"Prefer `xor a` instead of `ld a, 0`" is basically the first optimization that you learn when doing SM83 assembly. https://github.com/pret/pokecrystal/wiki/Opt

"Prefer `xor a` instead of `ld a, 0`" is basically the first optimization that you learn when doing SM83 assembly. https://github.com/pret/pokecrystal/wiki/Optimizing-assembly-code#set-a-to-0 https://github.com/pret/pokecrystal/wiki/Optimizing-assembly...