- MFI->setObjectOffset(MFI->CreateStackObject(4,4), FPOffset);
- MFI->setObjectOffset(MFI->CreateStackObject(4,4), RAOffset);
- MipsFI->setFPStackOffset(FPOffset);
- MipsFI->setRAStackOffset(RAOffset);
-
- // Align stack.
- unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
- NumBytes = ((NumBytes+Align-1)/Align*Align);
-
- #ifndef NDEBUG
- DOUT << "FPOffset :" << FPOffset << "\n";
- DOUT << "RAOffset :" << RAOffset << "\n";
- DOUT << "New stack size :" << NumBytes << "\n\n";
- #endif
-
- // Update frame info
- MFI->setStackSize(NumBytes);
-
- // PIC speficic function prologue
- if (isPIC)
- BuildMI(MBB, MBBI, TII.get(Mips::CPLOAD)).addReg(Mips::T9);
-
- // Adjust stack : addi sp, sp, (-imm)
- BuildMI(MBB, MBBI, TII.get(Mips::ADDiu), Mips::SP)
- .addReg(Mips::SP).addImm(-NumBytes);
-
- // Save the return address only if the function isnt a leaf one.
- // sw $ra, stack_loc($sp)
- if (MFI->hasCalls()) {
- BuildMI(MBB, MBBI, 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, TII.get(Mips::SW))
- .addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP);
-
- // move $fp, $sp
- BuildMI(MBB, MBBI, TII.get(Mips::ADDu), Mips::FP)
- .addReg(Mips::SP).addReg(Mips::ZERO);
- }
-
- // PIC speficic function prologue
- if ((isPIC) && (MFI->hasCalls()))
- BuildMI(MBB, MBBI, TII.get(Mips::CPRESTORE))
- .addImm(MipsFI->getGPStackOffset());
-}
-
-void MipsRegisterInfo::
-emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
-{
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
-
- // 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, TII.get(Mips::ADDu), Mips::SP)
- .addReg(Mips::FP).addReg(Mips::ZERO);
-
- // lw $fp,stack_loc($sp)
- BuildMI(MBB, MBBI, TII.get(Mips::LW))
- .addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP);
- }
-
- // Restore the return address only if the function isnt a leaf one.
- // lw $ra, stack_loc($sp)
- if (MFI->hasCalls()) {
- BuildMI(MBB, MBBI, TII.get(Mips::LW))
- .addReg(Mips::RA).addImm(RAOffset).addReg(Mips::SP);
- }
-
- // adjust stack : insert addi sp, sp, (imm)
- if (NumBytes) {
- BuildMI(MBB, MBBI, TII.get(Mips::ADDiu), Mips::SP)
- .addReg(Mips::SP).addImm(NumBytes);
+ // 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 = 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.
+ int Offset;
+
+ if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) ||
+ MipsFI->isDynAllocFI(FrameIndex))
+ Offset = spOffset;
+ else
+ Offset = spOffset + 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() && (Offset >= 0x8000 || Offset < -0x8000)) {
+ MachineBasicBlock &MBB = *MI.getParent();
+ DebugLoc DL = II->getDebugLoc();
+ int ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) +
+ ((Offset & 0x8000) != 0);
+
+ // FIXME: change this when mips goes MC".
+ BuildMI(MBB, II, DL, TII.get(Mips::NOAT));
+ BuildMI(MBB, II, DL, TII.get(Mips::LUi), Mips::AT).addImm(ImmHi);
+ BuildMI(MBB, II, DL, TII.get(Mips::ADDu), Mips::AT).addReg(FrameReg)
+ .addReg(Mips::AT);
+ FrameReg = Mips::AT;
+ Offset = (short)(Offset & 0xffff);
+
+ BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO));