#include "ARM.h"
#include "ARMAddressingModes.h"
+#include "ARMBaseInstrInfo.h"
#include "ARMBaseRegisterInfo.h"
#include "ARMInstrInfo.h"
#include "ARMMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
}
}
-ARMBaseRegisterInfo::ARMBaseRegisterInfo(const TargetInstrInfo &tii,
+ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
const ARMSubtarget &sti)
: ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
TII(tii), STI(sti),
FramePtr((STI.isTargetDarwin() || STI.isThumb()) ? ARM::R7 : ARM::R11) {
}
+unsigned ARMBaseRegisterInfo::
+getOpcode(int Op) const {
+ return TII.getOpcode((ARMII::Op)Op);
+}
+
const unsigned*
ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
static const unsigned CalleeSavedRegs[] = {
return 0;
}
+
+static inline
+const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
+ return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
+}
+
+static inline
+const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
+ return MIB.addReg(0);
+}
+
+/// emitLoadConstPool - Emits a load from constpool to materialize the
+/// specified immediate.
+void ARMBaseRegisterInfo::
+emitLoadConstPool(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ DebugLoc dl,
+ unsigned DestReg, int Val,
+ ARMCC::CondCodes Pred,
+ unsigned PredReg) const {
+ MachineFunction &MF = *MBB.getParent();
+ MachineConstantPool *ConstantPool = MF.getConstantPool();
+ Constant *C = ConstantInt::get(Type::Int32Ty, Val);
+ unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
+
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::LDRcp), DestReg)
+ .addConstantPoolIndex(Idx)
+ .addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
+}
+
+bool ARMBaseRegisterInfo::
+requiresRegisterScavenging(const MachineFunction &MF) const {
+ return true;
+}
+
+// hasReservedCallFrame - Under normal circumstances, when a frame pointer is
+// not required, we reserve argument space for call sites in the function
+// immediately on entry to the current function. This eliminates the need for
+// add/sub sp brackets around call sites. Returns true if the call frame is
+// included as part of the stack frame.
+bool ARMBaseRegisterInfo::
+hasReservedCallFrame(MachineFunction &MF) const {
+ const MachineFrameInfo *FFI = MF.getFrameInfo();
+ unsigned CFSize = FFI->getMaxCallFrameSize();
+ // It's not always a good idea to include the call frame as part of the
+ // stack frame. ARM (especially Thumb) has small immediate offset to
+ // address the stack frame. So a large call frame can cause poor codegen
+ // and may even makes it impossible to scavenge a register.
+ if (CFSize >= ((1 << 12) - 1) / 2) // Half of imm12
+ return false;
+
+ return !MF.getFrameInfo()->hasVarSizedObjects();
+}
+
+/// emitARMRegPlusImmediate - Emits a series of instructions to materialize
+/// a destreg = basereg + immediate in ARM code.
+static
+void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned DestReg, unsigned BaseReg, int NumBytes,
+ ARMCC::CondCodes Pred, unsigned PredReg,
+ const ARMBaseInstrInfo &TII,
+ DebugLoc dl) {
+ bool isSub = NumBytes < 0;
+ if (isSub) NumBytes = -NumBytes;
+
+ while (NumBytes) {
+ unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
+ unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
+ assert(ThisVal && "Didn't extract field correctly");
+
+ // We will handle these bits from offset, clear them.
+ NumBytes &= ~ThisVal;
+
+ // Get the properly encoded SOImmVal field.
+ int SOImmVal = ARM_AM::getSOImmVal(ThisVal);
+ assert(SOImmVal != -1 && "Bit extraction didn't work?");
+
+ // Build the new ADD / SUB.
+ BuildMI(MBB, MBBI, dl, TII.get(TII.getOpcode(isSub ? ARMII::SUBri : ARMII::ADDri)), DestReg)
+ .addReg(BaseReg, RegState::Kill).addImm(SOImmVal)
+ .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
+ BaseReg = DestReg;
+ }
+}
+
+static void
+emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
+ const ARMBaseInstrInfo &TII, DebugLoc dl,
+ int NumBytes,
+ ARMCC::CondCodes Pred = ARMCC::AL, unsigned PredReg = 0) {
+ emitARMRegPlusImmediate(MBB, MBBI, ARM::SP, ARM::SP, NumBytes,
+ Pred, PredReg, TII, dl);
+}
+
+void ARMBaseRegisterInfo::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ if (!hasReservedCallFrame(MF)) {
+ // If we have alloca, convert as follows:
+ // ADJCALLSTACKDOWN -> sub, sp, sp, amount
+ // ADJCALLSTACKUP -> add, sp, sp, amount
+ MachineInstr *Old = I;
+ DebugLoc dl = Old->getDebugLoc();
+ unsigned Amount = Old->getOperand(0).getImm();
+ if (Amount != 0) {
+ // We need to keep the stack aligned properly. To do this, we round the
+ // amount of space needed for the outgoing arguments up to the next
+ // alignment boundary.
+ unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
+ Amount = (Amount+Align-1)/Align*Align;
+
+ // Replace the pseudo instruction with a new instruction...
+ unsigned Opc = Old->getOpcode();
+ ARMCC::CondCodes Pred = (ARMCC::CondCodes)Old->getOperand(1).getImm();
+ if (Opc == ARM::ADJCALLSTACKDOWN || Opc == ARM::tADJCALLSTACKDOWN) {
+ // Note: PredReg is operand 2 for ADJCALLSTACKDOWN.
+ unsigned PredReg = Old->getOperand(2).getReg();
+ emitSPUpdate(MBB, I, TII, dl, -Amount, Pred, PredReg);
+ } else {
+ // Note: PredReg is operand 3 for ADJCALLSTACKUP.
+ unsigned PredReg = Old->getOperand(3).getReg();
+ assert(Opc == ARM::ADJCALLSTACKUP || Opc == ARM::tADJCALLSTACKUP);
+ emitSPUpdate(MBB, I, TII, dl, Amount, Pred, PredReg);
+ }
+ }
+ }
+ MBB.erase(I);
+}
+
+/// findScratchRegister - Find a 'free' ARM register. If register scavenger
+/// is not being used, R12 is available. Otherwise, try for a call-clobbered
+/// register first and then a spilled callee-saved register if that fails.
+static
+unsigned findScratchRegister(RegScavenger *RS, const TargetRegisterClass *RC,
+ ARMFunctionInfo *AFI) {
+ unsigned Reg = RS ? RS->FindUnusedReg(RC, true) : (unsigned) ARM::R12;
+ assert (!AFI->isThumbFunction());
+ if (Reg == 0)
+ // Try a already spilled CS register.
+ Reg = RS->FindUnusedReg(RC, AFI->getSpilledCSRegisters());
+
+ return Reg;
+}
+
+void ARMBaseRegisterInfo::
+eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, RegScavenger *RS) const{
+ unsigned i = 0;
+ MachineInstr &MI = *II;
+ MachineBasicBlock &MBB = *MI.getParent();
+ MachineFunction &MF = *MBB.getParent();
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ DebugLoc dl = MI.getDebugLoc();
+
+ while (!MI.getOperand(i).isFI()) {
+ ++i;
+ assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
+ }
+
+ unsigned FrameReg = ARM::SP;
+ int FrameIndex = MI.getOperand(i).getIndex();
+ int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
+ MF.getFrameInfo()->getStackSize() + SPAdj;
+
+ if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
+ Offset -= AFI->getGPRCalleeSavedArea1Offset();
+ else if (AFI->isGPRCalleeSavedArea2Frame(FrameIndex))
+ Offset -= AFI->getGPRCalleeSavedArea2Offset();
+ else if (AFI->isDPRCalleeSavedAreaFrame(FrameIndex))
+ Offset -= AFI->getDPRCalleeSavedAreaOffset();
+ else if (hasFP(MF)) {
+ assert(SPAdj == 0 && "Unexpected");
+ // There is alloca()'s in this function, must reference off the frame
+ // pointer instead.
+ FrameReg = getFrameRegister(MF);
+ Offset -= AFI->getFramePtrSpillOffset();
+ }
+
+ unsigned Opcode = MI.getOpcode();
+ const TargetInstrDesc &Desc = MI.getDesc();
+ unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
+ bool isSub = false;
+
+ // Memory operands in inline assembly always use AddrMode2.
+ if (Opcode == ARM::INLINEASM)
+ AddrMode = ARMII::AddrMode2;
+
+ if (Opcode == getOpcode(ARMII::ADDri)) {
+ Offset += MI.getOperand(i+1).getImm();
+ if (Offset == 0) {
+ // Turn it into a move.
