X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FMips%2FMipsRegisterInfo.cpp;h=f30de449f6d57c24be1e2b45d56652e8c8e9c7e8;hb=c12a6e6b53bb6df62a0020bda91206fd149c430a;hp=5e719af871d28d6045332ddf0d64318d1e1feb48;hpb=b92187a4103dca24c3767c380f63593d1f6161a7;p=oota-llvm.git diff --git a/lib/Target/Mips/MipsRegisterInfo.cpp b/lib/Target/Mips/MipsRegisterInfo.cpp index 5e719af871d..f30de449f6d 100644 --- a/lib/Target/Mips/MipsRegisterInfo.cpp +++ b/lib/Target/Mips/MipsRegisterInfo.cpp @@ -1,4 +1,4 @@ -//===- MipsRegisterInfo.cpp - MIPS Register Information -== -----*- C++ -*-===// +//===-- MipsRegisterInfo.cpp - MIPS Register Information -== --------------===// // // The LLVM Compiler Infrastructure // @@ -13,9 +13,10 @@ #define DEBUG_TYPE "mips-reg-info" +#include "MipsRegisterInfo.h" #include "Mips.h" +#include "MipsAnalyzeImmediate.h" #include "MipsSubtarget.h" -#include "MipsRegisterInfo.h" #include "MipsMachineFunction.h" #include "llvm/Constants.h" #include "llvm/Type.h" @@ -24,8 +25,7 @@ #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineFrameInfo.h" -#include "llvm/CodeGen/MachineLocation.h" -#include "llvm/Target/TargetFrameInfo.h" +#include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetInstrInfo.h" @@ -35,313 +35,109 @@ #include "llvm/Support/raw_ostream.h" #include "llvm/ADT/BitVector.h" #include "llvm/ADT/STLExtras.h" +#include "llvm/Analysis/DebugInfo.h" + +#define GET_REGINFO_TARGET_DESC +#include "MipsGenRegisterInfo.inc" using namespace llvm; -MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST, +MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST, const TargetInstrInfo &tii) - : MipsGenRegisterInfo(Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP), - Subtarget(ST), TII(tii) {} - -/// getRegisterNumbering - Given the enum value for some register, e.g. -/// Mips::RA, return the number that it corresponds to (e.g. 31). -unsigned MipsRegisterInfo:: -getRegisterNumbering(unsigned RegEnum) -{ - switch (RegEnum) { - case Mips::ZERO : case Mips::F0 : case Mips::D0 : return 0; - case Mips::AT : case Mips::F1 : return 1; - case Mips::V0 : case Mips::F2 : case Mips::D1 : return 2; - case Mips::V1 : case Mips::F3 : return 3; - case Mips::A0 : case Mips::F4 : case Mips::D2 : return 4; - case Mips::A1 : case Mips::F5 : return 5; - case Mips::A2 : case Mips::F6 : case Mips::D3 : return 6; - case Mips::A3 : case Mips::F7 : return 7; - case Mips::T0 : case Mips::F8 : case Mips::D4 : return 8; - case Mips::T1 : case Mips::F9 : return 9; - case Mips::T2 : case Mips::F10: case Mips::D5: return 10; - case Mips::T3 : case Mips::F11: return 11; - case Mips::T4 : case Mips::F12: case Mips::D6: return 12; - case Mips::T5 : case Mips::F13: return 13; - case Mips::T6 : case Mips::F14: case Mips::D7: return 14; - case Mips::T7 : case Mips::F15: return 15; - case Mips::T8 : case Mips::F16: case Mips::D8: return 16; - case Mips::T9 : case Mips::F17: return 17; - case Mips::S0 : case Mips::F18: case Mips::D9: return 18; - case Mips::S1 : case Mips::F19: return 19; - case Mips::S2 : case Mips::F20: case Mips::D10: return 20; - case Mips::S3 : case Mips::F21: return 21; - case Mips::S4 : case Mips::F22: case Mips::D11: return 22; - case Mips::S5 : case Mips::F23: return 23; - case Mips::S6 : case Mips::F24: case Mips::D12: return 24; - case Mips::S7 : case Mips::F25: return 25; - case Mips::K0 : case Mips::F26: case Mips::D13: return 26; - case Mips::K1 : case Mips::F27: return 27; - case Mips::GP : case Mips::F28: case Mips::D14: return 28; - case Mips::SP : case Mips::F29: return 29; - case Mips::FP : case Mips::F30: case Mips::D15: return 30; - case Mips::RA : case Mips::F31: return 31; - default: llvm_unreachable("Unknown register number!"); - } - return 0; // Not reached -} + : MipsGenRegisterInfo(Mips::RA), Subtarget(ST), TII(tii) {} unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; } //===----------------------------------------------------------------------===// -// Callee Saved Registers methods +// Callee Saved Registers methods //===----------------------------------------------------------------------===// /// Mips Callee Saved Registers -const unsigned* MipsRegisterInfo:: -getCalleeSavedRegs(const MachineFunction *MF) const +const uint16_t* MipsRegisterInfo:: +getCalleeSavedRegs(const MachineFunction *MF) const { - // Mips callee-save register range is $16-$23, $f20-$f30 - static const unsigned SingleFloatOnlyCalleeSavedRegs[] = { - Mips::S0, Mips::S1, Mips::S2, Mips::S3, - Mips::S4, Mips::S5, Mips::S6, Mips::S7, - Mips::F20, Mips::F21, Mips::F22, Mips::F23, Mips::F24, Mips::F25, - Mips::F26, Mips::F27, Mips::F28, Mips::F29, Mips::F30, 0 - }; - - static const unsigned BitMode32CalleeSavedRegs[] = { - Mips::S0, Mips::S1, Mips::S2, Mips::S3, - Mips::S4, Mips::S5, Mips::S6, Mips::S7, - Mips::F20, Mips::F22, Mips::F24, Mips::F26, Mips::F28, Mips::F30, 0 - }; + if (Subtarget.isSingleFloat()) + return CSR_SingleFloatOnly_SaveList; + else if (!Subtarget.hasMips64()) + return CSR_O32_SaveList; + else if (Subtarget.isABI_N32()) + return CSR_N32_SaveList; + + assert(Subtarget.isABI_N64()); + return CSR_N64_SaveList; +} +const uint32_t* +MipsRegisterInfo::getCallPreservedMask(CallingConv::ID) const +{ if (Subtarget.isSingleFloat()) - return SingleFloatOnlyCalleeSavedRegs; - else - return BitMode32CalleeSavedRegs; + return CSR_SingleFloatOnly_RegMask; + else if (!Subtarget.hasMips64()) + return CSR_O32_RegMask; + else if (Subtarget.isABI_N32()) + return CSR_N32_RegMask; + + assert(Subtarget.isABI_N64()); + return CSR_N64_RegMask; } -/// Mips Callee Saved Register Classes -const TargetRegisterClass* const* -MipsRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const -{ - static const TargetRegisterClass * const SingleFloatOnlyCalleeSavedRC[] = { - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, &Mips::FGR32RegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, &Mips::FGR32RegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, &Mips::FGR32RegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, 0 +BitVector MipsRegisterInfo:: +getReservedRegs(const MachineFunction &MF) const { + static const uint16_t ReservedCPURegs[] = { + Mips::ZERO, Mips::AT, Mips::K0, Mips::K1, + Mips::SP, Mips::FP, Mips::RA }; - static const TargetRegisterClass * const BitMode32CalleeSavedRC[] = { - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, &Mips::FGR32RegClass, - &Mips::FGR32RegClass, &Mips::FGR32RegClass, &Mips::FGR32RegClass, 0 + static const uint16_t ReservedCPU64Regs[] = { + Mips::ZERO_64, Mips::AT_64, Mips::K0_64, Mips::K1_64, + Mips::SP_64, Mips::FP_64, Mips::RA_64 }; - if (Subtarget.isSingleFloat()) - return SingleFloatOnlyCalleeSavedRC; - else - return BitMode32CalleeSavedRC; -} - -BitVector MipsRegisterInfo:: -getReservedRegs(const MachineFunction &MF) const -{ BitVector Reserved(getNumRegs()); - Reserved.set(Mips::ZERO); - Reserved.set(Mips::AT); - Reserved.set(Mips::K0); - Reserved.set(Mips::K1); - Reserved.set(Mips::GP); - Reserved.set(Mips::SP); - Reserved.set(Mips::FP); - Reserved.set(Mips::RA); - - // SRV4 