X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FSparc%2FSparcRegisterInfo.cpp;h=fe91a3d070291944fde3eabc1eb28cddfcf7f0fa;hb=6a2e7ac0b6647a409394e58b385e579ea62b5cba;hp=9ca7d456e5b6e140d7f455cf31d5eeaa4022e247;hpb=f6372aa1cc568df19da7c5023e83c75aa9404a07;p=oota-llvm.git diff --git a/lib/Target/Sparc/SparcRegisterInfo.cpp b/lib/Target/Sparc/SparcRegisterInfo.cpp index 9ca7d456e5b..fe91a3d0702 100644 --- a/lib/Target/Sparc/SparcRegisterInfo.cpp +++ b/lib/Target/Sparc/SparcRegisterInfo.cpp @@ -1,4 +1,4 @@ -//===- SparcRegisterInfo.cpp - SPARC Register Information -------*- C++ -*-===// +//===-- SparcRegisterInfo.cpp - SPARC Register Information ----------------===// // // The LLVM Compiler Infrastructure // @@ -7,231 +7,126 @@ // //===----------------------------------------------------------------------===// // -// This file contains the SPARC implementation of the MRegisterInfo class. +// This file contains the SPARC implementation of the TargetRegisterInfo class. // //===----------------------------------------------------------------------===// -#include "Sparc.h" #include "SparcRegisterInfo.h" +#include "Sparc.h" +#include "SparcMachineFunctionInfo.h" #include "SparcSubtarget.h" -#include "llvm/CodeGen/MachineInstrBuilder.h" -#include "llvm/CodeGen/MachineFunction.h" -#include "llvm/CodeGen/MachineFrameInfo.h" -#include "llvm/CodeGen/MachineLocation.h" -#include "llvm/Target/TargetInstrInfo.h" -#include "llvm/Type.h" #include "llvm/ADT/BitVector.h" #include "llvm/ADT/STLExtras.h" -using namespace llvm; +#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/IR/Type.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Target/TargetInstrInfo.h" -SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st, - const TargetInstrInfo &tii) - : SparcGenRegisterInfo(SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP), - Subtarget(st), TII(tii) { -} +#define GET_REGINFO_TARGET_DESC +#include "SparcGenRegisterInfo.inc" -void SparcRegisterInfo::reMaterialize(MachineBasicBlock &MBB, - MachineBasicBlock::iterator I, - unsigned DestReg, - const MachineInstr *Orig) const { - MachineInstr *MI = Orig->clone(); - MI->getOperand(0).setReg(DestReg); - MBB.insert(I, MI); -} +using namespace llvm; -MachineInstr *SparcRegisterInfo::foldMemoryOperand(MachineInstr* MI, - SmallVectorImpl &Ops, - int FI) const { - if (Ops.size() != 1) return NULL; - - unsigned OpNum = Ops[0]; - bool isFloat = false; - MachineInstr *NewMI = NULL; - switch (MI->getOpcode()) { - case SP::ORrr: - if (MI->getOperand(1).isRegister() && MI->getOperand(1).getReg() == SP::G0&& - MI->getOperand(0).isRegister() && MI->getOperand(2).isRegister()) { - if (OpNum == 0) // COPY -> STORE - NewMI = BuildMI(TII.get(SP::STri)).addFrameIndex(FI).addImm(0) - .addReg(MI->getOperand(2).getReg()); - else // COPY -> LOAD - NewMI = BuildMI(TII.get(SP::LDri), MI->getOperand(0).getReg()) - .addFrameIndex(FI).addImm(0); - } - break; - case SP::FMOVS: - isFloat = true; - // FALLTHROUGH - case SP::FMOVD: - if (OpNum == 0) // COPY -> STORE - NewMI = BuildMI(TII.get(isFloat ? SP::STFri : SP::STDFri)) - .addFrameIndex(FI).addImm(0).addReg(MI->getOperand(1).getReg()); - else // COPY -> LOAD - NewMI = BuildMI(TII.get(isFloat ? SP::LDFri : SP::LDDFri), - MI->getOperand(0).getReg()).addFrameIndex(FI).addImm(0); - break; - } +static cl::opt +ReserveAppRegisters("sparc-reserve-app-registers", cl::Hidden, cl::init(false), + cl::desc("Reserve application registers (%g2-%g4)")); - if (NewMI) - NewMI->copyKillDeadInfo(MI); - return NewMI; +SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st, + const