+ MI.setDesc(TII.get(getOpcode(ARMII::MOVr)));
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ MI.RemoveOperand(i+1);
+ return;
+ } else if (Offset < 0) {
+ Offset = -Offset;
+ isSub = true;
+ MI.setDesc(TII.get(getOpcode(ARMII::SUBri)));
+ }
+
+ // Common case: small offset, fits into instruction.
+ int ImmedOffset = ARM_AM::getSOImmVal(Offset);
+ if (ImmedOffset != -1) {
+ // Replace the FrameIndex with sp / fp
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ MI.getOperand(i+1).ChangeToImmediate(ImmedOffset);
+ return;
+ }
+
+ // Otherwise, we fallback to common code below to form the imm offset with
+ // a sequence of ADDri instructions. First though, pull as much of the imm
+ // into this ADDri as possible.
+ unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
+ unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
+
+ // We will handle these bits from offset, clear them.
+ Offset &= ~ThisImmVal;
+
+ // Get the properly encoded SOImmVal field.
+ int ThisSOImmVal = ARM_AM::getSOImmVal(ThisImmVal);
+ assert(ThisSOImmVal != -1 && "Bit extraction didn't work?");
+ MI.getOperand(i+1).ChangeToImmediate(ThisSOImmVal);
+ } else {
+ unsigned ImmIdx = 0;
+ int InstrOffs = 0;
+ unsigned NumBits = 0;
+ unsigned Scale = 1;
+ switch (AddrMode) {
+ case ARMII::AddrMode2: {
+ ImmIdx = i+2;
+ InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
+ if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
+ InstrOffs *= -1;
+ NumBits = 12;
+ break;
+ }
+ case ARMII::AddrMode3: {
+ ImmIdx = i+2;
+ InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
+ if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
+ InstrOffs *= -1;
+ NumBits = 8;
+ break;
+ }
+ case ARMII::AddrMode5: {
+ ImmIdx = i+1;
+ InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
+ if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
+ InstrOffs *= -1;
+ NumBits = 8;
+ Scale = 4;
+ break;
+ }
+ default:
+ LLVM_UNREACHABLE("Unsupported addressing mode!");
+ break;
+ }
+
+ Offset += InstrOffs * Scale;
+ assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
+ if (Offset < 0) {
+ Offset = -Offset;
+ isSub = true;
+ }
+
+ // Common case: small offset, fits into instruction.
+ MachineOperand &ImmOp = MI.getOperand(ImmIdx);
+ int ImmedOffset = Offset / Scale;
+ unsigned Mask = (1 << NumBits) - 1;
+ if ((unsigned)Offset <= Mask * Scale) {
+ // Replace the FrameIndex with sp
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ if (isSub)
+ ImmedOffset |= 1 << NumBits;
+ ImmOp.ChangeToImmediate(ImmedOffset);
+ return;
+ }
+
+ // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
+ ImmedOffset = ImmedOffset & Mask;
+ if (isSub)
+ ImmedOffset |= 1 << NumBits;
+ ImmOp.ChangeToImmediate(ImmedOffset);
+ Offset &= ~(Mask*Scale);
+ }
+
+ // If we get here, the immediate doesn't fit into the instruction. We folded
+ // as much as possible above, handle the rest, providing a register that is
+ // SP+LargeImm.
+ assert(Offset && "This code isn't needed if offset already handled!");
+
+ // Insert a set of r12 with the full address: r12 = sp + offset
+ // If the offset we have is too large to fit into the instruction, we need
+ // to form it with a series of ADDri's. Do this by taking 8-bit chunks
+ // out of 'Offset'.
+ unsigned ScratchReg = findScratchRegister(RS, &ARM::GPRRegClass, AFI);
+ if (ScratchReg == 0)
+ // No register is "free". Scavenge a register.
+ ScratchReg = RS->scavengeRegister(&ARM::GPRRegClass, II, SPAdj);
+ int PIdx = MI.findFirstPredOperandIdx();
+ ARMCC::CondCodes Pred = (PIdx == -1)
+ ? ARMCC::AL : (ARMCC::CondCodes)MI.getOperand(PIdx).getImm();
+ unsigned PredReg = (PIdx == -1) ? 0 : MI.getOperand(PIdx+1).getReg();
+ emitARMRegPlusImmediate(MBB, II, ScratchReg, FrameReg,
+ isSub ? -Offset : Offset, Pred, PredReg, TII, dl);
+ MI.getOperand(i).ChangeToRegister(ScratchReg, false, false, true);
+}
+
+/// Move iterator pass the next bunch of callee save load / store ops for
+/// the particular spill area (1: integer area 1, 2: integer area 2,
+/// 3: fp area, 0: don't care).
