In some cases it is possible to port existing VMX code directly. If the VMX code is highly generic (makes few assumptions about the execution environment) the translation can be relatively straightforward. The two processors specify a different binary code format, so recompilation is required at a minimum. Even where instructions exist with the same behaviors, they do not have the same instruction names, so this must be mapped as well. IBM provides compiler intrinsics which take care of this mapping transparently as part of the development toolkit.