TargetInstrInfo &tii) + : SparcGenRegisterInfo(SP::I7), Subtarget(st), TII(tii) { } -const unsigned* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) +const uint16_t* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const { - static const unsigned CalleeSavedRegs[] = { 0 }; + static const uint16_t CalleeSavedRegs[] = { 0 }; return CalleeSavedRegs; } BitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const { BitVector Reserved(getNumRegs()); - Reserved.set(SP::G2); - Reserved.set(SP::G3); - Reserved.set(SP::G4); + // FIXME: G1 reserved for now for large imm generation by frame code. + Reserved.set(SP::G1); + + // G1-G4 can be used in applications. + if (ReserveAppRegisters) { + Reserved.set(SP::G2); + Reserved.set(SP::G3); + Reserved.set(SP::G4); + } + // G5 is not reserved in 64 bit mode. + if (!Subtarget.is64Bit()) + Reserved.set(SP::G5); + Reserved.set(SP::O6); Reserved.set(SP::I6); Reserved.set(SP::I7); Reserved.set(SP::G0); - Reserved.set(SP::G5); Reserved.set(SP::G6); Reserved.set(SP::G7); return Reserved; } - -const TargetRegisterClass* const* -SparcRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const { - static const TargetRegisterClass * const CalleeSavedRegClasses[] = { 0 }; - return CalleeSavedRegClasses; -} - -bool SparcRegisterInfo::hasFP(const MachineFunction &MF) const { - return false; +const TargetRegisterClass* +SparcRegisterInfo::getPointerRegClass(const MachineFunction &MF, + unsigned Kind) const { + return Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass; } -void SparcRegisterInfo:: -eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, - MachineBasicBlock::iterator I) const { - MachineInstr &MI = *I; - int Size = MI.getOperand(0).getImm(); - if (MI.getOpcode() == SP::ADJCALLSTACKDOWN) - Size = -Size; - if (Size) - BuildMI(MBB, I, TII.get(SP::ADDri), SP::O6).addReg(SP::O6).addImm(Size); - MBB.erase(I); -} - -void SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, - int SPAdj, RegScavenger *RS) const { +void +SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, + int SPAdj, unsigned FIOperandNum, + RegScavenger *RS) const { assert(SPAdj == 0 && "Unexpected"); - unsigned i = 0; MachineInstr &MI = *II; - while (!MI.getOperand(i).isFrameIndex()) { - ++i; - assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); - } - - int FrameIndex = MI.getOperand(i).getIndex(); + DebugLoc dl = MI.getDebugLoc(); + int FrameIndex = MI.getOperand(FIOperandNum).getIndex(); // Addressable stack objects are accessed using neg. offsets from %fp MachineFunction &MF = *MI.getParent()->getParent(); - int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + - MI.getOperand(i+1).getImm(); + int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + + MI.getOperand(FIOperandNum + 1).getImm() + + Subtarget.getStackPointerBias(); + SparcMachineFunctionInfo *FuncInfo = MF.getInfo(); + unsigned FramePtr = SP::I6; + if (FuncInfo->isLeafProc()) { + // Use %sp and adjust offset if needed. + FramePtr = SP::O6; + int stackSize = MF.getFrameInfo()->getStackSize(); + Offset += (stackSize) ? Subtarget.getAdjustedFrameSize(stackSize) : 0 ; + } // Replace frame index with a frame pointer reference. if (Offset >= -4096 && Offset <= 4095) { // If the offset is small enough to fit in the immediate field, directly // encode it. - MI.getOperand(i).ChangeToRegister(SP::I6, false); - MI.getOperand(i+1).ChangeToImmediate(Offset); + MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false); + MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset); } else { - // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to + // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to // scavenge a register here instead of reserving G1 all of the time. unsigned OffHi = (unsigned)Offset >> 10U; - BuildMI(*MI.getParent(), II, TII.get(SP::SETHIi), SP::G1).addImm(OffHi); + BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi); // Emit G1 = G1 + I6 - BuildMI(*MI.getParent(), II, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1) - .addReg(SP::I6); + BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1) + .addReg(FramePtr); // Insert: G1+%lo(offset) into the user. - MI.getOperand(i).ChangeToRegister(SP::G1, false); - MI.getOperand(i+1).ChangeToImmediate(Offset & ((1 << 10)-1)); - } -} - -void SparcRegisterInfo:: -processFunctionBeforeFrameFinalized(MachineFunction &MF) const {} - -void SparcRegisterInfo::emitPrologue(MachineFunction &MF) const { - MachineBasicBlock &MBB = MF.front(); - MachineFrameInfo *MFI = MF.getFrameInfo(); - - // Get the number of bytes to allocate from the FrameInfo - int NumBytes = (int) MFI->getStackSize(); - - // Emit the correct save instruction based on the number of bytes in - // the frame. Minimum stack frame size according to V8 ABI is: - // 16 words for register window spill - // 1 word for address of returned aggregate-value - // + 6 words for passing parameters on the stack - // ---------- - // 23 words * 4 bytes per word = 92 bytes - NumBytes += 92; - // Round up to next doubleword boundary -- a double-word boundary - // is required by the ABI. - NumBytes = (NumBytes + 7) & ~7; - NumBytes = -NumBytes; - - if (NumBytes >= -4096) { - BuildMI(MBB, MBB.begin(), TII.get(SP::SAVEri), - SP::O6).addImm(NumBytes).addReg(SP::O6); - } else { - MachineBasicBlock::iterator InsertPt = MBB.begin(); - // Emit this the hard way. This clobbers G1 which we always know is - // available here. - unsigned OffHi = (unsigned)NumBytes >> 10U; - BuildMI(MBB, InsertPt, TII.get(SP::SETHIi), SP::G1).addImm(OffHi); - // Emit G1 = G1 + I6 - BuildMI(MBB, InsertPt, TII.get(SP::ORri), SP::G1) - .addReg(SP::G1).addImm(NumBytes & ((1 << 10)-1)); - BuildMI(MBB, InsertPt, TII.get(SP::SAVErr), SP::O6) - .addReg(SP::O6).addReg(SP::G1); + MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false); + MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset & ((1 << 10)-1)); } } -void SparcRegisterInfo::emitEpilogue(MachineFunction &MF, - MachineBasicBlock &MBB) const { - MachineBasicBlock::iterator MBBI = prior(MBB.end()); - assert(MBBI->getOpcode() == SP::RETL && - "Can only put epilog before 'retl' instruction!"); - BuildMI(MBB, MBBI, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0) - .addReg(SP::G0); -} - -unsigned SparcRegisterInfo::getRARegister() const { - assert(0 && "What is the return address register"); - return 0; -} - -unsigned SparcRegisterInfo::getFrameRegister(MachineFunction &MF) const { - assert(0 && "What is the frame register"); - return SP::G1; +unsigned SparcRegisterInfo::getFrameRegister(const MachineFunction &MF) const { + return SP::I6; } unsigned SparcRegisterInfo::getEHExceptionRegister() const { - assert(0 && "What is the exception register"); - return 0; + llvm_unreachable("What is the exception register"); } unsigned SparcRegisterInfo::getEHHandlerRegister() const { - assert(0 && "What is the exception handler register"); - return 0; + llvm_unreachable("What is the exception handler register"); } - -int SparcRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const { - assert(0 && "What is the dwarf register number"); - return -1; -} - -#include "SparcGenRegisterInfo.inc" -