Further optimize the inner loop
Further optimize the inner loop

Groestlcoin/electrumx-grs,Crowndev/electrumx,shsmith/electrumx,erasmospunk/electrumx,shsmith/electrumx,Crowndev/electrumx,thelazier/electrumx,erasmospunk/electrumx,Groestlcoin/electrumx-grs,bauerj/electrumx,bauerj/electrumx,thelazier/electrumx