (InFlag.getNode()) Ops.push_back(InFlag); Chain = DAG.getNode(SPISD::CALL, dl, NodeTys, &Ops[0], Ops.size()); InFlag = Chain.getValue(1); Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(ArgsSize, true), DAG.getIntPtrConstant(0, true), InFlag); InFlag = Chain.getValue(1); // Assign locations to each value returned by this call. SmallVector RVLocs; CCState RVInfo(CallConv, isVarArg, DAG.getMachineFunction(), DAG.getTarget(), RVLocs, *DAG.getContext()); RVInfo.AnalyzeCallResult(Ins, RetCC_Sparc32); // Copy all of the result registers out of their specified physreg. for (unsigned i = 0; i != RVLocs.size(); ++i) { Chain = DAG.getCopyFromReg(Chain, dl, toCallerWindow(RVLocs[i].getLocReg()), RVLocs[i].getValVT(), InFlag).getValue(1); InFlag = Chain.getValue(2); InVals.push_back(Chain.getValue(0)); } return Chain; } unsigned SparcTargetLowering::getSRetArgSize(SelectionDAG &DAG, SDValue Callee) const { const Function *CalleeFn = 0; if (GlobalAddressSDNode *G = dyn_cast(Callee)) { CalleeFn = dyn_cast(G->getGlobal()); } else if (ExternalSymbolSDNode *E = dyn_cast(Callee)) { const Function *Fn = DAG.getMachineFunction().getFunction(); const Module *M = Fn->getParent(); CalleeFn = M->getFunction(E->getSymbol()); } if (!CalleeFn) return 0; assert(CalleeFn->hasStructRetAttr() && "Callee does not have the StructRet attribute."); PointerType *Ty = cast(CalleeFn->arg_begin()->getType()); Type *ElementTy = Ty->getElementType(); return getDataLayout()->getTypeAllocSize(ElementTy); } // Fixup floating point arguments in the ... part of a varargs call. // // The SPARC v9 ABI requires that floating point arguments are treated the same // as integers when calling a varargs function. This does not apply to the // fixed arguments that are part of the function's prototype. // // This function post-processes a CCValAssign array created by // AnalyzeCallOperands(). static void fixupVariableFloatArgs(SmallVectorImpl &ArgLocs, ArrayRef Outs) { for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { const CCValAssign &VA = ArgLocs[i]; // FIXME: What about f32 arguments? C promotes them to f64 when calling // varargs functions. if (!VA.isRegLoc() || VA.getLocVT() != MVT::f64) continue; // The fixed arguments to a varargs function still go in FP registers. if (Outs[VA.getValNo()].IsFixed) continue; // This floating point argument should be reassigned. CCValAssign NewVA; // Determine the offset into the argument array. unsigned Offset = 8 * (VA.getLocReg() - SP::D0); assert(Offset < 16*8 && "Offset out of range, bad register enum?"); if (Offset < 6*8) { // This argument should go in %i0-%i5. unsigned IReg = SP::I0 + Offset/8; // Full register, just bitconvert into i64. NewVA = CCValAssign::getReg(VA.getValNo(), VA.getValVT(), IReg, MVT::i64, CCValAssign::BCvt); } else { // This needs to go to memory, we're out of integer registers. NewVA = CCValAssign::getMem(VA.getValNo(), VA.getValVT(), Offset, VA.getLocVT(), VA.getLocInfo()); } ArgLocs[i] = NewVA; } } // Lower a call for the 64-bit ABI. SDValue SparcTargetLowering::LowerCall_64(TargetLowering::CallLoweringInfo &CLI, SmallVectorImpl &InVals) const { SelectionDAG &DAG = CLI.DAG; DebugLoc DL = CLI.DL; SDValue Chain = CLI.Chain; // Analyze operands of the call, assigning locations to each operand. SmallVector ArgLocs; CCState CCInfo(CLI.CallConv, CLI.IsVarArg, DAG.getMachineFunction(), DAG.getTarget(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeCallOperands(CLI.Outs, CC_Sparc64); // Get the size of the outgoing arguments stack space requirement. // The stack offset computed by CC_Sparc64 includes all arguments. // Called functions expect 6 argument words to exist in the stack frame, used // or not. unsigned ArgsSize = std::max(6*8u, CCInfo.getNextStackOffset()); // Keep stack frames 16-byte aligned. ArgsSize = RoundUpToAlignment(ArgsSize, 16); // Varargs calls require special treatment. if (CLI.IsVarArg) fixupVariableFloatArgs(ArgLocs, CLI.Outs); // Adjust the stack pointer to make room for the arguments. // FIXME: Use hasReservedCallFrame to avoid %sp adjustments around all calls // with more than 6 arguments. Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(ArgsSize, true)); // Collect the set of registers to pass to the function and their values. // This will be emitted as a sequence of CopyToReg nodes glued to the call // instruction. SmallVector, 8> RegsToPass; // Collect chains from all the memory opeations that copy arguments to the // stack. They must follow the stack pointer adjustment above and precede the // call instruction itself. SmallVector MemOpChains; for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { const CCValAssign &VA = ArgLocs[i]; SDValue Arg = CLI.OutVals[i]; // Promote the value if needed. switch (VA.getLocInfo()) { default: llvm_unreachable("Unknown location info!"); case CCValAssign::Full: break; case CCValAssign::SExt: Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Arg); break; case CCValAssign::ZExt: Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg); break; case CCValAssign::AExt: Arg = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Arg); break; case CCValAssign::BCvt: Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg); break; } if (VA.isRegLoc()) { // The custom bit on an i32 return value indicates that it should be // passed in the high bits of the register. if (VA.getValVT() == MVT::i32 && VA.needsCustom()) { Arg = DAG.getNode(ISD::SHL, DL, MVT::i64, Arg, DAG.getConstant(32, MVT::i32)); // The next value may go in the low bits of the same register. // Handle both at once. if (i+1 < ArgLocs.size() && ArgLocs[i+1].isRegLoc() && ArgLocs[i+1].getLocReg() == VA.getLocReg()) { SDValue NV = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, CLI.OutVals[i+1]); Arg = DAG.getNode(ISD::OR, DL, MVT::i64, Arg, NV); // Skip the next value, it's already done. ++i; } } RegsToPass.push_back(std::make_pair(toCallerWindow(VA.getLocReg()), Arg)); continue; } assert(VA.isMemLoc()); // Create a store off the stack pointer for this argument. SDValue StackPtr = DAG.getRegister(SP::O6, getPointerTy()); // The argument area starts at %fp+BIAS+128 in the callee frame, // %sp+BIAS+128 in ours. SDValue PtrOff = DAG.getIntPtrConstant(VA.getLocMemOffset() + Subtarget->getStackPointerBias() + 128); PtrOff = DAG.getNode(ISD::ADD, DL, getPointerTy(), StackPtr, PtrOff); MemOpChains.push_back(DAG.getStore(Chain, DL, Arg, PtrOff, MachinePointerInfo(), false, false, 0)); } // Emit all stores, make sure they occur before the call. if (!MemOpChains.empty()) Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, &MemOpChains[0], MemOpChains.size()); // Build a sequence of CopyToReg nodes glued together with token chain and // glue operands which copy the outgoing args into registers. The InGlue is // necessary since all emitted instructions must be stuck together in order // to pass the live physical registers. SDValue InGlue; for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { Chain = DAG.getCopyToReg(Chain, DL, RegsToPass[i].first, RegsToPass[i].second, InGlue); InGlue = 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. // Likewise ExternalSymbol -> TargetExternalSymbol. SDValue Callee = CLI.Callee; if (GlobalAddressSDNode *G = dyn_cast(Callee)) Callee = DAG.getTargetGlobalAddress(G->getGlobal(), DL, getPointerTy()); else if (ExternalSymbolSDNode *E = dyn_cast(Callee)) Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy()); // Build the operands for the call instruction itself. SmallVector Ops; Ops.push_back(Chain); Ops.push_back(Callee); for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) Ops.push_back(DAG.getRegister(RegsToPass[i].first, RegsToPass[i].second.getValueType())); // Make sure the CopyToReg nodes are glued to the call instruction which // consumes the registers. if (InGlue.getNode()) Ops.push_back(InGlue); // Now the call itself. SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); Chain = DAG.getNode(SPISD::CALL, DL, NodeTys, &Ops[0], Ops.size()); InGlue = Chain.getValue(1); // Revert the stack pointer immediately after the call. Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(ArgsSize, true), DAG.getIntPtrConstant(0, true), InGlue); InGlue = Chain.getValue(1); // Now extract the return values. This is more or less the same as // LowerFormalArguments_64. // Assign locations to each value returned by this call. SmallVector RVLocs; CCState RVInfo(CLI.CallConv, CLI.IsVarArg, DAG.getMachineFunction(), DAG.getTarget(), RVLocs, *DAG.getContext()); RVInfo.AnalyzeCallResult(CLI.Ins, CC_Sparc64); // Copy all of the result registers out of their specified physreg. for (unsigned i = 0; i != RVLocs.size(); ++i) { CCValAssign &VA = RVLocs[i]; unsigned Reg = toCallerWindow(VA.getLocReg()); // When returning 'inreg {i32, i32 }', two consecutive i32 arguments can // reside in the same register in the high and low bits. Reuse the // CopyFromReg previous node to avoid duplicate copies. SDValue RV; if (RegisterSDNode *SrcReg = dyn_cast(Chain.getOperand(1))) if (SrcReg->getReg() == Reg && Chain->getOpcode() == ISD::CopyFromReg) RV = Chain.getValue(0); // But usually we'll create a new CopyFromReg for a different register. if (!RV.getNode()) { RV = DAG.getCopyFromReg(Chain, DL, Reg, RVLocs[i].getLocVT(), InGlue); Chain = RV.getValue(1); InGlue = Chain.getValue(2); } // Get the high bits for i32 struct elements. if (VA.getValVT() == MVT::i32 && VA.needsCustom()) RV = DAG.getNode(ISD::SRL, DL, VA.getLocVT(), RV, DAG.getConstant(32, MVT::i32)); // The callee promoted the return value, so insert an Assert?ext SDNode so // we won't promote the value again in this function. switch (VA.getLocInfo()) { case CCValAssign::SExt: RV = DAG.getNode(ISD::AssertSext, DL, VA.getLocVT(), RV, DAG.getValueType(VA.getValVT())); break; case CCValAssign::ZExt: RV = DAG.getNode(ISD::AssertZext, DL, VA.getLocVT(), RV, DAG.getValueType(VA.getValVT())); break; default: break; } // Truncate the register down to the return value type. if (VA.isExtInLoc()) RV = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), RV); InVals.push_back(RV); } return Chain; } //===----------------------------------------------------------------------===// // TargetLowering Implementation //===----------------------------------------------------------------------===// /// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC /// condition. static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) { switch (CC) { default: llvm_unreachable("Unknown integer condition code!"); case ISD::SETEQ: return SPCC::ICC_E; case ISD::SETNE: return SPCC::ICC_NE; case ISD::SETLT: return SPCC::ICC_L; case ISD::SETGT: return SPCC::ICC_G; case ISD::SETLE: return SPCC::ICC_LE; case ISD::SETGE: return SPCC::ICC_GE; case ISD::SETULT: return SPCC::ICC_CS; case ISD::SETULE: return SPCC::ICC_LEU; case ISD::SETUGT: return SPCC::ICC_GU; case ISD::SETUGE: return SPCC::ICC_CC; } } /// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC /// FCC condition. static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) { switch (CC) { default: llvm_unreachable("Unknown fp condition code!"); case ISD::SETEQ: case ISD::SETOEQ: return SPCC::FCC_E; case ISD::SETNE: case ISD::SETUNE: return SPCC::FCC_NE; case ISD::SETLT: case ISD::SETOLT: return SPCC::FCC_L; case ISD::SETGT: case ISD::SETOGT: return SPCC::FCC_G; case ISD::SETLE: case ISD::SETOLE: return SPCC::FCC_LE; case ISD::SETGE: case ISD::SETOGE: return SPCC::FCC_GE; case ISD::SETULT: return SPCC::FCC_UL; case ISD::SETULE: return SPCC::FCC_ULE; case ISD::SETUGT: return SPCC::FCC_UG; case ISD::SETUGE: return SPCC::FCC_UGE; case ISD::SETUO: return SPCC::FCC_U; case ISD::SETO: return SPCC::FCC_O; case ISD::SETONE: return SPCC::FCC_LG; case ISD::SETUEQ: return SPCC::FCC_UE; } } SparcTargetLowering::SparcTargetLowering(TargetMachine &TM) : TargetLowering(TM, new TargetLoweringObjectFileELF()) { Subtarget = &TM.getSubtarget(); // Set up the register classes. addRegisterClass(MVT::i32, &SP::IntRegsRegClass); addRegisterClass(MVT::f32, &SP::FPRegsRegClass); addRegisterClass(MVT::f64, &SP::DFPRegsRegClass); if (Subtarget->is64Bit()) addRegisterClass(MVT::i64, &SP::I64RegsRegClass); // Turn FP extload into load/fextend setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand); // Sparc doesn't have i1 sign extending load setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); // Turn FP truncstore into trunc + store. setTruncStoreAction(MVT::f64, MVT::f32, Expand); // Custom legalize GlobalAddress nodes into LO/HI parts. setOperationAction(ISD::GlobalAddress, getPointerTy(), Custom); setOperationAction(ISD::GlobalTLSAddress, getPointerTy(), Custom); setOperationAction(ISD::ConstantPool, getPointerTy(), 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 or DIVREM operations. setOperationAction(ISD::UREM, MVT::i32, Expand); setOperationAction(ISD::SREM, MVT::i32, Expand); setOperationAction(ISD::SDIVREM, MVT::i32, Expand); setOperationAction(ISD::UDIVREM, 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::BITCAST, MVT::f32, Expand); setOperationAction(ISD::BITCAST, MVT::i32, 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::BRIND, MVT::Other, Expand); setOperationAction(ISD::BR_JT, 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); if (Subtarget->is64Bit()) { setOperationAction(ISD::BR_CC, MVT::i64, Custom); setOperationAction(ISD::SELECT_CC, MVT::i64, Custom); } // FIXME: There are instructions available for ATOMIC_FENCE // on SparcV8 and later. setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand); setOperationAction(ISD::FSIN , MVT::f64, Expand); setOperationAction(ISD::FCOS , MVT::f64, Expand); setOperationAction(ISD::FSINCOS, MVT::f64, Expand); setOperationAction(ISD::FREM , MVT::f64, Expand); setOperationAction(ISD::FMA , MVT::f64, Expand); setOperationAction(ISD::FSIN , MVT::f32, Expand); setOperationAction(ISD::FCOS , MVT::f32, Expand); setOperationAction(ISD::FSINCOS, MVT::f32, Expand); setOperationAction(ISD::FREM , MVT::f32, Expand); setOperationAction(ISD::FMA , MVT::f32, Expand); setOperationAction(ISD::CTPOP, MVT::i32, Expand); setOperationAction(ISD::CTTZ , MVT::i32, Expand); setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand); setOperationAction(ISD::CTLZ , MVT::i32, Expand); setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand); setOperationAction(ISD::ROTL , MVT::i32, Expand); setOperationAction(ISD::ROTR , MVT::i32, Expand); setOperationAction(ISD::BSWAP, MVT::i32, Expand); setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand); setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand); setOperationAction(ISD::FPOW , MVT::f64, Expand); setOperationAction(ISD::FPOW , MVT::f32, Expand); setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); // FIXME: Sparc provides these multiplies, but we don't have them yet. setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand); setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand); setOperationAction(ISD::EH_LABEL, MVT::Other, Expand); // VASTART needs to be custom lowered to use the VarArgsFrameIndex. setOperationAction(ISD::VASTART , MVT::Other, Custom); // VAARG needs to be lowered to not do unaligned accesses for doubles. setOperationAction(ISD::VAARG , MVT::Other, Custom); // Use the default implementation. 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 , Custom); // No debug info support yet. setOperationAction(ISD::EH_LABEL, MVT::Other, Expand); setStackPointerRegisterToSaveRestore(SP::O6); if (TM.getSubtarget().isV9()) setOperationAction(ISD::CTPOP, MVT::i32, Legal); setMinFunctionAlignment(2); computeRegisterProperties(); } const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const { switch (Opcode) { default: return 0; case SPISD::CMPICC: return "SPISD::CMPICC"; case SPISD::CMPFCC: return "SPISD::CMPFCC"; case SPISD::BRICC: return "SPISD::BRICC"; case SPISD::BRXCC: return "SPISD::BRXCC"; case SPISD::BRFCC: return "SPISD::BRFCC"; case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC"; case SPISD::SELECT_XCC: return "SPISD::SELECT_XCC"; case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC"; case SPISD::Hi: return "SPISD::Hi"; case SPISD::Lo: return "SPISD::Lo"; case SPISD::FTOI: return "SPISD::FTOI"; case SPISD::ITOF: return "SPISD::ITOF"; case SPISD::CALL: return "SPISD::CALL"; case SPISD::RET_FLAG: return "SPISD::RET_FLAG"; case SPISD::GLOBAL_BASE_REG: return "SPISD::GLOBAL_BASE_REG"; case SPISD::FLUSHW: return "SPISD::FLUSHW"; } } /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to /// be zero. Op is expected to be a target specific node. Used by DAG /// combiner. void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, APInt &KnownZero, APInt &KnownOne, const SelectionDAG &DAG, unsigned Depth) const { APInt KnownZero2, KnownOne2; KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0); switch (Op.getOpcode()) { default: break; case SPISD::SELECT_ICC: case SPISD::SELECT_XCC: case SPISD::SELECT_FCC: DAG.ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); DAG.ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); // Only known if known in both the LHS and RHS. KnownOne &= KnownOne2; KnownZero &= KnownZero2; break; } } // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition. static void LookThroughSetCC(SDValue &LHS, SDValue &RHS, ISD::CondCode CC, unsigned &SPCC) { if (isa(RHS) && cast(RHS)->isNullValue() && CC == ISD::SETNE && (((LHS.getOpcode() == SPISD::SELECT_ICC || LHS.getOpcode() == SPISD::SELECT_XCC) && LHS.getOperand(3).getOpcode() == SPISD::CMPICC) || (LHS.getOpcode() == SPISD::SELECT_FCC && LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) && isa(LHS.getOperand(0)) && isa(LHS.getOperand(1)) && cast(LHS.getOperand(0))->isOne() && cast(LHS.getOperand(1))->isNullValue()) { SDValue CMPCC = LHS.getOperand(3); SPCC = cast(LHS.getOperand(2))->getZExtValue(); LHS = CMPCC.getOperand(0); RHS = CMPCC.getOperand(1); } } // Convert to a target node and set target flags. SDValue SparcTargetLowering::withTargetFlags(SDValue Op, unsigned TF, SelectionDAG &DAG) const { if (const GlobalAddressSDNode *GA = dyn_cast(Op)) return DAG.getTargetGlobalAddress(GA->getGlobal(), GA->getDebugLoc(), GA->getValueType(0), GA->getOffset(), TF); if (const ConstantPoolSDNode *CP = dyn_cast(Op)) return DAG.getTargetConstantPool(CP->getConstVal(), CP->getValueType(0), CP->getAlignment(), CP->getOffset(), TF); if (const ExternalSymbolSDNode *ES = dyn_cast(Op)) return DAG.getTargetExternalSymbol(ES->getSymbol(), ES->getValueType(0), TF); llvm_unreachable("Unhandled address SDNode"); } // Split Op into high and low parts according to HiTF and LoTF. // Return an ADD node combining the parts. SDValue SparcTargetLowering::makeHiLoPair(SDValue Op, unsigned HiTF, unsigned LoTF, SelectionDAG &DAG) const { DebugLoc DL = Op.getDebugLoc(); EVT VT = Op.getValueType(); SDValue Hi = DAG.getNode(SPISD::Hi, DL, VT, withTargetFlags(Op, HiTF, DAG)); SDValue Lo = DAG.getNode(SPISD::Lo, DL, VT, withTargetFlags(Op, LoTF, DAG)); return DAG.getNode(ISD::ADD, DL, VT, Hi, Lo); } // Build SDNodes for producing an address from a GlobalAddress, ConstantPool, // or ExternalSymbol SDNode. SDValue SparcTargetLowering::makeAddress(SDValue Op, SelectionDAG &DAG) const { DebugLoc DL = Op.getDebugLoc(); EVT VT = getPointerTy(); // Handle PIC mode first. if (getTargetMachine().getRelocationModel() == Reloc::PIC_) { // This is the pic32 code model, the GOT is known to be smaller than 4GB. SDValue HiLo = makeHiLoPair(Op, SPII::MO_HI, SPII::MO_LO, DAG); SDValue GlobalBase = DAG.getNode(SPISD::GLOBAL_BASE_REG, DL, VT); SDValue AbsAddr = DAG.getNode(ISD::ADD, DL, VT, GlobalBase, HiLo); return