cl::desc("Reserve application registers (%g2-%g4)"));
SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st)
- : SparcGenRegisterInfo(SP::I7), Subtarget(st) {
+ : SparcGenRegisterInfo(SP::O7), Subtarget(st) {
}
const uint16_t* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
// encode it.
MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
- } else {
- // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to
- // scavenge a register here instead of reserving G1 all of the time.
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
- unsigned OffHi = (unsigned)Offset >> 10U;
- BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
+ return;
+ }
+
+ const TargetInstrInfo &TII = *MF.getTarget().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(Offset & ((1 << 10)-1));
+ 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);
}