requires that odd register can't be used. - if (!Subtarget.isSingleFloat()) - for (unsigned FReg=(Mips::F0)+1; FReg < Mips::F30; FReg+=2) - Reserved.set(FReg); - - return Reserved; -} + typedef TargetRegisterClass::iterator RegIter; -//===----------------------------------------------------------------------===// -// -// Stack Frame Processing methods -// +----------------------------+ -// -// The stack is allocated decrementing the stack pointer on -// the first instruction of a function prologue. Once decremented, -// all stack references are done thought a positive offset -// from the stack/frame pointer, so the stack is considering -// to grow up! Otherwise terrible hacks would have to be made -// to get this stack ABI compliant :) -// -// The stack frame required by the ABI (after call): -// Offset -// -// 0 ---------- -// 4 Args to pass -// . saved $GP (used in PIC) -// . Alloca allocations -// . Local Area -// . CPU "Callee Saved" Registers -// . saved FP -// . saved RA -// . FPU "Callee Saved" Registers -// StackSize ----------- -// -// Offset - offset from sp after stack allocation on function prologue -// -// The sp is the stack pointer subtracted/added from the stack size -// at the Prologue/Epilogue -// -// References to the previous stack (to obtain arguments) are done -// with offsets that exceeds the stack size: (stacksize+(4*(num_arg-1)) -// -// Examples: -// - reference to the actual stack frame -// for any local area var there is smt like : FI >= 0, StackOffset: 4 -// sw REGX, 4(SP) -// -// - reference to previous stack frame -// suppose there's a load to the 5th arguments : FI < 0, StackOffset: 16. -// The emitted instruction will be something like: -// lw REGX, 16+StackSize(SP) -// -// Since the total stack size is unknown on LowerFormalArguments, all -// stack references (ObjectOffset) created to reference the function -// arguments, are negative numbers. This way, on eliminateFrameIndex it's -// possible to detect those references and the offsets are adjusted to -// their real location. -// -//===----------------------------------------------------------------------===// + for (unsigned I = 0; I < array_lengthof(ReservedCPURegs); ++I) + Reserved.set(ReservedCPURegs[I]); -void MipsRegisterInfo::adjustMipsStackFrame(MachineFunction &MF) const -{ - MachineFrameInfo *MFI = MF.getFrameInfo(); - MipsFunctionInfo *MipsFI = MF.getInfo(); - const std::vector &CSI = MFI->getCalleeSavedInfo(); - unsigned StackAlign = MF.getTarget().getFrameInfo()->getStackAlignment(); - unsigned RegSize = Subtarget.isGP32bit() ? 4 : 8; - bool HasGP = MipsFI->needGPSaveRestore(); - - // Min and Max CSI FrameIndex. - int MinCSFI = -1, MaxCSFI = -1; - - // See the description at MipsMachineFunction.h - int TopCPUSavedRegOff = -1, TopFPUSavedRegOff = -1; - - // Replace the dummy '0' SPOffset by the negative offsets, as explained on - // LowerFormalArguments. Leaving '0' for while is necessary to avoid - // the approach done by calculateFrameObjectOffsets to the stack frame. - MipsFI->adjustLoadArgsFI(MFI); - MipsFI->adjustStoreVarArgsFI(MFI); - - // It happens that the default stack frame allocation order does not directly - // map to the convention used for mips. So we must fix it. We move the callee - // save register slots after the local variables area, as described in the - // stack frame above. - unsigned CalleeSavedAreaSize = 0; - if (!CSI.empty()) { - MinCSFI = CSI[0].getFrameIdx(); - MaxCSFI = CSI[CSI.size()-1].getFrameIdx(); - } - for (unsigned i = 0, e = CSI.size(); i != e; ++i) - CalleeSavedAreaSize += MFI->getObjectAlignment(CSI[i].getFrameIdx()); - - unsigned StackOffset = HasGP ? (MipsFI->getGPStackOffset()+RegSize) - : (Subtarget.isABI_O32() ? 