DAG.getLoad(VT, DL, DAG.getEntryNode(), AbsAddr, MachinePointerInfo::getGOT(), false, false, false, 0); } // This is one of the absolute code models. switch(getTargetMachine().getCodeModel()) { default: llvm_unreachable("Unsupported absolute code model"); case CodeModel::Small: // abs32. return makeHiLoPair(Op, SPII::MO_HI, SPII::MO_LO, DAG); case CodeModel::Medium: { // abs44. SDValue H44 = makeHiLoPair(Op, SPII::MO_H44, SPII::MO_M44, DAG); H44 = DAG.getNode(ISD::SHL, DL, VT, H44, DAG.getConstant(12, MVT::i32)); SDValue L44 = withTargetFlags(Op, SPII::MO_L44, DAG); L44 = DAG.getNode(SPISD::Lo, DL, VT, L44); return DAG.getNode(ISD::ADD, DL, VT, H44, L44); } case CodeModel::Large: { // abs64. SDValue Hi = makeHiLoPair(Op, SPII::MO_HH, SPII::MO_HM, DAG); Hi = DAG.getNode(ISD::SHL, DL, VT, Hi, DAG.getConstant(32, MVT::i32)); SDValue Lo = makeHiLoPair(Op, SPII::MO_HI, SPII::MO_LO, DAG); return DAG.getNode(ISD::ADD, DL, VT, Hi, Lo); } } } SDValue SparcTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const { return makeAddress(Op, DAG); } SDValue SparcTargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const { return makeAddress(Op, DAG); } static SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); // Convert the fp value to integer in an FP register. assert(Op.getValueType() == MVT::i32); Op = DAG.getNode(SPISD::FTOI, dl, MVT::f32, Op.getOperand(0)); return DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op); } static SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); assert(Op.getOperand(0).getValueType() == MVT::i32); SDValue Tmp = DAG.getNode(ISD::BITCAST, dl, MVT::f32, Op.getOperand(0)); // Convert the int value to FP in an FP register. return DAG.getNode(SPISD::ITOF, dl, Op.getValueType(), Tmp); } static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) { SDValue Chain = Op.getOperand(0); ISD::CondCode CC = cast(Op.getOperand(1))->get(); SDValue LHS = Op.getOperand(2); SDValue RHS = Op.getOperand(3); SDValue Dest = Op.getOperand(4); DebugLoc dl = Op.getDebugLoc(); unsigned Opc, SPCC = ~0U; // If this is a br_cc of a "setcc", and if the setcc got lowered into // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. LookThroughSetCC(LHS, RHS, CC, SPCC); // Get the condition flag. SDValue CompareFlag; if (LHS.getValueType().isInteger()) { EVT VTs[] = { LHS.getValueType(), MVT::Glue }; SDValue Ops[2] = { LHS, RHS }; CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1); if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); // 32-bit compares use the icc flags, 64-bit uses the xcc flags. Opc = LHS.getValueType() == MVT::i32 ? SPISD::BRICC : SPISD::BRXCC; } else { CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Glue, LHS, RHS); if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); Opc = SPISD::BRFCC; } return DAG.getNode(Opc, dl, MVT::Other, Chain, Dest, DAG.getConstant(SPCC, MVT::i32), CompareFlag); } static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) { SDValue LHS = Op.getOperand(0); SDValue RHS = Op.getOperand(1); ISD::CondCode CC = cast(Op.getOperand(4))->get(); SDValue TrueVal = Op.getOperand(2); SDValue FalseVal = Op.getOperand(3); DebugLoc dl = Op.getDebugLoc(); unsigned Opc, SPCC = ~0U; // If this is a select_cc of a "setcc", and if the setcc got lowered into // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. LookThroughSetCC(LHS, RHS, CC, SPCC); SDValue CompareFlag; if (LHS.getValueType().isInteger()) { // subcc returns a value EVT VTs[] = { LHS.getValueType(), MVT::Glue }; SDValue Ops[2] = { LHS, RHS }; CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1); Opc = LHS.getValueType() == MVT::i32 ? SPISD::SELECT_ICC : SPISD::SELECT_XCC; if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); } else { CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Glue, LHS, RHS); Opc = SPISD::SELECT_FCC; if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); } return