for (MachineBasicBlock::reverse_iterator I = MBB->rbegin(), E = MBB->rend();
I != E; ++I) {
- // Update liveness, including the current instrucion's defs.
+ // Update liveness, including the current instruction's defs.
LiveUnits.stepBackward(*I, *TRI);
if (UndefMI == &*I) {