16 : 0); - - // Adjust local variables. They should come on the stack right - // after the arguments. - int LastOffsetFI = -1; - for (int i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) { - if (i >= MinCSFI && i <= MaxCSFI) - continue; - if (MFI->isDeadObjectIndex(i)) - continue; - unsigned Offset = - StackOffset + MFI->getObjectOffset(i) - CalleeSavedAreaSize; - if (LastOffsetFI == -1) - LastOffsetFI = i; - if (Offset > MFI->getObjectOffset(LastOffsetFI)) - LastOffsetFI = i; - MFI->setObjectOffset(i, Offset); - } + if (Subtarget.hasMips64()) { + for (unsigned I = 0; I < array_lengthof(ReservedCPU64Regs); ++I) + Reserved.set(ReservedCPU64Regs[I]); - // Adjust CPU Callee Saved Registers Area. Registers RA and FP must - // be saved in this CPU Area. This whole area must be aligned to the - // default Stack Alignment requirements. - if (LastOffsetFI >= 0) - StackOffset = MFI->getObjectOffset(LastOffsetFI)+ - MFI->getObjectSize(LastOffsetFI); - StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign); - - for (unsigned i = 0, e = CSI.size(); i != e ; ++i) { - if (CSI[i].getRegClass() != Mips::CPURegsRegisterClass) - break; - MFI->setObjectOffset(CSI[i].getFrameIdx(), StackOffset); - TopCPUSavedRegOff = StackOffset; - StackOffset += MFI->getObjectAlignment(CSI[i].getFrameIdx()); + // Reserve all registers in AFGR64. + for (RegIter Reg = Mips::AFGR64RegisterClass->begin(); + Reg != Mips::AFGR64RegisterClass->end(); ++Reg) + Reserved.set(*Reg); } - - // Stack locations for FP and RA. If only one of them is used, - // the space must be allocated for both, otherwise no space at all. - if (hasFP(MF) || MFI->adjustsStack()) { - // FP stack location - MFI->setObjectOffset(MFI->CreateStackObject(RegSize, RegSize, true), - StackOffset); - MipsFI->setFPStackOffset(StackOffset); - TopCPUSavedRegOff = StackOffset; - StackOffset += RegSize; - - // SP stack location - MFI->setObjectOffset(MFI->CreateStackObject(RegSize, RegSize, true), - StackOffset); - MipsFI->setRAStackOffset(StackOffset); - StackOffset += RegSize; - - if (MFI->adjustsStack()) - TopCPUSavedRegOff += RegSize; + else { + // Reserve all registers in CPU64Regs & FGR64. + for (RegIter Reg = Mips::CPU64RegsRegisterClass->begin(); + Reg != Mips::CPU64RegsRegisterClass->end(); ++Reg) + Reserved.set(*Reg); + + for (RegIter Reg = Mips::FGR64RegisterClass->begin(); + Reg != Mips::FGR64RegisterClass->end(); ++Reg) + Reserved.set(*Reg); } - StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign); - - // Adjust FPU Callee Saved Registers Area. This Area must be - // aligned to the default Stack Alignment requirements. - for (unsigned i = 0, e = CSI.size(); i != e; ++i) { - if (CSI[i].getRegClass() == Mips::CPURegsRegisterClass) - continue; - MFI->setObjectOffset(CSI[i].getFrameIdx(), StackOffset); - TopFPUSavedRegOff = StackOffset; - StackOffset += MFI->getObjectAlignment(CSI[i].getFrameIdx()); + // If GP is dedicated as a global base register, reserve it. + if (MF.getInfo()->globalBaseRegFixed()) { + Reserved.set(Mips::GP); + Reserved.set(Mips::GP_64); } - StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign); - - // Update