DAG.getNode(Opc, dl, TrueVal.getValueType(), TrueVal, FalseVal, DAG.getConstant(SPCC, MVT::i32), CompareFlag); } static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG, const SparcTargetLowering &TLI) { MachineFunction &MF = DAG.getMachineFunction(); SparcMachineFunctionInfo *FuncInfo = MF.getInfo(); // vastart just stores the address of the VarArgsFrameIndex slot into the // memory location argument. DebugLoc DL = Op.getDebugLoc(); SDValue Offset = DAG.getNode(ISD::ADD, DL, TLI.getPointerTy(), DAG.getRegister(SP::I6, TLI.getPointerTy()), DAG.getIntPtrConstant(FuncInfo->getVarArgsFrameOffset())); const Value *SV = cast(Op.getOperand(2))->getValue(); return DAG.getStore(Op.getOperand(0), DL, Offset, Op.getOperand(1), MachinePointerInfo(SV), false, false, 0); } static SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) { SDNode *Node = Op.getNode(); EVT VT = Node->getValueType(0); SDValue InChain = Node->getOperand(0); SDValue VAListPtr = Node->getOperand(1); EVT PtrVT = VAListPtr.getValueType(); const Value *SV = cast(Node->getOperand(2))->getValue(); DebugLoc DL = Node->getDebugLoc(); SDValue VAList = DAG.getLoad(PtrVT, DL, InChain, VAListPtr, MachinePointerInfo(SV), false, false, false, 0); // Increment the pointer, VAList, to the next vaarg. SDValue NextPtr = DAG.getNode(ISD::ADD, DL, PtrVT, VAList, DAG.getIntPtrConstant(VT.getSizeInBits()/8)); // Store the incremented VAList to the legalized pointer. InChain = DAG.getStore(VAList.getValue(1), DL, NextPtr, VAListPtr, MachinePointerInfo(SV), false, false, 0); // Load the actual argument out of the pointer VAList. // We can't count on greater alignment than the word size. return DAG.getLoad(VT, DL, InChain, VAList, MachinePointerInfo(), false, false, false, std::min(PtrVT.getSizeInBits(), VT.getSizeInBits())/8); } static SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) { SDValue Chain = Op.getOperand(0); // Legalize the chain. SDValue Size = Op.getOperand(1); // Legalize the size. DebugLoc dl = Op.getDebugLoc(); unsigned SPReg = SP::O6; SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32); SDValue NewSP = DAG.getNode(ISD::SUB, dl, MVT::i32, SP, Size); // Value Chain = DAG.getCopyToReg(SP.getValue(1), dl, SPReg, NewSP); // Output chain // The resultant pointer is actually 16 words from the bottom of the stack, // to provide a register spill area. SDValue NewVal = DAG.getNode(ISD::ADD, dl, MVT::i32, NewSP, DAG.getConstant(96, MVT::i32)); SDValue Ops[2] = { NewVal, Chain }; return DAG.getMergeValues(Ops, 2, dl); } static SDValue getFLUSHW(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); SDValue Chain = DAG.getNode(SPISD::FLUSHW, dl, MVT::Other, DAG.getEntryNode()); return Chain; } static SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) { MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); MFI->setFrameAddressIsTaken(true); EVT VT = Op.getValueType(); DebugLoc dl = Op.getDebugLoc(); unsigned FrameReg = SP::I6; uint64_t depth = Op.getConstantOperandVal(0); SDValue FrameAddr; if (depth == 0) FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT); else { // flush first to make sure the windowed registers' values are in stack SDValue Chain = getFLUSHW(Op, DAG); FrameAddr = DAG.getCopyFromReg(Chain, dl, FrameReg, VT); for (uint64_t i = 0; i != depth; ++i) { SDValue Ptr = DAG.getNode(ISD::ADD, dl, MVT::i32, FrameAddr, DAG.getIntPtrConstant(56)); FrameAddr = DAG.getLoad(MVT::i32, dl, Chain, Ptr, MachinePointerInfo(), false, false, false, 0); } } return FrameAddr; } static SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) { MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); MFI->setReturnAddressIsTaken(true); EVT VT = Op.getValueType(); DebugLoc dl = Op.getDebugLoc(); unsigned RetReg = SP::I7; uint64_t depth = Op.getConstantOperandVal(0); SDValue RetAddr; if (depth == 0) RetAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, RetReg, VT); else { // flush first to make