- const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
- int MinCSFI = 0;
- int MaxCSFI = -1;
-
- if (CSI.size()) {
- MinCSFI = CSI[0].getFrameIdx();
- MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
- }
-
- // 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;
-
- Offset += MI.getOperand(i+1).getImm();
-
- DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
-
- // 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);
- }
-
- MI.getOperand(i).ChangeToRegister(FrameReg, false);
- MI.getOperand(i+1).ChangeToImmediate(Offset);