+static void movePastCSLoadStoreOps(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ int Opc, unsigned Area,
+ const ARMSubtarget &STI) {
+ while (MBBI != MBB.end() &&
+ MBBI->getOpcode() == Opc && MBBI->getOperand(1).isFI()) {
+ if (Area != 0) {
+ bool Done = false;
+ unsigned Category = 0;
+ switch (MBBI->getOperand(0).getReg()) {
+ case ARM::R4: case ARM::R5: case ARM::R6: case ARM::R7:
+ case ARM::LR:
+ Category = 1;
+ break;
+ case ARM::R8: case ARM::R9: case ARM::R10: case ARM::R11:
+ Category = STI.isTargetDarwin() ? 2 : 1;
+ break;
+ case ARM::D8: case ARM::D9: case ARM::D10: case ARM::D11:
+ case ARM::D12: case ARM::D13: case ARM::D14: case ARM::D15:
+ Category = 3;
+ break;
+ default:
+ Done = true;
+ break;
+ }
+ if (Done || Category != Area)
+ break;
+ }
+
+ ++MBBI;
+ }
+}
+
+void ARMBaseRegisterInfo::
+emitPrologue(MachineFunction &MF) const {
+ MachineBasicBlock &MBB = MF.front();
+ MachineBasicBlock::iterator MBBI = MBB.begin();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned NumBytes = MFI->getStackSize();
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+ DebugLoc dl = (MBBI != MBB.end() ?
+ MBBI->getDebugLoc() : DebugLoc::getUnknownLoc());
+
+ // Determine the sizes of each callee-save spill areas and record which frame
+ // belongs to which callee-save spill areas.
+ unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
+ int FramePtrSpillFI = 0;
+
+ if (VARegSaveSize)
+ emitSPUpdate(MBB, MBBI, TII, dl, -VARegSaveSize);
+
+ if (!AFI->hasStackFrame()) {
+ if (NumBytes != 0)
+ emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
+ return;
+ }
+
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+ unsigned Reg = CSI[i].getReg();
+ int FI = CSI[i].getFrameIdx();
+ switch (Reg) {
+ case ARM::R4:
+ case ARM::R5:
+ case ARM::R6:
+ case ARM::R7:
+ case ARM::LR:
+ if (Reg == FramePtr)
+ FramePtrSpillFI = FI;
+ AFI->addGPRCalleeSavedArea1Frame(FI);
+ GPRCS1Size += 4;
+ break;
+ case ARM::R8:
+ case ARM::R9:
+ case ARM::R10:
+ case ARM::R11:
+ if (Reg == FramePtr)
+ FramePtrSpillFI = FI;
+ if (STI.isTargetDarwin()) {
+ AFI->addGPRCalleeSavedArea2Frame(FI);
+ GPRCS2Size += 4;
+ } else {
+ AFI->addGPRCalleeSavedArea1Frame(FI);
+ GPRCS1Size += 4;
+ }
+ break;
+ default:
+ AFI->addDPRCalleeSavedAreaFrame(FI);
+ DPRCSSize += 8;
+ }
+ }
+
+ // Build the new SUBri to adjust SP for integer callee-save spill area 1.
+ emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS1Size);
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 1, STI);
+
+ // Darwin ABI requires FP to point to the stack slot that contains the
+ // previous FP.
+ if (STI.isTargetDarwin() || hasFP(MF)) {
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::ADDri)), FramePtr)
+ .addFrameIndex(FramePtrSpillFI).addImm(0);
+ AddDefaultCC(AddDefaultPred(MIB));
+ }
+
+ // Build the new SUBri to adjust SP for integer callee-save spill area 2.
+ emitSPUpdate(MBB, MBBI, TII, dl, -GPRCS2Size);
+
+ // Build the new SUBri to adjust SP for FP callee-save spill area.
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::STR), 2, STI);
+ emitSPUpdate(MBB, MBBI, TII, dl, -DPRCSSize);
+
+ // Determine starting offsets of spill areas.
+ unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
+ unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
+ unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
+ AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
+ AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
+ AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
+ AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
+
+ NumBytes = DPRCSOffset;
+ if (NumBytes) {
+ // Insert it after all the callee-save spills.
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FSTD), 3, STI);
+ emitSPUpdate(MBB, MBBI, TII, dl, -NumBytes);
+ }
+
+ if (STI.isTargetELF() && hasFP(MF)) {
+ MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
+ AFI->getFramePtrSpillOffset());
+ }
+
+ AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
+ AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
+ AFI->setDPRCalleeSavedAreaSize(DPRCSSize);
+}
+
+static bool isCalleeSavedRegister(unsigned Reg, const unsigned *CSRegs) {
+ for (unsigned i = 0; CSRegs[i]; ++i)
+ if (Reg == CSRegs[i])
+ return true;
+ return false;
+}
+
+static bool isCSRestore(MachineInstr *MI,
+ const ARMBaseInstrInfo &TII,
+ const unsigned *CSRegs) {
+ return ((MI->getOpcode() == (int)TII.getOpcode(ARMII::FLDD) ||
+ MI->getOpcode() == (int)TII.getOpcode(ARMII::LDR)) &&
+ MI->getOperand(1).isFI() &&
+ isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs));
+}
+
+void ARMBaseRegisterInfo::
+emitEpilogue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const {
+ MachineBasicBlock::iterator MBBI = prior(MBB.end());
+ assert(MBBI->getOpcode() == (int)getOpcode(ARMII::BX_RET) &&
+ "Can only insert epilog into returning blocks");
+ DebugLoc dl = MBBI->getDebugLoc();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ int NumBytes = (int)MFI->getStackSize();
+
+ if (!AFI->hasStackFrame()) {
+ if (NumBytes != 0)
+ emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
+ } else {
+ // Unwind MBBI to point to first LDR / FLDD.
+ const unsigned *CSRegs = getCalleeSavedRegs();
+ if (MBBI != MBB.begin()) {
+ do
+ --MBBI;
+ while (MBBI != MBB.begin() && isCSRestore(MBBI, TII, CSRegs));
+ if (!isCSRestore(MBBI, TII, CSRegs))
+ ++MBBI;
+ }
+
+ // Move SP to start of FP callee save spill area.
+ NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
+ AFI->getGPRCalleeSavedArea2Size() +
+ AFI->getDPRCalleeSavedAreaSize());
+
+ // Darwin ABI requires FP to point to the stack slot that contains the
+ // previous FP.
+ if ((STI.isTargetDarwin() && NumBytes) || hasFP(MF)) {
+ NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
+ // Reset SP based on frame pointer only if the stack frame extends beyond
+ // frame pointer stack slot or target is ELF and the function has FP.
+ if (AFI->getGPRCalleeSavedArea2Size() ||
+ AFI->getDPRCalleeSavedAreaSize() ||
+ AFI->getDPRCalleeSavedAreaOffset()||
+ hasFP(MF)) {
+ if (NumBytes)
+ BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::SUBri)), ARM::SP).addReg(FramePtr)
+ .addImm(NumBytes)
+ .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
+ else
+ BuildMI(MBB, MBBI, dl, TII.get(getOpcode(ARMII::MOVr)), ARM::SP).addReg(FramePtr)
+ .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
+ }
+ } else if (NumBytes) {
+ emitSPUpdate(MBB, MBBI, TII, dl, NumBytes);
+ }
+
+ // Move SP to start of integer callee save spill area 2.
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::FLDD), 3, STI);
+ emitSPUpdate(MBB, MBBI, TII, dl, AFI->getDPRCalleeSavedAreaSize());
+
+ // Move SP to start of integer callee save spill area 1.
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 2, STI);
+ emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea2Size());
+
+ // Move SP to SP upon entry to the function.
+ movePastCSLoadStoreOps(MBB, MBBI, getOpcode(ARMII::LDR), 1, STI);
+ emitSPUpdate(MBB, MBBI, TII, dl, AFI->getGPRCalleeSavedArea1Size());
+ }
+
+ if (VARegSaveSize)
+ emitSPUpdate(MBB, MBBI, TII, dl, VARegSaveSize);
+
+}
+
#include "ARMGenRegisterInfo.inc"
projects / oota-llvm.git / blobdiff