// MOV NewBase, Base
// ADDS NewBase, #imm8.
if (Base != NewBase && Offset >= 8) {
+ const ARMSubtarget &Subtarget = MBB.getParent()->getTarget()
+ .getSubtarget<ARMSubtarget>();
// Need to insert a MOV to the new base first.
- BuildMI(MBB, MBBI, dl, TII->get(ARM::tMOVr), NewBase)
- .addReg(Base, getKillRegState(BaseKill))
- .addImm(Pred).addReg(PredReg);
+ if (isARMLowRegister(NewBase) && isARMLowRegister(Base) &&
+ !Subtarget.hasV6Ops()) {
+ // thumbv4t doesn't have lo->lo copies, and we can't predicate tMOVSr
+ if (Pred != ARMCC::AL)
+ return false;
+ BuildMI(MBB, MBBI, dl, TII->get(ARM::tMOVSr), NewBase)
+ .addReg(Base, getKillRegState(BaseKill));
+ } else
+ BuildMI(MBB, MBBI, dl, TII->get(ARM::tMOVr), NewBase)
+ .addReg(Base, getKillRegState(BaseKill))
+ .addImm(Pred).addReg(PredReg);
+
// Set up BaseKill and Base correctly to insert the ADDS/SUBS below.
Base = NewBase;
BaseKill = false;