-//===- MipsRegisterInfo.cpp - MIPS Register Information -== -----*- C++ -*-===//
+//===-- MipsRegisterInfo.cpp - MIPS Register Information -== --------------===//
//
// The LLVM Compiler Infrastructure
//
#define DEBUG_TYPE "mips-reg-info"
+#include "MipsRegisterInfo.h"
#include "Mips.h"
+#include "MipsAnalyzeImmediate.h"
+#include "MipsInstrInfo.h"
#include "MipsSubtarget.h"
-#include "MipsRegisterInfo.h"
#include "MipsMachineFunction.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#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"
#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
-{
- // 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
- };
-
+const uint16_t* MipsRegisterInfo::
+getCalleeSavedRegs(const MachineFunction *MF) const {
if (Subtarget.isSingleFloat())
- return SingleFloatOnlyCalleeSavedRegs;
- else
- return BitMode32CalleeSavedRegs;
+ 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;
}
-/// 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
- };
-
- 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
- };
-
+const uint32_t*
+MipsRegisterInfo::getCallPreservedMask(CallingConv::ID) const {
if (Subtarget.isSingleFloat())
- return SingleFloatOnlyCalleeSavedRC;
- else
- return BitMode32CalleeSavedRC;
+ 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;
}
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;
-}
-
-//===----------------------------------------------------------------------===//
-//
-// 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.
-//
-//===----------------------------------------------------------------------===//
-
-void MipsRegisterInfo::adjustMipsStackFrame(MachineFunction &MF) const
-{
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
- const std::vector<CalleeSavedInfo> &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);
- }
+getReservedRegs(const MachineFunction &MF) const {
+ static const uint16_t ReservedCPURegs[] = {
+ Mips::ZERO, Mips::AT, Mips::K0, Mips::K1,
+ Mips::SP, Mips::RA
+ };
- // 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());
- }
+ static const uint16_t ReservedCPU64Regs[] = {
+ Mips::ZERO_64, Mips::AT_64, Mips::K0_64, Mips::K1_64,
+ Mips::SP_64, Mips::RA_64
+ };
- // 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->hasCalls()) {
- // 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->hasCalls())
- TopCPUSavedRegOff += RegSize;
+ BitVector Reserved(getNumRegs());
+ typedef TargetRegisterClass::const_iterator RegIter;
+
+ for (unsigned I = 0; I < array_lengthof(ReservedCPURegs); ++I)
+ Reserved.set(ReservedCPURegs[I]);
+
+ if (Subtarget.hasMips64()) {
+ for (unsigned I = 0; I < array_lengthof(ReservedCPU64Regs); ++I)
+ Reserved.set(ReservedCPU64Regs[I]);
+
+ // Reserve all registers in AFGR64.
+ for (RegIter Reg = Mips::AFGR64RegClass.begin(),
+ EReg = Mips::AFGR64RegClass.end(); Reg != EReg; ++Reg)
+ Reserved.set(*Reg);
+ } else {
+ // Reserve all registers in CPU64Regs & FGR64.
+ for (RegIter Reg = Mips::CPU64RegsRegClass.begin(),
+ EReg = Mips::CPU64RegsRegClass.end(); Reg != EReg; ++Reg)
+ Reserved.set(*Reg);
+
+ for (RegIter Reg = Mips::FGR64RegClass.begin(),
+ EReg = Mips::FGR64RegClass.end(); Reg != EReg; ++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());
+ // Reserve FP if this function should have a dedicated frame pointer register.
+ if (MF.getTarget().getFrameLowering()->hasFP(MF)) {
+ Reserved.set(Mips::FP);
+ Reserved.set(Mips::FP_64);
}
- StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign);
- // Update frame info
- MFI->setStackSize(StackOffset);
+ // Reserve hardware registers.
+ Reserved.set(Mips::HWR29);
+ Reserved.set(Mips::HWR29_64);
- // 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);
+ return Reserved;
+}
- if (TopFPUSavedRegOff >= 0)
- MipsFI->setFPUTopSavedRegOff(TopFPUSavedRegOff-StackOffset);
+bool
+MipsRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
+ return true;
}
-// 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 NoFramePointerElim || MFI->hasVarSizedObjects();
+bool
+MipsRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
+ return true;
}
-// This function eliminate ADJCALLSTACKDOWN,
+// This function eliminate ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void MipsRegisterInfo::
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<MipsFunctionInfo>();
unsigned i = 0;
while (!MI.getOperand(i).isFI()) {
++i;
- assert(i < MI.getNumOperands() &&
+ assert(i < MI.getNumOperands() &&
"Instr doesn't have FrameIndex operand!");
}
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<MipsFunctionInfo>();
- 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->hasCalls()) 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->hasCalls()) {
- 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<CalleeSavedInfo> &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->isDynAllocFI(FrameIndex) ||
+ MipsFI->isGlobalRegFI(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<MipsFunctionInfo>();
- 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->hasCalls()) {
- 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();
+ unsigned ADDu = Subtarget.isABI_N64() ? Mips::DADDu : Mips::ADDu;
+ unsigned ATReg = Subtarget.isABI_N64() ? Mips::AT_64 : Mips::AT;
+ MipsAnalyzeImmediate::Inst LastInst(0, 0);
+
+ MipsFI->setEmitNOAT();
+ Mips::loadImmediate(Offset, Subtarget.isABI_N64(), TII, MBB, II, DL, true,
+ &LastInst);
+ BuildMI(MBB, II, DL, TII.get(ADDu), ATReg).addReg(FrameReg).addReg(ATReg);
+
+ FrameReg = ATReg;
+ Offset = SignExtend64<16>(LastInst.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<MipsFunctionInfo>();
- 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"
-
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