sure the windowed registers' values are in stack SDValue Chain = getFLUSHW(Op, DAG); RetAddr = DAG.getCopyFromReg(Chain, dl, SP::I6, VT); for (uint64_t i = 0; i != depth; ++i) { SDValue Ptr = DAG.getNode(ISD::ADD, dl, MVT::i32, RetAddr, DAG.getIntPtrConstant((i == depth-1)?60:56)); RetAddr = DAG.getLoad(MVT::i32, dl, Chain, Ptr, MachinePointerInfo(), false, false, false, 0); } } return RetAddr; } SDValue SparcTargetLowering:: LowerOperation(SDValue Op, SelectionDAG &DAG) const { switch (Op.getOpcode()) { default: llvm_unreachable("Should not custom lower this!"); case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG); case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); case ISD::GlobalTLSAddress: llvm_unreachable("TLS not implemented for Sparc."); case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); case ISD::ConstantPool: return LowerConstantPool(Op, DAG); case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG); case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG); case ISD::BR_CC: return LowerBR_CC(Op, DAG); case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); case ISD::VASTART: return LowerVASTART(Op, DAG, *this); case ISD::VAARG: return LowerVAARG(Op, DAG); case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG); } } MachineBasicBlock * SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, MachineBasicBlock *BB) const { const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); unsigned BROpcode; unsigned CC; DebugLoc dl = MI->getDebugLoc(); // Figure out the conditional branch opcode to use for this select_cc. switch (MI->getOpcode()) { default: llvm_unreachable("Unknown SELECT_CC!"); case SP::SELECT_CC_Int_ICC: case SP::SELECT_CC_FP_ICC: case SP::SELECT_CC_DFP_ICC: BROpcode = SP::BCOND; break; case SP::SELECT_CC_Int_FCC: case SP::SELECT_CC_FP_FCC: case SP::SELECT_CC_DFP_FCC: BROpcode = SP::FBCOND; break; } CC = (SPCC::CondCodes)MI->getOperand(3).getImm(); // 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(); MachineFunction::iterator It = BB; ++It; // thisMBB: // ... // TrueVal = ... // [f]bCC copy1MBB // fallthrough --> copy0MBB MachineBasicBlock *thisMBB = BB; MachineFunction *F = BB->getParent(); MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); F->insert(It, copy0MBB); F->insert(It, sinkMBB); // Transfer the remainder of BB and its successor edges to sinkMBB. sinkMBB->splice(sinkMBB->begin(), BB, llvm::next(MachineBasicBlock::iterator(MI)), BB->end()); sinkMBB->transferSuccessorsAndUpdatePHIs(BB); // Add the true and fallthrough blocks as its successors. BB->addSuccessor(copy0MBB); BB->addSuccessor(sinkMBB); BuildMI(BB, dl, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC); // 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, BB->begin(), dl, TII.get(SP::PHI), MI->getOperand(0).getReg()) .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); MI->eraseFromParent(); // The pseudo instruction is gone now. return BB; } //===----------------------------------------------------------------------===// // Sparc Inline Assembly Support //===----------------------------------------------------------------------===// /// getConstraintType - Given a constraint letter, return the type of /// constraint it is for this target. SparcTargetLowering::ConstraintType SparcTargetLowering::getConstraintType(const std::string &Constraint) const { if (Constraint.size() == 1) { switch (Constraint[0]) { default: break; case 'r': return C_RegisterClass; } } return TargetLowering::getConstraintType(Constraint); } std::pair SparcTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const { if (Constraint.size() == 1) { switch (Constraint[0]) { case 'r': return std::make_pair(0U, &SP::IntRegsRegClass); } } return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); } bool SparcTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const { // The Sparc target isn't yet aware of offsets. return false; }