frame info - MFI->setStackSize(StackOffset); - // Recalculate the final tops offset. The final values must be '0' - // if there isn't a callee saved register for CPU or FPU, otherwise - // a negative offset is needed. - if (TopCPUSavedRegOff >= 0) - MipsFI->setCPUTopSavedRegOff(TopCPUSavedRegOff-StackOffset); + // Reserve hardware registers. + Reserved.set(Mips::HWR29); + Reserved.set(Mips::HWR29_64); - if (TopFPUSavedRegOff >= 0) - MipsFI->setFPUTopSavedRegOff(TopFPUSavedRegOff-StackOffset); + return Reserved; } -// hasFP - Return true if the specified function should have a dedicated frame -// pointer register. This is true if the function has variable sized allocas or -// if frame pointer elimination is disabled. -bool MipsRegisterInfo:: -hasFP(const MachineFunction &MF) const { - const MachineFrameInfo *MFI = MF.getFrameInfo(); - return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects(); +bool +MipsRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const { + return true; } -// This function eliminate ADJCALLSTACKDOWN, +// This function eliminate ADJCALLSTACKDOWN, // ADJCALLSTACKUP pseudo instructions void MipsRegisterInfo:: eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, @@ -353,17 +149,18 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, // FrameIndex represent objects inside a abstract stack. // We must replace FrameIndex with an stack/frame pointer // direct reference. -unsigned MipsRegisterInfo:: +void MipsRegisterInfo:: eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, - FrameIndexValue *Value, RegScavenger *RS) const -{ + RegScavenger *RS) const { MachineInstr &MI = *II; MachineFunction &MF = *MI.getParent()->getParent(); + MachineFrameInfo *MFI = MF.getFrameInfo(); + MipsFunctionInfo *MipsFI = MF.getInfo(); unsigned i = 0; while (!MI.getOperand(i).isFI()) { ++i; - assert(i < MI.getNumOperands() && + assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); } @@ -371,161 +168,112 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, errs() << "<--------->\n" << MI); int FrameIndex = MI.getOperand(i).getIndex(); - int stackSize = MF.getFrameInfo()->getStackSize(); - int spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex); + uint64_t stackSize = MF.getFrameInfo()->getStackSize(); + int64_t spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex); DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n" << "spOffset : " << spOffset << "\n" << "stackSize : " << stackSize << "\n"); - // as explained on LowerFormalArguments, detect negative offsets - // and adjust SPOffsets considering the final stack size. - int Offset = ((spOffset < 0) ? (stackSize + (-(spOffset+4))) : (spOffset)); - Offset += MI.getOperand(i-1).getImm(); - - DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n"); - - MI.getOperand(i-1).ChangeToImmediate(Offset); - MI.getOperand(i).ChangeToRegister(getFrameRegister(MF), false); - return 0; -} - -void MipsRegisterInfo:: -emitPrologue(MachineFunction &MF) const -{ - MachineBasicBlock &MBB = MF.front(); - MachineFrameInfo *MFI = MF.getFrameInfo(); - MipsFunctionInfo *MipsFI = MF.getInfo(); - MachineBasicBlock::iterator MBBI = MBB.begin(); - DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc(); - bool isPIC = (MF.getTarget().getRelocationModel() == Reloc::PIC_); - - // Get the right frame order for Mips. - adjustMipsStackFrame(MF); - - // Get the number of bytes to allocate from the FrameInfo. - unsigned StackSize = MFI->getStackSize(); - - // No need to allocate space on the stack. - if (StackSize == 0 && !MFI->adjustsStack()) return; - - int FPOffset = MipsFI->getFPStackOffset(); - int RAOffset = MipsFI->getRAStackOffset(); - - BuildMI(MBB, MBBI, dl, TII.get(Mips::NOREORDER)); - - // TODO: check need from GP here. - if (isPIC && Subtarget.isABI_O32()) - BuildMI(MBB, MBBI, dl, TII.get(Mips::CPLOAD)).addReg(getPICCallReg()); - BuildMI(MBB, MBBI, dl, TII.get(Mips::NOMACRO)); - - // Adjust stack : addi sp, sp, (-imm) - BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP) - .addReg(Mips::SP).addImm(-StackSize); - - // Save the return address only if the function isnt a leaf one. - // sw $ra, stack_loc($sp) - if (MFI->adjustsStack()) { - BuildMI(MBB, MBBI, dl, TII.get(Mips::SW)) - .addReg(Mips::RA).addImm(RAOffset).addReg(Mips::SP); - } - - // if framepointer enabled, save it and set it - // to point to the stack pointer - if (hasFP(MF)) { - // sw $fp,stack_loc($sp) - BuildMI(MBB, MBBI, dl, TII.get(Mips::SW)) - .addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP); + const std::vector &CSI = MFI->getCalleeSavedInfo(); + int MinCSFI = 0; + int MaxCSFI = -1; - // move $fp, $sp - BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::FP) - .addReg(Mips::SP).addReg(Mips::ZERO); + if (CSI.size()) { + MinCSFI = CSI[0].getFrameIdx(); + MaxCSFI = CSI[CSI.size() - 1].getFrameIdx(); } - // Restore GP from the saved stack location - if (MipsFI->needGPSaveRestore()) - BuildMI(MBB, MBBI, dl, TII.get(Mips::CPRESTORE)) - .addImm(MipsFI->getGPStackOffset()); -} + // The following stack frame objects are always referenced relative to $sp: + // 1. Outgoing arguments. + // 2. Pointer to dynamically allocated stack space. + // 3. Locations for callee-saved registers. + // Everything else is referenced relative to whatever register + // getFrameRegister() returns. + unsigned FrameReg; + + if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isDynAllocFI(FrameIndex) || + (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI)) + FrameReg = Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP; + else + FrameReg = getFrameRegister(MF); + + // Calculate final offset. + // - There is no need to change the offset if the frame object is one of the + // following: an outgoing argument, pointer to a dynamically allocated + // stack space or a $gp restore location, + // - If the frame object is any of the following, its offset must be adjusted + // by adding the size of the stack: + // incoming argument, callee-saved register location or local variable. + int64_t Offset; + + if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) || + MipsFI->isDynAllocFI(FrameIndex)) + Offset = spOffset; + else + Offset = spOffset + (int64_t)stackSize; -void MipsRegisterInfo:: -emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const -{ - MachineBasicBlock::iterator MBBI = prior(MBB.end()); - MachineFrameInfo *MFI = MF.getFrameInfo(); - MipsFunctionInfo *MipsFI = MF.getInfo(); - DebugLoc dl = MBBI->getDebugLoc(); - - // Get the number of bytes from FrameInfo - int NumBytes = (int) MFI->getStackSize(); - - // Get the FI's where RA and FP are saved. - int FPOffset = MipsFI->getFPStackOffset(); - int RAOffset = MipsFI->getRAStackOffset(); - - // if framepointer enabled, restore it and restore the - // stack pointer - if (hasFP(MF)) { - // move $sp, $fp - BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::SP) - .addReg(Mips::FP).addReg(Mips::ZERO); - - // lw $fp,stack_loc($sp) - BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::FP) - .addImm(FPOffset).addReg(Mips::SP); - } + Offset += MI.getOperand(i+1).getImm(); - // Restore the return address only if the function isnt a leaf one. - // lw $ra, stack_loc($sp) - if (MFI->adjustsStack()) { - BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::RA) - .addImm(RAOffset).addReg(Mips::SP); - } + DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n"); - // adjust stack : insert addi sp, sp, (imm) - if (NumBytes) { - BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP) - .addReg(Mips::SP).addImm(NumBytes); + // If MI is not a debug value, make sure Offset fits in the 16-bit immediate + // field. + if (!MI.isDebugValue() && !isInt<16>(Offset)) { + MachineBasicBlock &MBB = *MI.getParent(); + DebugLoc DL = II->getDebugLoc(); + MipsAnalyzeImmediate AnalyzeImm; + unsigned Size = Subtarget.isABI_N64() ? 64 : 32; + unsigned LUi = Subtarget.isABI_N64() ? Mips::LUi64 : Mips::LUi; + unsigned ADDu = Subtarget.isABI_N64() ? Mips::DADDu : Mips::ADDu; + unsigned ZEROReg = Subtarget.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO; + unsigned ATReg = Subtarget.isABI_N64() ? Mips::AT_64 : Mips::AT; + const MipsAnalyzeImmediate::InstSeq &Seq = + AnalyzeImm.Analyze(Offset, Size, true /* LastInstrIsADDiu */); + MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin(); + + MipsFI->setEmitNOAT(); + + // The first instruction can be a LUi, which is different from other + // instructions (ADDiu, ORI and SLL) in that it does not have a register + // operand. + if (Inst->Opc == LUi) + BuildMI(MBB, II, DL, TII.get(LUi), ATReg) + .addImm(SignExtend64<16>(Inst->ImmOpnd)); + else + BuildMI(MBB, II, DL, TII.get(Inst->Opc), ATReg).addReg(ZEROReg) + .addImm(SignExtend64<16>(Inst->ImmOpnd)); + + // Build the remaining instructions in Seq except for the last one. + for (++Inst; Inst != Seq.end() - 1; ++Inst) + BuildMI(MBB, II, DL, TII.get(Inst->Opc), ATReg).addReg(ATReg) + .addImm(SignExtend64<16>(Inst->ImmOpnd)); + + BuildMI(MBB, II, DL, TII.get(ADDu), ATReg).addReg(FrameReg).addReg(ATReg); + + FrameReg = ATReg; + Offset = SignExtend64<16>(Inst->ImmOpnd); } -} - -void MipsRegisterInfo:: -processFunctionBeforeFrameFinalized(MachineFunction &MF) const { - // Set the stack offset where GP must be saved/loaded from. - MachineFrameInfo *MFI = MF.getFrameInfo(); - MipsFunctionInfo *MipsFI = MF.getInfo(); - if (MipsFI->needGPSaveRestore()) - MFI->setObjectOffset(MipsFI->getGPFI(), MipsFI->getGPStackOffset()); -} - -unsigned MipsRegisterInfo:: -getRARegister() const { - return Mips::RA; + MI.getOperand(i).ChangeToRegister(FrameReg, false); + MI.getOperand(i+1).ChangeToImmediate(Offset); } unsigned MipsRegisterInfo:: getFrameRegister(const MachineFunction &MF) const { - return hasFP(MF) ? Mips::FP : Mips::SP; + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); + bool IsN64 = Subtarget.isABI_N64(); + + return TFI->hasFP(MF) ? (IsN64 ? Mips::FP_64 : Mips::FP) : + (IsN64 ? Mips::SP_64 : Mips::SP); } unsigned MipsRegisterInfo:: getEHExceptionRegister() const { llvm_unreachable("What is the exception register"); - return 0; } unsigned MipsRegisterInfo:: getEHHandlerRegister() const { llvm_unreachable("What is the exception handler register"); - return 0; } - -int MipsRegisterInfo:: -getDwarfRegNum(unsigned RegNum, bool isEH) const { - llvm_unreachable("What is the dwarf register number"); - return -1; -} - -#include "MipsGenRegisterInfo.inc" -