Optimisations

[momoladebrouill]

1. Functions re-defined
   I placed the definitions of the functions out of the loop so that it's doesn't get re-defined at each instruction.
2. No more ip+=1 everywhere
   I've remove the ip+=1 and placed at the end of the loop so that's it's written once. To avoid the addr error, i've set it to addr-1 so when ip+=1 comes, ip is well set to addr-1+1 == addr