+static void replaceFI(MachineFunction &MF,
+ MachineBasicBlock::iterator II,
+ MachineInstr &MI,
+ DebugLoc dl,
+ unsigned FIOperandNum, int Offset,
+ unsigned FramePtr)
+{
+ // Replace frame index with a frame pointer reference.
+ if (Offset >= -4096 && Offset <= 4095) {
+ // If the offset is small enough to fit in the immediate field, directly
+ // encode it.
+ MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
+ MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
+ return;
+ }
+
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
+
+ // FIXME: it would be better to scavenge a register here instead of
+ // reserving G1 all of the time.
+ if (Offset >= 0) {
+ // Emit nonnegaive immediates with sethi + or.
+ // sethi %hi(Offset), %g1
+ // add %g1, %fp, %g1
+ // Insert G1+%lo(offset) into the user.
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1)
+ .addImm(HI22(Offset));
+
+
+ // Emit G1 = G1 + I6
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
+ .addReg(FramePtr);
+ // Insert: G1+%lo(offset) into the user.
+ MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
+ MI.getOperand(FIOperandNum + 1).ChangeToImmediate(LO10(Offset));
+ return;
+ }
+
+ // Emit Negative numbers with sethi + xor
+ // sethi %hix(Offset), %g1
+ // xor %g1, %lox(offset), %g1
+ // add %g1, %fp, %g1
+ // Insert: G1 + 0 into the user.
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1)
+ .addImm(HIX22(Offset));
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::XORri), SP::G1)
+ .addReg(SP::G1).addImm(LOX10(Offset));
+
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
+ .addReg(FramePtr);
+ // Insert: G1+%lo(offset) into the user.
+ MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
+ MI.getOperand(FIOperandNum + 1).ChangeToImmediate(0);
+}
+
+